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[REBOL] Re: Rugby doco - wip

From: brett:codeconscious at: 29-Jan-2002 0:18

Hi Maarten,
> > - What is hard for people is the notion of async programming > > Well up I have to admit I'll need to get it clear in my mind to be able to > write about it :)
Ok, I've been looking in to this a little. It essence it is event-driven programming. A View GUI application is an application that handles asynchronous events - user actions like mouse + keyboard. These events are produced by the user in response to requests (screen displays) made by the application. A twisted view perhaps, but reasonable is it not? View gives developers three features to handle these asynchronous events: *event types *the "Feel" object with its event classification methods and a dispatch system to call them *the event processing chain through "insert-event-func" Rugby handles asynchonous network events and gives the developer: * a ticket number *a function to check if a result is available for a given ticket * a function to retrieve the result associated with a given ticket Thus a big difference for understanding the two is that: * View makes an event "concrete" using objects and it dispatches these events to developer defined functions. *Rugby "eats" the event and instead focusses on providing a pidgeon hole (ticket) for the function results. This means that currently a Rugby developer has to, in effect, re-create the consumed event through polling. I wonder then, if Rugby provided a dispatch system, whether it would be more understandable. Please note, I'm quite unaware of the impact on the Rugby design this idea implies. What do you think? I'm prepared to be told that I've missed something crucial and valuable :) Brett.