Nonblocking I/O - Java Network Programming - page 357

key . channel (). close ();
} catch ( IOException cex ) {
// ignore
}
}
Example 11-2 puts this all together in a complete chargen server that processes multiple
connections efficiently in a single thread.
Example 11-2. A nonblocking chargen server
import java.nio.* ;
import java.nio.channels.* ;
import java.net.* ;
import java.util.* ;
import java.io.IOException ;
public class ChargenServer {
public static int DEFAULT_PORT = 19 ;
public static void main ( String [] args ) {
int port ;
try {
port = Integer . parseInt ( args [ 0 ]);
} catch ( RuntimeException ex ) {
port = DEFAULT_PORT ;
}
System . out . println ( "Listening for connections on port " + port );
byte [] rotation = new byte [ 95 * 2 ];
for ( byte i = ' ' ; i <= '~' ; i ++) {
rotation [ i - ' ' ] = i ;
rotation [ i + 95 - ' ' ] = i ;
}
ServerSocketChannel serverChannel ;
Selector selector ;
try {
serverChannel = ServerSocketChannel . open ();
ServerSocket ss = serverChannel . socket ();
InetSocketAddress address = new InetSocketAddress ( port );
ss . bind ( address );
serverChannel . configureBlocking ( false );
selector = Selector . open ();
serverChannel . register ( selector , SelectionKey . OP_ACCEPT );
} catch ( IOException ex ) {
ex . printStackTrace ();
return ;
}
while ( true ) {