1package sample.evolve;
2
3import javassist.*;
4
5/**
6 * DemoLoader is a class loader for running a program including
7 * an updatable class.  This simple loader allows only a single
8 * class to be updatable.  (Extending it for supporting multiple
9 * updatable classes is easy.)
10 *
11 * To run, type as follows:
12 *
13 * % java sample.evolve.DemoLoader <port number>
14 *
15 * Then DemoLoader launches sample.evolve.DemoServer with <port number>.
16 * It also translates sample.evolve.WebPage, which sample.evolve.DemoServer
17 * uses, so that it is an updable class.
18 *
19 * Note: JDK 1.2 or later only.
20 */
21public class DemoLoader {
22    private static final int initialVersion = 0;
23    private String updatableClassName = null;
24    private CtClass updatableClass = null;
25
26    /* Creates a <code>DemoLoader</code> for making class WebPage
27     * updatable.  Then it runs main() in sample.evolve.DemoServer.
28     */
29    public static void main(String[] args) throws Throwable {
30        Evolution translator = new Evolution();
31        ClassPool cp = ClassPool.getDefault();
32        Loader cl = new Loader();
33        cl.addTranslator(cp, translator);
34
35        translator.makeUpdatable("sample.evolve.WebPage");
36        cl.run("sample.evolve.DemoServer", args);
37    }
38}
39