Phillip J. Eby wrote: > At 01:51 PM 6/25/2007 -0700, Robert Brewer wrote: > >Seriously, though, this handles the notification but not the state > >machine, which I think is critical to the effort. It also > doesn't do any > >error-handling for misbehaving subscribers, so not all > subscribers are > >guaranteed to run if there's an unhandled error in an earlier > >subscriber. > > Again, it would be really helpful if you could provide some scenarios > that show why these things are important. It's not immediately > obvious to me that they are.
I replied with some in another email, it's just being slow. > For example, if an error occurs, isn't that an indication that the > component is broken? Masking the failure just makes it less likely > the component will get fixed in a timely manner. Yes, the component is broken. However, at runtime, breakage in a CherryPy component shouldn't keep a Quixote component from, say, correctly freeing its DB connections. The Bus implementation I posted logs every failure, and then raises the last one. If we need more notification than a site log, I think that can be added, either with an optional argument to bus.log(), or with a custom subscriber to the 'log' channel. > Meanwhile, if you get a start call, you must be starting, right? So > why worry about the state? It'd be simpler to just use > "before/during/after" messages the way Twisted does. Your "block" > example could be replaced by waiting for the "after" message of the > desired state, for example. That's a possible way to go. My intention was to support both 1) examination of the state by external components (for operations other than 'block'--progress meters spring to mind) and 2) restrict some state transitions if necessary; for example, make bus.start() do nothing (or block) unless the state is "STOPPED". Robert Brewer System Architect Amor Ministries [EMAIL PROTECTED] _______________________________________________ Web-SIG mailing list Web-SIG@python.org Web SIG: http://www.python.org/sigs/web-sig Unsubscribe: http://mail.python.org/mailman/options/web-sig/archive%40mail-archive.com
