    # File lib/active_record/connection_adapters/abstract/connection_specification.rb, line 91
          def clear_reloadable_connections!
            if @@allow_concurrency
              # With concurrent connections @@active_connections is
              # a hash keyed by thread id.
              @@active_connections.each do |thread_id, conns|
                conns.each do |name, conn|
                  if conn.requires_reloading?
                    conn.disconnect!
                    @@active_connections[thread_id].delete(name)
                  end
                end
              end
            else
              @@active_connections.each do |name, conn|
                if conn.requires_reloading?
                  conn.disconnect!
                  @@active_connections.delete(name)
                end
              end
            end
          end