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/**
* Copyright 2012-2013 Florian Schmaus
*
* All rights reserved. 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.jivesoftware.smackx.ping;
import java.lang.ref.WeakReference;
import java.util.Set;
import org.jivesoftware.smack.Connection;
class ServerPingTask implements Runnable {
// This has to be a weak reference because IIRC all threads are roots
// for objects and we have a new thread here that should hold a strong
// reference to connection so that it can be GCed.
private WeakReference<Connection> weakConnection;
private int delta = 1000; // 1 seconds
private int tries = 3; // 3 tries
protected ServerPingTask(Connection connection) {
this.weakConnection = new WeakReference<Connection>(connection);
}
public void run() {
Connection connection = weakConnection.get();
if (connection == null) {
// connection has been collected by GC
// which means we can stop the thread by breaking the loop
return;
}
if (connection.isAuthenticated()) {
PingManager pingManager = PingManager.getInstanceFor(connection);
boolean res = false;
for (int i = 0; i < tries; i++) {
if (i != 0) {
try {
Thread.sleep(delta);
} catch (InterruptedException e) {
// We received an interrupt
// This only happens if we should stop pinging
return;
}
}
res = pingManager.pingMyServer();
// stop when we receive a pong back
if (res) {
pingManager.lastSuccessfulPingByTask = System.currentTimeMillis();
break;
}
}
if (!res) {
Set<PingFailedListener> pingFailedListeners = pingManager.getPingFailedListeners();
for (PingFailedListener l : pingFailedListeners) {
l.pingFailed();
}
} else {
// Ping was successful, wind-up the periodic task again
pingManager.maybeSchedulePingServerTask();
}
}
}
}
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