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.store;
018
019import org.apache.activemq.command.Message;
020import org.apache.activemq.command.MessageId;
021
022/**
023 * 
024 */
025public interface MessageRecoveryListener {
026    boolean recoverMessage(Message message) throws Exception;
027    boolean recoverMessageReference(MessageId ref) throws Exception;
028    boolean hasSpace();
029    /**
030     * check if ref is a duplicate but do not record the reference
031     * @param ref
032     * @return true if ref is a duplicate
033     */
034    boolean isDuplicate(MessageId ref);
035}