Add NotificationMixin for emitting generic task status notifications

app/models/mixins/notification_mixin.rb

@@ -0,0 +1,26 @@
+module NotificationMixin
+  extend ActiveSupport::Concern
+
+  def notify_task_start(subject, message)
+    notify_task_emit(:generic_task_start, subject, message)
+  end
+
+  def notify_task_finish(subject, message)
+    notify_task_emit(:generic_task_finish, subject, message)
+  end
+
+  def notify_task_fail(subject, message)
+    notify_task_emit(:generic_task_fail, subject, message)
+  end
+
+  def notify_task_update(subject, message)
+    notify_task_emit(:generic_task_update, subject, message)
+  end
+
+  private
+
+  def notify_task_emit(type, subject, message)
+    subject = self if subject.nil? # Fall back to the model as subject if nil
+    Notification.create(type, :subject => subject, :options => {:message => message})
+  end
+end