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comparison c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/logging/LoggingProxy.java @ 1423:760213a60e8b

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* rewrite of the code installation * partial support for safepoints * macro-based CiTargetMethod interface * code stub support
author Lukas Stadler <lukas.stadler@oracle.com>
date Mon, 16 Aug 2010 18:59:36 -0700
parents c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/LoggingProxy.java@3483ec571caf
children 9e5e83ca2259
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1422:3483ec571caf 1423:760213a60e8b
1 /*
2 * Copyright (c) 2010 Sun Microsystems, Inc. All rights reserved.
3 *
4 * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product that is
5 * described in this document. In particular, and without limitation, these intellectual property rights may include one
6 * or more of the U.S. patents listed at http://www.sun.com/patents and one or more additional patents or pending patent
7 * applications in the U.S. and in other countries.
8 *
9 * U.S. Government Rights - Commercial software. Government users are subject to the Sun Microsystems, Inc. standard
10 * license agreement and applicable provisions of the FAR and its supplements.
11 *
12 * Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or registered
13 * trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks are used under license and
14 * are trademarks or registered trademarks of SPARC International, Inc. in the U.S. and other countries.
15 *
16 * UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open Company, Ltd.
17 */
18 package com.sun.hotspot.c1x.logging;
19
20 import java.lang.reflect.*;
21
22 /**
23 * A java.lang.reflect proxy that hierarchically logs all method invocations along with their parameters and return values.
24 *
25 * @author Lukas Stadler
26 */
27 public class LoggingProxy<T> implements InvocationHandler {
28
29 private T delegate;
30
31 public LoggingProxy(T delegate) {
32 this.delegate = delegate;
33 }
34
35 @Override
36 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
37 int argCount = args == null ? 0 : args.length;
38 if (method.getParameterTypes().length != argCount)
39 throw new RuntimeException("wrong parameter count");
40 StringBuilder str = new StringBuilder();
41 str.append(method.getReturnType().getSimpleName() + " " + method.getDeclaringClass().getSimpleName() + "." + method.getName() + "(");
42 for (int i = 0; i < argCount; i++) {
43 str.append(i == 0 ? "" : ", ");
44 str.append(Logger.pretty(args[i]));
45 }
46 str.append(")");
47 Logger.startScope(str.toString());
48 final Object result;
49 try {
50 if (args == null) {
51 result = method.invoke(delegate);
52 } else {
53 result = method.invoke(delegate, args);
54 }
55 } catch (InvocationTargetException e) {
56 Logger.endScope(" = Exception " + e.getMessage());
57 throw e.getCause();
58 }
59 Logger.endScope(" = " + Logger.pretty(result));
60 return result;
61 }
62
63 public static <T> T getProxy(Class<T> interf, T delegate) {
64 Object obj = Proxy.newProxyInstance(interf.getClassLoader(), new Class[] { interf}, new LoggingProxy<T>(delegate));
65 return interf.cast(obj);
66 }
67 }