Class: Async::Waterfall

Inherits:
Object
  • Object
show all
Defined in:
lib/motion-asyncx/async.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Waterfall

Returns a new instance of Waterfall.



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# File 'lib/motion-asyncx/async.rb', line 4

def initialize
  @blocks = []
  @on_error = nil
  @on_success = nil
  @current = 0
end

Instance Attribute Details

#blocks ⇒ Object

Returns the value of attribute blocks.



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# File 'lib/motion-asyncx/async.rb', line 3

def blocks
  @blocks
end

Class Method Details

.do(&block) ⇒ Object 



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# File 'lib/motion-asyncx/async.rb', line 28

def self.do(&block)
  chain = Waterfall.new
  chain.blocks << block
  chain
end

Instance Method Details

#and_then(&block) ⇒ Object 



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# File 'lib/motion-asyncx/async.rb', line 34

def and_then(&block)
  @blocks << block
  self
end

#next_block(previous_result = nil) ⇒ Object 



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# File 'lib/motion-asyncx/async.rb', line 11

def next_block(previous_result=nil)
  block = @blocks[@current]
  completion = lambda do |result=nil, error=nil|
    if error
      @on_error.call(result, error) if @on_error.is_a?(Proc)
    else
      @current += 1
      if @blocks.length > @current
        next_block(result)
      elsif @on_success.is_a?(Proc)
        @on_success.call(result)
      end
    end
  end
  block.call(completion, previous_result)
end

#on_error(&block) ⇒ Object 



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# File 'lib/motion-asyncx/async.rb', line 44

def on_error(&block)
  @on_error = block
  self
end

#on_success(&block) ⇒ Object 



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# File 'lib/motion-asyncx/async.rb', line 39

def on_success(&block)
  @on_success = block
  self
end

#start ⇒ Object 



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# File 'lib/motion-asyncx/async.rb', line 49

def start
  next_block()
end