1/*
2 * Copyright (C) 2007 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect;
18
19import static com.google.common.base.Preconditions.checkNotNull;
20
21import com.google.common.testing.SerializableTester;
22
23import java.io.Serializable;
24import java.util.Collection;
25import java.util.HashSet;
26import java.util.Set;
27
28import javax.annotation.Nullable;
29
30/**
31 * Tests for {@code Synchronized#set}.
32 *
33 * @author Mike Bostock
34 */
35public class SynchronizedSetTest extends AbstractCollectionTest {
36  public final Object mutex = new Integer(1); // something Serializable
37
38  @Override protected <E> Set<E> create() {
39    TestSet<E> inner = new TestSet<E>(new HashSet<E>(), mutex);
40    Set<E> outer = Synchronized.set(inner, inner.mutex);
41    return outer;
42  }
43
44  @Override public void testNullPointerExceptions() throws Exception {
45    /* Skip this test, as SynchronizedSet is not a public class. */
46  }
47
48  public void testSerialization() {
49    SerializableTester.reserializeAndAssert(create());
50  }
51
52  static class TestSet<E> extends ForwardingSet<E> implements Serializable {
53    final Set<E> delegate;
54    public final Object mutex;
55
56    public TestSet(Set<E> delegate, Object mutex) {
57      checkNotNull(mutex);
58      this.delegate = delegate;
59      this.mutex = mutex;
60    }
61
62    @Override protected Set<E> delegate() {
63      return delegate;
64    }
65
66    @Override public String toString() {
67      assertTrue(Thread.holdsLock(mutex));
68      return super.toString();
69    }
70
71    @Override public boolean equals(@Nullable Object o) {
72      assertTrue(Thread.holdsLock(mutex));
73      return super.equals(o);
74    }
75
76    @Override public int hashCode() {
77      assertTrue(Thread.holdsLock(mutex));
78      return super.hashCode();
79    }
80
81    @Override public boolean add(@Nullable E o) {
82      assertTrue(Thread.holdsLock(mutex));
83      return super.add(o);
84    }
85
86    @Override public boolean addAll(Collection<? extends E> c) {
87      assertTrue(Thread.holdsLock(mutex));
88      return super.addAll(c);
89    }
90
91    @Override public void clear() {
92      assertTrue(Thread.holdsLock(mutex));
93      super.clear();
94    }
95
96    @Override public boolean contains(@Nullable Object o) {
97      assertTrue(Thread.holdsLock(mutex));
98      return super.contains(o);
99    }
100
101    @Override public boolean containsAll(Collection<?> c) {
102      assertTrue(Thread.holdsLock(mutex));
103      return super.containsAll(c);
104    }
105
106    @Override public boolean isEmpty() {
107      assertTrue(Thread.holdsLock(mutex));
108      return super.isEmpty();
109    }
110
111    /* Don't test iterator(); it may or may not hold the mutex. */
112
113    @Override public boolean remove(@Nullable Object o) {
114      assertTrue(Thread.holdsLock(mutex));
115      return super.remove(o);
116    }
117
118    @Override public boolean removeAll(Collection<?> c) {
119      assertTrue(Thread.holdsLock(mutex));
120      return super.removeAll(c);
121    }
122
123    @Override public boolean retainAll(Collection<?> c) {
124      assertTrue(Thread.holdsLock(mutex));
125      return super.retainAll(c);
126    }
127
128    @Override public int size() {
129      assertTrue(Thread.holdsLock(mutex));
130      return super.size();
131    }
132
133    @Override public Object[] toArray() {
134      assertTrue(Thread.holdsLock(mutex));
135      return super.toArray();
136    }
137
138    @Override public <T> T[] toArray(T[] a) {
139      assertTrue(Thread.holdsLock(mutex));
140      return super.toArray(a);
141    }
142
143    private static final long serialVersionUID = 0;
144  }
145}
146