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This commit is contained in:
Edward Capriolo
2015-01-17 18:15:40 -05:00
parent a96ae21269
commit 6d70b28e82
17 changed files with 1307 additions and 1307 deletions
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298
src/main/java/com/google/code/gossip/GossipMember.java
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@ -1,149 +1,149 @@
package com.google.code.gossip; package com.google.code.gossip;
import java.net.InetSocketAddress; import java.net.InetSocketAddress;
import org.json.JSONException; import org.json.JSONException;
import org.json.JSONObject; import org.json.JSONObject;
/** /**
* A abstract class representing a gossip member. * A abstract class representing a gossip member.
* *
* @author joshclemm, harmenw * @author joshclemm, harmenw
*/ */
public abstract class GossipMember { public abstract class GossipMember {
/** The JSON key for the host property. */ /** The JSON key for the host property. */
public static final String JSON_HOST = "host"; public static final String JSON_HOST = "host";
/** The JSON key for the port property. */ /** The JSON key for the port property. */
public static final String JSON_PORT = "port"; public static final String JSON_PORT = "port";
/** The JSON key for the heartbeat property. */ /** The JSON key for the heartbeat property. */
public static final String JSON_HEARTBEAT = "heartbeat"; public static final String JSON_HEARTBEAT = "heartbeat";
public static final String JSON_ID = "id"; public static final String JSON_ID = "id";
/** The hostname or IP address of this gossip member. */ /** The hostname or IP address of this gossip member. */
protected String _host; protected String _host;
/** The port number of this gossip member. */ /** The port number of this gossip member. */
protected int _port; protected int _port;
/** The current heartbeat of this gossip member. */ /** The current heartbeat of this gossip member. */
protected int _heartbeat; protected int _heartbeat;
protected String _id; protected String _id;
/** /**
* Constructor. * Constructor.
* @param host The hostname or IP address. * @param host The hostname or IP address.
* @param port The port number. * @param port The port number.
* @param heartbeat The current heartbeat. * @param heartbeat The current heartbeat.
*/ */
public GossipMember(String host, int port, String id, int heartbeat) { public GossipMember(String host, int port, String id, int heartbeat) {
_host = host; _host = host;
_port = port; _port = port;
_id = id; _id = id;
_heartbeat = heartbeat; _heartbeat = heartbeat;
} }
/** /**
* Get the hostname or IP address of the remote gossip member. * Get the hostname or IP address of the remote gossip member.
* @return The hostname or IP address. * @return The hostname or IP address.
*/ */
public String getHost() { public String getHost() {
return _host; return _host;
} }
/** /**
* Get the port number of the remote gossip member. * Get the port number of the remote gossip member.
* @return The port number. * @return The port number.
*/ */
public int getPort() { public int getPort() {
return _port; return _port;
} }
/** /**
* The member address in the form IP/host:port * The member address in the form IP/host:port
* Similar to the toString in {@link InetSocketAddress} * Similar to the toString in {@link InetSocketAddress}
*/ */
public String getAddress() { public String getAddress() {
return _host+":"+_port; return _host+":"+_port;
} }
/** /**
* Get the heartbeat of this gossip member. * Get the heartbeat of this gossip member.
* @return The current heartbeat. * @return The current heartbeat.
*/ */
public int getHeartbeat() { public int getHeartbeat() {
return _heartbeat; return _heartbeat;
} }
/** /**
* Set the heartbeat of this gossip member. * Set the heartbeat of this gossip member.
* @param heartbeat The new heartbeat. * @param heartbeat The new heartbeat.
*/ */
public void setHeartbeat(int heartbeat) { public void setHeartbeat(int heartbeat) {
this._heartbeat = heartbeat; this._heartbeat = heartbeat;
} }
public String getId() { public String getId() {
return _id; return _id;
} }
public void setId(String _id) { public void setId(String _id) {
this._id = _id; this._id = _id;
} }
public String toString() { public String toString() {
return "Member [address=" + getAddress() + ", id=" + _id + ", heartbeat=" + _heartbeat + "]"; return "Member [address=" + getAddress() + ", id=" + _id + ", heartbeat=" + _heartbeat + "]";
} }
/** /**
* @see java.lang.Object#hashCode() * @see java.lang.Object#hashCode()
*/ */
@Override @Override
public int hashCode() { public int hashCode() {
final int prime = 31; final int prime = 31;
int result = 1; int result = 1;
String address = getAddress(); String address = getAddress();
result = prime * result result = prime * result
+ ((address == null) ? 0 : address.hashCode()); + ((address == null) ? 0 : address.hashCode());
return result; return result;
} }
/** /**
* @see java.lang.Object#equals(java.lang.Object) * @see java.lang.Object#equals(java.lang.Object)
*/ */
@Override @Override
public boolean equals(Object obj) { public boolean equals(Object obj) {
if (this == obj) { if (this == obj) {
return true; return true;
} }
if (obj == null) { if (obj == null) {
System.err.println("equals(): obj is null."); System.err.println("equals(): obj is null.");
return false; return false;
} }
if (! (obj instanceof GossipMember) ) { if (! (obj instanceof GossipMember) ) {
System.err.println("equals(): obj is not of type GossipMember."); System.err.println("equals(): obj is not of type GossipMember.");
return false; return false;
} }
// The object is the same of they both have the same address (hostname and port). // The object is the same of they both have the same address (hostname and port).
return getAddress().equals(((LocalGossipMember) obj).getAddress()); return getAddress().equals(((LocalGossipMember) obj).getAddress());
} }
/** /**
* Get the JSONObject which is the JSON representation of this GossipMember. * Get the JSONObject which is the JSON representation of this GossipMember.
* @return The JSONObject of this GossipMember. * @return The JSONObject of this GossipMember.
*/ */
public JSONObject toJSONObject() { public JSONObject toJSONObject() {
try { try {
JSONObject jsonObject = new JSONObject(); JSONObject jsonObject = new JSONObject();
jsonObject.put(JSON_HOST, _host); jsonObject.put(JSON_HOST, _host);
jsonObject.put(JSON_PORT, _port); jsonObject.put(JSON_PORT, _port);
jsonObject.put(JSON_ID, _id); jsonObject.put(JSON_ID, _id);
jsonObject.put(JSON_HEARTBEAT, _heartbeat); jsonObject.put(JSON_HEARTBEAT, _heartbeat);
return jsonObject; return jsonObject;
} catch (JSONException e) { } catch (JSONException e) {
throw new RuntimeException(e); throw new RuntimeException(e);
} }
} }
} }

92
src/main/java/com/google/code/gossip/GossipRunner.java
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@ -1,46 +1,46 @@
package com.google.code.gossip; package com.google.code.gossip;
import java.io.File; import java.io.File;
import java.io.FileNotFoundException; import java.io.FileNotFoundException;
import java.io.IOException; import java.io.IOException;
import org.json.JSONException; import org.json.JSONException;
public class GossipRunner { public class GossipRunner {
private StartupSettings _settings; private StartupSettings _settings;
public static void main(String[] args) { public static void main(String[] args) {
File configFile; File configFile;
if (args.length == 1) { if (args.length == 1) {
configFile = new File("./"+args[0]); configFile = new File("./"+args[0]);
} else { } else {
configFile = new File("gossip.conf"); configFile = new File("gossip.conf");
} }
new GossipRunner(configFile); new GossipRunner(configFile);
} }
public GossipRunner(File configFile) { public GossipRunner(File configFile) {
if (configFile != null && configFile.exists()) { if (configFile != null && configFile.exists()) {
try { try {
System.out.println("Parsing the configuration file..."); System.out.println("Parsing the configuration file...");
_settings = StartupSettings.fromJSONFile(configFile); _settings = StartupSettings.fromJSONFile(configFile);
GossipService gossipService = new GossipService(_settings); GossipService gossipService = new GossipService(_settings);
System.out.println("Gossip service successfully inialized, let's start it..."); System.out.println("Gossip service successfully inialized, let's start it...");
gossipService.start(); gossipService.start();
} catch (FileNotFoundException e) { } catch (FileNotFoundException e) {
System.err.println("The given file is not found!"); System.err.println("The given file is not found!");
} catch (JSONException e) { } catch (JSONException e) {
System.err.println("The given file is not in the correct JSON format!"); System.err.println("The given file is not in the correct JSON format!");
} catch (IOException e) { } catch (IOException e) {
System.err.println("Could not read the configuration file: " + e.getMessage()); System.err.println("Could not read the configuration file: " + e.getMessage());
} catch (InterruptedException e) { } catch (InterruptedException e) {
System.err.println("Error while starting the gossip service: " + e.getMessage()); System.err.println("Error while starting the gossip service: " + e.getMessage());
} }
} else { } else {
System.out.println("The gossip.conf file is not found.\n\nEither specify the path to the startup settings file or place the gossip.json file in the same folder as the JAR file."); System.out.println("The gossip.conf file is not found.\n\nEither specify the path to the startup settings file or place the gossip.json file in the same folder as the JAR file.");
} }
} }
} }

