001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.commons.jcs3.jcache.openjpa;
020
021import org.apache.openjpa.datacache.AbstractQueryCache;
022import org.apache.openjpa.datacache.DataCacheManager;
023import org.apache.openjpa.datacache.QueryKey;
024import org.apache.openjpa.datacache.QueryResult;
025
026import javax.cache.Cache;
027import javax.cache.CacheManager;
028import java.util.Collection;
029import java.util.LinkedList;
030import java.util.concurrent.locks.Lock;
031import java.util.concurrent.locks.ReentrantLock;
032
033public class OpenJPAJCacheQueryCache extends AbstractQueryCache
034{
035    private static final String OPENJPA_PREFIX = "openjpa.querycache.";
036    private static final String QUERY_CACHE_NAME = "query";
037
038    private final Lock lock = new ReentrantLock();
039    private OpenJPAJCacheDataCacheManager manager;
040
041    @Override
042    public void initialize(final DataCacheManager manager)
043    {
044        super.initialize(manager);
045        this.manager = OpenJPAJCacheDataCacheManager.class.cast(manager);
046    }
047
048    @Override
049    protected void clearInternal()
050    {
051        final CacheManager cacheManager = manager.getCacheManager();
052        for (final String cacheName : cacheManager.getCacheNames())
053        {
054            if (!cacheName.startsWith(OPENJPA_PREFIX))
055            {
056                continue;
057            }
058            cacheManager.getCache(cacheName).clear();
059        }
060    }
061
062    @Override
063    protected Collection keySet()
064    {
065        final Collection<QueryKey> keys = new LinkedList<>();
066        for (final Cache.Entry<Object, Object> entry : queryCache())
067        {
068            keys.add(QueryKey.class.cast(entry.getKey()));
069        }
070        return keys;
071    }
072
073    @Override
074    protected QueryResult getInternal(final QueryKey qk)
075    {
076        return QueryResult.class.cast(queryCache().get(qk));
077    }
078
079    private Cache<Object, Object> queryCache()
080    {
081        return manager.getOrCreateCache(OPENJPA_PREFIX, QUERY_CACHE_NAME);
082    }
083
084    @Override
085    protected QueryResult putInternal(final QueryKey qk, final QueryResult oids)
086    {
087        queryCache().put(qk, oids);
088        return oids;
089    }
090
091    @Override
092    protected QueryResult removeInternal(final QueryKey qk)
093    {
094        final Object remove = queryCache().getAndRemove(qk);
095        if (remove == null)
096        {
097            return null;
098        }
099        return QueryResult.class.cast(remove);
100    }
101
102    @Override
103    protected boolean pinInternal(final QueryKey qk)
104    {
105        throw new UnsupportedOperationException();
106    }
107
108    @Override
109    protected boolean unpinInternal(final QueryKey qk)
110    {
111        throw new UnsupportedOperationException();
112    }
113
114    @Override
115    public void writeLock()
116    {
117        lock.lock();
118    }
119
120    @Override
121    public void writeUnlock()
122    {
123        lock.unlock();
124    }
125}