Message: 2 Date: Mon, 30 Mar 2009 11:10:48 -0400 From: "Doug Farrell" <dfarrell@mypublisher.com> Subject: [Twisted-Python] RE: how to create state machines? To: <twisted-python@twistedmatrix.com> Message-ID: <318F79422ADC5041A93343721F84474D01A8BD68@exchange.mypublisher.local> Content-Type: text/plain; charset="us-ascii"

[Doug Farrell] Thank you very much for your detailed response,

You are welcome Doug.

One thing I'm still a little confused by in your reply is how you're getting the deferred instance. Is there a particular reason your example does this:

deferred = someOtherFunctionThatReturnsADeferred()

Yes. There are Twisted methods that return a Deferred. For instance, client.getPage() or in the case of a XMLRPC client, proxy.callRemote(). def processPage(data): # do stuff with the web page here deferred = client.getPage("http://wwww.google.com") deferred.addCallback(processPage)

rather than this: deferred = defer.deferred()

Sometimes you want to create your own deferred and trigger it with a callback(). Cheers, Andrew