// Copyright 2017 JanusGraph Authors
//
// Licensed 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.janusgraph.diskstorage.util;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
/**
* Implementation of a lock that has no effect, i.e. does not actually lock anything.
*
* @author Matthias Broecheler (me@matthiasb.com)
*/
public class NoLock implements Lock {
public static final Lock INSTANCE = new NoLock();
private NoLock() {}
public static final Lock getLock() {
return INSTANCE;
}
@Override
public void lock() {
}
@Override
public void lockInterruptibly() throws InterruptedException {
throw new UnsupportedOperationException();
}
@Override
public boolean tryLock() {
return true;
}
@Override
public boolean tryLock(long l, TimeUnit timeUnit) throws InterruptedException {
return true;
}
@Override
public void unlock() {
}
@Override
public Condition newCondition() {
throw new UnsupportedOperationException();
}
}