| /* |
| * 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 $Id$ |
| */ |
| 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); |
| } |
| } |