net.ontopia.persistence.proxy.TransactionalLRULookupIndex.java Source code

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Here is the source code for net.ontopia.persistence.proxy.TransactionalLRULookupIndex.java

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/*
 * #!
 * Ontopia Engine
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * 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 net.ontopia.persistence.proxy;

import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
import org.apache.commons.collections4.map.LRUMap;

/**
 * INTERNAL: 
 */

public class TransactionalLRULookupIndex implements TransactionalLookupIndexIF, EvictableIF {

    protected CacheIF cache;
    protected Map lru;
    protected int lrusize;

    public TransactionalLRULookupIndex(CacheIF cache, int lrusize) {
        this.cache = cache;
        this.lru = Collections.synchronizedMap(new LRUMap(lrusize));
        this.lrusize = lrusize;
    }

    public Object get(Object key) {
        Object retval = cache.get(key);
        if (retval != null)
            lru.put(key, retval);
        return retval;
    }

    public Object put(Object key, Object value) {
        lru.put(key, value);
        return cache.put(key, value);
    }

    public Object remove(Object key) {
        return remove(key, true);
    }

    public void removeAll(Collection keys) {
        removeAll(keys, true);
    }

    public void commit() {
    }

    public void abort() {
    }

    // -----------------------------------------------------------------------------
    // EvictableIF
    // -----------------------------------------------------------------------------

    public Object remove(Object key, boolean notifyCluster) {
        lru.remove(key);
        return cache.remove(key, notifyCluster);
    }

    public void removeAll(Collection keys, boolean notifyCluster) {
        Iterator iter = keys.iterator();
        while (iter.hasNext()) {
            lru.remove(iter.next());
        }
        cache.removeAll(keys, notifyCluster);
    }

    public void clear(boolean notifyCluster) {
        lru.clear();
        cache.clear(notifyCluster);
    }

    // -----------------------------------------------------------------------------
    // Report
    // -----------------------------------------------------------------------------

    public void writeReport(java.io.Writer out, boolean dumpCache) throws java.io.IOException {
        cache.writeReport(out, dumpCache);
    }

}