116
src/main/java/com/google/code/gossip/GossipService.java
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@ -1,58 +1,58 @@
package com.google.code.gossip; package com.google.code.gossip;
import java.net.InetAddress; import java.net.InetAddress;
import java.net.SocketException; import java.net.SocketException;
import java.net.UnknownHostException; import java.net.UnknownHostException;
import java.util.ArrayList; import java.util.ArrayList;
import org.apache.log4j.Logger; import org.apache.log4j.Logger;
import com.google.code.gossip.manager.GossipManager; import com.google.code.gossip.manager.GossipManager;
import com.google.code.gossip.manager.random.RandomGossipManager; import com.google.code.gossip.manager.random.RandomGossipManager;
/** /**
* This object represents the service which is responsible for gossiping with other gossip members. * This object represents the service which is responsible for gossiping with other gossip members.
* *
* @author joshclemm, harmenw * @author joshclemm, harmenw
*/ */
public class GossipService { public class GossipService {
public static final Logger LOGGER = Logger.getLogger(GossipService.class); public static final Logger LOGGER = Logger.getLogger(GossipService.class);
private GossipManager _gossipManager; private GossipManager _gossipManager;
/** /**
* Constructor with the default settings. * Constructor with the default settings.
* @throws InterruptedException * @throws InterruptedException
* @throws UnknownHostException * @throws UnknownHostException
*/ */
public GossipService(StartupSettings startupSettings) throws InterruptedException, UnknownHostException { public GossipService(StartupSettings startupSettings) throws InterruptedException, UnknownHostException {
this(InetAddress.getLocalHost().getHostAddress(), startupSettings.getPort(), "", startupSettings.getLogLevel(), startupSettings.getGossipMembers(), startupSettings.getGossipSettings()); this(InetAddress.getLocalHost().getHostAddress(), startupSettings.getPort(), "", startupSettings.getLogLevel(), startupSettings.getGossipMembers(), startupSettings.getGossipSettings());
} }
/** /**
* Setup the client's lists, gossiping parameters, and parse the startup config file. * Setup the client's lists, gossiping parameters, and parse the startup config file.
* @throws SocketException * @throws SocketException
* @throws InterruptedException * @throws InterruptedException
* @throws UnknownHostException * @throws UnknownHostException
*/ */
public GossipService(String ipAddress, int port, String id, int logLevel, ArrayList<GossipMember> gossipMembers, GossipSettings settings) throws InterruptedException, UnknownHostException { public GossipService(String ipAddress, int port, String id, int logLevel, ArrayList<GossipMember> gossipMembers, GossipSettings settings) throws InterruptedException, UnknownHostException {
_gossipManager = new RandomGossipManager(ipAddress, port, id, settings, gossipMembers); _gossipManager = new RandomGossipManager(ipAddress, port, id, settings, gossipMembers);
} }
public void start() { public void start() {
_gossipManager.start(); _gossipManager.start();
} }
public void shutdown() { public void shutdown() {
_gossipManager.shutdown(); _gossipManager.shutdown();
} }
public GossipManager get_gossipManager() { public GossipManager get_gossipManager() {
return _gossipManager; return _gossipManager;
} }
public void set_gossipManager(GossipManager _gossipManager) { public void set_gossipManager(GossipManager _gossipManager) {
this._gossipManager = _gossipManager; this._gossipManager = _gossipManager;
} }
} }

128
src/main/java/com/google/code/gossip/GossipSettings.java
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@ -1,64 +1,64 @@
package com.google.code.gossip; package com.google.code.gossip;
/** /**
* In this object the settings used by the GossipService are held. * In this object the settings used by the GossipService are held.
* *
* @author harmenw * @author harmenw
*/ */
public class GossipSettings { public class GossipSettings {
/** Time between gossip'ing in ms. Default is 1 second. */ /** Time between gossip'ing in ms. Default is 1 second. */
private int _gossipInterval = 1000; private int _gossipInterval = 1000;
/** Time between cleanups in ms. Default is 10 seconds. */ /** Time between cleanups in ms. Default is 10 seconds. */
private int _cleanupInterval = 10000; private int _cleanupInterval = 10000;
/** /**
* Construct GossipSettings with default settings. * Construct GossipSettings with default settings.
*/ */
public GossipSettings() {} public GossipSettings() {}
/** /**
* Construct GossipSettings with given settings. * Construct GossipSettings with given settings.
* @param gossipInterval The gossip interval in ms. * @param gossipInterval The gossip interval in ms.
* @param cleanupInterval The cleanup interval in ms. * @param cleanupInterval The cleanup interval in ms.
*/ */
public GossipSettings(int gossipInterval, int cleanupInterval) { public GossipSettings(int gossipInterval, int cleanupInterval) {
_gossipInterval = gossipInterval; _gossipInterval = gossipInterval;
_cleanupInterval = cleanupInterval; _cleanupInterval = cleanupInterval;
} }
/** /**
* Set the gossip interval. * Set the gossip interval.
* This is the time between a gossip message is send. * This is the time between a gossip message is send.
* @param gossipInterval The gossip interval in ms. * @param gossipInterval The gossip interval in ms.
*/ */
public void setGossipTimeout(int gossipInterval) { public void setGossipTimeout(int gossipInterval) {
_gossipInterval = gossipInterval; _gossipInterval = gossipInterval;
} }
/** /**
* Set the cleanup interval. * Set the cleanup interval.
* This is the time between the last heartbeat received from a member and when it will be marked as dead. * This is the time between the last heartbeat received from a member and when it will be marked as dead.
* @param cleanupInterval The cleanup interval in ms. * @param cleanupInterval The cleanup interval in ms.
*/ */
public void setCleanupInterval(int cleanupInterval) { public void setCleanupInterval(int cleanupInterval) {
_cleanupInterval = cleanupInterval; _cleanupInterval = cleanupInterval;
} }
/** /**
* Get the gossip interval. * Get the gossip interval.
* @return The gossip interval in ms. * @return The gossip interval in ms.
*/ */
public int getGossipInterval() { public int getGossipInterval() {
return _gossipInterval; return _gossipInterval;
} }
/** /**
* Get the clean interval. * Get the clean interval.
* @return The cleanup interval. * @return The cleanup interval.
*/ */
public int getCleanupInterval() { public int getCleanupInterval() {
return _cleanupInterval; return _cleanupInterval;
} }
} }

122
src/main/java/com/google/code/gossip/GossipTimeoutTimer.java
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@ -1,61 +1,61 @@
package com.google.code.gossip; package com.google.code.gossip;
import java.util.Date; import java.util.Date;
import javax.management.NotificationListener; import javax.management.NotificationListener;
import javax.management.timer.Timer; import javax.management.timer.Timer;
/** /**
* This object represents a timer for a gossip member. * This object represents a timer for a gossip member.
* When the timer has elapsed without being reset in the meantime, it will inform the GossipService about this * When the timer has elapsed without being reset in the meantime, it will inform the GossipService about this
* who in turn will put the gossip member on the dead list, because it is apparantly not alive anymore. * who in turn will put the gossip member on the dead list, because it is apparantly not alive anymore.
* *
* @author joshclemm, harmenw * @author joshclemm, harmenw
*/ */
public class GossipTimeoutTimer extends Timer { public class GossipTimeoutTimer extends Timer {
/** The amount of time this timer waits before generating a wake-up event. */ /** The amount of time this timer waits before generating a wake-up event. */
private long _sleepTime; private long _sleepTime;
/** The gossip member this timer is for. */ /** The gossip member this timer is for. */
private LocalGossipMember _source; private LocalGossipMember _source;
/** /**
* Constructor. * Constructor.
* Creates a reset-able timer that wakes up after millisecondsSleepTime. * Creates a reset-able timer that wakes up after millisecondsSleepTime.
* @param millisecondsSleepTime The time for this timer to wait before an event. * @param millisecondsSleepTime The time for this timer to wait before an event.
* @param service * @param service
* @param member * @param member
*/ */
public GossipTimeoutTimer(long millisecondsSleepTime, NotificationListener notificationListener, LocalGossipMember member) { public GossipTimeoutTimer(long millisecondsSleepTime, NotificationListener notificationListener, LocalGossipMember member) {
super(); super();
_sleepTime = millisecondsSleepTime; _sleepTime = millisecondsSleepTime;
_source = member; _source = member;
addNotificationListener(notificationListener, null, null); addNotificationListener(notificationListener, null, null);
} }
/** /**
* @see javax.management.timer.Timer#start() * @see javax.management.timer.Timer#start()
*/ */
public void start() { public void start() {
this.reset(); this.reset();
super.start(); super.start();
} }
/** /**
* Resets timer to start counting down from original time. * Resets timer to start counting down from original time.
*/ */
public void reset() { public void reset() {
removeAllNotifications(); removeAllNotifications();
setWakeupTime(_sleepTime); setWakeupTime(_sleepTime);
} }
/** /**
* Adds a new wake-up time for this timer. * Adds a new wake-up time for this timer.
* @param milliseconds * @param milliseconds
*/ */
private void setWakeupTime(long milliseconds) { private void setWakeupTime(long milliseconds) {
addNotification("type", "message", _source, new Date(System.currentTimeMillis()+milliseconds)); addNotification("type", "message", _source, new Date(System.currentTimeMillis()+milliseconds));
} }
} }

