Groups > comp.lang.java.programmer > #34562

Re: Picking an unused port number

From	Nigel Wade <nmw@ion.le.ac.uk>
Newsgroups	comp.lang.java.programmer
Subject	Re: Picking an unused port number
Date	2016-06-08 10:32 +0100
Message-ID	<drq71jFb52jU1@mid.individual.net> (permalink)
References	(4 earlier) <nj4u4n$siu$1@dont-email.me> <drnfpkFp1n5U1@mid.individual.net> <nj6miv$1oi$1@dont-email.me> <drob1bFueveU1@mid.individual.net> <nj6tek$so7$1@dont-email.me>

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One more point. The rmiregistry is not necessarily an external application which you have to run separately. You can 
make your server application its own rmiregistry, or use an external registry is one is available.

All that's required for RMI to work is that the client knows what port the rmiregistry (with which the RMI server has 
registered) is listening on. After that the rest is up to you. You can make your server an RMI server, or just use an 
RMI wrapper to deliver the assigned port number to the client, which can then use that port number to connect to a 
traditional Socket server. Once RMI is being used you can add as many services to it as you deem necessary.

My main usage for RMI is delivering real-time radar data to the internet. Each data channel from each radar has a 
separate RMI server, each of which register with the rmiregistry. When a client wants data from a particular radar it 
queries rmiregistry to get a Remote interface to the RMI server. This interface includes the methods for requesting data 
from the RMI server.

Personally, I don't trust rmiregistry over the Internet, so rmiregistry is blocked by the firewall for anything other 
than local networks. For remote access I use a GenericServlet inside Tomcat which accepts requests, uses rmiregistry to 
locate the relevant radar data server, reads the requested data and returns the result as a serialized Java object.

Thread

Re: Picking an unused port number nathanturner369@gmail.com - 2016-06-04 08:24 -0700
  Re: Picking an unused port number Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2016-06-04 09:56 -0700
    Re: Picking an unused port number Eric Douglas <e.d.programmer@gmail.com> - 2016-06-06 05:28 -0700
      Re: Picking an unused port number Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2016-06-06 15:40 -0700
        Re: Picking an unused port number Nigel Wade <nmw@ion.le.ac.uk> - 2016-06-07 09:43 +0100
          Re: Picking an unused port number Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2016-06-07 07:43 -0700
            Re: Picking an unused port number Nigel Wade <nmw@ion.le.ac.uk> - 2016-06-07 17:28 +0100
              Re: Picking an unused port number Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2016-06-07 09:40 -0700
                Re: Picking an unused port number Nigel Wade <nmw@ion.le.ac.uk> - 2016-06-08 10:32 +0100
                Re: Picking an unused port number Eric Douglas <e.d.programmer@gmail.com> - 2016-06-08 06:45 -0700
                Re: Picking an unused port number Nigel Wade <nmw@ion.le.ac.uk> - 2016-06-08 15:06 +0100
                Re: Picking an unused port number Eric Douglas <e.d.programmer@gmail.com> - 2016-06-08 07:36 -0700
                Re: Picking an unused port number Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-08 18:03 +0000
  Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-04 20:50 -0400
    Re: Picking an unused port number Wayne <wayne@nospam.invalid> - 2016-06-06 18:44 -0400
      Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-06 20:52 -0400
        Re: Picking an unused port number Arne Vajhøj <arne@vajhoej.dk> - 2016-06-06 21:28 -0400
          Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-06 21:45 -0400
            Re: Picking an unused port number Arne Vajhøj <arne@vajhoej.dk> - 2016-06-06 23:07 -0400
              Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-07 09:50 -0400
                Re: Picking an unused port number Lew <lewbloch@gmail.com> - 2016-06-07 13:46 -0700
                Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-07 19:31 -0400
                Re: Picking an unused port number Lew <lewbloch@gmail.com> - 2016-06-07 17:26 -0700
                Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-07 21:34 -0400
                Re: Picking an unused port number Lew <lewbloch@gmail.com> - 2016-06-08 13:52 -0700
                Re: Picking an unused port number Jerry Stuckle <jstucklex@attglobal.net> - 2016-06-08 17:49 -0400
                Re: Picking an unused port number Arne Vajhøj <arne@vajhoej.dk> - 2016-06-07 21:53 -0400
        Re: Picking an unused port number a.laforgia@gmail.com - 2016-06-07 00:11 -0700

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