/*
* 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.giraph.zk;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.giraph.time.Time;
import org.apache.giraph.zk.BspEvent;
import org.apache.giraph.zk.PredicateLock;
import org.apache.hadoop.util.Progressable;
import org.junit.Before;
import org.junit.Test;
/**
* Ensure that PredicateLock objects work correctly.
*/
public class TestPredicateLock {
/** How many times was progress called? */
private AtomicInteger progressCalled = new AtomicInteger(0);
private static class SignalThread extends Thread {
private final BspEvent event;
public SignalThread(BspEvent event) {
this.event = event;
}
public void run() {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
}
event.signal();
}
}
private Progressable stubContext;
private Progressable getStubProgressable() {
if (stubContext == null)
stubContext = new Progressable() {
@Override
public void progress() {
progressCalled.incrementAndGet();
}
};
return stubContext;
}
@Before
public void setUp() {
progressCalled.set(0);
}
/**
* SMake sure the the event is not signaled.
*/
@Test
public void testWaitMsecsNoEvent() {
Time mockTime = mock(Time.class);
when(mockTime.getMilliseconds()).
thenReturn(0L).thenReturn(2L);
BspEvent event = new PredicateLock(getStubProgressable(), 1, mockTime);
boolean gotPredicate = event.waitMsecs(1);
assertFalse(gotPredicate);
assertEquals(0, progressCalled.get());
when(mockTime.getMilliseconds()).
thenReturn(0L).thenReturn(0L).thenReturn(2L);
gotPredicate = event.waitMsecs(1);
assertFalse(gotPredicate);
assertEquals(1, progressCalled.get());
}
/**
* Single threaded case where the event is signaled.
*/
@Test
public void testEvent() {
Time mockTime = mock(Time.class);
when(mockTime.getMilliseconds()).
thenReturn(0L).thenReturn(2L);
BspEvent event = new PredicateLock(getStubProgressable(), 1, mockTime);
event.signal();
boolean gotPredicate = event.waitMsecs(2);
assertTrue(gotPredicate);
event.reset();
when(mockTime.getMilliseconds()).
thenReturn(0L).thenReturn(2L);
gotPredicate = event.waitMsecs(0);
assertFalse(gotPredicate);
}
/**
* Thread signaled test for {@link PredicateLock#waitForever()}
*/
@Test
public void testWaitForever() {
BspEvent event = new PredicateLock(getStubProgressable());
Thread signalThread = new SignalThread(event);
signalThread.start();
event.waitForever();
try {
signalThread.join();
} catch (InterruptedException e) {
}
assertTrue(event.waitMsecs(0));
}
/**
* Thread signaled test to make sure the the event is signaled correctly
*
* @throws InterruptedException
*/
@Test
public void testWaitMsecs() {
BspEvent event = new PredicateLock(getStubProgressable());
Thread signalThread = new SignalThread(event);
signalThread.start();
boolean gotPredicate = event.waitMsecs(2000);
assertTrue(gotPredicate);
try {
signalThread.join();
} catch (InterruptedException e) {
}
gotPredicate = event.waitMsecs(0);
assertTrue(gotPredicate);
}
}