On Sep 23, 10:47 am, Stuart Sierra <[EMAIL PROTECTED]>
wrote:
> On Sep 23, 9:50 am, Rich Hickey <[EMAIL PROTECTED]> wrote:
>
> > I've added some support for agent watches. You should consider it
> > experimental, but it will allow the creation of cell-like and other
> > reactive systems.
>
> Cool, thanks Rich! This will be fun to play with. One question -- is
> it possible to get the previous value of the agent (before the action)
> from within the callback fn?
>
It would be possible, but I'd like to hear more about why it is a good
idea. It seems to me to be a potential violation of encapsulation to
transmit state as part of a fundamental API. Many agents will/should
have a set of functions one should use to access their state, for
instance. If the main use is to see if something has changed, that's
covered by the boolean.
> I noticed this -- if a callback throws an exception, the agent stops
> accepting messages, but agent-errors remains empty:
>
I'll look into how best to handle that. I think logically it's not a
problem of the agent itself, but it shouldn't get lost either.
I've been thinking about adding error streams for agents, so an
application could have agent-related exceptions put on one or more
queues for centralized handling...
Rich
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