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.camel.impl;
018
019import org.apache.camel.Endpoint;
020import org.apache.camel.Exchange;
021import org.apache.camel.Processor;
022
023/**
024 * A base class for selector-based producers.
025 */
026public abstract class BaseSelectorProducer extends DefaultProducer {
027    protected BaseSelectorProducer(Endpoint endpoint) {
028        super(endpoint);
029    }
030
031    @Override
032    public void process(Exchange exchange) throws Exception {
033        final Processor processor = getProcessor(exchange);
034        if (processor != null) {
035            processor.process(exchange);
036        } else {
037            onMissingProcessor(exchange);
038        }
039    }
040
041    /**
042     * Determine the processor to use to handle the exchange.
043     *
044     * @param exchange the message exchange
045     * @return the processor to processes the message exchange
046     * @throws Exception
047     */
048    protected abstract Processor getProcessor(Exchange exchange) throws Exception;
049
050    /**
051     * Invoked when no processor has been defined to process the message exchnage.
052     *
053     * @param exchange the message exchange
054     * @throws Exception
055     */
056    protected abstract void onMissingProcessor(Exchange exchange) throws Exception;
057}