Define status codes in a shared module

lib/droonga/message_processing_error.rb

@@ -14,10 +14,11 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 require "droonga/error"
+require "droonga/status_code"
 
 module Droonga
   class MessageProcessingError < Error
-    STATUS_CODE = 500
+    STATUS_CODE = STATUS_INTERNAL_ERROR
 
     attr_reader :message, :detail
 
@@ -45,10 +46,10 @@ def response_body
   end
 
   class BadRequest < MessageProcessingError
-    STATUS_CODE = 400
+    STATUS_CODE = STATUS_BAD_REQUEST
   end
 
   class NotFound < MessageProcessingError
-    STATUS_CODE = 404
+    STATUS_CODE = STATUS_NOT_FOUND_REQUEST
   end
 end

lib/droonga/output_message.rb

@@ -13,6 +13,8 @@
 # License along with this library; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
+require "droonga/status_code"
+
 module Droonga
   class OutputMessage
     def initialize(raw_message)

lib/droonga/replier.rb

@@ -13,10 +13,10 @@
 # License along with this library; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
+require "droonga/status_code"
+
 module Droonga
   class Replier
-    STATUS_OK = 200
-
     def initialize(forwarder)
       @forwarder = forwarder
     end

lib/droonga/status_code.rb

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2014 Droonga Project
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License version 2.1 as published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+module Droonga
+  STATUS_OK             = 200
+  STATUS_BAD_REQUEST    = 400
+  STATUS_NOT_FOUND      = 404
+  STATUS_INTERNAL_ERROR = 500
+end