Module: Plumbing::Pipeline::Operations

Defined in:
lib/plumbing/pipeline/operations.rb

Overview

Defining the operations that will be performed on the input data

Instance Method Summary collapse

Instance Method Details

#_call(input, instance) ⇒ Object

Internal use only



33
34
35
36
37
38
39
40
41
42
 
# File 'lib/plumbing/pipeline/operations.rb', line 33

def _call input, instance
  validate_contract_for input
  validate_preconditions_for input
  result = input
  operations.each do |operation|
    result = operation.as(Callable).call(result, instance)
  end
  validate_postconditions_for result
  result
end

#execute(method) ⇒ Object

Add an operation which does not alter the input data to the pipeline The output from the previous operation is fed in as the input to the this operation but the output from this operation is discarded and the previous input is fed in to the next operation

Parameters:

  • method (Symbol) —

    the method to be called on the input data



24
25
26
27
28
29
30
 
# File 'lib/plumbing/pipeline/operations.rb', line 24

def execute method
  implementation ||= ->(input, instance) do
    instance.send(method, input)
    input
  end
  operations << implementation
end

#perform(method, using: nil) {|Object| ... } ⇒ Object

Add an operation to the pipeline Operations are processed in order, unless interrupted by an exception The output from the previous operation is fed in as the input to the this operation and the output from this operation is fed in as the input to the next operation

Parameters:

  • method (Symbol) —

    the method to be called on the input data

  • using (String, Class) (defaults to: nil) —

    the optional class name or class that will be used to perform the operation

  • &implementation (Block) —

    the optional block that will be used to perform the operation (instead of calling a method)

Yields:

  • (Object) —

    input the input data to be processed

Yield Returns:

  • (Object) —

    the output data



15
16
17
 
# File 'lib/plumbing/pipeline/operations.rb', line 15

def perform method, using: nil, &implementation
  using.nil? ? perform_internal(method, &implementation) : perform_external(method, using)
end