com.liferay.portal.cache.MVCCPortalCache 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.portal.cache;
import com.liferay.portal.kernel.model.MVCCModel;
import java.io.Serializable;
/**
* @author Shuyang Zhou
*/
public class MVCCPortalCache
extends PortalCacheWrapper {
public MVCCPortalCache(LowLevelCache lowLevelCache) {
super(lowLevelCache);
_lowLevelCache = lowLevelCache;
}
@Override
public void put(K key, V value) {
put(key, value, DEFAULT_TIME_TO_LIVE);
}
@Override
public void put(K key, V value, int timeToLive) {
while (true) {
V oldValue = _lowLevelCache.get(key);
if (oldValue == null) {
oldValue = _lowLevelCache.putIfAbsent(key, value, timeToLive);
if (oldValue == null) {
return;
}
}
if (value.getMvccVersion() <= oldValue.getMvccVersion()) {
return;
}
if (_lowLevelCache.replace(key, oldValue, value, timeToLive)) {
return;
}
}
}
private final LowLevelCache _lowLevelCache;
}