More or less properly shutdown client / network node

demo/src/main/java/ch/dissem/bitmessage/demo/Main.java

@@ -39,17 +39,18 @@ public class Main {
         DatabaseRepository repo = new DatabaseRepository();
         Context.init(repo, repo, networkNode, 48444);
         Context.getInstance().addStream(1);
-        networkNode.setListener(new NetworkHandler.MessageListener() {
+        networkNode.start(new NetworkHandler.MessageListener() {
             @Override
             public void receive(ObjectPayload payload) {
 //                LOG.info("message received: " + payload);
 //                System.out.print('.');
             }
         });
-        networkNode.start();
 
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
-        System.out.print("Enter String");
+        System.out.print("Press Enter to exit\n");
         br.readLine();
+        LOG.info("Shutting down client");
+        networkNode.stop();
     }
 }

domain/src/main/java/ch/dissem/bitmessage/ports/NetworkHandler.java

@@ -22,9 +22,9 @@ import ch.dissem.bitmessage.entity.payload.ObjectPayload;
  * Handles incoming messages
  */
 public interface NetworkHandler {
-    void setListener(MessageListener listener);
+    void start(MessageListener listener);
 
-    void start();
+    void stop();
 
     void send(ObjectPayload payload);
 

networking/src/main/java/ch/dissem/bitmessage/networking/Connection.java

@@ -183,7 +183,7 @@ public class Connection implements Runnable {
         }
     }
 
-    private void disconnect() {
+    public void disconnect() {
         try {
             state = DISCONNECTED;
             socket.close();

networking/src/main/java/ch/dissem/bitmessage/networking/NetworkNode.java

@@ -41,41 +41,34 @@ public class NetworkNode implements NetworkHandler {
     private final static Logger LOG = LoggerFactory.getLogger(NetworkNode.class);
     private final ExecutorService pool;
     private final List<Connection> connections = new LinkedList<>();
-    private MessageListener listener;
+    private ServerSocket serverSocket;
+    private Thread connectionManager;
 
     public NetworkNode() {
         pool = Executors.newCachedThreadPool();
     }
 
     @Override
-    public void setListener(final MessageListener listener) {
-        if (this.listener != null) {
-            throw new IllegalStateException("Listener can only be set once");
-        }
-        this.listener = listener;
-    }
-
-    @Override
-    public void start() {
+    public void start(final MessageListener listener) {
         final Context ctx = Context.getInstance();
         if (listener == null) {
             throw new IllegalStateException("Listener must be set at start");
         }
         try {
-            final ServerSocket serverSocket = new ServerSocket(Context.getInstance().getPort());
+            serverSocket = new ServerSocket(Context.getInstance().getPort());
             pool.execute(new Runnable() {
                 @Override
                 public void run() {
                     try {
                         Socket socket = serverSocket.accept();
-                        socket.setSoTimeout(20000);
+                        socket.setSoTimeout(10000);
                         startConnection(new Connection(SERVER, socket, listener));
                     } catch (IOException e) {
                         LOG.debug(e.getMessage(), e);
                     }
                 }
             });
-            Thread connectionManager = new Thread(new Runnable() {
+            connectionManager = new Thread(new Runnable() {
                 @Override
                 public void run() {
                     while (!Thread.interrupted()) {
@@ -114,6 +107,22 @@ public class NetworkNode implements NetworkHandler {
         }
     }
 
+    @Override
+    public void stop() {
+        connectionManager.interrupt();
+        try {
+            serverSocket.close();
+        } catch (IOException e) {
+            LOG.debug(e.getMessage(), e);
+        }
+        synchronized (connections) {
+            for (Connection c : connections) {
+                c.disconnect();
+            }
+        }
+        pool.shutdownNow();
+    }
+
     private void startConnection(Connection c) {
         synchronized (connections) {
             connections.add(c);