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.spring.remoting;
018
019import org.apache.camel.CamelContext;
020import org.apache.camel.CamelContextAware;
021import org.apache.camel.Consumer;
022import org.apache.camel.Endpoint;
023import org.apache.camel.FailedToCreateConsumerException;
024import org.apache.camel.component.bean.BeanProcessor;
025import org.apache.camel.spring.util.CamelContextResolverHelper;
026import org.apache.camel.util.CamelContextHelper;
027import org.apache.camel.util.ObjectHelper;
028import org.apache.camel.util.ServiceHelper;
029import org.springframework.beans.BeansException;
030import org.springframework.beans.factory.DisposableBean;
031import org.springframework.beans.factory.FactoryBean;
032import org.springframework.beans.factory.InitializingBean;
033import org.springframework.context.ApplicationContext;
034import org.springframework.context.ApplicationContextAware;
035import org.springframework.remoting.support.RemoteExporter;
036
037import static org.apache.camel.util.ObjectHelper.notNull;
038
039/**
040 * A {@link FactoryBean} to create a proxy to a service exposing a given {@link #getServiceInterface()}
041 */
042public class CamelServiceExporter extends RemoteExporter implements InitializingBean, DisposableBean, ApplicationContextAware, CamelContextAware {
043    private String uri;
044    private CamelContext camelContext;
045    private String camelContextId;
046    private Consumer consumer;
047    private String serviceRef;
048    private ApplicationContext applicationContext;
049
050    public String getUri() {
051        return uri;
052    }
053
054    public void setUri(String uri) {
055        this.uri = uri;
056    }
057
058    public CamelContext getCamelContext() {
059        return camelContext;
060    }
061
062    public void setCamelContext(CamelContext camelContext) {
063        this.camelContext = camelContext;
064    }
065    
066    public void setCamelContextId(String camelContextId) {
067        this.camelContextId = camelContextId;
068    }
069
070    public String getServiceRef() {
071        return serviceRef;
072    }
073
074    public void setServiceRef(String serviceRef) {
075        this.serviceRef = serviceRef;
076    }
077
078    public ApplicationContext getApplicationContext() {
079        return applicationContext;
080    }
081
082    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
083        this.applicationContext = applicationContext;
084    }
085
086    public void afterPropertiesSet() throws Exception {
087        // lets bind the URI to a pojo
088        notNull(uri, "uri");
089        // Always resolve the camel context by using the camelContextID
090        if (ObjectHelper.isNotEmpty(camelContextId)) {
091            camelContext = CamelContextResolverHelper.getCamelContextWithId(applicationContext, camelContextId);
092        }
093        notNull(camelContext, "camelContext");
094        if (serviceRef != null && getService() == null && applicationContext != null) {
095            setService(applicationContext.getBean(serviceRef));
096        }
097
098        Endpoint endpoint = CamelContextHelper.getMandatoryEndpoint(camelContext, uri);
099        notNull(getService(), "service");
100        Object proxy = getProxyForService();
101
102        try {
103            // need to start endpoint before we create consumer
104            ServiceHelper.startService(endpoint);
105            consumer = endpoint.createConsumer(new BeanProcessor(proxy, camelContext));
106            // add and start consumer
107            camelContext.addService(consumer, true, true);
108        } catch (Exception e) {
109            throw new FailedToCreateConsumerException(endpoint, e);
110        }
111    }
112
113    public void destroy() throws Exception {
114        // we let CamelContext manage the lifecycle of the consumer and shut it down when Camel stops
115    }
116
117}