Module: Ant::DRY::ResourceInjector

Included in:
Configuration::ServiceManager, Server::Nanoservice::Datasource::IDGenerators, Server::Nanoservice::Factory, Server::Response
Defined in:
lib/ant/dry/resource_injector.rb

Overview

Provides a method for sending external dependencies to classes, like database connections, configurations, and other objects that can vary but does not modify the class functionality. This class works a decorator to be just extended by classes

class Controller
  extend ResourceInjector
end

Instance Method Summary collapse

Instance Method Details

#register(key, subkey, value = nil) ⇒ Object

Provides the interface for sending objects inside the class. The resources have a group and sub group. When no group is given, it will be added to the :root group

Examples

Controller.inject(:magic_number, 42)
Controller.inject(:databases, :database_conection, Sequel.connect)



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# File 'lib/ant/dry/resource_injector.rb', line 30

def register(key, subkey, value = nil)
  if value.nil?
    value = subkey
    subkey = key
    key = :root
  end
  resources(key)[subkey] = value
end

#resource(key, subkey = nil) ⇒ Object

Provides the inside interface for fetching the objects that were previously provided from the external world. Also, when no subgroup is given, the key is fetched from :root

Examples

class Controller
  def initialize
    @magic_number = self.class.resource(:magic_number)
  end

  def self.factory(id)
    db = resource(:databases, :database_conection)
  end
end



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# File 'lib/ant/dry/resource_injector.rb', line 52

def resource(key, subkey = nil)
  if subkey.nil?
    subkey = key
    key = :root
  end
  res = resources(key)[subkey]
  raise("Resource `#{key}::#{subkey}` Not Found") if res.nil?
  res
end

#resources(key) ⇒ Object

Initialices the resources value and returns the object. This method should not be used from the out context. Resources are grouped by key



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# File 'lib/ant/dry/resource_injector.rb', line 18

def resources(key)
  @resources ||= {}
  @resources[key] ||= {}
  @resources[key]
end