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.component.bean;
018
019 import java.lang.reflect.Proxy;
020
021 import org.apache.camel.Endpoint;
022 import org.apache.camel.Producer;
023
024 /**
025 * A helper class for creating proxies which delegate to Camel
026 *
027 * @version $Revision: 701059 $
028 */
029 public final class ProxyHelper {
030
031 /**
032 * Utility classes should not have a public constructor.
033 */
034 private ProxyHelper() {
035 }
036
037
038 /**
039 * Creates a Proxy which sends PojoExchange to the endpoint.
040 */
041 @SuppressWarnings("unchecked")
042 public static Object createProxyObject(Endpoint endpoint, Producer producer, ClassLoader classLoader, Class[] interfaces, MethodInfoCache methodCache) {
043 return Proxy.newProxyInstance(classLoader, interfaces.clone(), new CamelInvocationHandler(endpoint, producer, methodCache));
044 }
045
046
047 /**
048 * Creates a Proxy which sends PojoExchange to the endpoint.
049 *
050 * @throws Exception
051 */
052 @SuppressWarnings("unchecked")
053 public static <T> T createProxy(Endpoint endpoint, ClassLoader cl, Class[] interfaces, MethodInfoCache methodCache) throws Exception {
054 return (T) createProxyObject(endpoint, endpoint.createProducer(), cl, interfaces, methodCache);
055 }
056
057 /**
058 * Creates a Proxy which sends PojoExchange to the endpoint.
059 *
060 * @throws Exception
061 */
062 @SuppressWarnings("unchecked")
063 public static <T> T createProxy(Endpoint endpoint, ClassLoader cl, Class<T>... interfaceClasses) throws Exception {
064 return (T) createProxy(endpoint, cl, interfaceClasses, createMethodInfoCache(endpoint));
065 }
066
067
068 /**
069 * Creates a Proxy which sends PojoExchange to the endpoint.
070 *
071 * @throws Exception
072 */
073 @SuppressWarnings("unchecked")
074 public static <T> T createProxy(Endpoint endpoint, Class<T>... interfaceClasses) throws Exception {
075 return (T) createProxy(endpoint, getClassLoader(interfaceClasses), interfaceClasses);
076 }
077
078 /**
079 * Creates a Proxy which sends PojoExchange to the endpoint.
080 *
081 * @throws Exception
082 */
083 @SuppressWarnings("unchecked")
084 public static <T> T createProxy(Endpoint endpoint, Producer producer, Class<T>... interfaceClasses) throws Exception {
085 return (T) createProxyObject(endpoint, producer, getClassLoader(interfaceClasses), interfaceClasses, createMethodInfoCache(endpoint));
086 }
087
088
089 /**
090 * Returns the class loader of the first interface or throws {@link IllegalArgumentException} if there are no interfaces specified
091 *
092 * @return the class loader
093 */
094 protected static ClassLoader getClassLoader(Class... interfaces) {
095 if (interfaces == null || interfaces.length < 1) {
096 throw new IllegalArgumentException("You must provide at least 1 interface class.");
097 }
098 return interfaces[0].getClassLoader();
099 }
100
101
102 protected static MethodInfoCache createMethodInfoCache(Endpoint endpoint) {
103 return new MethodInfoCache(endpoint.getCamelContext());
104 }
105
106 }