001 /**
002 *
003 * Copyright 2004 The Apache Software Foundation
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * 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
018 package org.apache.geronimo.naming.reference;
019
020 import org.apache.geronimo.gbean.AbstractName;
021 import org.apache.geronimo.gbean.AbstractNameQuery;
022 import org.apache.geronimo.kernel.GBeanNotFoundException;
023 import org.apache.geronimo.kernel.Kernel;
024 import org.apache.geronimo.kernel.repository.Artifact;
025
026 import javax.naming.NameNotFoundException;
027
028 /**
029 * @version $Rev: 406864 $ $Date: 2006-05-16 00:36:42 -0700 (Tue, 16 May 2006) $
030 */
031 public class ResourceReference extends ConfigurationAwareReference {
032 private final Class iface;
033
034 /**
035 *
036 * @param configId the configId of the configuration that holds the reference, not the resource adapter.
037 * @param abstractNameQuery query for name of the resource adapter.
038 * @param iface
039 */
040 public ResourceReference(Artifact configId, AbstractNameQuery abstractNameQuery, Class iface) {
041 super(configId, abstractNameQuery);
042 this.iface = iface;
043 }
044
045 public String getClassName() {
046 return iface.getName();
047 }
048
049 public Object getContent() throws NameNotFoundException {
050 Kernel kernel = getKernel();
051
052 AbstractName target;
053 try {
054 target = resolveTargetName();
055 } catch (GBeanNotFoundException e) {
056 throw (NameNotFoundException) new NameNotFoundException("Could not resolve name query: " + abstractNameQueries).initCause(e);
057 }
058
059 Object proxy;
060 try {
061 proxy = kernel.invoke(target, "$getResource");
062 } catch (Exception e) {
063 throw (IllegalStateException) new IllegalStateException("Could not get proxy").initCause(e);
064 }
065 if (proxy == null) {
066 throw new IllegalStateException("Proxy not returned. Target " + target + " not started");
067 }
068 if (!iface.isAssignableFrom(proxy.getClass())) {
069 Class proxyClass = proxy.getClass();
070 Class[] interfaces = proxyClass.getInterfaces();
071 StringBuffer message = new StringBuffer();
072 boolean namesMatch = false;
073 for (int i = 0; i < interfaces.length; i++) {
074 Class anInterface = interfaces[i];
075 if (iface.getName().equals(anInterface.getName())) {
076 namesMatch = true;
077 message.append("Proxy implements correct interface: ").append(iface.getName()).append(", but classloaders differ\n");
078 message.append("lookup interface classloader: ").append(iface.getClassLoader().toString()).append("\n");
079 message.append("target interface classloader: ").append(anInterface.getClassLoader().toString()).append("\n");
080 message.append("target proxy classloader: ").append(proxy.getClass().getClassLoader());
081 break;
082 }
083 }
084 if (!namesMatch) {
085 message.append("Proxy does not implement an interface named: ").append(iface.getName());
086 }
087 throw new ClassCastException(message.toString());
088 }
089 return proxy;
090
091 }
092 }