On Wednesday, 5 February 2020 08:48:41 GMT Colin Dunklau wrote: > I wasn't able to find an example in Twisted of an implicit state > machine. Maybe someone else has a concrete example somewhere?
There is an example of an explicit state machine in the twisted code for http chunked transfer encoding. Its in https://github.com/twisted/twisted/blob/trunk/src/twisted/web/ http.py#L1779 If there is code that assumes that it can react directly off of the events from a framework like twisted. When events happen in an unexpected sequence you can end with errors. For example you can get a connectionLost event at any time. If you have a state machine it is easy to know what the clean actions will be. But if there is no explicit state the code may not have the information it needs to handle the connectionLost in an appropriate ways. The situation with states and events only gets more complex when there are deferred's that run after a connectionLost event and assume a connect is still live. If such a deferred can check an explicit state it is far easier to make the code work appropriately. Barry _______________________________________________ Twisted-Python mailing list Twisted-Python@twistedmatrix.com https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
