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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 static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.collect.testing.SetTestSuiteBuilder;
import com.google.common.collect.testing.TestStringSetGenerator;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import java.io.Serializable;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import junit.framework.Test;
import junit.framework.TestCase;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Tests for {@code Synchronized#set}.
*
* @author Mike Bostock
*/
public class SynchronizedSetTest extends TestCase {
public static final Object MUTEX = new Integer(1); // something Serializable
// TODO(cpovirk): Resolve difference between branches in their choice of mutex:
// - The mainline uses `null` (even since the change in cl/99720576 was integrated).
// - The backport continued to use MUTEX.
public static Test suite() {
return SetTestSuiteBuilder.using(
new TestStringSetGenerator() {
@Override
protected Set<String> create(String[] elements) {
TestSet<String> inner = new TestSet<>(new HashSet<String>(), MUTEX);
Set<String> outer = Synchronized.set(inner, inner.mutex);
Collections.addAll(outer, elements);
return outer;
}
})
.named("Synchronized.set")
.withFeatures(
CollectionFeature.GENERAL_PURPOSE,
CollectionFeature.ALLOWS_NULL_VALUES,
CollectionSize.ANY,
CollectionFeature.SERIALIZABLE)
.createTestSuite();
}
static class TestSet<E> extends ForwardingSet<E> implements Serializable {
final Set<E> delegate;
public final Object mutex;
public TestSet(Set<E> delegate, Object mutex) {
checkNotNull(mutex);
this.delegate = delegate;
this.mutex = mutex;
}
@Override
protected Set<E> delegate() {
return delegate;
}
@Override
public String toString() {
assertTrue(Thread.holdsLock(mutex));
return super.toString();
}
@Override
public boolean equals(@Nullable Object o) {
assertTrue(Thread.holdsLock(mutex));
return super.equals(o);
}
@Override
public int hashCode() {
assertTrue(Thread.holdsLock(mutex));
return super.hashCode();
}
@Override
public boolean add(@Nullable E o) {
assertTrue(Thread.holdsLock(mutex));
return super.add(o);
}
@Override
public boolean addAll(Collection<? extends E> c) {
assertTrue(Thread.holdsLock(mutex));
return super.addAll(c);
}
@Override
public void clear() {
assertTrue(Thread.holdsLock(mutex));
super.clear();
}
@Override
public boolean contains(@Nullable Object o) {
assertTrue(Thread.holdsLock(mutex));
return super.contains(o);
}
@Override
public boolean containsAll(Collection<?> c) {
assertTrue(Thread.holdsLock(mutex));
return super.containsAll(c);
}
@Override
public boolean isEmpty() {
assertTrue(Thread.holdsLock(mutex));
return super.isEmpty();
}
/* Don't test iterator(); it may or may not hold the mutex. */
@Override
public boolean remove(@Nullable Object o) {
assertTrue(Thread.holdsLock(mutex));
return super.remove(o);
}
@Override
public boolean removeAll(Collection<?> c) {
assertTrue(Thread.holdsLock(mutex));
return super.removeAll(c);
}
@Override
public boolean retainAll(Collection<?> c) {
assertTrue(Thread.holdsLock(mutex));
return super.retainAll(c);
}
@Override
public int size() {
assertTrue(Thread.holdsLock(mutex));
return super.size();
}
@Override
public Object[] toArray() {
assertTrue(Thread.holdsLock(mutex));
return super.toArray();
}
@Override
public <T> T[] toArray(T[] a) {
assertTrue(Thread.holdsLock(mutex));
return super.toArray(a);
}
private static final long serialVersionUID = 0;
}
}
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