/
Synchronized.java
2108 lines (1800 loc) · 53.4 KB
/
Synchronized.java
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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.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.annotations.VisibleForTesting;
import com.google.j2objc.annotations.RetainedWith;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Collection;
import java.util.Comparator;
import java.util.Deque;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.Queue;
import java.util.RandomAccess;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Synchronized collection views. The returned synchronized collection views are serializable if the
* backing collection and the mutex are serializable.
*
* <p>If {@code null} is passed as the {@code mutex} parameter to any of this class's top-level
* methods or inner class constructors, the created object uses itself as the synchronization mutex.
*
* <p>This class should be used by other collection classes only.
*
* @author Mike Bostock
* @author Jared Levy
*/
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
/*
* I have decided not to bother adding @ParametricNullness annotations in this class. Adding them is
* a lot of busy work, and the annotation matters only when the APIs to be annotated are visible to
* Kotlin code. In this class, nothing is publicly visible (nor exposed indirectly through a
* publicly visible subclass), and I doubt any of our current or future Kotlin extensions for the
* package will refer to the class. Plus, @ParametricNullness is only a temporary workaround,
* anyway, so we just need to get by without the annotations here until Kotlin better understands
* our other nullness annotations.
*/
final class Synchronized {
private Synchronized() {}
static class SynchronizedObject implements Serializable {
final Object delegate;
final Object mutex;
SynchronizedObject(Object delegate, @CheckForNull Object mutex) {
this.delegate = checkNotNull(delegate);
this.mutex = (mutex == null) ? this : mutex;
}
Object delegate() {
return delegate;
}
// No equals and hashCode; see ForwardingObject for details.
@Override
public String toString() {
synchronized (mutex) {
return delegate.toString();
}
}
// Serialization invokes writeObject only when it's private.
// The SynchronizedObject subclasses don't need a writeObject method since
// they don't contain any non-transient member variables, while the
// following writeObject() handles the SynchronizedObject members.
@GwtIncompatible // java.io.ObjectOutputStream
@J2ktIncompatible
private void writeObject(ObjectOutputStream stream) throws IOException {
synchronized (mutex) {
stream.defaultWriteObject();
}
}
@GwtIncompatible // not needed in emulated source
@J2ktIncompatible
private static final long serialVersionUID = 0;
}
private static <E extends @Nullable Object> Collection<E> collection(
Collection<E> collection, @CheckForNull Object mutex) {
return new SynchronizedCollection<>(collection, mutex);
}
@VisibleForTesting
static class SynchronizedCollection<E extends @Nullable Object> extends SynchronizedObject
implements Collection<E> {
private SynchronizedCollection(Collection<E> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@SuppressWarnings("unchecked")
@Override
Collection<E> delegate() {
return (Collection<E>) super.delegate();
}
@Override
public boolean add(E e) {
synchronized (mutex) {
return delegate().add(e);
}
}
@Override
public boolean addAll(Collection<? extends E> c) {
synchronized (mutex) {
return delegate().addAll(c);
}
}
@Override
public void clear() {
synchronized (mutex) {
delegate().clear();
}
}
@Override
public boolean contains(@CheckForNull Object o) {
synchronized (mutex) {
return delegate().contains(o);
}
}
@Override
public boolean containsAll(Collection<?> c) {
synchronized (mutex) {
return delegate().containsAll(c);
}
}
@Override
public boolean isEmpty() {
synchronized (mutex) {
return delegate().isEmpty();
}
}
@Override
public Iterator<E> iterator() {
return delegate().iterator(); // manually synchronized
}
@Override
public boolean remove(@CheckForNull Object o) {
synchronized (mutex) {
return delegate().remove(o);
}
}
@Override
public boolean removeAll(Collection<?> c) {
synchronized (mutex) {
return delegate().removeAll(c);
}
}
@Override
public boolean retainAll(Collection<?> c) {
synchronized (mutex) {
return delegate().retainAll(c);
}
}
