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Article:
  jRendezvous: Java and Rendezvous Working Together
Subject:   server patch broke jrendezvous?
Date:   2003-10-22 01:24:12
From:   sethladd1
Response to: server patch broke jrendezvous?

Hi,


It's quite possible that the "patch" I provide only does handle that one case. I'm glad you found a way around it. Honestly I haven't approached this topic in a long time. I hope one day someone is able to collect all these patches and knowledge and release a new version of the library. It looks like people find it useful!


Thanks,
Seth

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Showing messages 1 through 2 of 2.

  • server patch broke jrendezvous?
    2003-10-22 15:14:37  anonymous2 [View]

    hi seth, after looking through your changes a bit more I don't think I entirely understand your motivation to make the changes you did. your changes make it so tomcat returns an address such as
    http://foo.example.com
    rather than
    http://seth-ladds-computer.local./index.html

    however I'm not sure this is a useful change for two reasons:
    (a) mod_apache_rendezvous does not exhibit this behaviour, so why
    should tomcat try to do something different?
    (b) and more importantly any browser capable of doing rendezvous
    service discovery should be quite able to handle a URL
    of the second type. you say on page one of the article:
    "While this server name resolves to a physical IP address,
    clients should never cache that address. Rendezvous works so
    well because services may move around on the network, even
    changing IP addresses. Clients should cache the Service
    Instance Name instead, allowing the service the flexibility
    of movement."
    from that I understand that the _correct url for this service
    is the latter type, as it will still be correct even if the
    service is no longer available on foo.example.com. I guess
    the argument could be made that seth-ladds-computer might
    not always be valid either, but one would think that if you've
    found the resource via rendezvous, you continue to locate it
    in that manner, and if you've found the resource via some other
    means then you should stick with that access type.
    • server patch broke jrendezvous?
      2003-10-23 00:56:18  anonymous2 [View]

      ohh man, this is a mess. I don't know if I can fix this without spending some solid time with the zeroconf protocol spec (which I can't seem to find) and a lot of println()s. apparently you were on the right direction by adding the server field as that's what the TYPE_A records are keyed on. however this means that back in the Rendezvous class we need to register the TYPE_A dnsrecord using the server name rather than the service name. this causes some problems for later lookups in handleQuery() as services are queried by service name, not server name.