Java tutorial
/* * Aloha Open Source SIP Application Server- https://trac.osmosoft.com/Aloha * * Copyright (c) 2008, British Telecommunications plc. All rights reserved. * * This library is free software; you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License as published by the Free Software * Foundation; either version 3.0 of the License, or (at your option) any later * version. * * This library is distributed in the hope that it will be useful, but WITHOUT ANY * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License along * with this library; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ package com.bt.aloha.stack; import java.util.concurrent.CountDownLatch; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.ScheduledFuture; import java.util.concurrent.TimeUnit; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class QueuedSipMessageLatch extends CountDownLatch { private static final Log LOG = LogFactory.getLog(QueuedSipMessageLatch.class); private final Long sequenceNumber; private final String requestMethod; private ScheduledFuture<?> future; public QueuedSipMessageLatch(long aSequenceNumber, String aRequestMethod, long queuedSipMessageBlockingInterval, ScheduledExecutorService scheduledExecutorService) { super(1); sequenceNumber = aSequenceNumber; requestMethod = aRequestMethod; future = scheduledExecutorService.schedule(new Runnable() { public void run() { LOG.debug(String.format("Expiring queued message %d, method %s", sequenceNumber, requestMethod)); countDown(); } }, queuedSipMessageBlockingInterval, TimeUnit.MILLISECONDS); } public void completed() { countDown(); future.cancel(true); } public boolean isAlive() { return getCount() > 0; } }