/*
* 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.cocoon.forms;
import java.util.Map;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.component.Component;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.excalibur.source.Source;
import org.apache.excalibur.source.SourceValidity;
import org.apache.commons.collections.FastHashMap;
/**
* Component implementing the {@link CacheManager} role.
*
* @version $Id: DefaultCacheManager.java 449149 2006-09-23 03:58:05Z crossley $
*/
public class DefaultCacheManager extends AbstractLogEnabled
implements CacheManager, Disposable, ThreadSafe, Component {
// NOTE: Component is there to allow this block to also run in the 2.1 branch
// FIXME Unbounded map - the road to OOME
protected Map cache;
public DefaultCacheManager() {
this.cache = new FastHashMap();
}
public void dispose() {
this.cache = null;
}
public Object get(Source source, String prefix) {
// Create a cache key
final String key = prefix + source.getURI();
// If object is not in the cache then return null
Object[] objectAndValidity = (Object[]) this.cache.get(key);
if (objectAndValidity == null) {
return null;
}
// If object is in the cache, check stored object validity
final SourceValidity validity = (SourceValidity) objectAndValidity[1];
int valid = validity.isValid();
if (valid == SourceValidity.UNKNOWN) {
// Compare against current source validity
valid = validity.isValid(source.getValidity());
}
// If stored object is not valid then remove object from cache and return null
if (valid != SourceValidity.VALID) {
this.cache.remove(key);
return null;
}
// If valid then return cached object
return objectAndValidity[0];
}
public void set(Object object, Source source, String prefix) {
final SourceValidity validity = source.getValidity();
if (validity != null) {
final String key = prefix + source.getURI();
this.cache.put(key, new Object[]{ object, validity });
}
}
public void remove(Source source, String prefix) {
final String key = prefix + source.getURI();
this.cache.remove(key);
}
}