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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@ -0,0 +1,61 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hdfs.server.namenode;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReadWriteLock;
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import java.util.concurrent.locks.ReentrantReadWriteLock;
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import com.google.common.annotations.VisibleForTesting;
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/**
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* Mimics a ReentrantReadWriteLock so more sophisticated locking capabilities
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* are possible.
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*/
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class FSNamesystemLock implements ReadWriteLock {
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@VisibleForTesting
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protected ReentrantReadWriteLock coarseLock;
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FSNamesystemLock(boolean fair) {
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this.coarseLock = new ReentrantReadWriteLock(fair);
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}
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@Override
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public Lock readLock() {
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return coarseLock.readLock();
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}
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@Override
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public Lock writeLock() {
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return coarseLock.writeLock();
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}
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public int getReadHoldCount() {
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return coarseLock.getReadHoldCount();
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}
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public int getWriteHoldCount() {
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return coarseLock.getWriteHoldCount();
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}
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public boolean isWriteLockedByCurrentThread() {
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return coarseLock.isWriteLockedByCurrentThread();
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}
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}
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