[MacRuby-devel] Creating ruby objects in Objective-C

[Alan Skipp]

Hi Eloy,
The way I'm initializing the ruby objects is with a custom class method as they must be intialized with arguments. 
For example, here is the macruby class method:

  def self.initWithPath(path, isActive:active)
    new(path, active)
  end

Which means that in Objective-C I'm using the somewhat verbose code below:

[rubyClass performSelector:@selector(initWithPath:isActive:) 
					withObject:path 
					withObject:[NSNumber numberWithBool:YES]];

If the class could be initialized without arguments then I could use:
[[rubyClass alloc] init];

But I've not tried that yet. I imagine it would be a tiny bit faster again, as it doesn't use 'performSelector'.

Alan


On 17 Jan 2011, at 17:36, Eloy Duran wrote:

> You're welcome Alan :)
> 
> Hmm, I wonder if this big impact is because of skipping evaling everytime, which iirc is the only thing that evaluateString does, or something else is happening... Have you also tried doing [rubyClass new] instead of alloc init? I thought they should do the same.
> 
> On 17 jan. 2011, at 15:57, Alan Skipp <al_skipp at fastmail.fm> wrote:
> 
>> Brilliant suggestion Eloy, much appreciated.
>> There's a noticeable improvement in speed using this technique. In the method which added ruby objects to an array, 77% of the time was spent on initialising the objects, that's now down to 35%.
>> 
>> Alan
>> 
>> On 17 Jan 2011, at 13:32, Eloy Durán wrote:
>> 
>>> After the Ruby code that defines the class has been evaled, you should be able to do the following:
>>> 
>>> Class rubyClass = NSClassFromString(@"RubyClass");
>>> id rubyObject = [[rubyClass alloc] init];
>>> 
>>> On Jan 17, 2011, at 2:05 PM, Alan Skipp wrote:
>>> 
>>>> Hi,
>>>> Is there any way to inform an Objective-C class of the existence of a ruby class so that instances can be created in Objective-C code?
>>>> Currently I am doing the following:
>>>> 
>>>> [[MacRuby sharedRuntime] evaluateString:[NSString stringWithFormat:@"RubyClass.new('%@')", arg]];
>>>> 
>>>> If I'm adding quite a few objects (300+) to an array in a loop, this line of code is quite slow. My assumption (which may be false) is that either of the 3 options below would be quicker.
>>>> 
>>>> [RubyClass performSelector:@selector(new:) withObject:arg];
>>>> [RubyClass new:arg];    
>>>> [[RubyClass alloc] initWithArg:arg];   
>>>> 
>>>> Are any of those options (or an equivalent) a possibility?
>>>> 
>>>> Alan
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