Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked

Re^2: Event loop with rules handling

by Brovnik (Hermit)
on Nov 04, 2004 at 12:39 UTC ( #405155=note: print w/ replies, xml ) Need Help??

in reply to Re: Event loop with rules handling
in thread Event loop with rules handling

All good questions. I'm early enough in the cycle that I haven't made the decision on a lot of this stuff yet, but, here goes :

  1. External events will prob. be either via signals for occasional triggers, or using sockets for regular changes.
  2. Whether to iterate over all rules is really a performance issue. One option is a register of variable that would change per rule, so on a change, only those affected would need to be evaluated. I expect the eval loop to be so quick though that this won't be needed initially
  3. Picking up rules - There would be a set of startup rules. Some would need to be created dynamically. My ideal would be to parse non-Perl expressions and interpret them.
  4. Triggers on DB columns - I considered this, but don't want the business logic encoded in the DB. What would be ideal is for e.g. a new/changed row in a DB to trigger an external event to prompt the Watcher to reevaluate. The DB will be MySQL, not sure if this would be possible with callbacks. May need some homework.

Comment on Re^2: Event loop with rules handling

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://405155]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others perusing the Monastery: (2)
As of 2015-11-29 09:08 GMT
Find Nodes?
    Voting Booth?

    What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

    Results (750 votes), past polls