Class Signature

lib/evil_events/core/events.rb

@@ -18,6 +18,9 @@ module Events
     require_relative 'events/event_extensions/metadata_extendable'
     require_relative 'events/event_extensions/metadata_extendable/abstract_metadata'
     require_relative 'events/event_extensions/emittable'
+    require_relative 'events/event_extensions/class_signature'
+    require_relative 'events/event_extensions/class_signature/signature'
+    require_relative 'events/event_extensions/class_signature/equalizer'
     require_relative 'events/abstract_event'
     require_relative 'events/manager'
     require_relative 'events/manager/notifier'

lib/evil_events/core/events/abstract_event.rb

@@ -21,6 +21,8 @@ class AbstractEvent
     include EventExtensions::Emittable
     # @since 0.1.0
     include EventExtensions::MetadataExtendable
+    # @sicne 0.2.0
+    include EventExtensions::ClassSignature
     # @since 0.1.0
     extend EvilEvents::Shared::CombinedContext::Mixin
 

lib/evil_events/core/events/event_extensions/class_signature.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module EvilEvents::Core::Events::EventExtensions
+  module ClassSignature
+    class << self
+      def included(base_class)
+        base_class.extend(ClassMethods)
+      end
+    end
+
+    module ClassMethods
+      def signature
+        Signature.new(self)
+      end
+    end
+  end
+end

lib/evil_events/core/events/event_extensions/class_signature/equalizer.rb

@@ -0,0 +1,80 @@
+# frozen_string_literal: true
+
+module EvilEvents::Core::Events::EventExtensions::ClassSignature
+  # @api private
+  # @since 0.2.0
+  class Equalizer
+    # @rreturn [Signature]
+    #
+    # @since 0.2.0
+    attr_reader :signature_a
+    # @rreturn [Signature]
+    #
+    # @since 0.2.0
+    attr_reader :signature_b
+
+    # @param signature_a [Signature]
+    # @param signature_b [Signature]
+    #
+    # @since 0.2.0
+    def initialize(signature_a, signature_b)
+      @signature_a = signature_a
+      @signature_b = signature_b
+    end
+
+    # @return [Boolean]
+    #
+    # @since 0.2.0
+    def equal_payload?
+      signature_a.payload_stamp == signature_b.payload_stamp
+    end
+
+    # @return [Boolean]
+    #
+    # @since 0.2.0
+    def equal_metadata?
+      signature_a.metadata_stamp == signature_b.metadata_stamp
+    end
+
+    # @return [Boolean]
+    #
+    # @since 0.2.0
+    def equal_delegator?
+      signature_a.delegator_stamp == signature_b.delegator_stamp
+    end
+
+    # @return [Boolean]
+    #
+    # @since 0.2.0
+    def equal_adapter?
+      signature_a.adapter_stamp == signature_b.adapter_stamp
+    end
+
+    # @return [Boolean]
+    #
+    # @since 0.2.0
+    def equal_type_alias?
+      signature_a.type_alias_stamp == signature_b.type_alias_stamp
+    end
+
+    # @return [Boolean]
+    #
+    # @since 0.2.0
+    def equal_class?
+      signature_a.class_stamp == signature_b.class_stamp
+    end
+
+    # @option strict [Boolean]
+    # @return [Boolean]
+    #
+    # @since 0.2.0
+    def similar_signatures?(strict: false)
+      equal_payload?   &&
+      equal_metadata?  &&
+      equal_delegator? &&
+      equal_adapter?   &&
+      (strict ? (equal_class? && equal_type_alias?)
+              : (equal_class? || equal_type_alias?))
+    end
+  end
+end

lib/evil_events/core/events/event_extensions/class_signature/signature.rb

@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+module EvilEvents::Core::Events::EventExtensions::ClassSignature
+  # @api private
+  # @since 0.2.0
+  class Signature
+    # @return [EvilEvents::Core::Events::AbstractEvent]
+    attr_reader :event_class
+
+    # @param event_calass [EvilEvents::Core::Events::AbstractEvent]
+    #
+    # @since 0.2.0
+    def initialize(event_class)
+      @event_class = event_class
+    end
+
+    # @return [Hash]
+    #
+    # @since 0.2.0
+    def payload_stamp
+      event_class::Payload.schema
+    end
+
+    # @return [Hash]
+    #
+    # @since 0.2.0
+    def metadata_stamp
+      event_class::Metadata.schema
+    end
+
+    # @return [String]
+    #
+    # @since 0.2.0
+    def class_stamp
+      event_class.name
+    end
+
+    # @return [String]
+    #
+    # @since 0.2.0
+    def type_alias_stamp
+      event_class.type
+    end
+
+    # @return [Symbol,String]
+    #
+    # @since 0.2.0
+    def delegator_stamp
+      event_class.default_delegator
+    end
+
+    # @return [Hash]
+    #
+    # @since 0.2.0
+    def adapter_stamp
+      { event_class.adapter_name => event_class.adapter }
+    end
+
+    # @return [Boolean]
+    #
+    # @since 0.2.0
+    def ==(signature)
+      Equalizer.new(self, signature).similar_signatures?
+    end
+    alias_method :eql?, :==
+  end
+end