What does 'end of stream' mean when working with sockets

Question

When working with Sockets in Java, how can you tell whether the client has finished sending all (binary) data, before you could start processing them. Consider for example:

Answer 1

as Nikita said this is more of task of protocol. Either you can go by header and body approach or you can send a special character or symbol for end of stream to break processing loop. Something like if you send say '[[END]]' on socket to denote end of stream.