Here's a patch that adds two particularly useful methods to the IDelayedCall interface and implementation. It's quite possible to do it currently, but it's a kludge. Essentially what I added were methods to delay a DelayedCall by a configurable amount of time, and to reset a DelayedCall to happen a configurable amount of time from now. I also added a test case for each, and they pass. I can check it in if someone gives me the OK. -bob Index: twisted/internet/interfaces.py =================================================================== RCS file: /cvs/Twisted/twisted/internet/interfaces.py,v retrieving revision 1.57 diff -r1.57 interfaces.py 317a318,319

It also may be rescheduled by calling its C{delay()} or C{reset()} methods.

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def delay(self, secondsLater): """Delay the scheduled call. @param secondsLater: how many seconds from its current firing

time to delay

@raises twisted.internet.error.AlreadyCalled: if the call has

already

happened. @raises twisted.internet.error.AlreadyCancelled: if the call

has already

been cancelled. """

def reset(self, secondsFromNow): """Reset the scheduled call's timer. @param secondsLater: how many seconds from now it should

fire, equivalent

to C{self.cancel()} and then doing

another

C{reactor.callLater(secondsLater, ...)}

@raises twisted.internet.error.AlreadyCalled: if the call has

already

happened. @raises twisted.internet.error.AlreadyCancelled: if the call

has already

been cancelled. """

Index: twisted/internet/base.py =================================================================== RCS file: /cvs/Twisted/twisted/internet/base.py,v retrieving revision 1.29 diff -r1.29 base.py 48c48 < def __init__(self, time, func, args, kw, cancel): ---

def __init__(self, time, func, args, kw, cancel, reset):

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self.resetter = reset

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def reset(self, secondsFromNow): if self.cancelled: raise error.AlreadyCancelled elif self.called: raise error.AlreadyCalled else: self.time = time() + secondsFromNow self.resetter(self)

def delay(self, secondsLater): if self.cancelled: raise error.AlreadyCancelled elif self.called: raise error.AlreadyCalled else: self.time += secondsLater self.resetter(self)

266c284,290 < tple = DelayedCall(time() + seconds, f, args, kw, self._pendingTimedCalls.remove) ---

tple = DelayedCall(time() + seconds, f, args, kw,

self._pendingTimedCalls.remove, self._resetCallLater)

insort(self._pendingTimedCalls, tple) return tple

def _resetCallLater(self, tple): assert tple in self._pendingTimedCalls self._pendingTimedCalls.remove(tple)

Index: twisted/test/test_internet.py =================================================================== RCS file: /cvs/Twisted/twisted/test/test_internet.py,v retrieving revision 1.13 diff -r1.13 test_internet.py 102a103,128

def _resetcallback(self): self._resetcallbackTime = time.time()

def _delaycallback(self): self._delaycallbackTime = time.time()

def testCallLaterDelayAndReset(self): self._resetcallbackTime = None self._delaycallbackTime = None ireset = reactor.callLater(0.5, self._resetcallback) idelay = reactor.callLater(0.5, self._delaycallback) start = time.time() # chug a little before delaying while time.time() - start < 0.2: reactor.iterate(0.01) ireset.reset(0.3) idelay.delay(0.3) # both should be called sometime during this while time.time() - start < 0.9: reactor.iterate(0.01) self.assert_(0 < self._resetcallbackTime - start - 0.5 < 0.2) self.assert_(0 < self._delaycallbackTime - start - 0.8 < 0.2)

del self._resetcallbackTime del self._delaycallbackTime