/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ejb3.stateless;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import javassist.util.proxy.MethodHandler;
import javassist.util.proxy.ProxyObject;
import javax.naming.Context;
import javax.naming.NamingException;
import org.jboss.aop.Advisor;
import org.jboss.ejb3.Container;
import org.jboss.ejb3.ProxyFactory;
import org.jboss.logging.Logger;
import org.jboss.naming.Util;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 62714 $
*/
public abstract class BaseStatelessProxyFactory extends org.jboss.ejb3.session.BaseSessionProxyFactory implements ProxyFactory
{
private static final Logger log = Logger.getLogger(BaseStatelessProxyFactory.class);
// protected Class proxyClass;
// protected Constructor proxyConstructor;
protected Context proxyFactoryContext;
protected String jndiName;
private javassist.util.proxy.ProxyFactory proxyFactory;
private Class proxyClass;
private Constructor proxyConstructor;
/**
* Adapt the JDK to cglib.
*
* This is a named class because it implements both InvocationHandler and Serializable.
*/
/* TODO: fix EJBTHREE-485 without cglib
private static class CGLibInvocationHandlerAdapter implements net.sf.cglib.proxy.InvocationHandler, Serializable
{
private static final long serialVersionUID = 1L;
private InvocationHandler delegate;
private CGLibInvocationHandlerAdapter(InvocationHandler delegate)
{
if(delegate == null)
throw new IllegalArgumentException("delegate must not be null");
this.delegate = delegate;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
{
return delegate.invoke(proxy, method, args);
}
}
*/
/**
* Adapt the InvocationHandler to MethodHandler.
*
* This is a named class because it implements both MethodHandler and Serializable.
*/
private static class MethodHandlerAdapter implements MethodHandler, Serializable
{
private static final long serialVersionUID = 1L;
private InvocationHandler delegate;
private MethodHandlerAdapter(InvocationHandler delegate)
{
if(delegate == null)
throw new IllegalArgumentException("delegate must not be null");
this.delegate = delegate;
}
public Object invoke(Object self, Method thisMethod, Method process, Object[] args) throws Throwable
{
return delegate.invoke(self, thisMethod, args);
}
}
/**
* Hide the fact that I'm now using javassist.
*
* @param handler a JDK proxy InvocationHandler
* @return a true proxy
*/
protected Object constructProxy(final InvocationHandler handler)
{
try
{
/* plain jdk */
Object args[] = { handler };
Object proxy = proxyConstructor.newInstance(args);
/* javassist */
/*
MethodHandler realHandler = new MethodHandlerAdapter(handler);
// ProxyObject proxy = (ProxyObject) proxyConstructor.newInstance((Object[]) null);
// proxy.setHandler(realHandler);
JavassistProxy proxy = (JavassistProxy) proxyConstructor.newInstance((Object[]) null);
proxy.setMethodHandler(realHandler);
JavassistProxy.pokeInterfaces(proxy, getInterfaces());
*/
/* cglib */
/*
Object args[] = { new CGLibInvocationHandlerAdapter(handler) };
Object proxy = proxyConstructor.newInstance(args);
*/
return proxy;
}
catch (IllegalArgumentException e)
{
throw new RuntimeException(e);
}
catch (InstantiationException e)
{
throw new RuntimeException(e);
}
catch (IllegalAccessException e)
{
throw new RuntimeException(e);
}
catch (InvocationTargetException e)
{
throw new RuntimeException(e.getTargetException());
}
}
public final Object createProxy(Object id)
{
assert id == null : "stateless bean must not have an id";
return createProxy();
}
public void init() throws Exception
{
initializeJndiName();
Class[] interfaces = getInterfaces();
/* plain jdk */
Class proxyClass = java.lang.reflect.Proxy.getProxyClass(container.getBeanClass().getClassLoader(), interfaces);
final Class[] constructorParams =
{InvocationHandler.class};
proxyConstructor = proxyClass.getConstructor(constructorParams);
/* javassist */
/*
proxyFactory = new javassist.util.proxy.ProxyFactory()
{
@Override
protected ClassLoader getClassLoader()
{
return container.getBeanClass().getClassLoader();
}
};
proxyFactory.setInterfaces(interfaces);
proxyFactory.setSuperclass(JavassistProxy.class);
proxyClass = proxyFactory.createClass();
proxyConstructor = proxyClass.getConstructor((Class[]) null);
*/
/* cglib */
/*
proxyClass = net.sf.cglib.proxy.Proxy.getProxyClass(container.getBeanClass().getClassLoader(), interfaces);
final Class[] constructorParams = {net.sf.cglib.proxy.InvocationHandler.class};
proxyConstructor = proxyClass.getConstructor(constructorParams);
*/
}
/* for debugging purposes * /
private static void describeClass(Class cls) {
System.err.println("class " + cls + " has the following:");
for(Class i : cls.getInterfaces()) {
System.err.println(" interface: " + i);
}
for(Method m : cls.getDeclaredMethods()) {
System.err.println(" method: " + m);
}
System.err.println(" classloader = " + cls.getClassLoader());
if(cls.getSuperclass() != null)
describeClass(cls.getSuperclass());
}
*/
public void start() throws Exception
{
init();
Object proxy = createProxy();
//describeClass(proxy.getClass());
bindProxy(proxy);
}
public void stop() throws Exception
{
Util.unbind(container.getInitialContext(), jndiName);
}
protected abstract Class[] getInterfaces();
protected abstract void initializeJndiName();
protected void bindProxy(Object proxy) throws NamingException
{
try
{
log.debug("Binding proxy for " + container.getEjbName() + " in JNDI at " + jndiName);
Util.rebind(container.getInitialContext(), jndiName, proxy);
} catch (NamingException e)
{
NamingException namingException = new NamingException("Could not bind stateless proxy with ejb name " + container.getEjbName() + " into JNDI under jndiName: " + container.getInitialContext().getNameInNamespace() + "/" + jndiName);
namingException.setRootCause(e);
throw namingException;
}
}
public void setContainer(Container container)
{
this.container = container;
this.advisor = (Advisor) container;
}
}
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