Hi Bernd,
On Jun 4, 2010, at 1:28 AM, B. Ohr wrote:
> Hi,
>
> yesterday I did my first steps with GCD: parsing a very big CSV-file,
> processing and filtering it and displaying the result in a table view. Before
> GCD the UI was blocked for more than a minute, now the user can continue
> working instantly. Hey that’s really, really great!
:-)
> There are some issues I don’t understand:
:-(
>
> 1. @job.group.notify(Dispatch::Queue.main) {} # gives an error...
> @job.group.notify(Dispatch::Queue.concurrent) {} # …..while is working
>
> 2. @job.group.notify(Dispatch::Queue.concurrent) {} # the block is called
> twice or more times
Hmm, you should NOT need to call "group" on the @job for normal usage.
Could you just use "@job.join" to get the behavior you want?
> 3. the proxy object does not work here (I’m not sure, that I am using it
> correctly)
Yeah, the "+=" thing actually replaces the -variable- instead of mutating the
object, so it won't do what you want. Look at the README.rdoc for more details:
http://github.com/masterkain/macruby/tree/master/lib/dispatch/
Sorry about the formatting...
-- Ernie P.
>
> I made a small Xcode project demo out my project and attached it to this
> mail. (you can multi-click on the job button)
>
> - Bernd
>
> ######
>
> require 'dispatch'
>
> class AppController
>
> attr_accessor :calculations, :running
>
> def initialize
> self.calculations = []
> @prefix = 1
> @job = Dispatch::Job.new
> #the main queue is used here because the UI is bound to the
> calculations array
> @calc_queue = Dispatch::Queue.main
> end
>
> def calc_sync &block
> @calc_queue.async { block.call }
> end
>
> def nextPrefix
> prefix = @prefix
> @prefix += 1
> prefix
> end
>
> def calc1
> # @calc_proxy =
> Dispatch::Proxy.new(self.calculations,@job.group,@calc_queue)
> @job.add do
> prefix = nextPrefix
> 10.times do |i|
> dur = rand / 4 + 0.2
> sleep(dur)
> c = Calculation.new("#{prefix}:#{i}",dur)
> calc_sync { self.calculations += [c] }
> # proxy does not work here:
> # @calc_proxy += [c]
> end
> #NSLog self.calculations.inspect
> end
> # why can the notify block be called twice ore more?
> # if true
> if !running
> self.running = true
> # notifying on the main queue is crashing here:
> # @job.group.notify(@calc_queue) { NSLog "notify“; self.running =
> false }
> @job.group.notify(Dispatch::Queue.concurrent) { NSLog "notify";
> self.running = false }
> end
> end
>
> def jobAction sender
> calc1
> end
>
> def clearAction sender
> self.calculations = []
> end
>
> end
>
>
> <gcd_demo.zip>
>
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