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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed 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.onosproject.ui.impl;
import org.eclipse.jetty.websocket.WebSocket;
import org.eclipse.jetty.websocket.WebSocketServlet;
import org.onlab.osgi.DefaultServiceDirectory;
import org.onlab.osgi.ServiceDirectory;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;
/**
* Web socket servlet capable of creating web sockets for the user interface.
*/
public class UiWebSocketServlet extends WebSocketServlet {
private static final long PING_DELAY_MS = 5000;
private static UiWebSocketServlet instance;
private ServiceDirectory directory = new DefaultServiceDirectory();
private final Set<UiWebSocket> sockets = new HashSet<>();
private final Timer timer = new Timer();
private final TimerTask pruner = new Pruner();
private boolean isStopped = false;
/**
* Closes all currently open UI web-sockets.
*/
public static void closeAll() {
if (instance != null) {
instance.isStopped = true;
instance.sockets.forEach(UiWebSocket::close);
instance.sockets.clear();
instance.pruner.cancel();
instance.timer.cancel();
}
}
@Override
public void init() throws ServletException {
super.init();
instance = this;
timer.schedule(pruner, PING_DELAY_MS, PING_DELAY_MS);
}
@Override
public WebSocket doWebSocketConnect(HttpServletRequest request, String protocol) {
if (isStopped) {
return null;
}
UiWebSocket socket = new UiWebSocket(directory);
synchronized (sockets) {
sockets.add(socket);
}
return socket;
}
// Task for pruning web-sockets that are idle.
private class Pruner extends TimerTask {
@Override
public void run() {
synchronized (sockets) {
Iterator<UiWebSocket> it = sockets.iterator();
while (it.hasNext()) {
UiWebSocket socket = it.next();
if (socket.isIdle()) {
it.remove();
socket.close();
}
}
}
}
}
}
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