84
src/main/java/com/google/code/gossip/LocalGossipMember.java
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@ -1,42 +1,42 @@
package com.google.code.gossip; package com.google.code.gossip;
import javax.management.NotificationListener; import javax.management.NotificationListener;
/** /**
* This object represent a gossip member with the properties known locally. * This object represent a gossip member with the properties known locally.
* These objects are stored in the local list of gossip member.s * These objects are stored in the local list of gossip member.s
* *
* @author harmenw * @author harmenw
*/ */
public class LocalGossipMember extends GossipMember { public class LocalGossipMember extends GossipMember {
/** The timeout timer for this gossip member. */ /** The timeout timer for this gossip member. */
private transient GossipTimeoutTimer timeoutTimer; private transient GossipTimeoutTimer timeoutTimer;
/** /**
* Constructor. * Constructor.
* @param host The hostname or IP address. * @param host The hostname or IP address.
* @param port The port number. * @param port The port number.
* @param heartbeat The current heartbeat. * @param heartbeat The current heartbeat.
* @param gossipService The GossipService object. * @param gossipService The GossipService object.
* @param cleanupTimeout The cleanup timeout for this gossip member. * @param cleanupTimeout The cleanup timeout for this gossip member.
*/ */
public LocalGossipMember(String hostname, int port, String id, int heartbeat, NotificationListener notificationListener, int cleanupTimeout) { public LocalGossipMember(String hostname, int port, String id, int heartbeat, NotificationListener notificationListener, int cleanupTimeout) {
super(hostname, port, id, heartbeat); super(hostname, port, id, heartbeat);
this.timeoutTimer = new GossipTimeoutTimer(cleanupTimeout, notificationListener, this); this.timeoutTimer = new GossipTimeoutTimer(cleanupTimeout, notificationListener, this);
} }
/** /**
* Start the timeout timer. * Start the timeout timer.
*/ */
public void startTimeoutTimer() { public void startTimeoutTimer() {
this.timeoutTimer.start(); this.timeoutTimer.start();
} }
/** /**
* Reset the timeout timer. * Reset the timeout timer.
*/ */
public void resetTimeoutTimer() { public void resetTimeoutTimer() {
this.timeoutTimer.reset(); this.timeoutTimer.reset();
} }
} }

50
src/main/java/com/google/code/gossip/LogLevel.java
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@ -1,25 +1,25 @@
package com.google.code.gossip; package com.google.code.gossip;
public class LogLevel { public class LogLevel {
public static final String CONFIG_ERROR = "ERROR"; public static final String CONFIG_ERROR = "ERROR";
public static final String CONFIG_INFO = "INFO"; public static final String CONFIG_INFO = "INFO";
public static final String CONFIG_DEBUG = "DEBUG"; public static final String CONFIG_DEBUG = "DEBUG";
public static final int ERROR = 1; public static final int ERROR = 1;
public static final int INFO = 2; public static final int INFO = 2;
public static final int DEBUG = 3; public static final int DEBUG = 3;
public static int fromString(String logLevel) { public static int fromString(String logLevel) {
if (logLevel.equals(CONFIG_ERROR)) if (logLevel.equals(CONFIG_ERROR))
return ERROR; return ERROR;
else if (logLevel.equals(CONFIG_INFO)) else if (logLevel.equals(CONFIG_INFO))
return INFO; return INFO;
else if (logLevel.equals(CONFIG_DEBUG)) else if (logLevel.equals(CONFIG_DEBUG))
return DEBUG; return DEBUG;
else else
return INFO; return INFO;
} }
} }

56
src/main/java/com/google/code/gossip/RemoteGossipMember.java
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@ -1,28 +1,28 @@
package com.google.code.gossip; package com.google.code.gossip;
/** /**
* The object represents a gossip member with the properties as received from a remote gossip member. * The object represents a gossip member with the properties as received from a remote gossip member.
* *
* @author harmenw * @author harmenw
*/ */
public class RemoteGossipMember extends GossipMember { public class RemoteGossipMember extends GossipMember {
/** /**
* Constructor. * Constructor.
* @param host The hostname or IP address. * @param host The hostname or IP address.
* @param port The port number. * @param port The port number.
* @param heartbeat The current heartbeat. * @param heartbeat The current heartbeat.
*/ */
public RemoteGossipMember(String hostname, int port, String id, int heartbeat) { public RemoteGossipMember(String hostname, int port, String id, int heartbeat) {
super(hostname, port, id, heartbeat); super(hostname, port, id, heartbeat);
} }
/** /**
* Construct a RemoteGossipMember with a heartbeat of 0. * Construct a RemoteGossipMember with a heartbeat of 0.
* @param host The hostname or IP address. * @param host The hostname or IP address.
* @param port The port number. * @param port The port number.
*/ */
public RemoteGossipMember(String hostname, int port, String id) { public RemoteGossipMember(String hostname, int port, String id) {
super(hostname, port, id, 0); super(hostname, port, id, 0);
} }
} }

322
src/main/java/com/google/code/gossip/StartupSettings.java
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@ -1,161 +1,161 @@
package com.google.code.gossip; package com.google.code.gossip;
import java.io.BufferedReader; import java.io.BufferedReader;
import java.io.File; import java.io.File;
import java.io.FileNotFoundException; import java.io.FileNotFoundException;
import java.io.FileReader; import java.io.FileReader;
import java.io.IOException; import java.io.IOException;
import java.util.ArrayList; import java.util.ArrayList;
import org.json.JSONArray; import org.json.JSONArray;
import org.json.JSONException; import org.json.JSONException;
import org.json.JSONObject; import org.json.JSONObject;
/** /**
* This object represents the settings used when starting the gossip service. * This object represents the settings used when starting the gossip service.
* *
* @author harmenw * @author harmenw
*/ */
public class StartupSettings { public class StartupSettings {
/** The port to start the gossip service on. */ /** The port to start the gossip service on. */
private int _port; private int _port;
/** The logging level of the gossip service. */ /** The logging level of the gossip service. */
private int _logLevel; private int _logLevel;
/** The gossip settings used at startup. */ /** The gossip settings used at startup. */
private GossipSettings _gossipSettings; private GossipSettings _gossipSettings;
/** The list with gossip members to start with. */ /** The list with gossip members to start with. */
private ArrayList<GossipMember> _gossipMembers; private ArrayList<GossipMember> _gossipMembers;
/** /**
* Constructor. * Constructor.
* @param port The port to start the service on. * @param port The port to start the service on.
*/ */
public StartupSettings(int port, int logLevel) { public StartupSettings(int port, int logLevel) {
this(port, logLevel, new GossipSettings()); this(port, logLevel, new GossipSettings());
} }
/** /**
* Constructor. * Constructor.
* @param port The port to start the service on. * @param port The port to start the service on.
*/ */
public StartupSettings(int port, int logLevel, GossipSettings gossipSettings) { public StartupSettings(int port, int logLevel, GossipSettings gossipSettings) {
_port = port; _port = port;
_logLevel = logLevel; _logLevel = logLevel;
_gossipSettings = gossipSettings; _gossipSettings = gossipSettings;
_gossipMembers = new ArrayList<GossipMember>(); _gossipMembers = new ArrayList<GossipMember>();
} }
/** /**
* Set the port of the gossip service. * Set the port of the gossip service.
* @param port The port for the gossip service. * @param port The port for the gossip service.
*/ */
public void setPort(int port) { public void setPort(int port) {
_port = port; _port = port;
} }
/** /**
* Get the port for the gossip service. * Get the port for the gossip service.
* @return The port of the gossip service. * @return The port of the gossip service.
*/ */
public int getPort() { public int getPort() {
return _port; return _port;
} }
/** /**
* Set the log level of the gossip service. * Set the log level of the gossip service.
* @param logLevel The log level({LogLevel}). * @param logLevel The log level({LogLevel}).
*/ */
public void setLogLevel(int logLevel) { public void setLogLevel(int logLevel) {
_logLevel = logLevel; _logLevel = logLevel;
} }
/** /**
* Get the log level of the gossip service. * Get the log level of the gossip service.
* @return The log level. * @return The log level.
*/ */
public int getLogLevel() { public int getLogLevel() {
return _logLevel; return _logLevel;
} }
/** /**
* Get the GossipSettings. * Get the GossipSettings.
* @return The GossipSettings object. * @return The GossipSettings object.
*/ */
public GossipSettings getGossipSettings() { public GossipSettings getGossipSettings() {
return _gossipSettings; return _gossipSettings;
} }
/** /**
* Add a gossip member to the list of members to start with. * Add a gossip member to the list of members to start with.
* @param member The member to add. * @param member The member to add.
*/ */
public void addGossipMember(GossipMember member) { public void addGossipMember(GossipMember member) {
_gossipMembers.add(member); _gossipMembers.add(member);
} }
/** /**
* Get the list with gossip members. * Get the list with gossip members.
* @return The gossip members. * @return The gossip members.
*/ */
public ArrayList<GossipMember> getGossipMembers() { public ArrayList<GossipMember> getGossipMembers() {
return _gossipMembers; return _gossipMembers;
} }
/** /**
* Parse the settings for the gossip service from a JSON file. * Parse the settings for the gossip service from a JSON file.
* @param jsonFile The file object which refers to the JSON config file. * @param jsonFile The file object which refers to the JSON config file.
* @return The StartupSettings object with the settings from the config file. * @return The StartupSettings object with the settings from the config file.
* @throws JSONException Thrown when the file is not well-formed JSON. * @throws JSONException Thrown when the file is not well-formed JSON.
* @throws FileNotFoundException Thrown when the file cannot be found. * @throws FileNotFoundException Thrown when the file cannot be found.
* @throws IOException Thrown when reading the file gives problems. * @throws IOException Thrown when reading the file gives problems.
*/ */
public static StartupSettings fromJSONFile(File jsonFile) throws JSONException, FileNotFoundException, IOException { public static StartupSettings fromJSONFile(File jsonFile) throws JSONException, FileNotFoundException, IOException {
// Read the file to a String. // Read the file to a String.
BufferedReader br = new BufferedReader(new FileReader(jsonFile)); BufferedReader br = new BufferedReader(new FileReader(jsonFile));
StringBuffer buffer = new StringBuffer(); StringBuffer buffer = new StringBuffer();
String line; String line;
while((line = br.readLine()) != null) { while((line = br.readLine()) != null) {
buffer.append(line.trim()); buffer.append(line.trim());
} }
// Lets parse the String as JSON. // Lets parse the String as JSON.
JSONObject jsonObject = new JSONArray(buffer.toString()).getJSONObject(0); JSONObject jsonObject = new JSONArray(buffer.toString()).getJSONObject(0);
// Now get the port number. // Now get the port number.
int port = jsonObject.getInt("port"); int port = jsonObject.getInt("port");
// Get the log level from the config file. // Get the log level from the config file.
int logLevel = LogLevel.fromString(jsonObject.getString("log_level")); int logLevel = LogLevel.fromString(jsonObject.getString("log_level"));
// Get the gossip_interval from the config file. // Get the gossip_interval from the config file.
int gossipInterval = jsonObject.getInt("gossip_interval"); int gossipInterval = jsonObject.getInt("gossip_interval");
// Get the cleanup_interval from the config file. // Get the cleanup_interval from the config file.
int cleanupInterval = jsonObject.getInt("cleanup_interval"); int cleanupInterval = jsonObject.getInt("cleanup_interval");
System.out.println("Config [port: " + port + ", log_level: " + logLevel + ", gossip_interval: " + gossipInterval + ", cleanup_interval: " + cleanupInterval + "]"); System.out.println("Config [port: " + port + ", log_level: " + logLevel + ", gossip_interval: " + gossipInterval + ", cleanup_interval: " + cleanupInterval + "]");
// Initiate the settings with the port number. // Initiate the settings with the port number.
StartupSettings settings = new StartupSettings(port, logLevel, new GossipSettings(gossipInterval, cleanupInterval)); StartupSettings settings = new StartupSettings(port, logLevel, new GossipSettings(gossipInterval, cleanupInterval));
// Now iterate over the members from the config file and add them to the settings. // Now iterate over the members from the config file and add them to the settings.
System.out.print("Config-members ["); System.out.print("Config-members [");
JSONArray membersJSON = jsonObject.getJSONArray("members"); JSONArray membersJSON = jsonObject.getJSONArray("members");
for (int i=0; i<membersJSON.length(); i++) { for (int i=0; i<membersJSON.length(); i++) {
JSONObject memberJSON = membersJSON.getJSONObject(i); JSONObject memberJSON = membersJSON.getJSONObject(i);
RemoteGossipMember member = new RemoteGossipMember(memberJSON.getString("host"), memberJSON.getInt("port"), ""); RemoteGossipMember member = new RemoteGossipMember(memberJSON.getString("host"), memberJSON.getInt("port"), "");
settings.addGossipMember(member); settings.addGossipMember(member);
System.out.print(member.getAddress()); System.out.print(member.getAddress());
if (i < (membersJSON.length() - 1)) if (i < (membersJSON.length() - 1))
System.out.print(", "); System.out.print(", ");
} }
System.out.println("]"); System.out.println("]");
// Return the created settings object. // Return the created settings object.
return settings; return settings;
} }
} }

