u-case + u-observers

sample.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'u-case'
  gem 'u-observers'
end

class Person
  include Micro::Observers

  attr_reader :name

  def initialize(name)
    @name = name
  end

  def name=(new_name)
    return unless observers.subject_changed(new_name != @name)

    @name = new_name

    observers.notify(:name_has_been_changed)
  end
end

class PrintPersonName < Micro::Case
  attributes :person, :number

  def call!
    puts("Person name: #{person.name}, number: #{number}")

    Success()
  end
end

person = Person.new('Rodrigo')

person.observers.on(
  event: :name_has_been_changed,
  call: PrintPersonName,
  with: -> event { {person: event.subject, number: rand} }
)

person.name = 'Serradura'

sample2.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'u-case'
  gem 'u-observers'
end

class Person
  include Micro::Attributes.with(:initialize)
  include Micro::Observers

  attribute :name

  def name=(new_name)
    return unless observers.subject_changed(new_name != @name)

    @name = new_name

    observers.notify(:name_has_been_changed)
  end
end

class PrintPersonName < Micro::Case
  attributes :person, :number

  def call!
    puts("Person name: #{person.name}, number: #{number}")

    Success()
  end
end

person = Person.new(name: 'Rodrigo')

person.observers.on(
  event: :name_has_been_changed,
  call: PrintPersonName,
  with: -> event { {person: event.subject, number: rand} }
)

person.name = 'Serradura'