//file: Server.java
import java.net.*;
import java.io.*;

public class Server {
  public static void main( String argv[] ) throws IOException {
    ServerSocket ss = new ServerSocket( Integer.parseInt(argv[0]) );
    while ( true )
      new ServerConnection( ss.accept() ).start(  );
  }
} // end of class Server

class ServerConnection extends Thread {
  Socket client;
  ServerConnection ( Socket client ) throws SocketException {
    this.client = client;
    setPriority( NORM_PRIORITY - 1 );
  }

  public void run(  ) {
    try {
      ObjectInputStream in =
        new ObjectInputStream( client.getInputStream(  ) );
      ObjectOutputStream out =
        new ObjectOutputStream( client.getOutputStream(  ) );
      while ( true ) {
        out.writeObject( processRequest( in.readObject(  ) ) );
        out.flush(  );
      }
    } catch ( EOFException e3 ) { // Normal EOF
      try {
        client.close(  );
      } catch ( IOException e ) { }
    } catch ( IOException e ) {
      System.out.println( "I/O error " + e ); // I/O error
    } catch ( ClassNotFoundException e2 ) {
      System.out.println( e2 ); // unknown type of request object
    }
  }

  private Object processRequest( Object request ) {
    if ( request instanceof DateRequest )
      return new java.util.Date(  );
    else if ( request instanceof WorkRequest )
      return ((WorkRequest)request).execute(  );
    else
      return null;
  }
}