ai.grakn.engine.lock.NonReentrantLock Maven / Gradle / Ivy
/*
* Grakn - A Distributed Semantic Database
* Copyright (C) 2016 Grakn Labs Limited
*
* Grakn is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Grakn is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Grakn. If not, see .
*/
package ai.grakn.engine.lock;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
/**
* A non-reentrant lock
*
* @author alexandraorth
*/
public class NonReentrantLock implements Lock {
private final Semaphore semaphore;
public NonReentrantLock(){
semaphore = new Semaphore(1);
}
@Override
public void lock() {
semaphore.acquireUninterruptibly(1);
}
@Override
public void lockInterruptibly() throws InterruptedException {
semaphore.acquire(1);
}
@Override
public boolean tryLock() {
return semaphore.tryAcquire(1);
}
@Override
public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {
return semaphore.tryAcquire(1, time, unit);
}
@Override
public void unlock() {
semaphore.release(1);
}
@Override
public Condition newCondition() {
throw new UnsupportedOperationException();
}
}
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