156
src/main/java/com/google/code/gossip/examples/GossipExample.java
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@ -1,78 +1,78 @@
package com.google.code.gossip.examples; package com.google.code.gossip.examples;
import java.net.InetAddress; import java.net.InetAddress;
import java.net.UnknownHostException; import java.net.UnknownHostException;
import java.util.ArrayList; import java.util.ArrayList;
import com.google.code.gossip.GossipMember; import com.google.code.gossip.GossipMember;
import com.google.code.gossip.GossipService; import com.google.code.gossip.GossipService;
import com.google.code.gossip.GossipSettings; import com.google.code.gossip.GossipSettings;
import com.google.code.gossip.LogLevel; import com.google.code.gossip.LogLevel;
import com.google.code.gossip.RemoteGossipMember; import com.google.code.gossip.RemoteGossipMember;
/** /**
* This class is an example of how one could use the gossip service. * This class is an example of how one could use the gossip service.
* Here we start multiple gossip clients on this host as specified in the config file. * Here we start multiple gossip clients on this host as specified in the config file.
* *
* @author harmenw * @author harmenw
*/ */
public class GossipExample extends Thread { public class GossipExample extends Thread {
/** The number of clients to start. */ /** The number of clients to start. */
private static final int NUMBER_OF_CLIENTS = 4; private static final int NUMBER_OF_CLIENTS = 4;
/** /**
* @param args * @param args
*/ */
public static void main(String[] args) { public static void main(String[] args) {
new GossipExample(); new GossipExample();
} }
/** /**
* Constructor. * Constructor.
* This will start the this thread. * This will start the this thread.
*/ */
public GossipExample() { public GossipExample() {
start(); start();
} }
/** /**
* @see java.lang.Thread#run() * @see java.lang.Thread#run()
*/ */
public void run() { public void run() {
try { try {
GossipSettings settings = new GossipSettings(); GossipSettings settings = new GossipSettings();
ArrayList<GossipService> clients = new ArrayList<GossipService>(); ArrayList<GossipService> clients = new ArrayList<GossipService>();
// Get my ip address. // Get my ip address.
String myIpAddress = InetAddress.getLocalHost().getHostAddress(); String myIpAddress = InetAddress.getLocalHost().getHostAddress();
// Create the gossip members and put them in a list and give them a port number starting with 2000. // Create the gossip members and put them in a list and give them a port number starting with 2000.
ArrayList<GossipMember> startupMembers = new ArrayList<GossipMember>(); ArrayList<GossipMember> startupMembers = new ArrayList<GossipMember>();
for (int i=0; i<NUMBER_OF_CLIENTS; ++i) { for (int i=0; i<NUMBER_OF_CLIENTS; ++i) {
startupMembers.add(new RemoteGossipMember(myIpAddress, 2000+i, "")); startupMembers.add(new RemoteGossipMember(myIpAddress, 2000+i, ""));
} }
// Lets start the gossip clients. // Lets start the gossip clients.
// Start the clients, waiting cleaning-interval + 1 second between them which will show the dead list handling. // Start the clients, waiting cleaning-interval + 1 second between them which will show the dead list handling.
for (GossipMember member : startupMembers) { for (GossipMember member : startupMembers) {
GossipService gossipService = new GossipService(myIpAddress, member.getPort(), "", LogLevel.DEBUG, startupMembers, settings); GossipService gossipService = new GossipService(myIpAddress, member.getPort(), "", LogLevel.DEBUG, startupMembers, settings);
clients.add(gossipService); clients.add(gossipService);
gossipService.start(); gossipService.start();
sleep(settings.getCleanupInterval() + 1000); sleep(settings.getCleanupInterval() + 1000);
} }
// After starting all gossip clients, first wait 10 seconds and then shut them down. // After starting all gossip clients, first wait 10 seconds and then shut them down.
sleep(10000); sleep(10000);
System.err.println("Going to shutdown all services..."); System.err.println("Going to shutdown all services...");
// Since they all run in the same virtual machine and share the same executor, if one is shutdown they will all stop. // Since they all run in the same virtual machine and share the same executor, if one is shutdown they will all stop.
clients.get(0).shutdown(); clients.get(0).shutdown();
} catch (UnknownHostException e) { } catch (UnknownHostException e) {
e.printStackTrace(); e.printStackTrace();
} catch (InterruptedException e) { } catch (InterruptedException e) {
e.printStackTrace(); e.printStackTrace();
} }
} }
} }

116
src/main/java/com/google/code/gossip/manager/ActiveGossipThread.java
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@ -1,58 +1,58 @@
package com.google.code.gossip.manager; package com.google.code.gossip.manager;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean; import java.util.concurrent.atomic.AtomicBoolean;
import com.google.code.gossip.GossipService; import com.google.code.gossip.GossipService;
import com.google.code.gossip.LocalGossipMember; import com.google.code.gossip.LocalGossipMember;
/** /**
* [The active thread: periodically send gossip request.] * [The active thread: periodically send gossip request.]
* The class handles gossiping the membership list. * The class handles gossiping the membership list.
* This information is important to maintaining a common * This information is important to maintaining a common
* state among all the nodes, and is important for detecting * state among all the nodes, and is important for detecting
* failures. * failures.
*/ */
abstract public class ActiveGossipThread implements Runnable { abstract public class ActiveGossipThread implements Runnable {
private GossipManager _gossipManager; private GossipManager _gossipManager;
private final AtomicBoolean _keepRunning; private final AtomicBoolean _keepRunning;
public ActiveGossipThread(GossipManager gossipManager) { public ActiveGossipThread(GossipManager gossipManager) {
_gossipManager = gossipManager; _gossipManager = gossipManager;
_keepRunning = new AtomicBoolean(true); _keepRunning = new AtomicBoolean(true);
} }
@Override @Override
public void run() { public void run() {
while(_keepRunning.get()) { while(_keepRunning.get()) {
try { try {
TimeUnit.MILLISECONDS.sleep(_gossipManager.getSettings().getGossipInterval()); TimeUnit.MILLISECONDS.sleep(_gossipManager.getSettings().getGossipInterval());
sendMembershipList(_gossipManager.getMyself(), _gossipManager.getMemberList()); sendMembershipList(_gossipManager.getMyself(), _gossipManager.getMemberList());
} catch (InterruptedException e) { } catch (InterruptedException e) {
GossipService.LOGGER.error(e); GossipService.LOGGER.error(e);
_keepRunning.set(false); _keepRunning.set(false);
} }
} }
shutdown(); shutdown();
} }
public void shutdown(){ public void shutdown(){
_keepRunning.set(false); _keepRunning.set(false);
} }
/** /**
* Performs the sending of the membership list, after we have * Performs the sending of the membership list, after we have
* incremented our own heartbeat. * incremented our own heartbeat.
*/ */
abstract protected void sendMembershipList(LocalGossipMember me, ArrayList<LocalGossipMember> memberList); abstract protected void sendMembershipList(LocalGossipMember me, ArrayList<LocalGossipMember> memberList);
/** /**
* Abstract method which should be implemented by a subclass. * Abstract method which should be implemented by a subclass.
* This method should return a member of the list to gossip with. * This method should return a member of the list to gossip with.
* @param memberList The list of members which are stored in the local list of members. * @param memberList The list of members which are stored in the local list of members.
* @return The chosen LocalGossipMember to gossip with. * @return The chosen LocalGossipMember to gossip with.
*/ */
abstract protected LocalGossipMember selectPartner(ArrayList<LocalGossipMember> memberList); abstract protected LocalGossipMember selectPartner(ArrayList<LocalGossipMember> memberList);
} }

