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Viewing changes to vendor/Twisted-10.0.0/doc/core/howto/listings/deferred/deferred_ex8.py

  • Committer: Jesse Andrews
  • Date: 2010-05-28 06:05:26 UTC
  • Revision ID: git-v1:bf6e6e718cdc7488e2da87b21e258ccc065fe499
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vendor/Twisted-10.0.0/doc/core/howto/listings/deferred/deferred_ex8.py
 
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#!/usr/bin/env python
 
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# Copyright (c) 2009 Twisted Matrix Laboratories.
 
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# See LICENSE for details.
 
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from twisted.internet import defer
 
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from twisted.python import failure, util
 
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class Counter(object):
 
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    num = 0
 
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    let = 'a'
 
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    def incrLet(cls):
 
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        cls.let = chr(ord(cls.let) + 1)
 
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    incrLet = classmethod(incrLet)
 
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def handleFailure(f):
 
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    print "errback"
 
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    print "we got an exception: %s" % (f.getTraceback(),)
 
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    return f
 
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def subCb_B(result):
 
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    print "sub-callback %s" % (Counter.let,)
 
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    Counter.incrLet()
 
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    s = " beautiful!"
 
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    print "\tadding %r to result" % (s,)
 
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    result += s
 
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    return result
 
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def subCb_A(result):
 
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    print "sub-callback %s" % (Counter.let,)
 
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    Counter.incrLet()
 
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    s = " are "
 
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    print "\tadding %r to result" % (s,)
 
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    result += s
 
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    return result
 
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def mainCb_1(result):
 
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    Counter.num += 1
 
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    print "callback %s" % (Counter.num,)
 
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    print "\tgot result: %s" % (result,)
 
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    result += " Deferreds "
 
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    d = defer.Deferred().addCallback(subCb_A
 
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                       ).addCallback(subCb_B)
 
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    d.callback(result)
 
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    return d
 
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def mainCb_2(result):
 
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    Counter.num += 1
 
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    print "callback %s" % (Counter.num,)
 
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    print "\tgot result: %s" % (result,)
 
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def deferredExample():
 
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    d = defer.Deferred().addCallback(mainCb_1
 
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                       ).addCallback(mainCb_2)
 
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    d.callback("I hope you'll agree: ")
 
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if __name__ == '__main__':
 
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    deferredExample()
 
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