Merge pull request #2346 from yahonda/diag48773

Make ActiveRecord's quoted name caches thread-safe on JRuby/TruffleRuby

Author: yahonda

lib/active_record/connection_adapters/oracle_enhanced/quoting.rb

@@ -7,10 +7,12 @@ module Quoting
         # QUOTING ==================================================
         #
         # see: abstract/quoting.rb
+        QUOTED_COLUMN_NAMES = Concurrent::Map.new # :nodoc:
+        QUOTED_TABLE_NAMES = Concurrent::Map.new # :nodoc:
 
         def quote_column_name(name) # :nodoc:
           name = name.to_s
-          self.class.quoted_column_names[name] ||= if /\A[a-z][a-z_0-9$#]*\Z/.match?(name)
+          QUOTED_COLUMN_NAMES[name] ||= if /\A[a-z][a-z_0-9$#]*\Z/.match?(name)
             "\"#{name.upcase}\""
           else
             # remove double quotes which cannot be used inside quoted identifier
@@ -67,7 +69,7 @@ def self.mixed_case?(name)
 
         def quote_table_name(name) # :nodoc:
           name, _link = name.to_s.split("@")
-          self.class.quoted_table_names[name] ||= [name.split(".").map { |n| quote_column_name(n) }].join(".")
+          QUOTED_TABLE_NAMES[name] ||= [name.split(".").map { |n| quote_column_name(n) }].join(".")
         end
 
         def quote_string(s) # :nodoc: