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From "Simon Hardy-Francis" <>
Subject Re: xml-rpc for local communication ?
Date Wed, 12 Jun 2002 14:45:01 GMT
Dear Felix,

If I understand correctly then you wish to have n Perl processes calling a single Java process
which spawns a thread for each call, processes something in the thread, and then calls back
to the original Perl caller in order to pass back the results, right?

In this case both Perl & Java processes need to be set up as XML RPC servers (in order
to create this type of asynchronous calling behaviour which is AFAIK not supported by the
Perl XMLRPC implementations). One way to enable the Java threads to call back with the results
is to put the XMLRPC server of each Perl process on a different port. When the Perl process
calls the Java process then the Perl process can pass its port number as an argument, and
perhaps also a unique identifier in case it invokes more than one Java worker thread. This
way, when the Java thread calls back then it can pass the same identifier back as an argument
in order to identify itself.

Hope this helps,

With kind regards,


> Hi everyone,
> I'm currently developing a rather local (it will probably run on the same
> machine) client-server system to couple perl with java. The result shall be
> this scenario:
> - a Perl task sends a message to a Java class to create a new rpc client
> thread
> - the Java client does rpc's at a server implemented by Perl
> - the Perl task continues when Java has done the work
> there can be many instances of perl tasks and java threads, but each client
> belongs to exactly one server
> Because of the standardisazion I prefer existing protocolls instead of an
> own implementation of socket communication so I've implemented apache xml-rpc
> (for testing the server is currently also implemented in java).
> Now there's a problem: xml-rpc seems to open a new connection for every
> procedure call so the client doesn't know which server task it belongs to and vv
> when more than one procedure call is done. Is there a solution to use the
> same connection for a particular client-server instance until the Java client
> side has finished ?
> If not, how can I realize many client-server instances (in own threads) so
> that one client belongs to one server and is 100% identificated  ?
> Is xml-rpc the right thing for a local communtication or is it rather only
> appropiate for web-services or long distance communication ?
> Thanks and bye
> Felix

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