Module: Joggle::Pablotron::Observable

Included in:
Engine, Jabber::Client, Cache, Twitter::Engine
Defined in:
lib/joggle/pablotron/observable.rb

Defined Under Namespace

Classes: StopEvent

Instance Method Summary collapse

Instance Method Details

#fire(ev, *args) ⇒ Object 



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# File 'lib/joggle/pablotron/observable.rb', line 32

def fire(ev, *args)
  d = lazy_observable_init
  ret = true

  # get handlers for this event
  handlers = d[:handlers][ev]

  begin 
    if handlers.size > 0
      handlers.each do |handler| 
        if fn = handler[:fn]
          # run handler
          fn.call(self, ev, *args)
        else
          # FIXME: do nothing, is this an error?
        end
      end
    end

    # get object handlers
    handlers = d[:object_handlers]

    if handlers.size > 0
      handlers.each do |handler|
        if o = handler[:obj]
          # build method symbol
          meth = "on_#{ev}".intern

          # check for method
          if o.respond_to?(meth)
            o.send(meth, self, *args)
          end
        else
          # FIXME: do nothing, is this an error?
        end
      end
    end
  rescue StopEvent => err
    fire(ev + '_stopped', err, *args)
    ret = false
  end

  # return result
  ret
end

#on(ev, &block) ⇒ Object 



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# File 'lib/joggle/pablotron/observable.rb', line 6

def on(ev, &block)
  d = lazy_observable_init

  # get next id and create new handler
  ret = (d[:next_id] += 1)
  h = { :id => ret }

  # set handler type
  if ev.kind_of?(String) && block
    h[:fn] = block

    # add handler to handler list and id to id lut
    d[:handlers][ev] << h
    d[:id_lut][ret] = ev

  elsif !ev.kind_of?(String) && !block
    h[:obj] = ev
    d[:object_handlers] << h
  else
    raise "missing listener block"
  end

  # return id
  ret
end

#un(id) ⇒ Object 



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# File 'lib/joggle/pablotron/observable.rb', line 78

def un(id)
  d = lazy_observable_init

  # look in event handlers
  if ev = d[:id_lut][id]
    d[:handlers][ev].reject! { |fn| fn[:id] == id }
  end

  # check object handlers
  d[:object_handlers].reject! { |o| o[:id] == id }

  nil
end