Re: [Twisted-Python] combining addCallback and callLater ?

16 Dec 2008

      Hi,

Arye wrote:
...
I would like to add a callback that delays the chain. In other words I would
like to combine:
defer.Deferred().addCallback
and reactor.callLater
The only solution I came up with was the code below.
There must be a more elegant way to do this.
Any ideas would be greatly appreciated,
All the best,
*************************begin
from twisted.internet import reactor, defer
def printResults(results, arg):
    print "In printResults results=", results
    print "In printResults arg=", arg
    if arg == 2:
        reactor.stop()
def fireLater(results, d2):
    print "In fireLater results=", results
    reactor.callLater(5, d2.callback, "firelater")
d1 = defer.Deferred()
d2 = defer.Deferred()
d2.addCallback( printResults, 1)
d2.addCallback( printResults, 2)
d1.addCallback(fireLater, d2)
d1.callback("fire")
reactor.run()
*************************end
I've already written this some times:

d1.addCallback(5, reactor.callLater, d2.callback, "firelater")

Hope this, helps,

-- 
Amaury Forgeot d'Arc