EBA Cheatsheet

eba.rb

# Responsibilites:
# - specific, focused task
# - presenting data to the user
class Worker1
end

class Worker2
end

class Builder
  attr_reader :binder, :worker_1, :worker_2
  
  def build
    @binder = Binder.new(self)
    @worker_1 = Worker1.new
    @worker_2 = Worker2.new  
  end
end

class Binder
  def initialize
    @builder = builder
  end

  def bind(context)
    @builder.worker_1.notification += @builder.worker_2.handler
    @builder.worker_2.notification += context.handler
  end
end

# Responsibilities:
# - coordinate the actions of one or more workers
# - retrieve data for workers
class Coordinator
  def call(params, context = NullContext.new)
    builder = Builder.build
    builder.binder.bind(context)

    builder.worker_1.call(params)
  end
end