Create Configuration class

lib/ddtrace.rb

@@ -2,6 +2,7 @@
 require 'ddtrace/pin'
 require 'ddtrace/tracer'
 require 'ddtrace/error'
+require 'ddtrace/configuration'
 
 # \Datadog global namespace that includes all tracing functionality for Tracer and Span classes.
 module Datadog
@@ -29,6 +30,18 @@ def self.tracer
   def self.registry
     @registry
   end
+
+  class << self
+    attr_writer :configuration
+
+    def configuration
+      @configuration ||= Configuration.new
+    end
+
+    def configure
+      configuration.configure
+    end
+  end
 end
 
 require 'ddtrace/monkey'

lib/ddtrace/configuration.rb

@@ -0,0 +1,30 @@
+module Datadog
+  # Configuration provides a unique access point for configurations
+  class Configuration
+    def initialize(options = {})
+      @registry = options.fetch(:registry, Datadog.registry)
+    end
+
+    def configure
+      yield(self)
+    end
+
+    def get(contrib, param)
+      registry[contrib].get_option(param)
+    end
+
+    def use(integration_name, options = {})
+      integration = registry[integration_name]
+
+      options.each_with_object(integration) do |(name, value), klass|
+        klass.set_option(name, value)
+      end
+
+      integration.patch if integration.respond_to?(:patch)
+    end
+
+    private
+
+    attr_reader :registry
+  end
+end

test/configuration_test.rb

@@ -0,0 +1,51 @@
+require 'ddtrace/configuration'
+require 'ddtrace/configurable'
+
+module Datadog
+  class ConfigurationTest < Minitest::Test
+    def setup
+      @registry = Registry.new
+      @configuration = Configuration.new(registry: @registry)
+    end
+
+    def test_use_method
+      contrib = Minitest::Mock.new
+      contrib.expect(:patch, true)
+
+      @registry.add(:example, contrib)
+      @configuration.use(:example)
+
+      assert_mock(contrib)
+    end
+
+    def test_module_configuration
+      integration = Module.new do
+        include Contrib::Base
+        option :option1
+        option :option2
+      end
+
+      @registry.add(:example, integration)
+
+      @configuration.configure do |c|
+        c.use :example, option1: :foo!, option2: :bar!
+      end
+
+      assert_equal(:foo!, integration.get_option(:option1))
+      assert_equal(:bar!, integration.get_option(:option2))
+    end
+
+    def test_get
+      integration = Module.new do
+        include Contrib::Base
+        option :option1, default: :value1
+        option :option2, default: :value2
+      end
+
+      @registry.add(:example, integration)
+
+      assert_equal(:value1, @configuration.get(:example, :option1))
+      assert_equal(:value2, @configuration.get(:example, :option2))
+    end
+  end
+end