Class: Elevate::Promise

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

Constant Summary collapse

OUTSTANDING = 
0
FULFILLED = 
1

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Promise

Returns a new instance of Promise.



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# File 'lib/elevate/promise.rb', line 6

def initialize
  @lock = NSConditionLock.alloc.initWithCondition(OUTSTANDING)
  @result = nil
end

Instance Method Details

#fulfill(result) ⇒ Object 



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# File 'lib/elevate/promise.rb', line 11

def fulfill(result)
  if @lock.tryLockWhenCondition(OUTSTANDING)
    @result = result
    @lock.unlockWithCondition(FULFILLED)
  end
end

#value ⇒ Object 



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# File 'lib/elevate/promise.rb', line 18

def value
  result = nil

  @lock.lockWhenCondition(FULFILLED)
  result = @result
  @lock.unlockWithCondition(FULFILLED)

  result
end