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Thread: Looking for a way to emulate network application

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    Default Looking for a way to emulate network application

    Hi there,

    I am currently testing the networking part of an application. Its a typical Client-Server architecture.
    I want to test whether all the data is correctly synchronized on all clients at any point in time. For this purpose I want to leave the system running with multiple clients.
    The problem is, this is very hard for me to test. I can not create multiple clients on a single machine because every port can only be used once.
    So I have to test with multiple machines, but I dont always have access to all of them and administrating the test across multiple machines is also tedious.

    So I would like to know whether there is some kind of library out there which can be used to emulate the java ServerSocket and Socket classes in a way that it is indenticle to actual network traffic but running on only a single machine.

    Any help would be greatly appreciated.


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    Default Re: Looking for a way to emulate network application

    A number of simple virtual machines?

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    Default Re: Looking for a way to emulate network application

    Yes, just regular JVM's running a Client-Server application.
    I would just need some kind of library that would emulate TCP Sockets / ServerSockets on a single machine. Possibly with files.
    Performance is not important, just correctness. It needs to be an exact duplicate of regular Socket communication.

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    Default Re: Looking for a way to emulate network application

    Ideally, the client-server communications would use a listen-select model, where the clients are given an ephemeral port after the initial connect to the advertised port. That is, clients should not be using a fixed port, and servers should do all actual communication with clients over a negotiated port that is not the listen port.

    Then you can script as many clients as your memory allows.

    If you can't change the client code, then you you might be able to find or write a multiplexer shim service that brokers the connects between clients and server, handling all the fixed port stuff. I have no idea if such a thing exists, but it would be a neat tool.

    Really, though. Clients should not use a fixed port. Very firewall unfriendly, among other problems.
    Last edited by jdv; August 5th, 2014 at 02:16 PM. Reason: That was weird. Double-post

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