As mentioned in 2.2.2(2) Connection mode between adaptors and SDP server, the modes of connection between adaptors and the SDP server are the in-process connection and the RMI connection. If you use custom adaptors, you can intermix adaptors that operate in the two connection modes. You would determine the placement of the SDP server and the adaptors, taking into account the size and purpose of your stream data processing system. For details about system configurations depending on the connection mode, see the manual uCosminexus Stream Data Platform - Application Framework Application Development Guide.