Class: Build::Graph::Edge

Inherits:
Object
  • Object
show all
Defined in:
lib/build/graph/edge.rb

Overview

Represents a set of inputs to a graph node.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(count = 0) ⇒ Edge

Returns a new instance of Edge.



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# File 'lib/build/graph/edge.rb', line 29

def initialize(count = 0)
  @fiber = Fiber.current
  
  # The number of inputs we are waiting for:
  @count = count
  
  @failed = []
end

Instance Attribute Details

#count ⇒ Object (readonly)

Returns the value of attribute count.



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# File 'lib/build/graph/edge.rb', line 41

def count
  @count
end

#failed ⇒ Object (readonly)

Returns the value of attribute failed.



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# File 'lib/build/graph/edge.rb', line 38

def failed
  @failed
end

#fiber ⇒ Object (readonly)

Returns the value of attribute fiber.



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# File 'lib/build/graph/edge.rb', line 40

def fiber
  @fiber
end

Instance Method Details

#failed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/build/graph/edge.rb', line 54

def failed?
  @failed.size != 0
end

#increment! ⇒ Object

Increase the number of traversals we are waiting for.



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# File 'lib/build/graph/edge.rb', line 72

def increment!
  @count += 1
end

#traverse(node) ⇒ Object

Traverse the edge, mark the edge as failed if the source was also failed.



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# File 'lib/build/graph/edge.rb', line 59

def traverse(node)
  @count -= 1

  if node.failed?
    @failed << node
  end

  if @count == 0
    @fiber.resume
  end
end

#wait ⇒ Object

Wait until all inputs to the edge have been traversed.



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# File 'lib/build/graph/edge.rb', line 44

def wait
  if @count > 0
    Fiber.yield
  end

  failed?
end