Callbacks in Ruby?

[Exo]

I would like to implement a callback system in Ruby.

Here is a simple example of what I mean...

Callback.fsm

(1.15 KiB) Downloaded 941 times

This doesn't work because the output method is not recognized within the class.

The benefits of this should be obvious we could send data from anywhere in the schematic to anywhere else, like sending data from low down in the hierarchy back to the top (which is what I intend to do)

So is there a way to get this to work?

[KG_is_back]

I believe the problem is, that "output" is a function of RubyEdit class. And the Callback class you've created doesn't inherit from RubyEdit, which means "output" is not declared for it.

In order for it to work, you have to send it the module it resides in when initialized... look at this fix:

Code: Select all


class Callback
def initialize(mod)
@module=mod
end


def doSomething()
    @module.output "go" , nil
end

end

@call = Callback.new(self)
output "callback", @call





[RJHollins]

alright .... you Guys are amazing

Even if I don't understand the how or why ... it's still is fascinating to try and follow new techniques.

Thanks !!

[Exo]

Ah yes thanks KG. I had a brain freeze, should have realised output was part of RubyEdit.

Thanks.

[Tronic]

why not just use the #send __send__ methods?

[Exo]

I wasn't aware of these methods. Can you give an example?

I'm not well versed in Ruby so I tend to default to doing things the 'Java' way.

[Tronic]

This is an example of __send__ method
I used the $intern_this gloabal variable to get the local instance of RubyEdit Class
to inherit it's intenal declared methods.

Callback_(Tronic).fsm

(1.16 KiB) Downloaded 921 times

[MyCo]

I used the $intern_this gloabal variable to get the local instance of RubyEdit Class
to inherit it's intenal declared methods.

This doesn't work, because $intern_this seems to point to the last edited Ruby-Edit, not to the class that contains the code.

[Tronic]

yes you're right, but I think it's a problem of FS, for as the module is initialized,
but if you retrig the class it works correctly.
the $intern_this, it seems to me, point to the current RubyEdit module.

Edit: work only for the last call of Callback class, so Myco you you're right.

[Tronic]

However my example of callback with the method __send__ works well,
the only problem is if you want to inherit the methods of class RubyEdit.