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monadic_tracktor
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| require 'rubygems' | |
| require 'deterministic' | |
| include Deterministic::Prelude::Result | |
| Operator = Class.new | |
| Visitor = Class.new | |
| fetch_operator = Proc.new {|request| | |
| Operator.new | |
| } | |
| fetch_visitor = Proc.new {|request| | |
| Success(Visitor.new) | |
| # Failure("No such visitor") | |
| } | |
| start_engagement = Proc.new {|request| | |
| puts "Starting engagement" | |
| Success(request) | |
| # Failure("bad engagement") | |
| } | |
| render_response = Proc.new {|request| | |
| operator = request.fetch(:operator) | |
| visitor = request.fetch(:visitor) | |
| {message: "#{operator.class.name} ##{operator.object_id} started engagement with #{visitor.class.name} ##{visitor.object_id}"} | |
| } | |
| store_operator = Proc.new {|request| | |
| puts "Storing operator" | |
| } | |
| notify_participants = Proc.new {|request| | |
| puts "Notifying participants" | |
| } | |
| def Merge(key, fn) | |
| Proc.new {|request| | |
| fn.call(request) | |
| .map {|result| Success(request.merge(key => result)) } | |
| } | |
| end | |
| def OnSuccess(block) | |
| Proc.new {|request| | |
| block.call(request) | |
| Success(request) | |
| } | |
| end | |
| def Pure(block) | |
| Proc.new {|request| | |
| Success(block.call(request)) | |
| } | |
| end | |
| def Chain(*steps) | |
| Proc.new {|request| | |
| steps.reduce(Success(request)) {|acc, step| acc >> step } | |
| } | |
| end | |
| start_engagement = Chain( | |
| Merge(:operator, Pure(fetch_operator)), | |
| Merge(:visitor, fetch_visitor), | |
| start_engagement, | |
| OnSuccess(notify_participants), | |
| OnSuccess(store_operator), | |
| Pure(render_response) | |
| ) | |
| tracktor = Proc.new { | |
| # Very similar to current substation solution | |
| request = {operator_id: 5, visitor_id: 6} | |
| response = start_engagement.call(request) | |
| puts response.inspect | |
| } | |
| tracktor.call |
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