/* | |
* Copyright 1999-2012 Alibaba Group. | |
* | |
* 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 com.alibaba.dubbo.cache.support.lru; | |
import java.util.LinkedHashMap; | |
import java.util.Map; | |
import java.util.Map.Entry; | |
import com.alibaba.dubbo.cache.Cache; | |
import com.alibaba.dubbo.common.URL; | |
/** | |
* LruCache | |
* | |
* @author william.liangf | |
*/ | |
public class LruCache implements Cache { | |
private final Map<Object, Object> store; | |
public LruCache(URL url) { | |
final int max = url.getParameter("cache.size", 1000); | |
this.store = new LinkedHashMap<Object, Object>() { | |
private static final long serialVersionUID = -3834209229668463829L; | |
@Override | |
protected boolean removeEldestEntry(Entry<Object, Object> eldest) { | |
return size() > max; | |
} | |
}; | |
} | |
public void put(Object key, Object value) { | |
synchronized (store) { | |
store.put(key, value); | |
} | |
} | |
public Object get(Object key) { | |
synchronized (store) { | |
return store.get(key); | |
} | |
} | |
} |