Neglected to add new file in HDFS-5514 (daryn)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548167 13f79535-47bb-0310-9956-ffa450edef68
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Daryn Sharp 2013-12-05 15:31:35 +00:00
parent 6828337d85
commit 99aed805f8
1 changed files with 61 additions and 0 deletions

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/**
* 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
*
* 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.apache.hadoop.hdfs.server.namenode;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import com.google.common.annotations.VisibleForTesting;
/**
* Mimics a ReentrantReadWriteLock so more sophisticated locking capabilities
* are possible.
*/
class FSNamesystemLock implements ReadWriteLock {
@VisibleForTesting
protected ReentrantReadWriteLock coarseLock;
FSNamesystemLock(boolean fair) {
this.coarseLock = new ReentrantReadWriteLock(fair);
}
@Override
public Lock readLock() {
return coarseLock.readLock();
}
@Override
public Lock writeLock() {
return coarseLock.writeLock();
}
public int getReadHoldCount() {
return coarseLock.getReadHoldCount();
}
public int getWriteHoldCount() {
return coarseLock.getWriteHoldCount();
}
public boolean isWriteLockedByCurrentThread() {
return coarseLock.isWriteLockedByCurrentThread();
}
}