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process_chain.rb
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process_chain.rb
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# frozen_string_literal: true
require 'process_chain/version'
require 'hashie'
# Base module for process chains
module ProcessChain
# :nodoc:
def self.included(base)
base.send :include, InstanceMethods
base.instance_eval do
attr_reader :results
end
end
# :nodoc:
module InstanceMethods
# Constructor
# @param input [Hash] input data for process
# @param success [true false] result of latest process
# @raise [ArgumentError] when input is not a Hash
# @return a new instance of class
def initialize(input: {}, success: true)
raise ArgumentError, '"input" should be a Hash' unless input.is_a? Hash
@success = success
@results = Hashie::Mash.new input
end
# @return [true false]
def success?
@success
end
# Execute passed code block if chain is success
# @yield code block to be executed on success
def if_success
return self unless success?
yield if success?
end
# Execute passed code block if chain is not success
# @yield code block to be executed on fail
def if_fail
return self if success?
yield
end
# Returns a new success instace of chain
# @param results [Hash] a new input for next process
def return_success(results = nil)
self.class.new input: build_new_result(results)
end
# Returns a new fail instace of chain
# @param results [Hash] a new input for next process
def return_fail(results = nil)
self.class.new input: build_new_result(results), success: false
end
private
def build_new_result(input)
input || results.dup
end
end
end