/*
* Copyright 2000-2015 JetBrains s.r.o.
*
* 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.
*/
/*
* Created by IntelliJ IDEA.
* User: Alexey
* Date: 18.12.2006
* Time: 20:18:31
*/
package com.intellij.util.containers;
import com.intellij.openapi.util.Comparing;
import gnu.trove.TObjectHashingStrategy;
import org.jetbrains.annotations.NotNull;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
/**
* Concurrent map with weak keys and weak values.
* Null keys are NOT allowed
* Null values are NOT allowed
* @deprecated Use {@link ContainerUtil#createConcurrentWeakKeyWeakValueMap()} instead
*/
class ConcurrentWeakKeyWeakValueHashMap<K, V> extends ConcurrentWeakKeySoftValueHashMap<K,V> {
ConcurrentWeakKeyWeakValueHashMap(int initialCapacity,
float loadFactor,
int concurrencyLevel,
@NotNull final TObjectHashingStrategy<K> hashingStrategy) {
super(initialCapacity, loadFactor, concurrencyLevel, hashingStrategy);
}
private static class WeakValue<K, V> extends WeakReference<V> implements ValueReference<K,V> {
@NotNull private volatile KeyReference<K, V> myKeyReference; // can't make it final because of circular dependency of KeyReference to ValueReference
private final int myHash; // Hashcode of key, stored here since the key may be tossed by the GC
private WeakValue(@NotNull V value, @NotNull ReferenceQueue<V> queue) {
super(value, queue);
myHash = value.hashCode();
}
// MUST work with gced references too for the code in processQueue to work
@Override
public final boolean equals(final Object o) {
if (this == o) return true;
if (o == null) return false;
ValueReference that = (ValueReference)o;
return myHash == that.hashCode() && Comparing.equal(get(), that.get());
}
@Override
public final int hashCode() {
return myHash;
}
@NotNull
@Override
public KeyReference<K, V> getKeyReference() {
return myKeyReference;
}
}
@Override
@NotNull
protected KeyReference<K,V> createKeyReference(@NotNull K k, @NotNull final V v) {
final ValueReference<K, V> valueReference = createValueReference(v, myValueQueue);
WeakKey<K, V> keyReference = new WeakKey<K, V>(k, valueReference, myHashingStrategy, myKeyQueue);
if (valueReference instanceof WeakValue) {
((WeakValue)valueReference).myKeyReference = keyReference;
}
return keyReference;
}
@Override
@NotNull
protected ValueReference<K, V> createValueReference(@NotNull V value, @NotNull ReferenceQueue<V> queue) {
return new WeakValue<K, V>(value, queue);
}
}