org.apache.cayenne.jcache.JCacheEntryLoader Maven / Gradle / Ivy
/*****************************************************************
* 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.cayenne.jcache;
import java.util.List;
import javax.cache.processor.EntryProcessor;
import javax.cache.processor.EntryProcessorException;
import javax.cache.processor.MutableEntry;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.cache.QueryCacheEntryFactory;
/**
* @since 4.0
*/
public class JCacheEntryLoader implements EntryProcessor {
private QueryCacheEntryFactory entryFactory;
public JCacheEntryLoader(QueryCacheEntryFactory entryFactory) {
this.entryFactory = entryFactory;
}
@Override
public List process(MutableEntry entry, Object... arguments) throws EntryProcessorException {
if (!entry.exists()) {
List result = (List)entryFactory.createObject();
// sanity checking value
if (result == null) {
throw new CayenneRuntimeException("Null object created: %s", entry.getKey());
}
entry.setValue(result);
}
return entry.getValue();
}
}