[Twisted-Python] Re: [Zope3-dev] twisted zope
Phillip J. Eby
pje at telecommunity.com
Mon Jul 28 15:35:31 EDT 2003
At 02:42 PM 7/28/03 -0400, Shane Hathaway wrote:
>Phillip J. Eby wrote:
>>And there's yet another possible approach... Have Zope depend on
>>specific I*Reactor interfaces in place of asyncore, but don't necessarily
>>depend on Twisted itself. I'm not sure if this meets the intended goals
>>for Zope/Twisted integration, but it's a useful first step. If this is
>>useful, PEAK has an "UntwistedReactor" class that implements a useful
>>subset of the Twisted reactor interfaces, enough to be able to have a
>>select loop and scheduled callbacks. It's ZPL/PSF licensed, so you can
>>steal it fair and square. So, as long as the existing Zope 3 server code
>>just expects to be woken up by asyncore for reads and writes, it should
>>be pretty adaptable to the reactor interface, at which point it could be
>>hooked into Twisted or into a Zope 3 mini-reactor.
>That sounds great. Do you have a ViewCVS link?
Interface is at:
For the implementation, see:
It's class 'UntwistedReactor'. The implementation depends on peak.binding,
but not in any deep way. You should be able to replace most of the
'binding.bindSomehow' attributes with an __init__ method. The class also
expects to have a 'logger' attribute that's a PEP 282-compatible
logger. Last, but not least, you can interpret the 'self._delBinding()'
calls as meaning that the specified attribute should be reinitialized.
You can pretty much ignore the rest of the module for your purposes, except
the _Appt class, which is a private class representing a scheduled callback.
>The one feature that we'd need beyond the simple "wake me up when
>something is ready" interface is the trigger interface. It lets a thread
>tell the main thread to wake up immediately.
Ah. I didn't implement that, as I haven't needed it for anything. I
believe you can emulate it over the primitives I've supplied, though, as I
believe Twisted normally does it by setting up some kind of pipe or socket
that the thread writes to, with a reader hooked up on the reactor. The
reader just throws away the meaningless data, but of course the main thread
has now been reawakened from its select() call.
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