001 /** 002 * 003 * Licensed to the Apache Software Foundation (ASF) under one or more 004 * contributor license agreements. See the NOTICE file distributed with 005 * this work for additional information regarding copyright ownership. 006 * The ASF licenses this file to You under the Apache License, Version 2.0 007 * (the "License"); you may not use this file except in compliance with 008 * the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 package org.apache.camel.processor.idempotent; 019 020 /** 021 * Access to a repository of Message IDs to implement the 022 * <a href="http://activemq.apache.org/camel/idempotent-consumer.html">Idempotent Consumer</a> pattern. 023 * 024 * @version $Revision: 1.1 $ 025 */ 026 public interface MessageIdRepository { 027 028 /** 029 * Returns true if this messageId has been processed before 030 * otherwise this messageId is added to the repository and false is returned. 031 * 032 * @param messageId the String ID of the message 033 * @return true if the message has been processed succesfully before otherwise false 034 */ 035 boolean contains(String messageId); 036 }