/*
* 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.
*/
package org.apache.brooklyn.util.core.mutex;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import org.apache.brooklyn.util.core.mutex.MutexSupport;
import org.apache.brooklyn.util.core.mutex.SemaphoreWithOwners;
import org.apache.brooklyn.util.core.mutex.WithMutexes;
import org.testng.Assert;
import org.testng.annotations.Test;
public class WithMutexesTest {
@Test
public void testOneAcquisitionAndRelease() throws InterruptedException {
MutexSupport m = new MutexSupport();
Map<String, SemaphoreWithOwners> sems;
SemaphoreWithOwners s;
try {
m.acquireMutex("foo", "something foo");
sems = m.getAllSemaphores();
Assert.assertEquals(sems.size(), 1);
s = sems.get("foo");
Assert.assertEquals(s.getDescription(), "something foo");
Assert.assertEquals(s.getOwningThreads(), Arrays.asList(Thread.currentThread()));
Assert.assertEquals(s.getRequestingThreads(), Collections.emptyList());
Assert.assertTrue(s.isInUse());
Assert.assertTrue(s.isCallingThreadAnOwner());
} finally {
m.releaseMutex("foo");
}
Assert.assertFalse(s.isInUse());
Assert.assertFalse(s.isCallingThreadAnOwner());
Assert.assertEquals(s.getDescription(), "something foo");
Assert.assertEquals(s.getOwningThreads(), Collections.emptyList());
Assert.assertEquals(s.getRequestingThreads(), Collections.emptyList());
sems = m.getAllSemaphores();
Assert.assertEquals(sems, Collections.emptyMap());
}
@Test(groups = "Integration") //just because it takes a wee while
public void testBlockingAcquisition() throws InterruptedException {
final MutexSupport m = new MutexSupport();
m.acquireMutex("foo", "something foo");
Assert.assertFalse(m.tryAcquireMutex("foo", "something else"));
Thread t = new Thread() {
public void run() {
try {
m.acquireMutex("foo", "thread 2 foo");
} catch (InterruptedException e) {
e.printStackTrace();
}
m.releaseMutex("foo");
}
};
t.start();
t.join(500);
Assert.assertTrue(t.isAlive());
Assert.assertEquals(m.getSemaphore("foo").getRequestingThreads(), Arrays.asList(t));
m.releaseMutex("foo");
t.join(1000);
Assert.assertFalse(t.isAlive());
Assert.assertEquals(m.getAllSemaphores(), Collections.emptyMap());
}
public static class SampleWithMutexesDelegatingMixin implements WithMutexes {
/* other behaviour would typically go here... */
WithMutexes mutexSupport = new MutexSupport();
@Override
public void acquireMutex(String mutexId, String description) throws InterruptedException {
mutexSupport.acquireMutex(mutexId, description);
}
@Override
public boolean tryAcquireMutex(String mutexId, String description) {
return mutexSupport.tryAcquireMutex(mutexId, description);
}
@Override
public void releaseMutex(String mutexId) {
mutexSupport.releaseMutex(mutexId);
}
@Override
public boolean hasMutex(String mutexId) {
return mutexSupport.hasMutex(mutexId);
}
}
@Test
public void testDelegatingMixinPattern() throws InterruptedException {
WithMutexes m = new SampleWithMutexesDelegatingMixin();
m.acquireMutex("foo", "sample");
Assert.assertTrue(m.hasMutex("foo"));
Assert.assertFalse(m.hasMutex("bar"));
m.releaseMutex("foo");
Assert.assertFalse(m.hasMutex("foo"));
}
}