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/*
* Copyright (C) 2007 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.collect;
import java.util.ArrayDeque;
import java.util.Collection;
import java.util.Iterator;
import java.util.Queue;
import junit.framework.TestCase;
/**
* Tests for {@link Synchronized#queue} and {@link Queues#synchronizedQueue}.
*
* @author Kurt Alfred Kluever
*/
public class SynchronizedQueueTest extends TestCase {
protected Queue<String> create() {
TestQueue<String> inner = new TestQueue<>();
Queue<String> outer = Synchronized.queue(inner, inner.mutex);
outer.add("foo"); // necessary because we try to remove elements later on
return outer;
}
private static final class TestQueue<E> implements Queue<E> {
private final Queue<E> delegate = Lists.newLinkedList();
public final Object mutex = new Integer(1); // something Serializable
@Override
public boolean offer(E o) {
assertTrue(Thread.holdsLock(mutex));
return delegate.offer(o);
}
@Override
public E poll() {
assertTrue(Thread.holdsLock(mutex));
return delegate.poll();
}
@Override
public E remove() {
assertTrue(Thread.holdsLock(mutex));
return delegate.remove();
}
@Override
public boolean remove(Object object) {
assertTrue(Thread.holdsLock(mutex));
return delegate.remove(object);
}
@Override
public E peek() {
assertTrue(Thread.holdsLock(mutex));
return delegate.peek();
}
@Override
public E element() {
assertTrue(Thread.holdsLock(mutex));
return delegate.element();
}
@Override
public Iterator<E> iterator() {
// We explicitly don't lock for iterator()
assertFalse(Thread.holdsLock(mutex));
return delegate.iterator();
}
@Override
public int size() {
assertTrue(Thread.holdsLock(mutex));
return delegate.size();
}
@Override
public boolean removeAll(Collection<?> collection) {
assertTrue(Thread.holdsLock(mutex));
return delegate.removeAll(collection);
}
@Override
public boolean isEmpty() {
assertTrue(Thread.holdsLock(mutex));
return delegate.isEmpty();
}
@Override
public boolean contains(Object object) {
assertTrue(Thread.holdsLock(mutex));
return delegate.contains(object);
}
@Override
public boolean add(E element) {
assertTrue(Thread.holdsLock(mutex));
return delegate.add(element);
}
@Override
public boolean containsAll(Collection<?> collection) {
assertTrue(Thread.holdsLock(mutex));
return delegate.containsAll(collection);
}
@Override
public boolean addAll(Collection<? extends E> collection) {
assertTrue(Thread.holdsLock(mutex));
return delegate.addAll(collection);
}
@Override
public boolean retainAll(Collection<?> collection) {
assertTrue(Thread.holdsLock(mutex));
return delegate.retainAll(collection);
}
@Override
public void clear() {
assertTrue(Thread.holdsLock(mutex));
delegate.clear();
}
@Override
public Object[] toArray() {
assertTrue(Thread.holdsLock(mutex));
return delegate.toArray();
}
@Override
public <T> T[] toArray(T[] array) {
assertTrue(Thread.holdsLock(mutex));
return delegate.toArray(array);
}
private static final long serialVersionUID = 0;
}
@SuppressWarnings("CheckReturnValue")
public void testHoldsLockOnAllOperations() {
create().element();
create().offer("foo");
create().peek();
create().poll();
create().remove();
create().add("foo");
create().addAll(ImmutableList.of("foo"));
create().clear();
create().contains("foo");
create().containsAll(ImmutableList.of("foo"));
create().equals(new ArrayDeque<>(ImmutableList.of("foo")));
create().hashCode();
create().isEmpty();
create().iterator();
create().remove("foo");
create().removeAll(ImmutableList.of("foo"));
create().retainAll(ImmutableList.of("foo"));
create().size();
create().toArray();
create().toArray(new String[] {"foo"});
}
}
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