01: package sample.evolve;
02:
03: import javassist.*;
04:
05: /**
06: * DemoLoader is a class loader for running a program including
07: * an updatable class. This simple loader allows only a single
08: * class to be updatable. (Extending it for supporting multiple
09: * 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: */
21: public 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: }
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