Class: Async::LimitedQueue

Inherits:
Queue show all
Defined in:
lib/async/queue.rb

Instance Attribute Summary collapse

Attributes inherited from Queue

#items

Instance Method Summary collapse

Methods inherited from Queue

#async

Methods inherited from Notification

#signal

Methods inherited from Condition

#empty?, #signal, #wait

Constructor Details

#initialize(limit = 1) ⇒ LimitedQueue

Returns a new instance of LimitedQueue.



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# File 'lib/async/queue.rb', line 60

def initialize(limit = 1)
	super()
	
	@limit = limit
	@full = Async::Queue.new
end

Instance Attribute Details

#limit ⇒ Object (readonly)

Returns the value of attribute limit.



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# File 'lib/async/queue.rb', line 67

def limit
  @limit
end

Instance Method Details

#dequeue ⇒ Object 



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# File 'lib/async/queue.rb', line 82

def dequeue
	item = super
	
	@full.enqueue(nil) unless @full.empty?
	
	return item
end

#enqueue(item) ⇒ Object 



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# File 'lib/async/queue.rb', line 74

def enqueue item
	if limited?
		@full.dequeue
	end
	
	super
end

#limited? ⇒ Boolean

Returns Whether trying to enqueue an item would block.

Returns:

  • (Boolean) —

    Whether trying to enqueue an item would block.



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# File 'lib/async/queue.rb', line 70

def limited?
	@items.size >= @limit
end