1  // Purpose.  Server base class
 2  // Source.   Scott Oaks, Java Report, Oct 98, pp86-88
   
 3  import java.io.*;
 4  import java.net.*;
   
 5  class ServerBaseClass implements Runnable, Cloneable {
 6     private Thread       runner     = null;
 7     private ServerSocket server     = null;
 8     private Socket       data       = null;
 9     private boolean      shouldStop = false;
   
10     public synchronized void startServer( int port ) {
11        System.out.println("startServer: entry");
12        if (runner == null) {
13           try {
14              server = new ServerSocket( port );
15           } catch( Exception e ) { e.printStackTrace(); }
16           runner = new Thread( this );
17           System.out.println( "startServer: before runner.start()" );
18           runner.start();
19     }  }
20     public synchronized void stopServer() {
21        if (server != null) {
22           shouldStop = true;
23           runner.interrupt();
24           runner = null;
25           try { server.close(); } catch( Exception e ) { e.printStackTrace(); }
26           server = null;
27     }  }
28     public void run() {
29        System.out.println( "ServerBaseClass.run(): entry" );
30        if (server != null)
31           while ( ! shouldStop)
32              try {
33                 Socket          dataSocket = server.accept();
34                 ServerBaseClass newSocket  = (ServerBaseClass) clone();
35                 newSocket.server = null;
36                 newSocket.data   = dataSocket;
37                 newSocket.runner = new Thread( newSocket );
38                 System.out.println( "   before newSocket.runner.start()" );
39                 newSocket.runner.start();
40              } catch( Exception e ) { e.printStackTrace(); }
41        else
42           run( data );
43     }
44     public void run( Socket data ) {
45     }
46  }