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annotate c1x4hotspotsrc/HotSpotVM/src/com/sun/hotspot/c1x/logging/LoggingProxy.java @ 1455:43a93774d24f

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Syncing changes with C1X.
author Doug Simon <doug.simon@oracle.com>
date Fri, 12 Nov 2010 16:11:41 +0100
parents 9e5e83ca2259
children 8c426c2891c8
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1 /*
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2 * Copyright (c) 2010 Sun Microsystems, Inc. All rights reserved.
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3 *
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4 * Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product
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5 * that is described in this document. In particular, and without limitation, these intellectual property
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6 * rights may include one or more of the U.S. patents listed at http://www.sun.com/patents and one or
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7 * more additional patents or pending patent applications in the U.S. and in other countries.
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8 *
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9 * U.S. Government Rights - Commercial software. Government users are subject to the Sun
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10 * Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its
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11 * supplements.
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12 *
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13 * Use is subject to license terms. Sun, Sun Microsystems, the Sun logo, Java and Solaris are trademarks or
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14 * registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. All SPARC trademarks
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15 * are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the
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16 * U.S. and other countries.
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17 *
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18 * UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open
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19 * Company, Ltd.
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20 */
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21 package com.sun.hotspot.c1x.logging;
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23 import java.lang.reflect.*;
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24
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25 /**
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26 * A java.lang.reflect proxy that hierarchically logs all method invocations along with their parameters and return values.
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27 *
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28 * @author Lukas Stadler
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29 */
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30 public class LoggingProxy<T> implements InvocationHandler {
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31
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32 private T delegate;
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33
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34 public LoggingProxy(T delegate) {
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35 this.delegate = delegate;
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36 }
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37
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38 @Override
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39 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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40 int argCount = args == null ? 0 : args.length;
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41 if (method.getParameterTypes().length != argCount) {
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42 throw new RuntimeException("wrong parameter count");
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43 }
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44 StringBuilder str = new StringBuilder();
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45 str.append(method.getReturnType().getSimpleName() + " " + method.getDeclaringClass().getSimpleName() + "." + method.getName() + "(");
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46 for (int i = 0; i < argCount; i++) {
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47 str.append(i == 0 ? "" : ", ");
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48 str.append(Logger.pretty(args[i]));
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49 }
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50 str.append(")");
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51 Logger.startScope(str.toString());
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52 final Object result;
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53 try {
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54 if (args == null) {
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55 result = method.invoke(delegate);
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56 } else {
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57 result = method.invoke(delegate, args);
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58 }
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59 } catch (InvocationTargetException e) {
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60 Logger.endScope(" = Exception " + e.getMessage());
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61 throw e.getCause();
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62 }
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63 Logger.endScope(" = " + Logger.pretty(result));
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64 return result;
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65 }
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66
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67 public static <T> T getProxy(Class<T> interf, T delegate) {
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68 Object obj = Proxy.newProxyInstance(interf.getClassLoader(), new Class[] {interf}, new LoggingProxy<T>(delegate));
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69 return interf.cast(obj);
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70 }
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71 }