/*************************GO-LICENSE-START*********************************
* Copyright 2014 ThoughtWorks, Inc.
*
* 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.
*************************GO-LICENSE-END***********************************/
package com.thoughtworks.go.util;
import org.junit.Before;
import org.junit.After;
import org.junit.Test;
import static org.junit.Assert.assertThat;
import static org.hamcrest.core.Is.is;
public class DynamicReadWriteLockTest {
private DynamicReadWriteLock readWriteLock;
private volatile int numberOfLocks;
@Before public void setUp() {
readWriteLock = new DynamicReadWriteLock();
numberOfLocks = 0;
}
@After public void tearDown() {
}
@Test public void shouldEnforceMutualExclutionOfWriteLockForGivenName() throws InterruptedException {
readWriteLock.acquireWriteLock("foo");
new Thread(new Runnable() {
public void run() {
readWriteLock.acquireWriteLock("foo");
numberOfLocks++;
}
}).start();
Thread.sleep(1000);
assertThat(numberOfLocks, is(0));
}
@Test public void shouldNotEnforceMutualExclutionOfReadLockForGivenName() throws InterruptedException {
readWriteLock.acquireReadLock("foo");
new Thread(new Runnable() {
public void run() {
readWriteLock.acquireReadLock("foo");
numberOfLocks++;
}
}).start();
Thread.sleep(1000);
assertThat(numberOfLocks, is(1));
}
@Test public void shouldEnforceMutualExclutionOfReadAndWriteLockForGivenName() throws InterruptedException {
readWriteLock.acquireReadLock("foo");
new Thread(new Runnable() {
public void run() {
readWriteLock.acquireWriteLock("foo");
numberOfLocks++;
}
}).start();
Thread.sleep(1000);
assertThat(numberOfLocks, is(0));
}
@Test public void shouldEnforceMutualExclutionOfWriteAndReadLockForGivenName() throws InterruptedException {
readWriteLock.acquireWriteLock("foo");
new Thread(new Runnable() {
public void run() {
readWriteLock.acquireReadLock("foo");
numberOfLocks++;
}
}).start();
Thread.sleep(1000);
assertThat(numberOfLocks, is(0));
}
@Test public void shouldNotEnforceMutualExclutionOfWriteLockForDifferentNames() throws InterruptedException {
readWriteLock.acquireWriteLock("foo");
new Thread(new Runnable() {
public void run() {
readWriteLock.acquireWriteLock("bar");
numberOfLocks++;
}
}).start();
Thread.sleep(1000);
assertThat(numberOfLocks, is(1));
}
}