Keep references to threads and shut them down more properly

src/main/java/com/google/code/gossip/manager/ActiveGossipThread.java

@@ -18,7 +18,7 @@ abstract public class ActiveGossipThread implements Runnable {
 	
 	private GossipManager _gossipManager;
 	
-	private AtomicBoolean _keepRunning;
+	private final AtomicBoolean _keepRunning;
 
 	public ActiveGossipThread(GossipManager gossipManager) {
 		_gossipManager = gossipManager;
@@ -36,10 +36,12 @@ abstract public class ActiveGossipThread implements Runnable {
 				_keepRunning.set(false);
 			}
 		}
-
-		_keepRunning = null;
+		shutdown();
 	}
 	
+	public void shutdown(){
+	  _keepRunning.set(false);
+	}
 	/**
 	 * Performs the sending of the membership list, after we have
 	 * incremented our own heartbeat.

src/main/java/com/google/code/gossip/manager/GossipManager.java

@@ -38,8 +38,10 @@ public abstract class GossipManager extends Thread implements NotificationListen
 	private ExecutorService _gossipThreadExecutor;
 	
 	private Class<? extends PassiveGossipThread> _passiveGossipThreadClass;
+	private PassiveGossipThread passiveGossipThread; 
 	
 	private Class<? extends ActiveGossipThread> _activeGossipThreadClass;
+	private ActiveGossipThread activeGossipThread;
 	
   public GossipManager(Class<? extends PassiveGossipThread> passiveGossipThreadClass,
           Class<? extends ActiveGossipThread> activeGossipThreadClass, String address, int port,
@@ -118,10 +120,10 @@ public abstract class GossipManager extends Thread implements NotificationListen
 		}
     _gossipThreadExecutor = Executors.newCachedThreadPool();
     try {
-      _gossipThreadExecutor.execute(_passiveGossipThreadClass.getConstructor(GossipManager.class)
-              .newInstance(this));
-      _gossipThreadExecutor.execute(_activeGossipThreadClass.getConstructor(GossipManager.class)
-              .newInstance(this));
+      passiveGossipThread = _passiveGossipThreadClass.getConstructor(GossipManager.class).newInstance(this);
+      _gossipThreadExecutor.execute(passiveGossipThread);
+      activeGossipThread = _activeGossipThreadClass.getConstructor(GossipManager.class).newInstance(this);
+      _gossipThreadExecutor.execute(activeGossipThread);
     } catch (InstantiationException | IllegalAccessException | IllegalArgumentException
             | InvocationTargetException | NoSuchMethodException | SecurityException e1) {
       throw new RuntimeException(e1);
@@ -142,6 +144,14 @@ public abstract class GossipManager extends Thread implements NotificationListen
 	 */
 	public void shutdown() {
 		_gossipThreadExecutor.shutdown();
+		passiveGossipThread.shutdown();
+		activeGossipThread.shutdown();
+		try {
+      boolean result = _gossipThreadExecutor.awaitTermination(1000, TimeUnit.MILLISECONDS);
+      System.err.println("Terminate retuned " + result);
+    } catch (InterruptedException e) {
+      e.printStackTrace();
+    }
 		_gossipServiceRunning.set(false);
 	}
 }

src/main/java/com/google/code/gossip/manager/PassiveGossipThread.java

@@ -125,6 +125,11 @@ abstract public class PassiveGossipThread implements Runnable {
         _keepRunning.set(false);
       }
     }
+    shutdown();
+  }
+	
+  public void shutdown(){
+    _server.close();
   }
   
 	/**

src/test/java/io/teknek/gossip/TenNodeThreeSeedTest.java

@@ -18,6 +18,15 @@ public class TenNodeThreeSeedTest {
   
   @Test
   public void test() throws UnknownHostException, InterruptedException{
+    abc();
+  }
+  
+  @Test
+  public void testAgain() throws UnknownHostException, InterruptedException{
+    abc();
+  }
+  
+  public void abc() throws InterruptedException, UnknownHostException{
     GossipSettings settings = new GossipSettings();
     int seedNodes = 3;
     ArrayList<GossipMember> startupMembers = new ArrayList<GossipMember>();