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;
018    
019    /**
020     * {@link org.apache.camel.Endpoint} can optionally implement this interface to
021     * indicate whether or not it supports multiple consumers or not.
022     * <p/>
023     * By default endpoints is assumed <b>not</b> to support multiple consumers.
024     * <p/>
025     * A rare few endpoint does in fact support multiple consumers and thus the purpose of this interface.
026     * For example JMS endpoints which has topics that can be consumed by multiple consumers.
027     * <p/>
028     * The purpose of this is to check on startup that we do not have multiple consumers
029     * for the <b>same</b> endpoints. This prevent starting up when there was a copy/paste mistakes in the Camel routes.
030     *
031     * @version $Revision: 881804 $
032     */
033    public interface MultipleConsumersSupport {
034    
035        /**
036         * Is multiple consumers supported?
037         *
038         * @return <tt>true</tt> if multiple consumers is supported
039         */
040        boolean isMultipleConsumersSupported();
041    }