@Override
public int size() {
synchronized (mutex) {
return delegate().size();
}
}
@Override
public @Nullable Object[] toArray() {
synchronized (mutex) {
return delegate().toArray();
}
}
@Override
@SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
public <T extends @Nullable Object> T[] toArray(T[] a) {
synchronized (mutex) {
return delegate().toArray(a);
}
}
private static final long serialVersionUID = 0;
}
@VisibleForTesting
static <E extends @Nullable Object> Set<E> set(Set<E> set, @CheckForNull Object mutex) {
return new SynchronizedSet<>(set, mutex);
}
static class SynchronizedSet<E extends @Nullable Object> extends SynchronizedCollection<E>
implements Set<E> {
SynchronizedSet(Set<E> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@Override
Set<E> delegate() {
return (Set<E>) super.delegate();
}
@Override
public boolean equals(@CheckForNull Object o) {
if (o == this) {
return true;
}
synchronized (mutex) {
return delegate().equals(o);
}
}
@Override
public int hashCode() {
synchronized (mutex) {
return delegate().hashCode();
}
}
private static final long serialVersionUID = 0;
}
private static <E extends @Nullable Object> SortedSet<E> sortedSet(
SortedSet<E> set, @CheckForNull Object mutex) {
return new SynchronizedSortedSet<>(set, mutex);
}
static class SynchronizedSortedSet<E extends @Nullable Object> extends SynchronizedSet<E>
implements SortedSet<E> {
SynchronizedSortedSet(SortedSet<E> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@Override
SortedSet<E> delegate() {
return (SortedSet<E>) super.delegate();
}
@Override
@CheckForNull
public Comparator<? super E> comparator() {
synchronized (mutex) {
return delegate().comparator();
}
}
@Override
public SortedSet<E> subSet(E fromElement, E toElement) {
synchronized (mutex) {
return sortedSet(delegate().subSet(fromElement, toElement), mutex);
}
}
@Override
public SortedSet<E> headSet(E toElement) {
synchronized (mutex) {
return sortedSet(delegate().headSet(toElement), mutex);
}
}
@Override
public SortedSet<E> tailSet(E fromElement) {
synchronized (mutex) {
return sortedSet(delegate().tailSet(fromElement), mutex);
}
}
@Override
public E first() {
synchronized (mutex) {
return delegate().first();
}
}
@Override
public E last() {
synchronized (mutex) {
return delegate().last();
}
}
private static final long serialVersionUID = 0;
}
private static <E extends @Nullable Object> List<E> list(
List<E> list, @CheckForNull Object mutex) {
return (list instanceof RandomAccess)
? new SynchronizedRandomAccessList<E>(list, mutex)
: new SynchronizedList<E>(list, mutex);
}
static class SynchronizedList<E extends @Nullable Object> extends SynchronizedCollection<E>
implements List<E> {
SynchronizedList(List<E> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@Override
List<E> delegate() {
return (List<E>) super.delegate();
}
@Override
public void add(int index, E element) {
synchronized (mutex) {
delegate().add(index, element);
}
}
@Override
public boolean addAll(int index, Collection<? extends E> c) {
synchronized (mutex) {
return delegate().addAll(index, c);
}
}
@Override
public E get(int index) {
synchronized (mutex) {
return delegate().get(index);
}
}
@Override
public int indexOf(@CheckForNull Object o) {
synchronized (mutex) {
return delegate().indexOf(o);
}
}
@Override
public int lastIndexOf(@CheckForNull Object o) {
synchronized (mutex) {
return delegate().lastIndexOf(o);
}
}
@Override
public ListIterator<E> listIterator() {
return delegate().listIterator(); // manually synchronized
}
@Override
public ListIterator<E> listIterator(int index) {
return delegate().listIterator(index); // manually synchronized
}
@Override
public E remove(int index) {
synchronized (mutex) {
return delegate().remove(index);
}
}
@Override
public E set(int index, E element) {
synchronized (mutex) {
return delegate().set(index, element);
}
}
@Override
public List<E> subList(int fromIndex, int toIndex) {
synchronized (mutex) {
return list(delegate().subList(fromIndex, toIndex), mutex);
}
}
@Override
public boolean equals(@CheckForNull Object o) {
if (o == this) {
return true;
}
synchronized (mutex) {
return delegate().equals(o);
}
}
@Override
public int hashCode() {
synchronized (mutex) {
return delegate().hashCode();
}
}
private static final long serialVersionUID = 0;
}
static final class SynchronizedRandomAccessList<E extends @Nullable Object>
extends SynchronizedList<E> implements RandomAccess {
