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annotate graal/com.oracle.max.graal.hotspot/src/com/oracle/max/graal/hotspot/logging/LoggingProxy.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.max.graal.hotspot.logging;
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24
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25 import java.lang.reflect.*;
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26
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27 import com.oracle.max.graal.hotspot.server.*;
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28
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29 /**
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30 * A java.lang.reflect proxy that hierarchically logs all method invocations along with their parameters and return values.
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31 */
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32 public class LoggingProxy<T> implements InvocationHandler {
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33
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34 private T delegate;
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35
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36 public LoggingProxy(T delegate) {
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37 this.delegate = delegate;
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38 }
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39
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40 @Override
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41 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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42 int argCount = args == null ? 0 : args.length;
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43 if (method.getParameterTypes().length != argCount) {
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44 throw new RuntimeException("wrong parameter count");
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45 }
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46 StringBuilder str = new StringBuilder();
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47 str.append(method.getReturnType().getSimpleName() + " " + method.getDeclaringClass().getSimpleName() + "." + method.getName() + "(");
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48 for (int i = 0; i < argCount; i++) {
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49 str.append(i == 0 ? "" : ", ");
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50 str.append(Logger.pretty(args[i]));
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51 }
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52 str.append(")");
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53 Logger.startScope(str.toString());
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54 final Object result;
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55 try {
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56 if (args == null) {
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57 result = method.invoke(delegate);
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58 } else {
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59 result = method.invoke(delegate, args);
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60 }
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61 } catch (InvocationTargetException e) {
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62 Logger.endScope(" = Exception " + e.getMessage());
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63 throw e.getCause();
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64 }
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65 Logger.endScope(" = " + Logger.pretty(result));
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66 return result;
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67 }
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68
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69 /**
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70 * The object returned by this method will implement all interfaces that are implemented by delegate.
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71 */
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72 public static <T> T getProxy(Class<T> interf, T delegate) {
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73 Class<?>[] interfaces = ReplacingStreams.getAllInterfaces(delegate.getClass());
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74 Object obj = Proxy.newProxyInstance(interf.getClassLoader(), interfaces, new LoggingProxy<>(delegate));
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75 return interf.cast(obj);
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76 }
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77 }