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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.binding.jms.provider;
import java.lang.reflect.Constructor;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedExceptionAction;
import java.security.PrivilegedActionException;
import org.apache.tuscany.sca.binding.jms.JMSBinding;
import org.apache.tuscany.sca.binding.jms.JMSBindingException;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
/**
* Utility methods to load JMS message processors.
*
* @version $Rev$ $Date$
*/
public class JMSMessageProcessorUtil {
/**
* Used to create instances of the JMSResourceFactory and RequestMessageProcessor and ResponseMessageProcessor from
* string based class name provided in the configuration
*
* @param cl ClassLoader
* @param className the string based class name to load and instantiate
* @return the new object
*/
private static Object instantiate(ClassLoader cl, final String className, final JMSBinding binding) {
Object instance;
if (cl == null) {
cl = cl = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
return binding.getClass().getClassLoader();
}
});
}
try {
Class<?> clazz;
try {
clazz = cl.loadClass(className);
} catch (ClassNotFoundException e) {
try{
clazz = AccessController.doPrivileged(new PrivilegedExceptionAction<Class>() {
public Class run() throws ClassNotFoundException{
return binding.getClass().getClassLoader().loadClass(className);
}
});
} catch (PrivilegedActionException ex) {
throw (ClassNotFoundException) ex.getException();
}
}
Constructor<?> constructor = clazz.getDeclaredConstructor(new Class[] {JMSBinding.class});
instance = constructor.newInstance(binding);
} catch (Throwable e) {
throw new JMSBindingException("Exception instantiating OperationAndDataBinding class", e);
}
return instance;
}
// public static JMSMessageProcessor getRequestMessageProcessor(JMSBinding binding) {
// return (JMSMessageProcessor)instantiate(null, binding.getRequestMessageProcessorName(), binding);
// }
//
// public static JMSMessageProcessor getResponseMessageProcessor(JMSBinding binding) {
// return (JMSMessageProcessor)instantiate(null, binding.getResponseMessageProcessorName(), binding);
// }
//
private static Object instantiate(ClassLoader cl, String className, JMSBinding binding, ExtensionPointRegistry registry) {
try {
for (ServiceDeclaration sd : registry.getServiceDiscovery().getServiceDeclarations(JMSMessageProcessor.class)) {
if (className.equals(sd.getClassName())) {
final Class<?> clazz = sd.loadClass();
Constructor<?> constructor;
try {
constructor = AccessController.doPrivileged(new PrivilegedExceptionAction<Constructor<?>>() {
public Constructor<?> run() throws NoSuchMethodException{
return clazz.getDeclaredConstructor(new Class[] {JMSBinding.class, ExtensionPointRegistry.class});
}
});
} catch (PrivilegedActionException ex) {
throw (NoSuchMethodException) ex.getException();
}
return constructor.newInstance(binding, registry);
}
}
throw new JMSBindingException("Class not found: " + className);
} catch (Throwable e) {
throw new JMSBindingException("Exception instantiating OperationAndDataBinding class", e);
}
}
public static JMSMessageProcessor getRequestMessageProcessor(ExtensionPointRegistry registry, JMSBinding binding) {
return (JMSMessageProcessor)instantiate(null, binding.getRequestMessageProcessorName(), binding, registry);
}
public static JMSMessageProcessor getResponseMessageProcessor(ExtensionPointRegistry registry, JMSBinding binding) {
return (JMSMessageProcessor)instantiate(null, binding.getResponseMessageProcessorName(), binding, registry);
}
}
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