314
src/main/java/com/google/code/gossip/manager/GossipManager.java
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@ -1,157 +1,157 @@
package com.google.code.gossip.manager; package com.google.code.gossip.manager;
import java.lang.reflect.InvocationTargetException; import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.concurrent.ExecutorService; import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors; import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean; import java.util.concurrent.atomic.AtomicBoolean;
import javax.management.Notification; import javax.management.Notification;
import javax.management.NotificationListener; import javax.management.NotificationListener;
import com.google.code.gossip.GossipMember; import com.google.code.gossip.GossipMember;
import com.google.code.gossip.GossipService; import com.google.code.gossip.GossipService;
import com.google.code.gossip.GossipSettings; import com.google.code.gossip.GossipSettings;
import com.google.code.gossip.LocalGossipMember; import com.google.code.gossip.LocalGossipMember;
public abstract class GossipManager extends Thread implements NotificationListener { public abstract class GossipManager extends Thread implements NotificationListener {
/** The maximal number of bytes the packet with the GOSSIP may be. (Default is 100 kb) */ /** The maximal number of bytes the packet with the GOSSIP may be. (Default is 100 kb) */
public static final int MAX_PACKET_SIZE = 102400; public static final int MAX_PACKET_SIZE = 102400;
/** The list of members which are in the gossip group (not including myself). */ /** The list of members which are in the gossip group (not including myself). */
private ArrayList<LocalGossipMember> _memberList; private ArrayList<LocalGossipMember> _memberList;
/** The list of members which are known to be dead. */ /** The list of members which are known to be dead. */
private ArrayList<LocalGossipMember> _deadList; private ArrayList<LocalGossipMember> _deadList;
/** The member I am representing. */ /** The member I am representing. */
private LocalGossipMember _me; private LocalGossipMember _me;
/** The settings for gossiping. */ /** The settings for gossiping. */
private GossipSettings _settings; private GossipSettings _settings;
/** A boolean whether the gossip service should keep running. */ /** A boolean whether the gossip service should keep running. */
private AtomicBoolean _gossipServiceRunning; private AtomicBoolean _gossipServiceRunning;
/** A ExecutorService used for executing the active and passive gossip threads. */ /** A ExecutorService used for executing the active and passive gossip threads. */
private ExecutorService _gossipThreadExecutor; private ExecutorService _gossipThreadExecutor;
private Class<? extends PassiveGossipThread> _passiveGossipThreadClass; private Class<? extends PassiveGossipThread> _passiveGossipThreadClass;
private PassiveGossipThread passiveGossipThread; private PassiveGossipThread passiveGossipThread;
private Class<? extends ActiveGossipThread> _activeGossipThreadClass; private Class<? extends ActiveGossipThread> _activeGossipThreadClass;
private ActiveGossipThread activeGossipThread; private ActiveGossipThread activeGossipThread;
public GossipManager(Class<? extends PassiveGossipThread> passiveGossipThreadClass, public GossipManager(Class<? extends PassiveGossipThread> passiveGossipThreadClass,
Class<? extends ActiveGossipThread> activeGossipThreadClass, String address, int port, Class<? extends ActiveGossipThread> activeGossipThreadClass, String address, int port,
String id, GossipSettings settings, ArrayList<GossipMember> gossipMembers) { String id, GossipSettings settings, ArrayList<GossipMember> gossipMembers) {
_passiveGossipThreadClass = passiveGossipThreadClass; _passiveGossipThreadClass = passiveGossipThreadClass;
_activeGossipThreadClass = activeGossipThreadClass; _activeGossipThreadClass = activeGossipThreadClass;
_settings = settings; _settings = settings;
_me = new LocalGossipMember(address, port, id, 0, this, settings.getCleanupInterval()); _me = new LocalGossipMember(address, port, id, 0, this, settings.getCleanupInterval());
_memberList = new ArrayList<LocalGossipMember>(); _memberList = new ArrayList<LocalGossipMember>();
_deadList = new ArrayList<LocalGossipMember>(); _deadList = new ArrayList<LocalGossipMember>();
for (GossipMember startupMember : gossipMembers) { for (GossipMember startupMember : gossipMembers) {
if (!startupMember.equals(_me)) { if (!startupMember.equals(_me)) {
LocalGossipMember member = new LocalGossipMember(startupMember.getHost(), LocalGossipMember member = new LocalGossipMember(startupMember.getHost(),
startupMember.getPort(), startupMember.getId(), 0, this, startupMember.getPort(), startupMember.getId(), 0, this,
settings.getCleanupInterval()); settings.getCleanupInterval());
_memberList.add(member); _memberList.add(member);
GossipService.LOGGER.debug(member); GossipService.LOGGER.debug(member);
} }
} }
_gossipServiceRunning = new AtomicBoolean(true); _gossipServiceRunning = new AtomicBoolean(true);
Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() { Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
public void run() { public void run() {
GossipService.LOGGER.info("Service has been shutdown..."); GossipService.LOGGER.info("Service has been shutdown...");
} }
})); }));
} }
/** /**
* All timers associated with a member will trigger this method when it goes * All timers associated with a member will trigger this method when it goes
* off. The timer will go off if we have not heard from this member in * off. The timer will go off if we have not heard from this member in
* <code> _settings.T_CLEANUP </code> time. * <code> _settings.T_CLEANUP </code> time.
*/ */
@Override @Override
public void handleNotification(Notification notification, Object handback) { public void handleNotification(Notification notification, Object handback) {
LocalGossipMember deadMember = (LocalGossipMember) notification.getUserData(); LocalGossipMember deadMember = (LocalGossipMember) notification.getUserData();
GossipService.LOGGER.info("Dead member detected: " + deadMember); GossipService.LOGGER.info("Dead member detected: " + deadMember);
synchronized (this._memberList) { synchronized (this._memberList) {
this._memberList.remove(deadMember); this._memberList.remove(deadMember);
} }
synchronized (this._deadList) { synchronized (this._deadList) {
this._deadList.add(deadMember); this._deadList.add(deadMember);
} }
} }
public GossipSettings getSettings() { public GossipSettings getSettings() {
return _settings; return _settings;
} }
/** /**
* Get a clone of the memberlist. * Get a clone of the memberlist.
* @return * @return
*/ */
public ArrayList<LocalGossipMember> getMemberList() { public ArrayList<LocalGossipMember> getMemberList() {
return _memberList; return _memberList;
} }
public LocalGossipMember getMyself() { public LocalGossipMember getMyself() {
return _me; return _me;
} }
public ArrayList<LocalGossipMember> getDeadList() { public ArrayList<LocalGossipMember> getDeadList() {
return _deadList; return _deadList;
} }
/** /**
* Starts the client. Specifically, start the various cycles for this protocol. * Starts the client. Specifically, start the various cycles for this protocol.
* Start the gossip thread and start the receiver thread. * Start the gossip thread and start the receiver thread.
* @throws InterruptedException * @throws InterruptedException
*/ */
public void run() { public void run() {
for (LocalGossipMember member : _memberList) { for (LocalGossipMember member : _memberList) {
if (member != _me) { if (member != _me) {
member.startTimeoutTimer(); member.startTimeoutTimer();
} }
} }
_gossipThreadExecutor = Executors.newCachedThreadPool(); _gossipThreadExecutor = Executors.newCachedThreadPool();
try { try {
passiveGossipThread = _passiveGossipThreadClass.getConstructor(GossipManager.class).newInstance(this); passiveGossipThread = _passiveGossipThreadClass.getConstructor(GossipManager.class).newInstance(this);
_gossipThreadExecutor.execute(passiveGossipThread); _gossipThreadExecutor.execute(passiveGossipThread);
activeGossipThread = _activeGossipThreadClass.getConstructor(GossipManager.class).newInstance(this); activeGossipThread = _activeGossipThreadClass.getConstructor(GossipManager.class).newInstance(this);
_gossipThreadExecutor.execute(activeGossipThread); _gossipThreadExecutor.execute(activeGossipThread);
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException } catch (InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException | NoSuchMethodException | SecurityException e1) { | InvocationTargetException | NoSuchMethodException | SecurityException e1) {
throw new RuntimeException(e1); throw new RuntimeException(e1);
} }
GossipService.LOGGER.info("The GossipService is started."); GossipService.LOGGER.info("The GossipService is started.");
while(_gossipServiceRunning.get()) { while(_gossipServiceRunning.get()) {
try { try {
//TODO //TODO
TimeUnit.MILLISECONDS.sleep(1); TimeUnit.MILLISECONDS.sleep(1);
} catch (InterruptedException e) { } catch (InterruptedException e) {
GossipService.LOGGER.info("The GossipClient was interrupted."); GossipService.LOGGER.info("The GossipClient was interrupted.");
} }
} }
} }
/** /**
* Shutdown the gossip service. * Shutdown the gossip service.
*/ */
public void shutdown() { public void shutdown() {
_gossipThreadExecutor.shutdown(); _gossipThreadExecutor.shutdown();
passiveGossipThread.shutdown(); passiveGossipThread.shutdown();
activeGossipThread.shutdown(); activeGossipThread.shutdown();
try { try {
boolean result = _gossipThreadExecutor.awaitTermination(1000, TimeUnit.MILLISECONDS); boolean result = _gossipThreadExecutor.awaitTermination(1000, TimeUnit.MILLISECONDS);
System.err.println("Terminate retuned " + result); System.err.println("Terminate retuned " + result);
} catch (InterruptedException e) { } catch (InterruptedException e) {
e.printStackTrace(); e.printStackTrace();
} }
_gossipServiceRunning.set(false); _gossipServiceRunning.set(false);
} }
} }

