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[Java] Multi-Socket Question

Started by Chryzmo Apr 5, 2008 at 4:26 PM 3 replies 1.7k views

Original Post

Apr 5, 2008 at 4:26 PM

Hey all, I am looking at writing a multi-socket server in Java and I've been looking how to go about designing it. From what I've read it seems that Java doesn't have a select() type function like the C socket library. This would seem, to me, to mean that to get the same functionality from a Java application you would need to create a new thread for each socket that connects and then write a Manager class to check when each socket has data that is ready to be utilized. I was hoping someone could help me out as to whether I'm on the right track with this. Thanks, Chryzmo

eedok

192

eedok

Apr 5, 2008 at 4:32 PM

isn't there a select like function in the nio package?

Antheus

216

Antheus

Apr 5, 2008 at 4:53 PM

Quote:
Original post by Chryzmo

I am looking at writing a multi-socket server in Java and I've been looking how to go about designing it. From what I've read it seems that Java doesn't have a select() type function like the C socket library.

No it doesn't. Sockets are blocking.

Quote:
This would seem, to me, to mean that to get the same functionality from a Java application you would need to create a new thread for each socket that connects and then write a Manager class to check when each socket has data that is ready to be utilized.

When you accept a new socket, you spawn a thread, and then do a blocking read in an infinite loop for that particular socket.

Quote:
I was hoping someone could help me out as to whether I'm on the right track with this.

If you intend to support a dozen or so clients, then it'll work.

For any reasonable socket server however, you'll need to look into NIO, which allows for select-like approach.

Kaze

135

Kaze

Apr 5, 2008 at 5:10 PM

I just had thread A have a blocking ServerSocket that listens for connections and then dumps the created sockets into a queue and thread B (or thread pool B) writes and reads from them without blocking by only reading available bytes, this setup wasn't under a ton of load but worked fine for me.

Aldacron

208

Aldacron

Apr 8, 2008 at 5:45 AM

Quote:
Original post by Chryzmo
I am looking at writing a multi-socket server in Java and I've been looking how to go about designing it. From what I've read it seems that Java doesn't have a select() type function like the C socket library.

Java has had select() functionality, and non-blocking sockets, since 1.4 in the java.nio package. Google Java NIO for tutorials, articles, books and such.

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