renamed packages from 'google' to 'apache' and updated necessary imports

src/main/java/org/apache/gossip/StartupSettings.java

@@ -0,0 +1,212 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.gossip;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.log4j.Logger;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+/**
+ * This object represents the settings used when starting the gossip service.
+ * 
+ * @author harmenw
+ */
+public class StartupSettings {
+  private static final Logger log = Logger.getLogger(StartupSettings.class);
+
+  /** The id to use fo the service */
+  private String id;
+
+  /** The port to start the gossip service on. */
+  private int port;
+
+  private String cluster;
+
+  /** The gossip settings used at startup. */
+  private final GossipSettings gossipSettings;
+
+  /** The list with gossip members to start with. */
+  private final List<GossipMember> gossipMembers;
+
+  /**
+   * Constructor.
+   * 
+   * @param id
+   *          The id to be used for this service
+   * @param port
+   *          The port to start the service on.
+   * @param logLevel
+   *          unused
+   */
+  public StartupSettings(String id, int port, int logLevel, String cluster) {
+    this(id, port, new GossipSettings(), cluster);
+  }
+
+  /**
+   * Constructor.
+   * 
+   * @param id
+   *          The id to be used for this service
+   * @param port
+   *          The port to start the service on.
+   */
+  public StartupSettings(String id, int port, GossipSettings gossipSettings, String cluster) {
+    this.id = id;
+    this.port = port;
+    this.gossipSettings = gossipSettings;
+    this.setCluster(cluster);
+    gossipMembers = new ArrayList<>();
+  }
+
+  public void setCluster(String cluster) {
+    this.cluster = cluster;
+  }
+
+  public String getCluster() {
+    return cluster;
+  }
+
+  /**
+   * Set the id to be used for this service.
+   * 
+   * @param id
+   *          The id for this service.
+   */
+  public void setId(String id) {
+    this.id = id;
+  }
+
+  /**
+   * Get the id for this service.
+   * 
+   * @return the service's id.
+   */
+  public String getId() {
+    return id;
+  }
+
+  /**
+   * Set the port of the gossip service.
+   * 
+   * @param port
+   *          The port for the gossip service.
+   */
+  public void setPort(int port) {
+    this.port = port;
+  }
+
+  /**
+   * Get the port for the gossip service.
+   * 
+   * @return The port of the gossip service.
+   */
+  public int getPort() {
+    return port;
+  }
+
+  /**
+   * Get the GossipSettings.
+   * 
+   * @return The GossipSettings object.
+   */
+  public GossipSettings getGossipSettings() {
+    return gossipSettings;
+  }
+
+  /**
+   * Add a gossip member to the list of members to start with.
+   * 
+   * @param member
+   *          The member to add.
+   */
+  public void addGossipMember(GossipMember member) {
+    gossipMembers.add(member);
+  }
+
+  /**
+   * Get the list with gossip members.
+   * 
+   * @return The gossip members.
+   */
+  public List<GossipMember> getGossipMembers() {
+    return gossipMembers;
+  }
+
+  /**
+   * Parse the settings for the gossip service from a JSON file.
+   * 
+   * @param jsonFile
+   *          The file object which refers to the JSON 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 FileNotFoundException
+   *           Thrown when the file cannot be found.
+   * @throws IOException
+   *           Thrown when reading the file gives problems.
+   */
+  public static StartupSettings fromJSONFile(File jsonFile) throws JSONException,
+          FileNotFoundException, IOException {
+    // Read the file to a String.
+    StringBuffer buffer = new StringBuffer();
+    try (BufferedReader br = new BufferedReader(new FileReader(jsonFile)) ){
+      String line;
+      while ((line = br.readLine()) != null) {
+        buffer.append(line.trim());
+      }
+    }
+    
+    JSONObject jsonObject = new JSONArray(buffer.toString()).getJSONObject(0);
+    int port = jsonObject.getInt("port");
+    String id = jsonObject.getString("id");
+    int gossipInterval = jsonObject.getInt("gossip_interval");
+    int cleanupInterval = jsonObject.getInt("cleanup_interval");
+    String cluster = jsonObject.getString("cluster");
+    if (cluster == null){
+      throw new IllegalArgumentException("cluster was null. It is required");
+    }
+    StartupSettings settings = new StartupSettings(id, port, new GossipSettings(gossipInterval,
+            cleanupInterval), cluster);
+
+    // Now iterate over the members from the config file and add them to the settings.
+    String configMembersDetails = "Config-members [";
+    JSONArray membersJSON = jsonObject.getJSONArray("members");
+    for (int i = 0; i < membersJSON.length(); i++) {
+      JSONObject memberJSON = membersJSON.getJSONObject(i);
+      RemoteGossipMember member = new RemoteGossipMember(memberJSON.getString("cluster"),
+              memberJSON.getString("host"), memberJSON.getInt("port"), "");
+      settings.addGossipMember(member);
+      configMembersDetails += member.getAddress();
+      if (i < (membersJSON.length() - 1))
+        configMembersDetails += ", ";
+    }
+    log.info(configMembersDetails + "]");
+
+    // Return the created settings object.
+    return settings;
+  }
+}