TCP socket programing and multithreading in java

Question

I want to send and receive data between three computers using a TCP socket in Java

The first computer takes the data from the keyboard and sends it to the second computer.
The second computer takes the data from the first and sends it to the third computer.

My question is: Can I implement the TCP socket program in the second computer (which receives data from the first computer and sends it to the third at the same time) without using multithreading?

the default/simplest socket support in java is using the "blocking" IO APIs, which require multiple threads to use correctly. The "non-blocking" APIs can be done single threaded, but are _much more complex_ to use. — jtahlborn, Dec 14 '15 at 16:38

score 1 · Answer 1 · answered Dec 14 '15 at 16:36

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Yes you can. (but it's probably stupid)

Just bind a port and listen on it on server 2. Server 1 connects to server 2 and sends data. Server 2 reads data, connects to server 3 and sends him data, on same thread.

Without multithreading, you can either read input from server 1 either send data to server 3. Moreover, you can handle data from server 1 only one by one. The program will work slowly (no faster as it can be with multithreading).

answered Dec 14 '15 at 16:36

Prim

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since data are taken from a keyboard, the speed of your single-threaded solution should be sufficient. – Alexei Kaigorodov Dec 14 '15 at 18:39

score 0 · Answer 2 · edited May 23 '17 at 12:23

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You should make machine 2 as server which will listen on some fixed ip:port. Make machine 1 and 3 as client which will connect to machine 2 on fixed ip:port.

Regarding multithreading, you can make your server thread less by using poll/select. Please refer to link Is there epoll equivalent in Java? which explains poll/select better.

edited May 23 '17 at 12:23

Community

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answered Dec 14 '15 at 16:39

Ritesh

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TCP socket programing and multithreading in java

2 Answers2