RE: [Newbie Quetion] How can I check my RPC return value

[Waldron, Terry]

Try Catch Block will do the trick...

-----Original Message-----
From: Dave Stewart [mailto:[EMAIL PROTECTED]
Sent: March 19, 2004 1:00 PM
To: [EMAIL PROTECTED]
Subject: Re: [Newbie Quetion] How can I check my RPC return value

Hi Bagas!

(Caution: I'm not any certified expert in any way, just played with this myself a bit ...)

I'm not sure I'm following your question, but I'll give it a shot anyway ...

On Mar 18, 2004, at 10:49 PM, bagas wrote:

Dear All, 

I am building a XML-RPC Server using org.apache.xmlrpc.WebServer.

I now encounter a problem; the problem is how can I track my response (result). 

Here is an example : 

Suppose I have a Class = 

Public class AServer implements XmlRpcHandler

{

            WebServer serv;

            public static void main(String [] args)

            {

                        Aserver(100);

            }           

            public AServer(int i)

            {

                        serv = Webserver(i);

                        serv.addHandler("$default", this);

            }

public Object execute(String method, Vector params)

            {

                        //do something

                        return something;

            }

} 

after AServer running ….. there are 3 message coming …..

Um, clarification here ... you mean you've called execute with a method name and 3 arguments in params, right?

then the server send a response (result of the method) right ??

According to the documentation, execute() should either return a result *OR THROW AN EXCEPTION*. The result will be a java.lang.Object unless something went wrong, in which case it will throw a java.lang.Exception that will need to be caught somewhere.

My question is how can I track the response (result) of the message if I urgently needed to know whether the response (result) is sent or fail to be sent.

Well, how is your server (AServer) dealing with it? You could either be trapping the exception with a try/catch block or passing it back to the caller (the class that invoked execute() and sent 3 messages in params).

Maybe that's the hint you need, the documentation for the interface XmlRpcHandler specifies that the execute() method will either return a result (as a java.lang.Object) or will throw an exception (specifically a java.lang.Exception). If the result was sent, it will be in the Object returned. If it failed, details will be in the Exception.

If you are trapping that Exception in AServer itself, then I would suggest creating an Object that you could return that will be recognized as a problem and testing for that in the calling method. If you are passing the Exception back to the invoker (which is what I would do), then I don't get the question since it should be obvious if it worked or not (you'll either get an Object back or you'll catch an Exception, which kind of answers the question doesn't it?)

Thank you very much …

I just hope I've been of some help. ;-)

Dave Stewart

Aqua~Flo Supply (Goleta CA)

dstewart at aquaflo dot com

Law of Probability Dispersal:

Whatever it is that hits the fan

will not be evenly distributed.