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.activemq.camel;
018
019import org.apache.activemq.broker.BrokerService;
020import org.apache.camel.CamelContext;
021import org.apache.camel.CamelContextAware;
022import org.slf4j.Logger;
023import org.slf4j.LoggerFactory;
024import org.springframework.beans.factory.annotation.Autowired;
025
026/**
027 * A shutdown hook that can be used to shutdown {@link CamelContext} before the
028 * ActiveMQ broker is shut down. This is sometimes important as if the broker is
029 * shutdown before Camel there could be a loss of data due to inflight exchanges
030 * not yet completed.
031 * <p>
032 * This hook can be added to ActiveMQ configuration ({@code activemq.xml}) as in
033 * the following example:
034 * <p>
035 * <code>
036 * &lt;bean xmlns=&quot;http://www.springframework.org/schema/beans&quot; class=&quot;org.apache.activemq.camel.CamelShutdownHook&quot; /&gt;
037 * </code>
038 */
039public final class CamelShutdownHook implements Runnable, CamelContextAware {
040
041    private static final Logger LOG = LoggerFactory.getLogger(CamelShutdownHook.class);
042
043    private CamelContext camelContext;
044
045    @Autowired
046    public CamelShutdownHook(final BrokerService brokerService) {
047        brokerService.addPreShutdownHook(this);
048    }
049
050    @Override
051    public CamelContext getCamelContext() {
052        return camelContext;
053    }
054
055    @Override
056    public void run() {
057        if (camelContext != null) {
058            try {
059                camelContext.stop();
060            } catch (final Exception e) {
061                LOG.warn("Unable to stop CamelContext", e);
062            }
063        } else {
064            LOG.warn("Unable to stop CamelContext, no CamelContext was set!");
065        }
066    }
067
068    @Override
069    public void setCamelContext(final CamelContext camelContext) {
070        this.camelContext = camelContext;
071    }
072
073}