SynchronizedRandomAccessList(List<E> list, @CheckForNull Object mutex) {
super(list, mutex);
}
private static final long serialVersionUID = 0;
}
static <E extends @Nullable Object> Multiset<E> multiset(
Multiset<E> multiset, @CheckForNull Object mutex) {
if (multiset instanceof SynchronizedMultiset || multiset instanceof ImmutableMultiset) {
return multiset;
}
return new SynchronizedMultiset<>(multiset, mutex);
}
static final class SynchronizedMultiset<E extends @Nullable Object>
extends SynchronizedCollection<E> implements Multiset<E> {
@CheckForNull transient Set<E> elementSet;
@CheckForNull transient Set<Multiset.Entry<E>> entrySet;
SynchronizedMultiset(Multiset<E> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@Override
Multiset<E> delegate() {
return (Multiset<E>) super.delegate();
}
@Override
public int count(@CheckForNull Object o) {
synchronized (mutex) {
return delegate().count(o);
}
}
@Override
public int add(@ParametricNullness E e, int n) {
synchronized (mutex) {
return delegate().add(e, n);
}
}
@Override
public int remove(@CheckForNull Object o, int n) {
synchronized (mutex) {
return delegate().remove(o, n);
}
}
@Override
public int setCount(@ParametricNullness E element, int count) {
synchronized (mutex) {
return delegate().setCount(element, count);
}
}
@Override
public boolean setCount(@ParametricNullness E element, int oldCount, int newCount) {
synchronized (mutex) {
return delegate().setCount(element, oldCount, newCount);
}
}
@Override
public Set<E> elementSet() {
synchronized (mutex) {
if (elementSet == null) {
elementSet = typePreservingSet(delegate().elementSet(), mutex);
}
return elementSet;
}
}
@Override
public Set<Multiset.Entry<E>> entrySet() {
synchronized (mutex) {
if (entrySet == null) {
entrySet = typePreservingSet(delegate().entrySet(), mutex);
}
return entrySet;
}
}
@Override
public boolean equals(@CheckForNull Object o) {
if (o == this) {
return true;
}
synchronized (mutex) {
return delegate().equals(o);
}
}
@Override
public int hashCode() {
synchronized (mutex) {
return delegate().hashCode();
}
}
private static final long serialVersionUID = 0;
}
static <K extends @Nullable Object, V extends @Nullable Object> Multimap<K, V> multimap(
Multimap<K, V> multimap, @CheckForNull Object mutex) {
if (multimap instanceof SynchronizedMultimap || multimap instanceof BaseImmutableMultimap) {
return multimap;
}
return new SynchronizedMultimap<>(multimap, mutex);
}
static class SynchronizedMultimap<K extends @Nullable Object, V extends @Nullable Object>
extends SynchronizedObject implements Multimap<K, V> {
@CheckForNull transient Set<K> keySet;
@CheckForNull transient Collection<V> valuesCollection;
@CheckForNull transient Collection<Map.Entry<K, V>> entries;
@CheckForNull transient Map<K, Collection<V>> asMap;
@CheckForNull transient Multiset<K> keys;
@SuppressWarnings("unchecked")
@Override
Multimap<K, V> delegate() {
return (Multimap<K, V>) super.delegate();
}
SynchronizedMultimap(Multimap<K, V> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@Override
public int size() {
synchronized (mutex) {
return delegate().size();
}
}
@Override
public boolean isEmpty() {
synchronized (mutex) {
return delegate().isEmpty();
}
}
@Override
public boolean containsKey(@CheckForNull Object key) {
synchronized (mutex) {
return delegate().containsKey(key);
}
}
@Override
public boolean containsValue(@CheckForNull Object value) {
synchronized (mutex) {
return delegate().containsValue(value);
}
}
@Override
public boolean containsEntry(@CheckForNull Object key, @CheckForNull Object value) {
synchronized (mutex) {
return delegate().containsEntry(key, value);
}
}
@Override
public Collection<V> get(@ParametricNullness K key) {
synchronized (mutex) {
return typePreservingCollection(delegate().get(key), mutex);
}
}
@Override
public boolean put(@ParametricNullness K key, @ParametricNullness V value) {
synchronized (mutex) {
return delegate().put(key, value);
}
}
@Override
public boolean putAll(@ParametricNullness K key, Iterable<? extends V> values) {
synchronized (mutex) {
return delegate().putAll(key, values);
}
}
@Override
public boolean putAll(Multimap<? extends K, ? extends V> multimap) {
synchronized (mutex) {
return delegate().putAll(multimap);
}
}
@Override
public Collection<V> replaceValues(@ParametricNullness K key, Iterable<? extends V> values) {
synchronized (mutex) {
