1 files changed, 31 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/logger_thread_safe_level.rb b/activesupport/lib/active_support/logger_thread_safe_level.rb
new file mode 100644
index 0000000000..0aad93e7f2
--- /dev/null
+++ b/activesupport/lib/active_support/logger_thread_safe_level.rb
@@ -0,0 +1,31 @@
+require 'active_support/concern'
+
+module ActiveSupport
+  module LoggerThreadSafeLevel
+    extend ActiveSupport::Concern
+
+    def after_initialize
+      @local_levels = Concurrent::Map.new(:initial_capacity => 2)
+    end
+
+    def local_log_id
+      Thread.current.__id__
+    end
+
+    def local_level
+      @local_levels[local_log_id]
+    end
+
+    def local_level=(level)
+      if level
+        @local_levels[local_log_id] = level
+      else
+        @local_levels.delete(local_log_id)
+      end
+    end
+
+    def level
+      local_level || super
+    end
+  end
+end