[Tutor] More assistance with queues and global variables

[Tino Dai]

On 7/5/06, Kent Johnson <kent37 at tds.net> wrote:
>
> Tino Dai wrote:
> > Hi All,
> >
> >      My project is almost working (and without global variables!), and
> > there is one more hurdle that I want to jump. That is using the
> > SocketServer module and passing a queue (or for that matter any kind
> > of variable) to the handle method. I took a look at SocketServer to
> > see what classes I need to override/extend, and see that I will be
> > need to extending a couple of inits and methods out of the TCPServer
> > and the BaseServer class. I don't see an easy way to do this [passing
> > in a variable] , so I figured that I would extend the classes. I can
> > to realize that I would be extending not only the base TCPServer class
> > but also the BaseServer class. My question is: When I extend those
> > classes, can I put all the methods from both of the classes into my
> > own extended class or would I need to do something funky?
> If I understand correctly, you want the server to have a queue that is
> shared among requests. You can do this without replacing any of the
> functions below. I would pass the queue to the __init__() method of your
> server class, override finish_request() to pass the queue to the request
> handler, the request handler __init__() just saves the queue for access
> by the handle() method. Something like this:
>
> class MyServer(TCPServer):
>   def __init__(self, server_address, RequestHandlerClass, queue):
>     TCPServer.__init__(self, server_address, RequestHandlerClass)
>     self.queue = queue
>
>   def finish_request(self, request, client_address):
>         """Finish one request by instantiating RequestHandlerClass."""
>         self.RequestHandlerClass(request, client_address, self, self.queue
> )
>
>
> class MyRequest(BaseRequestHandler):
>   def __init__(self, request, client_address, server, queue):
>     BaseRequestHandler.__init__(self, request, client_address, server)
>     self.queue = queue
>
>   def handle(self):
>     # do something with self.queue
>
> Kent


Do you ever wish that you could pull back an email? This is one of those
times. I got the same exact solution as you about 30 minutes ago. I did have
to switch the lines in BaseRequestHandler and self.queue for it to work.
Thanks!

-Tino
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