/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.resource;
import org.junit.Assert;
import org.junit.Test;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* Unit tests for {@link LockResource}.
*/
public final class LockResourceTest {
/**
* Tests {@link LockResource} with {@link ReentrantLock}.
*/
@Test
public void reentrantLock() {
Lock lock = new ReentrantLock();
try (LockResource r1 = new LockResource(lock)) {
try (LockResource r2 = new LockResource(lock)) {
Assert.assertTrue(lock.tryLock());
lock.unlock();
}
}
}
/**
* Tests {@link LockResource} with {@link ReentrantReadWriteLock}.
*/
@Test
public void reentrantReadWriteLock() {
ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
try (LockResource r1 = new LockResource(lock.readLock())) {
try (LockResource r2 = new LockResource(lock.readLock())) {
Assert.assertEquals(lock.getReadHoldCount(), 2);
Assert.assertTrue(lock.readLock().tryLock());
lock.readLock().unlock();
}
}
Assert.assertEquals(lock.getReadHoldCount(), 0);
try (LockResource r1 = new LockResource(lock.writeLock())) {
try (LockResource r2 = new LockResource(lock.readLock())) {
Assert.assertTrue(lock.isWriteLockedByCurrentThread());
Assert.assertEquals(lock.getReadHoldCount(), 1);
}
}
Assert.assertFalse(lock.isWriteLockedByCurrentThread());
Assert.assertEquals(lock.getReadHoldCount(), 0);
try (LockResource r = new LockResource(lock.readLock())) {
Assert.assertFalse(lock.writeLock().tryLock());
}
}
}