Module: Y::Redis::Config::Option

Included in:
Y::Redis::Config
Defined in:
lib/y/redis/config/option.rb

Overview

Y::Redis configuration option DSL

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extended(base) ⇒ Object

Raises:



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# File 'lib/y/redis/config/option.rb', line 77

def self.extended(base)
  return if base.respond_to?(:builder_class)

  raise Y::Redis::MissingConfigurationBuilderClass,
        "Define `self.builder_class` method " \
        "for #{base} that returns your custom Builder class to use " \
        "options DSL!"
end

Instance Method Details

#option(name, options = {}) ⇒ Object

Defines configuration option

When you call option, it defines two methods. One method will take place in the Config class and the other method will take place in the Builder class.

The name parameter will set both builder method and config attribute. If the :as option is defined, the builder method will be the specified option while the config attribute will be the name parameter.

If you want to introduce another level of config DSL you can define builder_class parameter. Builder should take a block as the initializer parameter and respond to function build that returns the value of the config attribute.

Options

  • :as

    Set the builder method that goes inside configure block

  • :default

    The default value in case no option was set

  • :builder_class

    Configuration option builder class

Examples

option :name
option :name, as: :set_name
option :name, default: 'My Name'
option :scopes builder_class: ScopesBuilder



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# File 'lib/y/redis/config/option.rb', line 36

def option(name, options = {}) # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/MethodLength, Metrics/PerceivedComplexity
  attribute = options[:as] || name
  attribute_builder = options[:builder_class]

  builder_class.instance_eval do
    if method_defined?(name)
      Kernel.warn "[Y::Redis] Option #{name} already defined and will be overridden"
      remove_method name
    end

    define_method name do |*args, &block| # rubocop:disable Metrics/MethodLength
      if (deprecation_opts = options[:deprecated])
        warning = "[Y::Redis] #{name} has been deprecated and will soon be removed"
        if deprecation_opts.is_a?(Hash)
          warning = "#{warning}\n#{deprecation_opts.fetch(:message)}"
        end

        Kernel.warn(warning)
      end

      value = if attribute_builder
                attribute_builder.new(&block).build
              else
                block || args.first
              end

      @config.instance_variable_set(:"@#{attribute}", value)
    end
  end

  define_method attribute do |*_args|
    if instance_variable_defined?(:"@#{attribute}")
      instance_variable_get(:"@#{attribute}")
    else
      options[:default]
    end
  end

  public attribute
end