/* | |
* Licensed to the Apache Software Foundation (ASF) under one | |
* or more contributor license agreements. See the NOTICE file | |
* distributed with this work for additional information | |
* regarding copyright ownership. The ASF 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.apache.openjpa.persistence.datacache; | |
import java.io.ByteArrayInputStream; | |
import java.io.ByteArrayOutputStream; | |
import java.io.ObjectInputStream; | |
import java.io.ObjectOutputStream; | |
import org.apache.openjpa.datacache.ConcurrentQueryCache; | |
import org.apache.openjpa.datacache.QueryKey; | |
import org.apache.openjpa.datacache.QueryResult; | |
/** | |
* A QueryCache implementation that serializes all keys / values to simulate having a remote cache. | |
*/ | |
public class SerializingConcurrentQueryCache extends ConcurrentQueryCache { | |
private static final long serialVersionUID = 1L; | |
public static String SERIALIZING_CONCURRENT_QUERY_CACHE = SerializingConcurrentQueryCache.class.getName(); | |
@Override | |
public QueryResult get(QueryKey key) { | |
return roundtrip(super.get(roundtrip(key))); | |
} | |
@Override | |
public QueryResult put(QueryKey qk, QueryResult oids) { | |
roundtrip(qk); | |
roundtrip(oids); | |
return roundtrip(super.put(qk, oids)); | |
} | |
@SuppressWarnings("unchecked") | |
private static <T> T roundtrip(T o) { | |
try { | |
ByteArrayOutputStream bytes = new ByteArrayOutputStream(); | |
ObjectOutputStream out = new ObjectOutputStream(bytes); | |
out.writeObject(o); | |
out.flush(); | |
ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytes.toByteArray())); | |
return (T) in.readObject(); | |
} catch (Exception e) { | |
throw new RuntimeException(e); | |
} | |
} | |
} |