Class: Houston::Observer

Inherits:
Object
  • Object
show all
Defined in:
lib/houston_observer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Observer

Returns a new instance of Observer.



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# File 'lib/houston_observer.rb', line 6

def initialize
  @async = true
  clear!
end

Instance Attribute Details

#async ⇒ Object

Returns the value of attribute async.



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# File 'lib/houston_observer.rb', line 11

def async
  @async
end

Instance Method Details

#clear! ⇒ Object 



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# File 'lib/houston_observer.rb', line 38

def clear!
  @observers = {}
end

#fire(event, *args) ⇒ Object 



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# File 'lib/houston_observer.rb', line 30

def fire(event, *args)
  invoker = async ? method(:invoke_callback_async) : method(:invoke_callback)
  observers_of(event).each do |block|
    invoker.call(event, block, *args)
  end
  nil
end

#observed?(event) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/houston_observer.rb', line 26

def observed?(event)
  observers_of(event).any?
end

#on(event, &block) ⇒ Object 



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# File 'lib/houston_observer.rb', line 13

def on(event, &block)
  observers_of(event).push(block)
  nil
end

#once(event, &block) ⇒ Object 



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# File 'lib/houston_observer.rb', line 18

def once(event, &block)
  wrapped_block = Proc.new do |*args|
    block.call(*args)
    observers_of(event).delete wrapped_block
  end
  on(event, &wrapped_block)
end