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 }