Re: Drb / ActiveRecord as Application Server for Qt/Ruby cli

Logan C. wrote:

  • Distributed Ruby Server
    Is it safe and robust, anyway, on an intranet composed of a hundred
    across the network, why even have a server / client
    architecture? Just stick the AR code in the “Client” and let
    PostgreSQL worry about concurrency.

I prefer a 3-tier approach, with all the buisness logic on the server,
just like you would do with J2EE. Centralisation of code is a good thing
I think.

On Aug 4, 2006, at 12:20 PM, Philippe L. wrote:

I prefer a 3-tier approach, with all the buisness logic on the
server, just like you would do with J2EE. Centralisation of code is
a good thing I think.

You’re already using ActiveRecord…why not throw the rest of the
Rails stack in and use REST, XML-RPC or SOAP?

Quoting A. Keys [email protected]:

On Aug 4, 2006, at 12:20 PM, Philippe L. wrote:

I prefer a 3-tier approach, with all the buisness logic on the
server, just like you would do with J2EE. Centralisation of code is
a good thing I think.

You’re already using ActiveRecord…why not throw the rest of the Rails
stack in and use REST, XML-RPC or SOAP?

The problem with QtRuby and DRb, XML-RPC, EventMachine, etc is each
one of them has its own event loop.

Once you call $qapp.exec in QtRuby, you application enters the Qt
event loop and you cannot call anything outside that loop. The same
goes for XMLRPC4R and the server.serve call: once you call
myserver.serve, your application waits in an event loop, so you cannot
run $qapp.exec because QtRuby does not work with Ruby threads. The
only approach you can take to “fix” this is described here:
http://rubyforge.org/forum/message.php?msg_id=3329

The explanation is here:
http://rubyforge.org/forum/message.php?msg_id=3341

But you should realize this is more of an accident than a feature.

The best solution for this problem is to implement your own protocol
using QtRuby. If your QtRuby application is actually a Korundum
application, another approach would be to have two independent
applications (the Korundum app and the XML-RPC/EventMachine/whatever
listener) and have them communicate through DCOP. If your application
is a QtRuby 4 one, you may use DBUS as well but take in account the
Ruby-DBUS bindings are quite old.

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