| /* |
| * Copyright 1999-2004 The Apache Software Foundation. |
| * |
| * Licensed 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.components.store; |
| |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| |
| import java.util.Enumeration; |
| import java.util.Hashtable; |
| |
| /** |
| * |
| * @deprecated Use the Avalon Excalibur Store instead. |
| * |
| * @author <a href="mailto:scoobie@betaversion.org">Federico Barbieri</a> |
| * (Betaversion Productions) |
| * @author <a href="mailto:stefano@apache.org">Stefano Mazzocchi</a> |
| * (Apache Software Foundation) |
| * @author <a href="mailto:pier@apache.org">Pierpaolo Fumagalli</a> |
| * (Apache Software Foundation) |
| * @version CVS $Id: MemoryStore.java,v 1.2 2004/03/05 13:02:41 bdelacretaz Exp $ |
| */ |
| public class MemoryStore implements Store, ThreadSafe { |
| /* WARNING: Hashtable is threadsafe, whereas HashMap is not. |
| * Should we move this class over to the Collections API, |
| * use Collections.synchronizedMap(Map map) to ensure |
| * accesses are synchronized. |
| */ |
| |
| /** The shared store */ |
| private Hashtable table = new Hashtable(); |
| |
| /** |
| * Get the object associated to the given unique key. |
| */ |
| public synchronized Object get(Object key) { |
| return(table.get(key)); |
| } |
| |
| /** |
| * Store the given object in a persistent state. It is up to the |
| * caller to ensure that the key has a persistent state across |
| * different JVM executions. |
| */ |
| public synchronized void store(Object key, Object value) { |
| this.hold(key,value); |
| } |
| |
| /** |
| * Holds the given object in a volatile state. This means |
| * the object store will discard held objects if the |
| * virtual machine is restarted or some error happens. |
| */ |
| public synchronized void hold(Object key, Object value) { |
| table.put(key,value); |
| } |
| |
| /** |
| * Remove the object associated to the given key. |
| */ |
| public synchronized void remove(Object key) { |
| table.remove(key); |
| } |
| |
| public synchronized void free() {} |
| |
| /** |
| * Indicates if the given key is associated to a contained object. |
| */ |
| public synchronized boolean containsKey(Object key) { |
| return(table.containsKey(key)); |
| } |
| |
| /** |
| * Returns the list of used keys as an Enumeration of Objects. |
| */ |
| public synchronized Enumeration keys() { |
| return(table.keys()); |
| } |
| |
| /** |
| * Returns count of the objects in the store, or -1 if could not be |
| * obtained. |
| */ |
| public synchronized int size() |
| { |
| return table.size(); |
| } |
| } |