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NoLockFactory.java
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NoLockFactory.java
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package org.apache.lucene.store;
/*
* 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.
*/
import java.io.IOException;
/**
* Use this {@link LockFactory} to disable locking entirely.
* Only one instance of this lock is created. You should call {@link
* #getNoLockFactory()} to get the instance.
*
* @see LockFactory
*/
public class NoLockFactory extends LockFactory {
// Single instance returned whenever makeLock is called.
private static NoLock singletonLock = new NoLock();
private static NoLockFactory singleton = new NoLockFactory();
private NoLockFactory() {}
public static NoLockFactory getNoLockFactory() {
return singleton;
}
@Override
public Lock makeLock(String lockName) {
return singletonLock;
}
@Override
public void clearLock(String lockName) {}
}
class NoLock extends Lock {
@Override
public boolean obtain() throws IOException {
return true;
}
@Override
public void close() {
}
@Override
public boolean isLocked() {
return false;
}
@Override
public String toString() {
return "NoLock";
}
}