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    
020    import java.io.IOException;
021    
022    /**
023     * A pluggable strategy for how to deal with dropped packets.
024     * 
025     * 
026     */
027    public interface ReplayStrategy {
028    
029        /**
030         * Deals with a dropped packet. 
031         * 
032         * @param transport the transport on which the packet was dropped
033         * @param expectedCounter the expected command counter
034         * @param actualCounter the actual command counter
035         * @param nextAvailableCounter TODO
036         * @return true if the command should be buffered or false if it should be discarded
037         */
038        boolean onDroppedPackets(ReliableTransport transport, int expectedCounter, int actualCounter, int nextAvailableCounter) throws IOException;
039    
040        void onReceivedPacket(ReliableTransport transport, long expectedCounter);
041    
042    }
043