282
src/main/java/com/google/code/gossip/manager/PassiveGossipThread.java
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@ -1,142 +1,142 @@
package com.google.code.gossip.manager; package com.google.code.gossip.manager;
import java.io.IOException; import java.io.IOException;
import java.net.DatagramPacket; import java.net.DatagramPacket;
import java.net.DatagramSocket; import java.net.DatagramSocket;
import java.net.InetSocketAddress; import java.net.InetSocketAddress;
import java.net.SocketAddress; import java.net.SocketAddress;
import java.net.SocketException; import java.net.SocketException;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean; import java.util.concurrent.atomic.AtomicBoolean;
import org.json.JSONArray; import org.json.JSONArray;
import org.json.JSONException; import org.json.JSONException;
import org.json.JSONObject; import org.json.JSONObject;
import com.google.code.gossip.GossipMember; import com.google.code.gossip.GossipMember;
import com.google.code.gossip.GossipService; import com.google.code.gossip.GossipService;
import com.google.code.gossip.RemoteGossipMember; import com.google.code.gossip.RemoteGossipMember;
/** /**
* [The passive thread: reply to incoming gossip request.] * [The passive thread: reply to incoming gossip request.]
* This class handles the passive cycle, where this client * This class handles the passive cycle, where this client
* has received an incoming message. For now, this message * has received an incoming message. For now, this message
* is always the membership list, but if you choose to gossip * is always the membership list, but if you choose to gossip
* additional information, you will need some logic to determine * additional information, you will need some logic to determine
* the incoming message. * the incoming message.
*/ */
abstract public class PassiveGossipThread implements Runnable { abstract public class PassiveGossipThread implements Runnable {
/** The socket used for the passive thread of the gossip service. */ /** The socket used for the passive thread of the gossip service. */
private DatagramSocket _server; private DatagramSocket _server;
private GossipManager _gossipManager; private GossipManager _gossipManager;
private AtomicBoolean _keepRunning; private AtomicBoolean _keepRunning;
public PassiveGossipThread(GossipManager gossipManager) { public PassiveGossipThread(GossipManager gossipManager) {
_gossipManager = gossipManager; _gossipManager = gossipManager;
try { try {
SocketAddress socketAddress = new InetSocketAddress(_gossipManager.getMyself().getHost(), _gossipManager.getMyself().getPort()); SocketAddress socketAddress = new InetSocketAddress(_gossipManager.getMyself().getHost(), _gossipManager.getMyself().getPort());
_server = new DatagramSocket(socketAddress); _server = new DatagramSocket(socketAddress);
GossipService.LOGGER.info("Gossip service successfully initialized on port " + _gossipManager.getMyself().getPort()); GossipService.LOGGER.info("Gossip service successfully initialized on port " + _gossipManager.getMyself().getPort());
GossipService.LOGGER.debug("I am " + _gossipManager.getMyself()); GossipService.LOGGER.debug("I am " + _gossipManager.getMyself());
} catch (SocketException ex) { } catch (SocketException ex) {
GossipService.LOGGER.error(ex); GossipService.LOGGER.error(ex);
_server = null; _server = null;
throw new RuntimeException(ex); throw new RuntimeException(ex);
} }
_keepRunning = new AtomicBoolean(true); _keepRunning = new AtomicBoolean(true);
} }
@Override @Override
public void run() { public void run() {
while (_keepRunning.get()) { while (_keepRunning.get()) {
try { try {
byte[] buf = new byte[_server.getReceiveBufferSize()]; byte[] buf = new byte[_server.getReceiveBufferSize()];
DatagramPacket p = new DatagramPacket(buf, buf.length); DatagramPacket p = new DatagramPacket(buf, buf.length);
_server.receive(p); _server.receive(p);
GossipService.LOGGER.debug("A message has been received from " + p.getAddress() + ":" GossipService.LOGGER.debug("A message has been received from " + p.getAddress() + ":"
+ p.getPort() + "."); + p.getPort() + ".");
int packet_length = 0; int packet_length = 0;
for (int i = 0; i < 4; i++) { for (int i = 0; i < 4; i++) {
int shift = (4 - 1 - i) * 8; int shift = (4 - 1 - i) * 8;
packet_length += (buf[i] & 0x000000FF) << shift; packet_length += (buf[i] & 0x000000FF) << shift;
} }
// Check whether the package is smaller than the maximal packet length. // Check whether the package is smaller than the maximal packet length.
// A package larger than this would not be possible to be send from a GossipService, // A package larger than this would not be possible to be send from a GossipService,
// since this is check before sending the message. // since this is check before sending the message.
// This could normally only occur when the list of members is very big, // This could normally only occur when the list of members is very big,
// or when the packet is misformed, and the first 4 bytes is not the right in anymore. // or when the packet is misformed, and the first 4 bytes is not the right in anymore.
// For this reason we regards the message. // For this reason we regards the message.
if (packet_length <= GossipManager.MAX_PACKET_SIZE) { if (packet_length <= GossipManager.MAX_PACKET_SIZE) {
byte[] json_bytes = new byte[packet_length]; byte[] json_bytes = new byte[packet_length];
for (int i = 0; i < packet_length; i++) { for (int i = 0; i < packet_length; i++) {
json_bytes[i] = buf[i + 4]; json_bytes[i] = buf[i + 4];
} }
String receivedMessage = new String(json_bytes); String receivedMessage = new String(json_bytes);
GossipService.LOGGER.debug("Received message (" + packet_length + " bytes): " GossipService.LOGGER.debug("Received message (" + packet_length + " bytes): "
+ receivedMessage); + receivedMessage);
try { try {
ArrayList<GossipMember> remoteGossipMembers = new ArrayList<GossipMember>(); ArrayList<GossipMember> remoteGossipMembers = new ArrayList<GossipMember>();
RemoteGossipMember senderMember = null; RemoteGossipMember senderMember = null;
GossipService.LOGGER.debug("Received member list:"); GossipService.LOGGER.debug("Received member list:");
JSONArray jsonArray = new JSONArray(receivedMessage); JSONArray jsonArray = new JSONArray(receivedMessage);
for (int i = 0; i < jsonArray.length(); i++) { for (int i = 0; i < jsonArray.length(); i++) {
JSONObject memberJSONObject = jsonArray.getJSONObject(i); JSONObject memberJSONObject = jsonArray.getJSONObject(i);
if (memberJSONObject.length() == 4) { if (memberJSONObject.length() == 4) {
RemoteGossipMember member = new RemoteGossipMember( RemoteGossipMember member = new RemoteGossipMember(
memberJSONObject.getString(GossipMember.JSON_HOST), memberJSONObject.getString(GossipMember.JSON_HOST),
memberJSONObject.getInt(GossipMember.JSON_PORT), memberJSONObject.getInt(GossipMember.JSON_PORT),
memberJSONObject.getString(GossipMember.JSON_ID), memberJSONObject.getString(GossipMember.JSON_ID),
memberJSONObject.getInt(GossipMember.JSON_HEARTBEAT)); memberJSONObject.getInt(GossipMember.JSON_HEARTBEAT));
GossipService.LOGGER.debug(member.toString()); GossipService.LOGGER.debug(member.toString());
// This is the first member found, so this should be the member who is communicating // This is the first member found, so this should be the member who is communicating
// with me. // with me.
if (i == 0) { if (i == 0) {
senderMember = member; senderMember = member;
} }
remoteGossipMembers.add(member); remoteGossipMembers.add(member);
} else { } else {
GossipService.LOGGER GossipService.LOGGER
.error("The received member object does not contain 4 objects:\n" .error("The received member object does not contain 4 objects:\n"
+ memberJSONObject.toString()); + memberJSONObject.toString());
} }
} }
// Merge our list with the one we just received // Merge our list with the one we just received
mergeLists(_gossipManager, senderMember, remoteGossipMembers); mergeLists(_gossipManager, senderMember, remoteGossipMembers);
} catch (JSONException e) { } catch (JSONException e) {
GossipService.LOGGER GossipService.LOGGER
.error("The received message is not well-formed JSON. The following message has been dropped:\n" .error("The received message is not well-formed JSON. The following message has been dropped:\n"
+ receivedMessage); + receivedMessage);
} }
} else { } else {
GossipService.LOGGER GossipService.LOGGER
.error("The received message is not of the expected size, it has been dropped."); .error("The received message is not of the expected size, it has been dropped.");
} }
} catch (IOException e) { } catch (IOException e) {
e.printStackTrace(); e.printStackTrace();
_keepRunning.set(false); _keepRunning.set(false);
} }
} }
shutdown(); shutdown();
} }
public void shutdown(){ public void shutdown(){
_server.close(); _server.close();
} }
/** /**
* Abstract method for merging the local and remote list. * Abstract method for merging the local and remote list.
* @param gossipManager The GossipManager for retrieving the local members and dead members list. * @param gossipManager The GossipManager for retrieving the local members and dead members list.
* @param senderMember The member who is sending this list, this could be used to send a response if the remote list contains out-dated information. * @param senderMember The member who is sending this list, this could be used to send a response if the remote list contains out-dated information.
* @param remoteList The list of members known at the remote side. * @param remoteList The list of members known at the remote side.
*/ */
abstract protected void mergeLists(GossipManager gossipManager, RemoteGossipMember senderMember, ArrayList<GossipMember> remoteList); abstract protected void mergeLists(GossipManager gossipManager, RemoteGossipMember senderMember, ArrayList<GossipMember> remoteList);
} }

