Class: Build::Graph::Task

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

Overview

A task is a specific process and scope applied to a graph node.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(controller, walker, node) ⇒ Task

Returns a new instance of Task.



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# File 'lib/build/graph/walker.rb', line 129

def initialize(controller, walker, node)
  @controller = controller
  @node = node
  @walker = walker

  # If the execution of the node fails, this is where we save the error:
  @error = nil

  @children = []
end

Instance Attribute Details

#children ⇒ Object (readonly)

Returns the value of attribute children.



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# File 'lib/build/graph/walker.rb', line 140

def children
  @children
end

Instance Method Details

#exit ⇒ Object 



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# File 'lib/build/graph/walker.rb', line 171

def exit
  if @error || any_child_failed? || any_inputs_failed?
    @node.fail!
  elsif wet?
    @node.clean!
  end
  
  @walker.exit(@node)
  
  @walker.count += 1
end

#inputs ⇒ Object 



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# File 'lib/build/graph/walker.rb', line 142

def inputs
  @node.inputs
end

#outputs ⇒ Object 



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# File 'lib/build/graph/walker.rb', line 146

def outputs
  @node.outputs
end

#visit ⇒ Object

Derived task should override this function to provide appropriate behaviour.



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# File 'lib/build/graph/walker.rb', line 155

def visit
  wait_for_inputs

  # If all inputs were good, we can update the node.
  unless any_inputs_failed?
    begin
      yield
    rescue TransientError => error
      $stderr.puts Rainbow("Error: #{error.inspect}").red
      @error = error
    end
  end

  wait_for_children
end

#wet? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/build/graph/walker.rb', line 150

def wet?
  @node.dirty?
end