001    /** 
002     * 
003     * Copyright 2004 Protique Ltd
004     * 
005     * Licensed under the Apache License, Version 2.0 (the "License"); 
006     * you may not use this file except in compliance with the License. 
007     * You may obtain a copy of the License at 
008     * 
009     * http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS, 
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
014     * See the License for the specific language governing permissions and 
015     * limitations under the License. 
016     * 
017     **/
018    package org.activemq.util;
019    
020    /**
021     * A simple callback object used by the
022     * {@link org.activemq.util.TransactionTemplate}
023     * and {@link org.activemq.util.ExceptionTemplate}
024       objects to provide automatic transactional or exception handling blocks.
025     *
026     * @version $Revision: 1.1.1.1 $
027     */
028    public interface Callback {
029    
030        /**
031         * Executes some piece of code within a transaction
032         * performing a commit if there is no exception thrown
033         * else a rollback is performed
034         *
035         * @throws Throwable
036         */
037        public void execute() throws Throwable;
038    }