186
src/main/java/com/google/code/gossip/manager/impl/OnlyProcessReceivedPassiveGossipThread.java
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@ -1,93 +1,93 @@
package com.google.code.gossip.manager.impl; package com.google.code.gossip.manager.impl;
import java.util.ArrayList; import java.util.ArrayList;
import com.google.code.gossip.GossipMember; import com.google.code.gossip.GossipMember;
import com.google.code.gossip.GossipService; import com.google.code.gossip.GossipService;
import com.google.code.gossip.LocalGossipMember; import com.google.code.gossip.LocalGossipMember;
import com.google.code.gossip.RemoteGossipMember; import com.google.code.gossip.RemoteGossipMember;
import com.google.code.gossip.manager.GossipManager; import com.google.code.gossip.manager.GossipManager;
import com.google.code.gossip.manager.PassiveGossipThread; import com.google.code.gossip.manager.PassiveGossipThread;
public class OnlyProcessReceivedPassiveGossipThread extends PassiveGossipThread { public class OnlyProcessReceivedPassiveGossipThread extends PassiveGossipThread {
public OnlyProcessReceivedPassiveGossipThread(GossipManager gossipManager) { public OnlyProcessReceivedPassiveGossipThread(GossipManager gossipManager) {
super(gossipManager); super(gossipManager);
} }
/** /**
* Merge remote list (received from peer), and our local member list. * Merge remote list (received from peer), and our local member list.
* Simply, we must update the heartbeats that the remote list has with * Simply, we must update the heartbeats that the remote list has with
* our list. Also, some additional logic is needed to make sure we have * our list. Also, some additional logic is needed to make sure we have
* not timed out a member and then immediately received a list with that * not timed out a member and then immediately received a list with that
* member. * member.
* @param remoteList * @param remoteList
*/ */
protected void mergeLists(GossipManager gossipManager, RemoteGossipMember senderMember, ArrayList<GossipMember> remoteList) { protected void mergeLists(GossipManager gossipManager, RemoteGossipMember senderMember, ArrayList<GossipMember> remoteList) {
synchronized (gossipManager.getDeadList()) { synchronized (gossipManager.getDeadList()) {
synchronized (gossipManager.getMemberList()) { synchronized (gossipManager.getMemberList()) {
for (GossipMember remoteMember : remoteList) { for (GossipMember remoteMember : remoteList) {
// Skip myself. We don't want ourselves in the local member list. // Skip myself. We don't want ourselves in the local member list.
if (!remoteMember.equals(gossipManager.getMyself())) { if (!remoteMember.equals(gossipManager.getMyself())) {
if (gossipManager.getMemberList().contains(remoteMember)) { if (gossipManager.getMemberList().contains(remoteMember)) {
GossipService.LOGGER.debug("The local list already contains the remote member (" + remoteMember + ")."); GossipService.LOGGER.debug("The local list already contains the remote member (" + remoteMember + ").");
// The local memberlist contains the remote member. // The local memberlist contains the remote member.
LocalGossipMember localMember = gossipManager.getMemberList().get(gossipManager.getMemberList().indexOf(remoteMember)); LocalGossipMember localMember = gossipManager.getMemberList().get(gossipManager.getMemberList().indexOf(remoteMember));
// Let's synchronize it's heartbeat. // Let's synchronize it's heartbeat.
if (remoteMember.getHeartbeat() > localMember.getHeartbeat()) { if (remoteMember.getHeartbeat() > localMember.getHeartbeat()) {
// update local list with latest heartbeat // update local list with latest heartbeat
localMember.setHeartbeat(remoteMember.getHeartbeat()); localMember.setHeartbeat(remoteMember.getHeartbeat());
// and reset the timeout of that member // and reset the timeout of that member
localMember.resetTimeoutTimer(); localMember.resetTimeoutTimer();
} }
// TODO: Otherwise, should we inform the other when the heartbeat is already higher? // TODO: Otherwise, should we inform the other when the heartbeat is already higher?
} else { } else {
// The local list does not contain the remote member. // The local list does not contain the remote member.
GossipService.LOGGER.debug("The local list does not contain the remote member (" + remoteMember + ")."); GossipService.LOGGER.debug("The local list does not contain the remote member (" + remoteMember + ").");
// The remote member is either brand new, or a previously declared dead member. // The remote member is either brand new, or a previously declared dead member.
// If its dead, check the heartbeat because it may have come back from the dead. // If its dead, check the heartbeat because it may have come back from the dead.
if (gossipManager.getDeadList().contains(remoteMember)) { if (gossipManager.getDeadList().contains(remoteMember)) {
// The remote member is known here as a dead member. // The remote member is known here as a dead member.
GossipService.LOGGER.debug("The remote member is known here as a dead member."); GossipService.LOGGER.debug("The remote member is known here as a dead member.");
LocalGossipMember localDeadMember = gossipManager.getDeadList().get(gossipManager.getDeadList().indexOf(remoteMember)); LocalGossipMember localDeadMember = gossipManager.getDeadList().get(gossipManager.getDeadList().indexOf(remoteMember));
// If a member is restarted the heartbeat will restart from 1, so we should check that here. // If a member is restarted the heartbeat will restart from 1, so we should check that here.
// So a member can become from the dead when it is either larger than a previous heartbeat (due to network failure) // So a member can become from the dead when it is either larger than a previous heartbeat (due to network failure)
// or when the heartbeat is 1 (after a restart of the service). // or when the heartbeat is 1 (after a restart of the service).
// TODO: What if the first message of a gossip service is sent to a dead node? The second member will receive a heartbeat of two. // TODO: What if the first message of a gossip service is sent to a dead node? The second member will receive a heartbeat of two.
// TODO: The above does happen. Maybe a special message for a revived member? // TODO: The above does happen. Maybe a special message for a revived member?
// TODO: Or maybe when a member is declared dead for more than _settings.getCleanupInterval() ms, reset the heartbeat to 0. // TODO: Or maybe when a member is declared dead for more than _settings.getCleanupInterval() ms, reset the heartbeat to 0.
// It will then accept a revived member. // It will then accept a revived member.
// The above is now handle by checking whether the heartbeat differs _settings.getCleanupInterval(), it must be restarted. // The above is now handle by checking whether the heartbeat differs _settings.getCleanupInterval(), it must be restarted.
if (remoteMember.getHeartbeat() == 1 if (remoteMember.getHeartbeat() == 1
|| ((localDeadMember.getHeartbeat() - remoteMember.getHeartbeat()) * -1) > (gossipManager.getSettings().getCleanupInterval() / 1000) || ((localDeadMember.getHeartbeat() - remoteMember.getHeartbeat()) * -1) > (gossipManager.getSettings().getCleanupInterval() / 1000)
|| remoteMember.getHeartbeat() > localDeadMember.getHeartbeat()) { || remoteMember.getHeartbeat() > localDeadMember.getHeartbeat()) {
GossipService.LOGGER.debug("The remote member is back from the dead. We will remove it from the dead list and add it as a new member."); GossipService.LOGGER.debug("The remote member is back from the dead. We will remove it from the dead list and add it as a new member.");
// The remote member is back from the dead. // The remote member is back from the dead.
// Remove it from the dead list. // Remove it from the dead list.
gossipManager.getDeadList().remove(localDeadMember); gossipManager.getDeadList().remove(localDeadMember);
// Add it as a new member and add it to the member list. // Add it as a new member and add it to the member list.
LocalGossipMember newLocalMember = new LocalGossipMember(remoteMember.getHost(), remoteMember.getPort(), remoteMember.getId(), remoteMember.getHeartbeat(), gossipManager, gossipManager.getSettings().getCleanupInterval()); LocalGossipMember newLocalMember = new LocalGossipMember(remoteMember.getHost(), remoteMember.getPort(), remoteMember.getId(), remoteMember.getHeartbeat(), gossipManager, gossipManager.getSettings().getCleanupInterval());
gossipManager.getMemberList().add(newLocalMember); gossipManager.getMemberList().add(newLocalMember);
newLocalMember.startTimeoutTimer(); newLocalMember.startTimeoutTimer();
GossipService.LOGGER.info("Removed remote member " + remoteMember.getAddress() + " from dead list and added to local member list."); GossipService.LOGGER.info("Removed remote member " + remoteMember.getAddress() + " from dead list and added to local member list.");
} }
} else { } else {
// Brand spanking new member - welcome. // Brand spanking new member - welcome.
LocalGossipMember newLocalMember = new LocalGossipMember(remoteMember.getHost(), remoteMember.getPort(), remoteMember.getId(), remoteMember.getHeartbeat(), gossipManager, gossipManager.getSettings().getCleanupInterval()); LocalGossipMember newLocalMember = new LocalGossipMember(remoteMember.getHost(), remoteMember.getPort(), remoteMember.getId(), remoteMember.getHeartbeat(), gossipManager, gossipManager.getSettings().getCleanupInterval());
gossipManager.getMemberList().add(newLocalMember); gossipManager.getMemberList().add(newLocalMember);
newLocalMember.startTimeoutTimer(); newLocalMember.startTimeoutTimer();
GossipService.LOGGER.info("Added new remote member " + remoteMember.getAddress() + " to local member list."); GossipService.LOGGER.info("Added new remote member " + remoteMember.getAddress() + " to local member list.");
} }
} }
} }
} }
} }
} }
} }
} }

