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package com.sun.ejb.containers;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Proxy;
import java.lang.reflect.Method;
import javax.ejb.EJBException;
import com.sun.ejb.containers.util.InvocationHandlerUtil;
/**
* This is an invocation handler for a remote EJB 3.x business
* interface. It is used to convert invocations made on the
* EJB 3.0 business interface to its corresponding RMI-IIOP
* object.
*
* @@@ Need to handle serialization/deserialization
*
* @author Kenneth Saks
*/
public final class RemoteBusinessIntfInvocationHandler
implements InvocationHandler, Serializable {
private Class businessInterface;
private java.rmi.Remote delegate;
public RemoteBusinessIntfInvocationHandler(Class businessIntf,
java.rmi.Remote stub) {
businessInterface = businessIntf;
delegate = stub;
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
// NOTE : be careful with "args" parameter. It is null
// if method signature has 0 arguments.
Class methodClass = method.getDeclaringClass();
if( methodClass == java.lang.Object.class ) {
return InvocationHandlerUtil.
invokeJavaObjectMethod(this, method, args);
}
Object returnValue = null;
Throwable t = null;
try {
Method m = delegate.getClass().getMethod
(method.getName(), method.getParameterTypes());
returnValue = m.invoke(delegate, args);
} catch(NoSuchMethodException nsme) {
t = nsme;
} catch(InvocationTargetException ite) {
t = ite.getCause();
} catch(Throwable c) {
t = c;
}
if( t != null ) {
if( t instanceof java.rmi.RemoteException ) {
EJBException ejbEx = new EJBException();
ejbEx.initCause(t);
throw ejbEx;
} else {
throw t;
}
}
return returnValue;
}
}