org.apache.openjpa.conf.QueryCompilationCacheValue 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.openjpa.conf;
import java.util.Collections;
import java.util.Hashtable;
import java.util.Map;
import org.apache.openjpa.lib.conf.Configuration;
import org.apache.openjpa.lib.conf.PluginValue;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.openjpa.lib.util.ParseException;
import org.apache.openjpa.util.CacheMap;
/**
* A cache of compiled queries.
*
* @author Abe White
* @since 0.9.6 (also existed in prior versions of Kodo)
* @nojavadoc
*/
public class QueryCompilationCacheValue
extends PluginValue {
public static final String[] ALIASES = {
"true", CacheMap.class.getName(),
"all", ConcurrentHashMap.class.getName(),
"false", null,
};
public QueryCompilationCacheValue(String prop) {
super(prop, true);
setAliases(ALIASES);
setDefault(ALIASES[0]);
setClassName(ALIASES[1]);
}
public Object newInstance(String clsName, Class type,
Configuration conf, boolean fatal) {
// make sure map handles concurrency
Map map;
try {
map = (Map) super.newInstance(clsName, type, conf, fatal);
} catch (ParseException pe) {
// OPENJPA256: this class differs from most plugins in that
// the plugin type is the standard java interface Map.class (rather
// than an openjpa-specific interface), which means that the
// ClassLoader used to load the implementation will be the system
// class loader; this presents a problem if OpenJPA is not in the
// system classpath, so work around the problem by catching
// the ParseException (which is what we wrap the
// ClassNotFoundException in) and try again, this time using
// this class' ClassLoader.
map = (Map) super.newInstance(clsName,
QueryCompilationCacheValue.class, conf, fatal);
} catch (IllegalArgumentException iae) {
// OPENJPA256: this class differs from most plugins in that
// the plugin type is the standard java interface Map.class (rather
// than an openjpa-specific interface), which means that the
// ClassLoader used to load the implementation will be the system
// class loader; this presents a problem if OpenJPA is not in the
// system classpath, so work around the problem by catching
// the IllegalArgumentException (which is what we wrap the
// ClassNotFoundException in) and try again, this time using
// this class' ClassLoader.
map = (Map) super.newInstance(clsName,
QueryCompilationCacheValue.class, conf, fatal);
}
if (map != null && !(map instanceof Hashtable)
&& !(map instanceof CacheMap)
&& !(map instanceof
org.apache.openjpa.lib.util.concurrent.ConcurrentMap)
&& !(map instanceof java.util.concurrent.ConcurrentMap))
map = Collections.synchronizedMap(map);
return map;
}
}