Added status update for when a client goes offline

src/main/java/envoy/server/ConnectionManager.java

@@ -7,6 +7,11 @@ import java.util.Set;
 
 import com.jenkov.nioserver.ISocketIdListener;
 
+import envoy.data.User;
+import envoy.event.UserStatusChangeEvent;
+import envoy.server.database.PersistenceManager;
+import envoy.server.processors.UserStatusChangeProcessor;
+
 /**
  * Project: <strong>envoy-server-standalone</strong><br>
  * File: <strong>ConnectionManager.java</strong><br>
@@ -44,6 +49,11 @@ public class ConnectionManager implements ISocketIdListener {
 
 	@Override
 	public void socketCancelled(long socketId) {
+		// notifying contacts of this users offline-going
+		long	clientId	= getUserIdBySocketId(socketId);
+		User	user		= new User(clientId, PersistenceManager.getPersistenceManager().getUserById(clientId).getName());
+		UserStatusChangeProcessor.updateUserStatus(new UserStatusChangeEvent(user));
+		// removing the socket
 		if (!pendingSockets.remove(socketId))
 			sockets.entrySet().stream().filter(e -> e.getValue() == socketId).forEach(e -> sockets.remove(e.getValue()));
 	}
@@ -70,6 +80,15 @@ public class ConnectionManager implements ISocketIdListener {
 	 */
 	public long getSocketId(long userId) { return sockets.get(userId); }
 
+	/**
+	 * @param socketId the id of the socket whose User is needed
+	 * @return the userId associated with this socketId
+	 * @since Envoy Server Standalone v0.1-alpha
+	 */
+	public long getUserIdBySocketId(long socketId) {
+		return sockets.entrySet().stream().filter((entry) -> entry.getValue().equals(socketId)).findFirst().get().getKey();
+	}
+
 	/**
 	 * @param userId the ID of the user to check for
 	 * @return {@code true} if the user is online

src/main/java/envoy/server/processors/LoginCredentialProcessor.java

@@ -37,6 +37,7 @@ public class LoginCredentialProcessor implements ObjectProcessor<LoginCredential
 
 	@Override
 	public void process(LoginCredentials input, long socketId, ObjectWriteProxy writeProxy) throws IOException {
+		UserStatusChangeProcessor.setWriteProxy(writeProxy);
 		System.out.println(String.format("Received login credentials %s from socket ID %d", input, socketId));
 
 		envoy.server.data.User user = getUser(input);
@@ -45,7 +46,7 @@ public class LoginCredentialProcessor implements ObjectProcessor<LoginCredential
 		if (user == null) return;
 		// notifies contacts of this users online-going and updates his status in the
 		// database
-		UserStatusChangeProcessor.updateUserStatus(new UserStatusChangeEvent(user.toCommonUser()), writeProxy);
+		UserStatusChangeProcessor.updateUserStatus(new UserStatusChangeEvent(user.toCommonUser()));
 
 		ConnectionManager.getInstance().registerUser(user.getId(), socketId);
 

src/main/java/envoy/server/processors/UserStatusChangeProcessor.java

@@ -22,19 +22,20 @@ import envoy.server.net.ObjectWriteProxy;
  */
 public class UserStatusChangeProcessor implements ObjectProcessor<UserStatusChangeEvent> {
 
+	private static ObjectWriteProxy writeProxy;
+
 	@Override
 	public Class<UserStatusChangeEvent> getInputClass() { return UserStatusChangeEvent.class; }
 
 	@Override
 	public void process(UserStatusChangeEvent input, long socketId, ObjectWriteProxy writeProxy) throws IOException {
-
 		PersistenceManager perMan = PersistenceManager.getPersistenceManager();
 		// new status should not equal old status
 		if (input.get().equals(perMan.getUserById(input.getId()).getStatus())) {
 			System.out.println("Received an unnecessary UserStatusChangeEvent");
 			return;
 		}
-		updateUserStatus(input, writeProxy);
+		updateUserStatus(input);
 
 	}
 
@@ -43,19 +44,16 @@ public class UserStatusChangeProcessor implements ObjectProcessor<UserStatusChan
 	 * currently online contacts are notified.
 	 *
 	 * @param evt the {@link UserStatusChangeEvent} that signals the change
-	 * @param writeProxy the {@link ObjectWriteProxy} that is used to send objects
-	 *                   back to clients
-	 * @throws IOException if sending this update failed for any contact
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public static void updateUserStatus(UserStatusChangeEvent evt, ObjectWriteProxy writeProxy) throws IOException {
+	public static void updateUserStatus(UserStatusChangeEvent evt) {
+		// handling for newly logged in clients
 		PersistenceManager		perMan	= PersistenceManager.getPersistenceManager();
 		envoy.server.data.User	user	= perMan.getUserById(evt.getId());
-		// handling for newly logged in clients
 		perMan.updateUserStatus(user, evt.get());
 
 		// handling for contacts that are already online
-		notifyContacts(evt, user, writeProxy);
+		notifyContacts(evt, user);
 	}
 
 	/**
@@ -64,15 +62,29 @@ public class UserStatusChangeProcessor implements ObjectProcessor<UserStatusChan
 	 *
 	 * @param evt  the {@link UserStatusChangeEvent} to send to other clients
 	 * @param user the {@link User}
-	 * @param writeProxy the {@link ObjectWriteProxy} that is used to send objects
-	 *                   back to clients
 	 * @throws IOException if sending this update failed for any contact
 	 * @since Envoy Server Standalone v0.1-alpha
 	 */
-	public static void notifyContacts(UserStatusChangeEvent evt, envoy.server.data.User user, ObjectWriteProxy writeProxy) throws IOException {
+	private static void notifyContacts(UserStatusChangeEvent evt, envoy.server.data.User user) {
 		ConnectionManager conMan = ConnectionManager.getInstance();
+		try {
 			for (User contact : user.getContacts())
 				if (conMan.isOnline(contact.getId())) writeProxy.write(conMan.getSocketId(contact.getId()), evt);
+		} catch (IOException e) {
+			e.printStackTrace();
+			System.err.println("Could not notify online contacts of user" + evt.getId() + "that his status changed");
+		}
 	}
 
+	/**
+	 * This method is only called by the LoginCredentialProcessor because every
+	 * user needs to login (open a socket) before changing his status.
+	 * Needed to ensure propagation of events because an uninitialised writeProxy
+	 * would cause problems.
+	 *
+	 * @param writeProxy the writeProxy that is used to send objects back to clients
+	 * @since Envoy Server Standalone v0.1-alpha
+	 */
+	public static void setWriteProxy(ObjectWriteProxy writeProxy) { UserStatusChangeProcessor.writeProxy = writeProxy; }
+
 }