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.blueprint;
018    
019    import java.util.Set;
020    import javax.xml.bind.annotation.XmlAccessType;
021    import javax.xml.bind.annotation.XmlAccessorType;
022    import javax.xml.bind.annotation.XmlAttribute;
023    import javax.xml.bind.annotation.XmlRootElement;
024    import javax.xml.bind.annotation.XmlTransient;
025    
026    import org.apache.aries.blueprint.ExtendedBlueprintContainer;
027    import org.apache.camel.CamelContext;
028    import org.apache.camel.Endpoint;
029    import org.apache.camel.FailedToCreateProducerException;
030    import org.apache.camel.Producer;
031    import org.apache.camel.component.bean.ProxyHelper;
032    import org.apache.camel.core.xml.AbstractCamelFactoryBean;
033    import org.apache.camel.util.ServiceHelper;
034    
035    /**
036     * A factory to create a Proxy to a a Camel Pojo Endpoint.
037     */
038    @XmlRootElement(name = "proxy")
039    @XmlAccessorType(XmlAccessType.FIELD)
040    public class CamelProxyFactoryBean extends AbstractCamelFactoryBean<Object> {
041    
042        @XmlAttribute
043        private String serviceUrl;
044        @XmlAttribute
045        private String serviceRef;
046        @XmlAttribute
047        private String serviceInterface;
048        @XmlTransient
049        private Endpoint endpoint;
050        @XmlTransient
051        private Object serviceProxy;
052        @XmlTransient
053        private Producer producer;
054        @XmlTransient
055        private ExtendedBlueprintContainer blueprintContainer;
056    
057        public Object getObject() {
058            return serviceProxy;
059        }
060    
061        public Class<Object> getObjectType() {
062            return Object.class;
063        }
064    
065        protected CamelContext getCamelContextWithId(String camelContextId) {
066            if (blueprintContainer != null) {
067                return (CamelContext) blueprintContainer.getComponentInstance(camelContextId);
068            }
069            return null;
070        }
071    
072        @Override
073        protected CamelContext discoverDefaultCamelContext() {
074            if (blueprintContainer != null) {
075                Set<String> ids = BlueprintCamelContextLookupHelper.lookupBlueprintCamelContext(blueprintContainer);
076                if (ids.size() == 1) {
077                    // there is only 1 id for a BlueprintCamelContext so fallback and use this
078                    return getCamelContextWithId(ids.iterator().next());
079                }
080            }
081            return null;
082        }
083    
084        public void afterPropertiesSet() throws Exception {
085            if (endpoint == null) {
086                getCamelContext();
087                if (getServiceUrl() == null && getServiceRef() == null) {
088                    throw new IllegalArgumentException("serviceUrl or serviceRef must be specified.");
089                }
090                if (getServiceInterface() == null) {
091                    throw new IllegalArgumentException("serviceInterface must be specified.");
092                }
093    
094                // lookup endpoint or we have the url for it
095                if (getServiceRef() != null) {
096                    endpoint = getCamelContext().getRegistry().lookup(getServiceRef(), Endpoint.class);
097                } else {
098                    endpoint = getCamelContext().getEndpoint(getServiceUrl());
099                }
100    
101                if (endpoint == null) {
102                    throw new IllegalArgumentException("Could not resolve endpoint: " + getServiceUrl());
103                }
104            }
105    
106            try {
107                producer = endpoint.createProducer();
108                ServiceHelper.startService(producer);
109                Class<?> clazz = blueprintContainer.loadClass(getServiceInterface());
110                serviceProxy = ProxyHelper.createProxy(endpoint, producer, clazz);
111            } catch (Exception e) {
112                throw new FailedToCreateProducerException(endpoint, e);
113            }
114        }
115    
116        public void destroy() throws Exception {
117            ServiceHelper.stopService(producer);
118        }
119    
120        public String getServiceUrl() {
121            return serviceUrl;
122        }
123    
124        public void setServiceUrl(String serviceUrl) {
125            this.serviceUrl = serviceUrl;
126        }
127    
128        public String getServiceRef() {
129            return serviceRef;
130        }
131    
132        public void setServiceRef(String serviceRef) {
133            this.serviceRef = serviceRef;
134        }
135    
136        public String getServiceInterface() {
137            return serviceInterface;
138        }
139    
140        public void setServiceInterface(String serviceInterface) {
141            this.serviceInterface = serviceInterface;
142        }
143    
144        public Endpoint getEndpoint() {
145            return endpoint;
146        }
147    
148        public void setEndpoint(Endpoint endpoint) {
149            this.endpoint = endpoint;
150        }
151    
152        public Producer getProducer() {
153            return producer;
154        }
155    
156        public void setProducer(Producer producer) {
157            this.producer = producer;
158        }
159    
160        public ExtendedBlueprintContainer getBlueprintContainer() {
161            return blueprintContainer;
162        }
163    
164        public void setBlueprintContainer(ExtendedBlueprintContainer blueprintContainer) {
165            this.blueprintContainer = blueprintContainer;
166        }
167    
168    }