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.camel.processor.idempotent;
018
019 /**
020 * Access to a repository of Message IDs to implement the
021 * <a href="http://activemq.apache.org/camel/idempotent-consumer.html">Idempotent Consumer</a> pattern.
022 *
023 * @version $Revision: 630568 $
024 */
025 public interface MessageIdRepository {
026
027 /**
028 * Returns true if this messageId has been processed before
029 * otherwise this messageId is added to the repository and false is returned.
030 *
031 * @param messageId the String ID of the message
032 * @return true if the message has been processed succesfully before otherwise false
033 */
034 boolean contains(String messageId);
035 }