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 */
017package org.apache.activemq.transport.reliable;
018
019
020import java.io.IOException;
021
022/**
023 * A pluggable strategy for how to deal with dropped packets.
024 * 
025 * 
026 */
027public 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