src/org/ibex/xt/Prevalence.java

   1 package org.ibex.xt;
   2 import org.ibex.js.*;
   3 import org.ibex.util.*;
   4 import org.ibex.io.*;
   5 import java.io.*;
   6 import java.net.*;
   7 import java.util.*;
   8 import javax.servlet.*;
   9 import javax.servlet.http.*;
  10 import com.thoughtworks.xstream.*;
  11 import org.prevayler.*;
  12 import org.prevayler.implementation.snapshot.*;
  13
  14 public class Prevalence {
  15
  16     static final Hashtable prevaylers = new Hashtable();
  17
  18     public static void destroy(ServletContext cx, Prevayler prevayler) { try {
  19         prevaylers.remove(cx);
  20         prevayler.takeSnapshot();
  21         prevayler.close();
  22     } catch (Exception e) { e.printStackTrace(); } }
  23
  24     private static class SnapshotThread extends Thread {
  25         ServletContext cx;
  26         public SnapshotThread(ServletContext cx) { this.cx = cx; }
  27         public void run() {
  28             try {
  29                 Thread.sleep(10000);
  30                 Prevayler privatePrevayler = (Prevayler)prevaylers.get(cx);
  31                 if (privatePrevayler == null) return;
  32                 privatePrevayler.takeSnapshot();
  33             } catch (Exception e) {
  34                 e.printStackTrace();
  35             }
  36         }
  37     }
  38
  39     public static Prevayler getPrevayler(ServletContext cx) {
  40         try {
  41             Prevayler prevayler;
  42             synchronized(cx) {
  43                 prevayler = (Prevayler)prevaylers.get(cx);
  44                 if (prevayler == null) {
  45                     PrevaylerFactory pf = new PrevaylerFactory();
  46                     String base = cx.getRealPath("/") + "WEB-INF" + File.separatorChar + "prevalent";
  47                     System.err.println("prevayling to " + base);
  48                     pf.configurePrevalenceBase(base);
  49                     XStreamSnapshotManager manager = new XStreamSnapshotManager(new JS(), base, null) {
  50                             protected XStream createXStream() {
  51                                 XStream xstream = new XStream();
  52                                 xstream.alias("js", JS.class);
  53                                 xstream.alias("jsdate", JSDate.class);
  54                                 return xstream;
  55                             }
  56                         };
  57                     System.err.println("configuring with " + manager);
  58                     pf.configureSnapshotManager(manager);
  59                     //pf.configureClassLoader(JSTransaction.class.getClassLoader());
  60                     prevayler = pf.create();
  61                     prevaylers.put(cx, prevayler);
  62                     new SnapshotThread(cx).start();
  63                 }
  64             }
  65             return prevayler;
  66         } catch (Exception e) { throw new RuntimeException(e); } }
  67
  68     public static class JSTransaction implements Transaction {
  69         public static final long serialVersionUid = 0xfb2aa281;
  70         private JS js;
  71         public JSTransaction(JS js) { this.js = js; }
  72         public void executeOn(Object o, Date now) {
  73             try {
  74                 js.call(o, new JSDate(now.getTime()), null, null, 2);
  75             } catch (Exception e) { throw new RuntimeException(e); }
  76         }
  77     }
  78
  79     public static class JSQuery implements Query {
  80         public static final long serialVersionUid = 0xfb2aa282;
  81         private JS js;
  82         public JSQuery(JS js) { this.js = js; }
  83         public Object query(Object o, Date now) {
  84             try {
  85                 return js.call(o, new JSDate(now.getTime()), null, null, 2);
  86             } catch (Exception e) { throw new RuntimeException(e); }
  87         }
  88     }
  89 }