ServiceObject.IsValid() method

[Robert Olson]

Hm. The price you pay is an expensive roundtrip to verify if you have the 
object you're looking for, rather than just handling the exception when you 
have it wrong.

--bob

At 01:55 PM 2/8/2003 -0600, Ivan R. Judson wrote:

>I don't know. The behavior I'm trying to avoid is that a client object
>(result of ...get_proxy() isn't really anything until a call is made, but if
>that call fails your down the error handling path -- you'd really like to
>know if the handle is valid ahead of time in some cases...
>
>Does that make it any more clear?  The words that come to mind are "you want
>to know you have a valid proxy object before you use it", but I'm not sure
>that helps make it more clear :-)
>
>--Ivan
>
> > -----Original Message-----
> > From: Robert Olson [mailto:olson at mcs.anl.gov]
> > Sent: Saturday, February 08, 2003 1:38 PM
> > To: judson at mcs.anl.gov; 'AG Dev'
> > Subject: Re: ServiceObject.IsValid() method
> >
> >
> > is that doing the same thing as isinstance(obj, ServiceObject) ?
> >
> > At 01:32 PM 2/8/2003 -0600, Ivan R. Judson wrote:
> > >I propose we add amethod IsValid() to the service object
> > that returns
> > >true. Then you can verify that your handle is good *before*
> > you try to
> > >use it. This makes it significantly easier to handle cases
> > like venue
> > >entering...
> > >
> > >Thoughts?
> >