grails.plugin.cache.GrailsConcurrentLinkedMapCacheManager.java Source code

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Here is the source code for grails.plugin.cache.GrailsConcurrentLinkedMapCacheManager.java

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/* Copyright 2012-2013 SpringSource.
 *
 * 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 grails.plugin.cache;

import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import com.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap;

import org.springframework.cache.Cache;

/**
 * Based on com.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap.
 *
 * @author Jakob Drangmeister
 */
public class GrailsConcurrentLinkedMapCacheManager implements GrailsCacheManager {

    protected final ConcurrentMap<String, Cache> cacheMap = new ConcurrentHashMap<String, Cache>();

    public Collection<String> getCacheNames() {
        return Collections.unmodifiableSet(cacheMap.keySet());
    }

    public Cache getCache(String name) {
        return getCache(name, 10000);
    }

    public Cache getCache(String name, int capacity) {
        Cache cache = cacheMap.get(name);
        if (cache == null) {
            cache = createConcurrentLinkedMapCache(name, capacity);
            Cache existing = cacheMap.putIfAbsent(name, cache);
            if (existing != null) {
                cache = existing;
            }
        }
        return cache;
    }

    public boolean cacheExists(String name) {
        return getCacheNames().contains(name);
    }

    public boolean destroyCache(String name) {
        return cacheMap.remove(name) != null;
    }

    protected GrailsConcurrentLinkedMapCache createConcurrentLinkedMapCache(String name, long capacity) {
        return new GrailsConcurrentLinkedMapCache(name, capacity);
    }
}