001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.services;
016    
017    
018    /**
019     * An pool for objects.  Objects may be stored in a Pool for later reuse.
020     *
021     * @author Howard Lewis Ship
022     * @since 4.0
023     */
024    public interface ObjectPool
025    {
026            /**
027             * Returns an object from the pool, previously stored with the given key. May
028             * return null if no such object exists.
029             */
030            Object get(Object key);
031            
032            /**
033             * Stores an object into the pool for later retrieval with the provided key.
034             */
035            
036            void store(Object key, Object value);
037    }