return delegate().replaceValues(key, values); // copy not synchronized
}
}
@Override
public boolean remove(@CheckForNull Object key, @CheckForNull Object value) {
synchronized (mutex) {
return delegate().remove(key, value);
}
}
@Override
public Collection<V> removeAll(@CheckForNull Object key) {
synchronized (mutex) {
return delegate().removeAll(key); // copy not synchronized
}
}
@Override
public void clear() {
synchronized (mutex) {
delegate().clear();
}
}
@Override
public Set<K> keySet() {
synchronized (mutex) {
if (keySet == null) {
keySet = typePreservingSet(delegate().keySet(), mutex);
}
return keySet;
}
}
@Override
public Collection<V> values() {
synchronized (mutex) {
if (valuesCollection == null) {
valuesCollection = collection(delegate().values(), mutex);
}
return valuesCollection;
}
}
@Override
public Collection<Map.Entry<K, V>> entries() {
synchronized (mutex) {
if (entries == null) {
entries = typePreservingCollection(delegate().entries(), mutex);
}
return entries;
}
}
@Override
public Map<K, Collection<V>> asMap() {
synchronized (mutex) {
if (asMap == null) {
asMap = new SynchronizedAsMap<>(delegate().asMap(), mutex);
}
return asMap;
}
}
@Override
public Multiset<K> keys() {
synchronized (mutex) {
if (keys == null) {
keys = multiset(delegate().keys(), mutex);
}
return keys;
}
}
@Override
public boolean equals(@CheckForNull Object o) {
if (o == this) {
return true;
}
synchronized (mutex) {
return delegate().equals(o);
}
}
@Override
public int hashCode() {
synchronized (mutex) {
return delegate().hashCode();
}
}
private static final long serialVersionUID = 0;
}
static <K extends @Nullable Object, V extends @Nullable Object> ListMultimap<K, V> listMultimap(
ListMultimap<K, V> multimap, @CheckForNull Object mutex) {
if (multimap instanceof SynchronizedListMultimap || multimap instanceof BaseImmutableMultimap) {
return multimap;
}
return new SynchronizedListMultimap<>(multimap, mutex);
}
static final class SynchronizedListMultimap<
K extends @Nullable Object, V extends @Nullable Object>
extends SynchronizedMultimap<K, V> implements ListMultimap<K, V> {
SynchronizedListMultimap(ListMultimap<K, V> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@Override
ListMultimap<K, V> delegate() {
return (ListMultimap<K, V>) super.delegate();
}
@Override
public List<V> get(K key) {
synchronized (mutex) {
return list(delegate().get(key), mutex);
}
}
@Override
public List<V> removeAll(@CheckForNull Object key) {
synchronized (mutex) {
return delegate().removeAll(key); // copy not synchronized
}
}
@Override
public List<V> replaceValues(K key, Iterable<? extends V> values) {
synchronized (mutex) {
return delegate().replaceValues(key, values); // copy not synchronized
}
}
private static final long serialVersionUID = 0;
}
static <K extends @Nullable Object, V extends @Nullable Object> SetMultimap<K, V> setMultimap(
SetMultimap<K, V> multimap, @CheckForNull Object mutex) {
if (multimap instanceof SynchronizedSetMultimap || multimap instanceof BaseImmutableMultimap) {
return multimap;
}
return new SynchronizedSetMultimap<>(multimap, mutex);
}
static class SynchronizedSetMultimap<K extends @Nullable Object, V extends @Nullable Object>
extends SynchronizedMultimap<K, V> implements SetMultimap<K, V> {
@CheckForNull transient Set<Map.Entry<K, V>> entrySet;
SynchronizedSetMultimap(SetMultimap<K, V> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@Override
SetMultimap<K, V> delegate() {
return (SetMultimap<K, V>) super.delegate();
}
@Override
public Set<V> get(K key) {
synchronized (mutex) {
return set(delegate().get(key), mutex);
}
}
@Override
public Set<V> removeAll(@CheckForNull Object key) {
synchronized (mutex) {
return delegate().removeAll(key); // copy not synchronized
}
}
@Override
public Set<V> replaceValues(K key, Iterable<? extends V> values) {
synchronized (mutex) {
return delegate().replaceValues(key, values); // copy not synchronized
}
}
@Override
public Set<Map.Entry<K, V>> entries() {
synchronized (mutex) {
if (entrySet == null) {
entrySet = set(delegate().entries(), mutex);
}
return entrySet;
}
}
private static final long serialVersionUID = 0;
}
static <K extends @Nullable Object, V extends @Nullable Object>
SortedSetMultimap<K, V> sortedSetMultimap(
SortedSetMultimap<K, V> multimap, @CheckForNull Object mutex) {
if (multimap instanceof SynchronizedSortedSetMultimap) {
return multimap;
