This subsection discusses the items to be evaluated when you use custom adaptors.

• Number of adaptors to be created
  You must create as many adaptors as there are data input sources and output destinations. For details about the numbers of adaptors that can be created, see 2.2.2(3) Number of components that can be placed in a stream data processing system. You determine the number of adaptors to be created on the basis of the performance of the server on which Stream Data Platform - AF is run and performance in the stream data processing system.
  
• Processing to be performed by the adaptors
  You must evaluate the processing to be performed by the adaptors, such as how to input and output stream data. Based on that evaluation, you should further evaluate how those functions are to be implemented by using Java APIs provided by Stream Data Platform - AF.
  
• Mode of connection between adaptors and SDP server
  You must evaluate whether the in-process connection mode or the RMI connection mode is to be used to connect adaptors and the SDP server. For details about the connection modes, see 2.2.4 Configuration when custom adaptors are used.