org.springframework.webflow.conversation.impl.UtilConcurrentConversationLock Maven / Gradle / Ivy
/*
* Copyright 2002-2006 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 org.springframework.core.NestedRuntimeException;
import EDU.oswego.cs.dl.util.concurrent.ReentrantLock;
/**
* A conversation lock that relies on a {@link ReentrantLock} within Doug Lea's
* util.concurrent
* package. For use on JDK 1.3 and 1.4.
*
* @author Keith Donald
* @author Rob Harrop
*/
class UtilConcurrentConversationLock implements ConversationLock {
/**
* The {@link ReentrantLock} instance.
*/
private final ReentrantLock lock = new ReentrantLock();
/**
* Acquires the lock.
* @throws SystemInterruptedException if the lock cannot be acquired due to interruption
*/
public void lock() {
try {
lock.acquire();
}
catch (InterruptedException e) {
throw new SystemInterruptedException("Unable to acquire lock.", e);
}
}
/**
* Releases the lock.
*/
public void unlock() {
lock.release();
}
/**
* Exception indicating that some {@link Thread} was
* {@link Thread#interrupt() interrupted} during processing and as
* such processing was halted.
*
* Only used to wrap the checked {@link InterruptedException java.lang.InterruptedException}.
*/
public static class SystemInterruptedException extends NestedRuntimeException {
/**
* Creates a new SystemInterruptedException.
* @param msg the Exception message
*/
public SystemInterruptedException(String msg) {
super(msg);
}
/**
* Creates a new SystemInterruptedException.
* @param msg the Exception message
* @param cause the root cause of this Exception
*/
public SystemInterruptedException(String msg, Throwable cause) {
super(msg, cause);
}
}
}