hadoop NoLockManager 源码
haddop NoLockManager 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/NoLockManager.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 java.util.concurrent.locks.Lock;
/**
* Some ut or temp replicaMap not need to lock with DataSetLockManager.
*/
public class NoLockManager implements DataNodeLockManager<AutoCloseDataSetLock> {
private final NoDataSetLock lock = new NoDataSetLock(null);
private static final class NoDataSetLock extends AutoCloseDataSetLock {
private NoDataSetLock(Lock lock) {
super(lock);
}
@Override
public void lock() {
}
@Override
public void close() {
}
}
public NoLockManager() {
}
@Override
public AutoCloseDataSetLock readLock(LockLevel level, String... resources) {
return lock;
}
@Override
public AutoCloseDataSetLock writeLock(LockLevel level, String... resources) {
return lock;
}
@Override
public void addLock(LockLevel level, String... resources) {
}
@Override
public void removeLock(LockLevel level, String... resources) {
}
@Override
public void hook() {
}
}
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