Re: What happens to the user dictionary when coalescing notifications in NSNotificationQueue?
Re: What happens to the user dictionary when coalescing notifications in NSNotificationQueue?
- Subject: Re: What happens to the user dictionary when coalescing notifications in NSNotificationQueue?
- From: Jason Coco <email@hidden>
- Date: Thu, 25 Sep 2008 16:12:32 -0400
On Sep 25, 2008, at 16:07 , Karan, Cem (Civ, ARL/CISD) wrote:
I've got a class that acts like a super-lightweight server within my
program. It listens for incoming packets of information, decodes
them, and then tells the rest of my code that something changed. So
far, this sounds like a job for NSNotificationCenter, except that
I'm getting the packets by UDP, and don't want to tell all the
listeners about every single update that happens; it would be better
to coalesce them into one notification and notify them when the run
loop is idle. OK, so this sounds perfect for NSNotificationQueue
with (NSNoticationCoalescingOnName|NSNotificationCoalescingOnSender)
as the options. The problem is that I want to send all the data
along in the user dictionary. How is that coalesced? Note that I
want ALL the data I'm putting in the dictionary, not just the last
user dict.
You could create a method on your server class that returns the all
the data as one NSData object. So, create a mutable data object in
your server object and
every time you get a UDP packet, add that to the data and then post a
notification. When the notification gets received, the notified object
messages your server
object and retrieves all the data that way. Just make sure that the
retrieve call is properly synchronized or that everything is running
on the same thread
and you should have no problems. That's the way I would do it, anyway.
Jason
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