| /** |
| * 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(); |
| } |
| } |
| } |
| } |