001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  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    package org.apache.activemq.transport.reliable;
018    
019    import java.io.IOException;
020    
021    /**
022     * Used by a {@link ReplayBuffer} to replay buffers back over an unreliable transport
023     * 
024     * 
025     */
026    public interface Replayer {
027    
028        /**
029         * Sends the given buffer back to the transport
030         * if the buffer could be found - otherwise maybe send some kind
031         * of exception
032         * 
033         * @param commandId the command ID
034         * @param buffer the buffer to be sent - or null if the buffer no longer exists in the buffer
035         */
036        void sendBuffer(int commandId, Object buffer) throws IOException;
037    }