}
return new SynchronizedSortedSetMultimap<>(multimap, mutex);
}
static final class SynchronizedSortedSetMultimap<
K extends @Nullable Object, V extends @Nullable Object>
extends SynchronizedSetMultimap<K, V> implements SortedSetMultimap<K, V> {
SynchronizedSortedSetMultimap(SortedSetMultimap<K, V> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@Override
SortedSetMultimap<K, V> delegate() {
return (SortedSetMultimap<K, V>) super.delegate();
}
@Override
public SortedSet<V> get(K key) {
synchronized (mutex) {
return sortedSet(delegate().get(key), mutex);
}
}
@Override
public SortedSet<V> removeAll(@CheckForNull Object key) {
synchronized (mutex) {
return delegate().removeAll(key); // copy not synchronized
}
}
@Override
public SortedSet<V> replaceValues(K key, Iterable<? extends V> values) {
synchronized (mutex) {
return delegate().replaceValues(key, values); // copy not synchronized
}
}
@Override
@CheckForNull
public Comparator<? super V> valueComparator() {
synchronized (mutex) {
return delegate().valueComparator();
}
}
private static final long serialVersionUID = 0;
}
private static <E extends @Nullable Object> Collection<E> typePreservingCollection(
Collection<E> collection, @CheckForNull Object mutex) {
if (collection instanceof SortedSet) {
return sortedSet((SortedSet<E>) collection, mutex);
}
if (collection instanceof Set) {
return set((Set<E>) collection, mutex);
}
if (collection instanceof List) {
return list((List<E>) collection, mutex);
}
return collection(collection, mutex);
}
private static <E extends @Nullable Object> Set<E> typePreservingSet(
Set<E> set, @CheckForNull Object mutex) {
if (set instanceof SortedSet) {
return sortedSet((SortedSet<E>) set, mutex);
} else {
return set(set, mutex);
}
}
static final class SynchronizedAsMapEntries<
K extends @Nullable Object, V extends @Nullable Object>
extends SynchronizedSet<Map.Entry<K, Collection<V>>> {
SynchronizedAsMapEntries(
Set<Map.Entry<K, Collection<V>>> delegate, @CheckForNull Object mutex) {
super(delegate, mutex);
}
@Override
public Iterator<Map.Entry<K, Collection<V>>> iterator() {
// Must be manually synchronized.
return new TransformedIterator<Map.Entry<K, Collection<V>>, Map.Entry<K, Collection<V>>>(
super.iterator()) {
@Override
Map.Entry<K, Collection<V>> transform(final Map.Entry<K, Collection<V>> entry) {
return new ForwardingMapEntry<K, Collection<V>>() {
@Override
protected Map.Entry<K, Collection<V>> delegate() {
return entry;
}
@Override
public Collection<V> getValue() {
return typePreservingCollection(entry.getValue(), mutex);
}
};
}
};
}
// See Collections.CheckedMap.CheckedEntrySet for details on attacks.
@Override
public @Nullable Object[] toArray() {
synchronized (mutex) {
/*
* toArrayImpl returns `@Nullable Object[]` rather than `Object[]` but only because it can
* be used with collections that may contain null. This collection never contains nulls, so
* we could return `Object[]`. But this class is private and J2KT cannot change return types
* in overrides, so we declare `@Nullable Object[]` as the return type.
*/
return ObjectArrays.toArrayImpl(delegate());
}
}
@Override
@SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations
public <T extends @Nullable Object> T[] toArray(T[] array) {
synchronized (mutex) {
return ObjectArrays.toArrayImpl(delegate(), array);
}
}
@Override
public boolean contains(@CheckForNull Object o) {
synchronized (mutex) {
return Maps.containsEntryImpl(delegate(), o);
}
}
@Override
public boolean containsAll(Collection<?> c) {
synchronized (mutex) {
return Collections2.containsAllImpl(delegate(), c);
}
}
@Override
public boolean equals(@CheckForNull Object o) {
if (o == this) {
return true;
}
synchronized (mutex) {
return Sets.equalsImpl(delegate(), o);
}
}
@Override
public boolean remove(@CheckForNull Object o) {
synchronized (mutex) {
return Maps.removeEntryImpl(delegate(), o);
}
}
@Override
public boolean removeAll(Collection<?> c) {
synchronized (mutex) {
return Iterators.removeAll(delegate().iterator(), c);
}
}
@Override
public boolean retainAll(Collection<?> c) {
synchronized (mutex) {
return Iterators.retainAll(delegate().iterator(), c);
}
}
private static final long serialVersionUID = 0;
}
@VisibleForTesting
static <K extends @Nullable Object, V extends @Nullable Object> Map<K, V> map(
Map<K, V> map, @CheckForNull Object mutex) {
return new SynchronizedMap<>(map, mutex);
}