I would love to see a publish and subscribe system in the engine for use
in Standalone.
I've written a LCS library for for publish and subscribe within our
commercial apps, but would toss it in an instant for a good engine
implementation.
Beyond abstracted commands like:
revIDESubscribe "helloworld" -> subscribe <messageName>
ideMessageSendWithParameters "helloworld" -> publish <messageName> with
<parameters>, which could just be existing "send" or "dispatch"
You need a general suppress messages/unsuppress messages, which we have
as "lock messages" and "unlock messages" already in the language.
You also need an "unsubscribe <messageName>" and a "lock <messageName>
messages [for <object>]" / "unlock <messageName> messages [for
<object>]" to allow suppression/unsuppression of a specific message for
all objects or for specific object.
We already have "the pendingMessages" and "cancel", but you would also
want to add "the subscribers [of <messageName>]" for a list of long IDs
of objects and their messages or filtered for a specific message
subscribed to and "the publishers [of <messageName>]" for a similar list
of object IDs when the messages they publish or filtered for a specific
message.
Or perhaps I have been thinking too much about this!
On 10/2/2019 8:58 AM, Tom Glod via use-livecode wrote:
thats what i'm thiking about..its only documented in the "create a plugin"
sections. But having this in standalones would be a bit of news.
So every message the engine sends is checked to see if there is a
subscription to that message and then all objects ( whether in the path or
not. ) that are subscribed would receive a message that this message was
triggered. That is pretty cool!
On Wed, Oct 2, 2019 at 8:53 AM Paul Dupuis via use-livecode <
use-livecode@lists.runrev.com> wrote:
On 10/1/2019 11:52 PM, Mark Wieder via use-livecode wrote:
I have finally gotten around to noticing that LC9.x builds have opened
the publish-and-subscribe mechanism to arbitrary messages. I'm not
sure when this happened and I'm really not inclined to go searching
through all those release notes, but I'm ecstatic over the surprise
discovery. This means objects can register interest in certain
messages to do something like
object1:
revIDESubscribe "helloworld"
object2:
revIDESubscribe "helloworld"
object3:
ideMessageSendWithParameters "helloworld"
and both object1 and object2 will get notifications, fully
implementing the Publish-and-Subscribe design pattern.
Thank you team.
Have you tested this is a standalone?
I thought (probably incorrectly) that revIDE... functions/commands were
only available when running in the IDE?
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