/*
* Copyright (c) 2006-2017 DMDirc Developers
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
* documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
* OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package com.dmdirc.addons.ui_web2;
import com.dmdirc.events.eventbus.EventBus;
import java.io.IOException;
import java.util.Collection;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.eclipse.jetty.websocket.api.Session;
/**
* Manages events raised by the {@link WebSocketHandler}.
*
*
This serves as a bridge between the {@link WebSocketHandler}, which cannot have dependencies
* passed in sanely due to the framework, and the rest of the plugin/client.
*/
@Singleton
public class WebSocketController {
private final Collection sessions = new CopyOnWriteArrayList<>();
private final Object sessionLock = new Object();
private final AtomicBoolean subscribed = new AtomicBoolean(false);
private final EventBus eventBus;
private final InitialStateProducer initialStateProducer;
@Inject
public WebSocketController(final EventBus eventBus, final InitialStateProducer initialStateProducer) {
this.eventBus = eventBus;
this.initialStateProducer = initialStateProducer;
}
/**
* Handles a session connected event raised by a {@link WebSocketHandler}.
*
* @param session The session that is now connected.
*/
void sessionConnected(final Session session) {
synchronized (sessionLock) {
if (!subscribed.getAndSet(true)) {
eventBus.subscribe(this);
}
sessions.add(session);
}
sendMessage(session, initialStateProducer.getInitialState());
}
/**
* Handles a session closed event raised by a {@link WebSocketHandler}.
*
* @param session The session that is now closed.
* @param statusCode The status code returned.
* @param reason The reason for quitting.
*/
void sessionClosed(final Session session, final int statusCode, final String reason) {
synchronized (sessionLock) {
sessions.remove(session);
if (sessions.isEmpty() && subscribed.getAndSet(false)) {
eventBus.unsubscribe(this);
}
}
}
/**
* Handles a message received event raised by a {@link WebSocketHandler}.
*
* @param session The session that the message is sent on.
* @param message The message that was received.
*/
void messageReceived(final Session session, final String message) {
// Echo the message back for testing
sendMessage(session, message);
}
/**
* Sends a message to a specific session.
*
* @param session The session to send a message to.
* @param message The message to be sent.
*/
private void sendMessage(final Session session, final String message) {
try {
WebSocketHandler.sendMessage(session, message);
} catch (IOException ex) {
// TODO: Raise an error...
}
}
/**
* Sends a message to all connected sessions.
*
* @param message The message to be sent.
*/
private void sendMessage(final String message) {
sessions.forEach(s -> sendMessage(s, message));
}
}