/*
* Copyright (c) 2005-2011, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you 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 org.wso2.carbon.clustering.hazelcast.jsr107.eviction;
import org.wso2.carbon.clustering.hazelcast.jsr107.CacheEntry;
import org.wso2.carbon.clustering.hazelcast.jsr107.CacheImpl;
import java.util.Collection;
import java.util.Random;
/**
* TODO: class description
*/
public class RandomEvictionAlgorithm implements EvictionAlgorithm {
private static Random random = new Random();
@SuppressWarnings("unchecked")
public void evict(CacheImpl cache) {
CacheEntry lruCacheEntry = null;
Collection all = cache.getAll();
int evictionIndex = random.nextInt(all.size());
int index = 0;
for (Object anAll : all) {
CacheEntry cacheEntry = (CacheEntry) anAll;
if (index == evictionIndex) {
lruCacheEntry = cacheEntry;
break;
}
index++;
}
if (lruCacheEntry != null) {
cache.evict(lruCacheEntry.getKey());
}
}
}