Class: Datapipes::Tube

Inherits:
Object
  • Object
show all
Defined in:
lib/datapipes/tube.rb

Overview

Tube takes effect data which passes through pipe.

Build your own tube logic in ‘run` method.

Instance Method Summary collapse

Instance Method Details

#>>(op2) ⇒ Object

_>>_ is used to compose tubes. See usage in examples.

Tube composition satisfies associative law. See more in spec.



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# File 'lib/datapipes/tube.rb', line 9

def >>(op2)
  op1 = self
  Tube.new.tap do |o|
    o.define_singleton_method(:run) do |data|
      op2.run(op1.run(data))
    end
  end
end

#run(data) ⇒ Object

Override this in sub class.

run recieves any data, so you have to ignore unexpected data.

def run(data)
  if accept? data
    [data, data, data]
  else
    data
  end
end

 def accept?(data)
   data.is_a? Integer and data > 3
 end

Don’t forget to return data in else clause.



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# File 'lib/datapipes/tube.rb', line 36

def run(data)
  data
end