I have a server that needs to stream data to multiple clients as quickly as possible in the Observer pattern.
At least 200 messages need to be sent to each client per second until the client disconnects from the sever, and each message consists of 8 values of several primitive types. Because each message needs to be sent as soon as it is created, messages cannot be combined into one large message. Both the server and the clients reside on the same LAN.
Which technology is more suitable to implement streaming under this situation, RMI or socket?
The overhead of RMI is significant so it would not be suitable. It would be better to create a simple protocol and use sockets to send the data.
Depending on the latency that is acceptable you should configure socket buffer sizes and turn off Nagle algorithm.