# File lib/seamless_database_pool.rb, line 93
    def read_only_connection(pool_connection)
      return pool_connection.master_connection if pool_connection.using_master_connection?
      connection_type = Thread.current[:read_only_connection]
    
      if connection_type.kind_of?(Hash)
        connection = connection_type[pool_connection]
        unless connection
          connection = pool_connection.random_read_connection
          connection_type[pool_connection] = connection
        end
        return connection
      elsif connection_type == :random
        return pool_connection.random_read_connection
      else
        return pool_connection.master_connection
      end
    end