How to restart a serverSocket in java

Question

I am trying to add a restart server function that ejects all players and threads, then starts a new server socket for new players. This is how I have tried it, but when I restart, then try to add more players they don't connect?

Any help would be awesome, thanks. Alternatively, is there a way to eject all connections from server without closing socket?

private volatile ServerSocket ss;

private Socket p1;
private Socket p2;

private GameSession ses;

private ObjectOutputStream top1;
private ObjectOutputStream top2;

 public void connectToClient() {
    try {
        ss = new ServerSocket(8000);

        while (true) {


            p1 = ss.accept();

            top1 = new ObjectOutputStream(p1.getOutputStream());

            p2 = ss.accept();

            top2 = new ObjectOutputStream(p2.getOutputStream());

            see = new GameSession(p1, p2, top1, top2);

            new Thread(see).start();

        }
    } catch (IOException ex) {
        System.err.println(ex);
    }
}

private void restartServer() {
    if (ss.isBound()) {
        try {
            ss.close();
            ss = new ServerSocket(8000);

            displayLog.append(new Date() + ": Server started at socket "
                    + ss.getLocalPort() + '\n');

        } catch (IOException ex) {
            System.err.println(ex);
        }
    }
}

What are you doing on the player end? I would consider sending a message saying that you're shutting down and restarting so the players can do something useful such as trying to connect again. — bblincoe, Dec 31 '13 at 15:34

score 1 · Answer 1 · answered Dec 31 '13 at 15:38

Your restartServer method does not contain any functionality to start a new game. All it does is create a new ServerSocket that doesn't do anything. Instead of instantiating a new ServerSocket, call connectToClientafter close.

private void restartServer() {
    if (ss.isBound()) {
        try {
            ss.close();
            connectToClient();

            displayLog.append(new Date() + ": Server started at socket "
                + ss.getLocalPort() + '\n');

        } catch (IOException ex) {
            System.err.println(ex);
        }
    }
}

This does not work, it just causes the server to hang? The connect to client is in a while loop, do i need to break that? — user3131312, Dec 31 '13 at 16:24

score 0 · Answer 2 · edited Dec 31 '13 at 16:03

0

Restarting a ServerSocket should work. I assume you are calling restartServer in a different Thread than connectToClient? Also ServerSocker should be volatile.

edited Dec 31 '13 at 16:03

Trying

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answered Dec 31 '13 at 15:55

SpiderPig

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I've changed it to volatile, it is using the same thread as ConnectToClient, I only introduce new threads during new game sessions. Still is not connecting new clients – user3131312 Dec 31 '13 at 16:22
Your loop is stopped by an IOException when you close the server socket. You have to restart it. Also why do you want to close the ss anyway? – SpiderPig Dec 31 '13 at 17:07

score 0 · Answer 3 · edited Dec 31 '13 at 16:16

0

Stop the thread (First hold the instance of thread) - On closure of the thread, close the client sockets first.
Close the ServerSocket
call connectToCLient

edited Dec 31 '13 at 16:16

gturri

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answered Dec 31 '13 at 15:56

theexamtime

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I've passéd the instances of threads and sockets, should I hold on to them? – user3131312 Dec 31 '13 at 16:29
Hold the thread reference - You just Google how to stop the thread. Before stopping the thread close the client socket(s). – theexamtime Dec 31 '13 at 17:19

user207421 · Accepted Answer · 2013-12-31T17:17:55.810

0

Closing the ServerSocket and creating a new one doesn't accomplish anything useful. The only effect of that would be to cause connection losses on pending, un-accepted connections. Remove that.

You have to close the accepted sockets, and have the clients react to that by attempting to reconnect.

edited Dec 31 '13 at 17:17

answered Dec 31 '13 at 16:37

user207421

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How to restart a serverSocket in java

4 Answers4