/*
* Copyright 2004-2012 the original author or authors.
*
* 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.springframework.webflow.conversation.impl;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import org.springframework.webflow.conversation.ConversationLockException;
/**
* A conversation lock that relies on a {@link ReentrantLock} within Java 5's <code>util.concurrent.locks</code>
* package.
*
* @author Keith Donald
*/
public class JdkConcurrentConversationLock implements ConversationLock {
private Lock lock = new ReentrantLock();
private int timeoutSeconds;
public JdkConcurrentConversationLock(int timeoutSeconds) {
this.timeoutSeconds = timeoutSeconds;
}
public void lock() throws ConversationLockException {
try {
boolean acquired = this.lock.tryLock(this.timeoutSeconds, TimeUnit.SECONDS);
if (!acquired) {
throw new LockTimeoutException(this.timeoutSeconds);
}
} catch (InterruptedException e) {
throw new LockInterruptedException(e);
}
}
public void unlock() {
this.lock.unlock();
}
}