KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > codehaus > aspectwerkz > transform > inlining > deployer > RedefinerFactory


1 /**************************************************************************************
2  * Copyright (c) Jonas BonŽr, Alexandre Vasseur. All rights reserved. *
3  * http://aspectwerkz.codehaus.org *
4  * ---------------------------------------------------------------------------------- *
5  * The software in this package is published under the terms of the LGPL license *
6  * a copy of which has been included with this distribution in the license.txt file. *
7  **************************************************************************************/
8 package org.codehaus.aspectwerkz.transform.inlining.deployer;
9
10 import org.codehaus.aspectwerkz.util.ContextClassLoader;
11 import org.codehaus.aspectwerkz.exception.WrappedRuntimeException;
12
13 /**
14  * Factory for the different redefiner implementations.
15  *
16  * @author <a HREF="mailto:jboner@codehaus.org">Jonas BonŽr </a>
17  */
18 public class RedefinerFactory {
19     private static final String JavaDoc HOTSWAP_REDEFINER_CLASS_NAME =
20             "org.codehaus.aspectwerkz.extension.hotswap.HotSwapRedefiner";
21
22     private static final String JavaDoc JVMTI_REDEFINER_CLASS_NAME =
23             "org.codehaus.aspectwerkz.hook.JVMTIRedefiner";
24
25     /**
26      * Creates a new redefiner instance.
27      * Try first with JDK 5 and failover on Java 1.4 HotSwap (requires native AW module)
28      *
29      *
30      * @return the redefiner instance
31      */
32     public static Redefiner newRedefiner(final Type type) {
33         if (type.equals(Type.HOTSWAP)) {
34             try {
35                 Class JavaDoc redefinerClass = ContextClassLoader.forName(JVMTI_REDEFINER_CLASS_NAME);
36                 return (Redefiner) redefinerClass.newInstance();
37             } catch (Throwable JavaDoc t) {
38                 try {
39                     Class JavaDoc redefinerClass = ContextClassLoader.forName(HOTSWAP_REDEFINER_CLASS_NAME);
40                     return (Redefiner) redefinerClass.newInstance();
41                 } catch (ClassNotFoundException JavaDoc e) {
42                     // TODO this message will be wrong if Java 5 did not started a preMain
43 throw new WrappedRuntimeException(
44                             "redefiner class [HotSwapRedefiner] could not be found on classpath, make sure you have the aspectwerkz extensions jar file in your classpath",
45                             e
46                     );
47                 } catch (Exception JavaDoc e) {
48                     // TODO this message will be wrong upon Java 5..
49 throw new WrappedRuntimeException("redefiner class [HotSwapRedefiner] could not be instantiated", e);
50                 }
51             }
52
53         } else if (type.equals(Type.JVMTI)) {
54             throw new UnsupportedOperationException JavaDoc("JVMTI is not supported yet");
55         } else {
56             throw new UnsupportedOperationException JavaDoc("unknown redefiner type: " + type.toString());
57         }
58     }
59
60     /**
61      * Type-safe enum for the different redefiner implementations.
62      *
63      * @author <a HREF="mailto:jboner@codehaus.org">Jonas BonŽr </a>
64      */
65     public static class Type {
66         public static final Type HOTSWAP = new Type("HOTSWAP");
67         public static final Type JVMTI = new Type("JVMTI");
68
69         private final String JavaDoc m_name;
70
71         private Type(String JavaDoc name) {
72             m_name = name;
73         }
74
75         public String JavaDoc toString() {
76             return m_name;
77         }
78     }
79 }
80
Popular Tags