Add deprecated log

Signed-off-by: Yuta Iwama <[email protected]>

Author: ganmacs

lib/fluent/msgpack_factory.rb

@@ -23,14 +23,23 @@ module MessagePackFactory
 
     module Mixin
       def msgpack_factory
+        if $log
+          $log.warn('Deprecated method: this method is going to be deleted. Use Fluent::MessagePackFactory.engine_factory')
+        end
         MessagePackFactory.engine_factory
       end
 
       def msgpack_packer(*args)
+        if $log
+          $log.warn('Deprecated method: this method is going to be deleted. Use Fluent::MessagePackFactory.msgpack_packer')
+        end
         MessagePackFactory.msgpack_packer(*args)
       end
 
       def msgpack_unpacker(*args)
+        if $log
+          $log.warn('Deprecated method: this method is going to be deleted. Use Fluent::MessagePackFactory.msgpack_unpacker')
+        end
         MessagePackFactory.msgpack_unpacker(*args)
       end
     end