188
src/main/java/com/google/code/gossip/manager/impl/SendMembersActiveGossipThread.java
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@ -1,94 +1,94 @@
package com.google.code.gossip.manager.impl; package com.google.code.gossip.manager.impl;
import java.io.IOException; import java.io.IOException;
import java.net.DatagramPacket; import java.net.DatagramPacket;
import java.net.DatagramSocket; import java.net.DatagramSocket;
import java.net.InetAddress; import java.net.InetAddress;
import java.nio.ByteBuffer; import java.nio.ByteBuffer;
import java.util.ArrayList; import java.util.ArrayList;
import org.json.JSONArray; import org.json.JSONArray;
import com.google.code.gossip.GossipService; import com.google.code.gossip.GossipService;
import com.google.code.gossip.LocalGossipMember; import com.google.code.gossip.LocalGossipMember;
import com.google.code.gossip.manager.ActiveGossipThread; import com.google.code.gossip.manager.ActiveGossipThread;
import com.google.code.gossip.manager.GossipManager; import com.google.code.gossip.manager.GossipManager;
abstract public class SendMembersActiveGossipThread extends ActiveGossipThread { abstract public class SendMembersActiveGossipThread extends ActiveGossipThread {
public SendMembersActiveGossipThread(GossipManager gossipManager) { public SendMembersActiveGossipThread(GossipManager gossipManager) {
super(gossipManager); super(gossipManager);
} }
/** /**
* Performs the sending of the membership list, after we have * Performs the sending of the membership list, after we have
* incremented our own heartbeat. * incremented our own heartbeat.
*/ */
protected void sendMembershipList(LocalGossipMember me, ArrayList<LocalGossipMember> memberList) { protected void sendMembershipList(LocalGossipMember me, ArrayList<LocalGossipMember> memberList) {
GossipService.LOGGER.debug("Send sendMembershipList() is called."); GossipService.LOGGER.debug("Send sendMembershipList() is called.");
// Increase the heartbeat of myself by 1. // Increase the heartbeat of myself by 1.
me.setHeartbeat(me.getHeartbeat() + 1); me.setHeartbeat(me.getHeartbeat() + 1);
synchronized (memberList) { synchronized (memberList) {
try { try {
LocalGossipMember member = selectPartner(memberList); LocalGossipMember member = selectPartner(memberList);
if (member != null) { if (member != null) {
InetAddress dest = InetAddress.getByName(member.getHost()); InetAddress dest = InetAddress.getByName(member.getHost());
// Create a StringBuffer for the JSON message. // Create a StringBuffer for the JSON message.
JSONArray jsonArray = new JSONArray(); JSONArray jsonArray = new JSONArray();
GossipService.LOGGER.debug("Sending memberlist to " + dest + ":" + member.getPort()); GossipService.LOGGER.debug("Sending memberlist to " + dest + ":" + member.getPort());
GossipService.LOGGER.debug("---------------------"); GossipService.LOGGER.debug("---------------------");
// First write myself, append the JSON representation of the member to the buffer. // First write myself, append the JSON representation of the member to the buffer.
jsonArray.put(me.toJSONObject()); jsonArray.put(me.toJSONObject());
GossipService.LOGGER.debug(me); GossipService.LOGGER.debug(me);
// Then write the others. // Then write the others.
for (int i=0; i<memberList.size(); i++) { for (int i=0; i<memberList.size(); i++) {
LocalGossipMember other = memberList.get(i); LocalGossipMember other = memberList.get(i);
// Append the JSON representation of the member to the buffer. // Append the JSON representation of the member to the buffer.
jsonArray.put(other.toJSONObject()); jsonArray.put(other.toJSONObject());
GossipService.LOGGER.debug(other); GossipService.LOGGER.debug(other);
} }
GossipService.LOGGER.debug("---------------------"); GossipService.LOGGER.debug("---------------------");
// Write the objects to a byte array. // Write the objects to a byte array.
byte[] json_bytes = jsonArray.toString().getBytes(); byte[] json_bytes = jsonArray.toString().getBytes();
int packet_length = json_bytes.length; int packet_length = json_bytes.length;
if (packet_length < GossipManager.MAX_PACKET_SIZE) { if (packet_length < GossipManager.MAX_PACKET_SIZE) {
// Convert the packet length to the byte representation of the int. // Convert the packet length to the byte representation of the int.
byte[] length_bytes = new byte[4]; byte[] length_bytes = new byte[4];
length_bytes[0] =(byte)( packet_length >> 24 ); length_bytes[0] =(byte)( packet_length >> 24 );
length_bytes[1] =(byte)( (packet_length << 8) >> 24 ); length_bytes[1] =(byte)( (packet_length << 8) >> 24 );
length_bytes[2] =(byte)( (packet_length << 16) >> 24 ); length_bytes[2] =(byte)( (packet_length << 16) >> 24 );
length_bytes[3] =(byte)( (packet_length << 24) >> 24 ); length_bytes[3] =(byte)( (packet_length << 24) >> 24 );
GossipService.LOGGER.debug("Sending message ("+packet_length+" bytes): " + jsonArray.toString()); GossipService.LOGGER.debug("Sending message ("+packet_length+" bytes): " + jsonArray.toString());
ByteBuffer byteBuffer = ByteBuffer.allocate(4 + json_bytes.length); ByteBuffer byteBuffer = ByteBuffer.allocate(4 + json_bytes.length);
byteBuffer.put(length_bytes); byteBuffer.put(length_bytes);
byteBuffer.put(json_bytes); byteBuffer.put(json_bytes);
byte[] buf = byteBuffer.array(); byte[] buf = byteBuffer.array();
DatagramSocket socket = new DatagramSocket(); DatagramSocket socket = new DatagramSocket();
DatagramPacket datagramPacket = new DatagramPacket(buf, buf.length, dest, member.getPort()); DatagramPacket datagramPacket = new DatagramPacket(buf, buf.length, dest, member.getPort());
socket.send(datagramPacket); socket.send(datagramPacket);
socket.close(); socket.close();
} else { } else {
GossipService.LOGGER.error("The length of the to be send message is too large (" + packet_length + " > " + GossipManager.MAX_PACKET_SIZE + ")."); GossipService.LOGGER.error("The length of the to be send message is too large (" + packet_length + " > " + GossipManager.MAX_PACKET_SIZE + ").");
} }
} }
} catch (IOException e1) { } catch (IOException e1) {
e1.printStackTrace(); e1.printStackTrace();
} }
} }
} }
} }

76
src/main/java/com/google/code/gossip/manager/random/RandomActiveGossipThread.java
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@ -1,38 +1,38 @@
package com.google.code.gossip.manager.random; package com.google.code.gossip.manager.random;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.Random; import java.util.Random;
import com.google.code.gossip.GossipService; import com.google.code.gossip.GossipService;
import com.google.code.gossip.LocalGossipMember; import com.google.code.gossip.LocalGossipMember;
import com.google.code.gossip.manager.GossipManager; import com.google.code.gossip.manager.GossipManager;
import com.google.code.gossip.manager.impl.SendMembersActiveGossipThread; import com.google.code.gossip.manager.impl.SendMembersActiveGossipThread;
public class RandomActiveGossipThread extends SendMembersActiveGossipThread { public class RandomActiveGossipThread extends SendMembersActiveGossipThread {
/** The Random used for choosing a member to gossip with. */ /** The Random used for choosing a member to gossip with. */
private Random _random; private Random _random;
public RandomActiveGossipThread(GossipManager gossipManager) { public RandomActiveGossipThread(GossipManager gossipManager) {
super(gossipManager); super(gossipManager);
_random = new Random(); _random = new Random();
} }
/** /**
* [The selectToSend() function.] * [The selectToSend() function.]
* Find a random peer from the local membership list. * Find a random peer from the local membership list.
* In the case where this client is the only member in the list, this method will return null. * In the case where this client is the only member in the list, this method will return null.
* @return Member random member if list is greater than 1, null otherwise * @return Member random member if list is greater than 1, null otherwise
*/ */
protected LocalGossipMember selectPartner(ArrayList<LocalGossipMember> memberList) { protected LocalGossipMember selectPartner(ArrayList<LocalGossipMember> memberList) {
LocalGossipMember member = null; LocalGossipMember member = null;
if (memberList.size() > 0) { if (memberList.size() > 0) {
int randomNeighborIndex = _random.nextInt(memberList.size()); int randomNeighborIndex = _random.nextInt(memberList.size());
member = memberList.get(randomNeighborIndex); member = memberList.get(randomNeighborIndex);
} else { } else {
GossipService.LOGGER.debug("I am alone in this world."); GossipService.LOGGER.debug("I am alone in this world.");
} }
return member; return member;
} }
} }

28
src/main/java/com/google/code/gossip/manager/random/RandomGossipManager.java
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@ -1,14 +1,14 @@
package com.google.code.gossip.manager.random; package com.google.code.gossip.manager.random;
import java.util.ArrayList; import java.util.ArrayList;
import com.google.code.gossip.GossipMember; import com.google.code.gossip.GossipMember;
import com.google.code.gossip.GossipSettings; import com.google.code.gossip.GossipSettings;
import com.google.code.gossip.manager.GossipManager; import com.google.code.gossip.manager.GossipManager;
import com.google.code.gossip.manager.impl.OnlyProcessReceivedPassiveGossipThread; import com.google.code.gossip.manager.impl.OnlyProcessReceivedPassiveGossipThread;
public class RandomGossipManager extends GossipManager { public class RandomGossipManager extends GossipManager {
public RandomGossipManager(String address, int port, String id, GossipSettings settings, ArrayList<GossipMember> gossipMembers) { public RandomGossipManager(String address, int port, String id, GossipSettings settings, ArrayList<GossipMember> gossipMembers) {
super(OnlyProcessReceivedPassiveGossipThread.class, RandomActiveGossipThread.class, address, port, id, settings, gossipMembers); super(OnlyProcessReceivedPassiveGossipThread.class, RandomActiveGossipThread.class, address, port, id, settings, gossipMembers);
} }
} }