Source Code Cross Referenced for DemoServer.java in  » Byte-Code » Javassist » sample » evolve » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Byte Code » Javassist » sample.evolve 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package sample.evolve;
02:
03:        import javassist.tools.web.*;
04:        import java.io.*;
05:
06:        /**
07:         * A web server for demonstrating class evolution.  It must be
08:         * run with a DemoLoader.
09:         *
10:         * If a html file /java.html is requested, this web server calls
11:         * WebPage.show() for constructing the contents of that html file
12:         * So if a DemoLoader changes the definition of WebPage, then
13:         * the image of /java.html is also changed.
14:         * Note that WebPage is not an applet.  It is rather
15:         * similar to a CGI script or a servlet.  The web server never
16:         * sends the class file of WebPage to web browsers.
17:         *
18:         * Furthermore, if a html file /update.html is requested, this web
19:         * server overwrites WebPage.class (class file) and calls update()
20:         * in VersionManager so that WebPage.class is loaded into the JVM
21:         * again.  The new contents of WebPage.class are copied from
22:         * either sample/evolve/WebPage.class
23:         * or sample/evolve/sample/evolve/WebPage.class.
24:         */
25:        public class DemoServer extends Webserver {
26:
27:            public static void main(String[] args) throws IOException {
28:                if (args.length == 1) {
29:                    DemoServer web = new DemoServer(Integer.parseInt(args[0]));
30:                    web.run();
31:                } else
32:                    System.err
33:                            .println("Usage: java sample.evolve.DemoServer <port number>");
34:            }
35:
36:            public DemoServer(int port) throws IOException {
37:                super (port);
38:                htmlfileBase = "sample/evolve/";
39:            }
40:
41:            private static final String ver0 = "sample/evolve/WebPage.class.0";
42:            private static final String ver1 = "sample/evolve/WebPage.class.1";
43:            private String currentVersion = ver0;
44:
45:            public void doReply(InputStream in, OutputStream out, String cmd)
46:                    throws IOException, BadHttpRequest {
47:                if (cmd.startsWith("GET /java.html ")) {
48:                    runJava(out);
49:                    return;
50:                } else if (cmd.startsWith("GET /update.html ")) {
51:                    try {
52:                        if (currentVersion == ver0)
53:                            currentVersion = ver1;
54:                        else
55:                            currentVersion = ver0;
56:
57:                        updateClassfile(currentVersion);
58:                        VersionManager.update("sample.evolve.WebPage");
59:                    } catch (CannotUpdateException e) {
60:                        logging(e.toString());
61:                    } catch (FileNotFoundException e) {
62:                        logging(e.toString());
63:                    }
64:                }
65:
66:                super .doReply(in, out, cmd);
67:            }
68:
69:            private void runJava(OutputStream outs) throws IOException {
70:                OutputStreamWriter out = new OutputStreamWriter(outs);
71:                out.write("HTTP/1.0 200 OK\r\n\r\n");
72:                WebPage page = new WebPage();
73:                page.show(out);
74:                out.close();
75:            }
76:
77:            /* updateClassfile() copies the specified file to WebPage.class.
78:             */
79:            private void updateClassfile(String filename) throws IOException,
80:                    FileNotFoundException {
81:                byte[] buf = new byte[1024];
82:
83:                FileInputStream fin = new FileInputStream(filename);
84:                FileOutputStream fout = new FileOutputStream(
85:                        "sample/evolve/WebPage.class");
86:                for (;;) {
87:                    int len = fin.read(buf);
88:                    if (len >= 0)
89:                        fout.write(buf, 0, len);
90:                    else
91:                        break;
92:                }
93:            }
94:        }
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