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.support.CamelContextHelper;
027import org.apache.camel.support.service.ServiceHelper;
028import org.apache.camel.util.ObjectHelper;
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
043        implements InitializingBean, DisposableBean, ApplicationContextAware, CamelContextAware {
044    private String uri;
045    private CamelContext camelContext;
046    private String camelContextId;
047    private Consumer consumer;
048    private String serviceRef;
049    private String method;
050    private ApplicationContext applicationContext;
051
052    public String getUri() {
053        return uri;
054    }
055
056    public void setUri(String uri) {
057        this.uri = uri;
058    }
059
060    @Override
061    public CamelContext getCamelContext() {
062        return camelContext;
063    }
064
065    @Override
066    public void setCamelContext(CamelContext camelContext) {
067        this.camelContext = camelContext;
068    }
069
070    public void setCamelContextId(String camelContextId) {
071        this.camelContextId = camelContextId;
072    }
073
074    public String getServiceRef() {
075        return serviceRef;
076    }
077
078    public void setServiceRef(String serviceRef) {
079        this.serviceRef = serviceRef;
080    }
081
082    public String getMethod() {
083        return method;
084    }
085
086    public void setMethod(String method) {
087        this.method = method;
088    }
089
090    public ApplicationContext getApplicationContext() {
091        return applicationContext;
092    }
093
094    @Override
095    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
096        this.applicationContext = applicationContext;
097    }
098
099    @Override
100    public void afterPropertiesSet() throws Exception {
101        // lets bind the URI to a pojo
102        notNull(uri, "uri");
103        // Always resolve the camel context by using the camelContextID
104        if (ObjectHelper.isNotEmpty(camelContextId)) {
105            camelContext = CamelContextResolverHelper.getCamelContextWithId(applicationContext, camelContextId);
106        }
107        notNull(camelContext, "camelContext");
108        if (serviceRef != null && getService() == null && applicationContext != null) {
109            setService(applicationContext.getBean(serviceRef));
110        }
111
112        Endpoint endpoint = CamelContextHelper.getMandatoryEndpoint(camelContext, uri);
113        notNull(getService(), "service");
114        Object proxy = getProxyForService();
115
116        try {
117            // need to start endpoint before we create consumer
118            ServiceHelper.initService(endpoint);
119            BeanProcessor processor = new BeanProcessor(proxy, camelContext);
120            processor.setMethod(method);
121            consumer = endpoint.createConsumer(processor);
122            // add and start consumer
123            camelContext.addService(consumer, true, false);
124        } catch (Exception e) {
125            throw new FailedToCreateConsumerException(endpoint, e);
126        }
127    }
128
129    @Override
130    public void destroy() throws Exception {
131        // we let CamelContext manage the lifecycle of the consumer and shut it down when Camel stops
132    }
133
134}