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/*
* Copyright (C) 2014 The Guava Authors
*
* 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.
*/
package com.google.common.util.concurrent;
import static com.google.common.util.concurrent.GeneratedMonitorTest.startThread;
import static com.google.common.util.concurrent.Uninterruptibles.joinUninterruptibly;
import static org.junit.Assert.assertThrows;
import com.google.common.util.concurrent.GeneratedMonitorTest.FlagGuard;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import junit.framework.TestCase;
/**
* Supplemental tests for {@link Monitor}.
*
* <p>This test class contains various test cases that don't fit into the test case generation in
* {@link GeneratedMonitorTest}.
*
* @author Justin T. Sampson
*/
public class SupplementalMonitorTest extends TestCase {
public void testLeaveWithoutEnterThrowsIMSE() {
Monitor monitor = new Monitor();
assertThrows(IllegalMonitorStateException.class, () -> monitor.leave());
}
public void testGetWaitQueueLengthWithWrongMonitorThrowsIMSE() {
Monitor monitor1 = new Monitor();
Monitor monitor2 = new Monitor();
FlagGuard guard = new FlagGuard(monitor2);
assertThrows(IllegalMonitorStateException.class, () -> monitor1.getWaitQueueLength(guard));
}
public void testHasWaitersWithWrongMonitorThrowsIMSE() {
Monitor monitor1 = new Monitor();
Monitor monitor2 = new Monitor();
FlagGuard guard = new FlagGuard(monitor2);
assertThrows(IllegalMonitorStateException.class, () -> monitor1.hasWaiters(guard));
}
public void testNullMonitorInGuardConstructorThrowsNPE() {
assertThrows(NullPointerException.class, () -> new FlagGuard(null));
}
public void testIsFair() {
assertTrue(new Monitor(true).isFair());
assertFalse(new Monitor(false).isFair());
}
public void testOccupiedMethods() {
Monitor monitor = new Monitor();
verifyOccupiedMethodsInCurrentThread(monitor, false, false, 0);
verifyOccupiedMethodsInAnotherThread(monitor, false, false, 0);
monitor.enter();
try {
verifyOccupiedMethodsInCurrentThread(monitor, true, true, 1);
verifyOccupiedMethodsInAnotherThread(monitor, true, false, 0);
monitor.enter();
try {
verifyOccupiedMethodsInCurrentThread(monitor, true, true, 2);
verifyOccupiedMethodsInAnotherThread(monitor, true, false, 0);
} finally {
monitor.leave();
}
verifyOccupiedMethodsInCurrentThread(monitor, true, true, 1);
verifyOccupiedMethodsInAnotherThread(monitor, true, false, 0);
} finally {
monitor.leave();
}
verifyOccupiedMethodsInCurrentThread(monitor, false, false, 0);
verifyOccupiedMethodsInAnotherThread(monitor, false, false, 0);
}
private static void verifyOccupiedMethodsInCurrentThread(
Monitor monitor,
boolean expectedIsOccupied,
boolean expectedIsOccupiedByCurrentThread,
int expectedOccupiedDepth) {
assertEquals(expectedIsOccupied, monitor.isOccupied());
assertEquals(expectedIsOccupiedByCurrentThread, monitor.isOccupiedByCurrentThread());
assertEquals(expectedOccupiedDepth, monitor.getOccupiedDepth());
}
private static void verifyOccupiedMethodsInAnotherThread(
final Monitor monitor,
boolean expectedIsOccupied,
boolean expectedIsOccupiedByCurrentThread,
int expectedOccupiedDepth) {
final AtomicBoolean actualIsOccupied = new AtomicBoolean();
final AtomicBoolean actualIsOccupiedByCurrentThread = new AtomicBoolean();
final AtomicInteger actualOccupiedDepth = new AtomicInteger();
final AtomicReference<Throwable> thrown = new AtomicReference<>();
joinUninterruptibly(
startThread(
new Runnable() {
@Override
public void run() {
try {
actualIsOccupied.set(monitor.isOccupied());
actualIsOccupiedByCurrentThread.set(monitor.isOccupiedByCurrentThread());
actualOccupiedDepth.set(monitor.getOccupiedDepth());
} catch (Throwable t) {
thrown.set(t);
}
}
}));
assertNull(thrown.get());
assertEquals(expectedIsOccupied, actualIsOccupied.get());
assertEquals(expectedIsOccupiedByCurrentThread, actualIsOccupiedByCurrentThread.get());
assertEquals(expectedOccupiedDepth, actualOccupiedDepth.get());
}
}
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