/***************************************************************************
* Copyright (c) 2012-2013 VMware, Inc. 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 com.vmware.bdd.aop.lock;
import org.apache.log4j.Logger;
import org.aspectj.lang.ProceedingJoinPoint;
import com.vmware.bdd.utils.AuAssert;
/**
* @author Jarred Li
* @since 0.8
* @version 0.8
*
*/
public class ClusterEntityExclusiveWriteLockAdvice {
private static final Logger logger = Logger
.getLogger(ClusterEntityExclusiveWriteLockAdvice.class);
private void lockExclusiveWrite(String clusterName) {
LockFactory.getClusterLock(clusterName).writeLock().lock();
logger.debug("Cluster" + clusterName + " exclusive write is locked.");
}
private void unlockExclusiveWrite(String clusterName) {
LockFactory.getClusterLock(clusterName).writeLock().unlock();
logger.debug("Cluster" + clusterName + " exclusive write is unlocked.");
}
public Object lock(ProceedingJoinPoint pjp) throws Throwable {
Object[] objs = pjp.getArgs();
String clusterName = (String) objs[0];
logger.info("Lock exclusive write for cluster " + clusterName);
boolean locked = false;
try {
lockExclusiveWrite((String) clusterName);
locked = true;
return pjp.proceed();
} finally {
if (locked) {
unlockExclusiveWrite(clusterName);
logger.info("Unlock exclusive write for cluster " + clusterName);
}
}
}
}