com.liferay.petra.concurrent.ConcurrentReferenceKeyHashMap Maven / Gradle / Ivy
/**
* Copyright (c) 2000-present Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
package com.liferay.petra.concurrent;
import com.liferay.petra.memory.FinalizeAction;
import com.liferay.petra.memory.FinalizeManager;
import java.lang.ref.Reference;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* @author Shuyang Zhou
*/
public class ConcurrentReferenceKeyHashMap
extends ConcurrentMapperHashMap, V, V> {
public ConcurrentReferenceKeyHashMap(
ConcurrentMap, V> innerConcurrentMap,
FinalizeManager.ReferenceFactory referenceFactory) {
super(innerConcurrentMap);
_referenceFactory = referenceFactory;
}
public ConcurrentReferenceKeyHashMap(
FinalizeManager.ReferenceFactory referenceFactory) {
this(new ConcurrentHashMap, V>(), referenceFactory);
}
public ConcurrentReferenceKeyHashMap(
int initialCapacity,
FinalizeManager.ReferenceFactory referenceFactory) {
this(
new ConcurrentHashMap, V>(initialCapacity),
referenceFactory);
}
public ConcurrentReferenceKeyHashMap(
int initialCapacity, float loadFactor, int concurrencyLevel,
FinalizeManager.ReferenceFactory referenceFactory) {
this(
new ConcurrentHashMap, V>(
initialCapacity, loadFactor, concurrencyLevel),
referenceFactory);
}
public ConcurrentReferenceKeyHashMap(
Map map,
FinalizeManager.ReferenceFactory referenceFactory) {
this(new ConcurrentHashMap, V>(), referenceFactory);
putAll(map);
}
@Override
protected Reference mapKey(K key) {
return FinalizeManager.register(
key, _keyFinalizeAction, _referenceFactory);
}
@Override
protected Reference mapKeyForQuery(K key) {
return _referenceFactory.createReference(key, null);
}
@Override
protected V mapValue(K key, V value) {
return value;
}
@Override
protected V mapValueForQuery(V value) {
return value;
}
@Override
protected K unmapKey(Reference reference) {
K key = reference.get();
reference.clear();
return key;
}
@Override
protected K unmapKeyForQuery(Reference reference) {
return reference.get();
}
@Override
protected V unmapValue(V value) {
return value;
}
@Override
protected V unmapValueForQuery(V value) {
return value;
}
private final FinalizeAction _keyFinalizeAction = new FinalizeAction() {
@Override
public void doFinalize(Reference reference) {
innerConcurrentMap.remove(reference);
}
};
private final FinalizeManager.ReferenceFactory _referenceFactory;
}