hadoop AutoCloseDataSetLock 源码
haddop AutoCloseDataSetLock 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/AutoCloseDataSetLock.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.apache.hadoop.hdfs.server.common;
import org.apache.hadoop.util.AutoCloseableLock;
import org.apache.hadoop.util.StringUtils;
import java.util.concurrent.locks.Lock;
import static org.apache.hadoop.hdfs.server.datanode.DataSetLockManager.LOG;
/**
* Extending AutoCloseableLock such that the users can
* use a try-with-resource syntax.
*/
public class AutoCloseDataSetLock extends AutoCloseableLock {
private Lock lock;
private AutoCloseDataSetLock parentLock;
private DataNodeLockManager<AutoCloseDataSetLock> dataNodeLockManager;
public AutoCloseDataSetLock(Lock lock) {
this.lock = lock;
}
@Override
public void close() {
if (lock != null) {
lock.unlock();
if (dataNodeLockManager != null) {
dataNodeLockManager.hook();
}
} else {
LOG.error("Try to unlock null lock" +
StringUtils.getStackTrace(Thread.currentThread()));
}
if (parentLock != null) {
parentLock.close();
}
}
/**
* Actually acquire the lock.
*/
public void lock() {
if (lock != null) {
lock.lock();
return;
}
LOG.error("Try to lock null lock" +
StringUtils.getStackTrace(Thread.currentThread()));
}
public void setParentLock(AutoCloseDataSetLock parent) {
if (parentLock == null) {
this.parentLock = parent;
}
}
public void setDataNodeLockManager(DataNodeLockManager<AutoCloseDataSetLock>
dataNodeLockManager) {
this.dataNodeLockManager = dataNodeLockManager;
}
}
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