Mercurial > hg > truffle
diff graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/logging/LoggingProxy.java @ 21551:5324104ac4f3
moved com.oracle.graal.hotspot.jvmci classes to com.oracle.jvmci.hotspot module (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 26 May 2015 17:13:37 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/logging/LoggingProxy.java Tue May 26 17:13:37 2015 +0200 @@ -0,0 +1,77 @@ +/* + * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package com.oracle.jvmci.hotspot.logging; + +import java.lang.reflect.*; + +/** + * A java.lang.reflect proxy that hierarchically logs all method invocations along with their + * parameters and return values. + */ +public class LoggingProxy<T> implements InvocationHandler { + + private T delegate; + + public LoggingProxy(T delegate) { + this.delegate = delegate; + } + + @Override + public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { + int argCount = args == null ? 0 : args.length; + if (method.getParameterTypes().length != argCount) { + throw new RuntimeException("wrong parameter count"); + } + StringBuilder str = new StringBuilder(); + str.append(method.getReturnType().getSimpleName() + " " + method.getDeclaringClass().getSimpleName() + "." + method.getName() + "("); + for (int i = 0; i < argCount; i++) { + str.append(i == 0 ? "" : ", "); + str.append(Logger.pretty(args[i])); + } + str.append(")"); + Logger.startScope(str.toString()); + final Object result; + try { + if (args == null) { + result = method.invoke(delegate); + } else { + result = method.invoke(delegate, args); + } + } catch (InvocationTargetException e) { + Logger.endScope(" = Exception " + e.getMessage()); + throw e.getCause(); + } + Logger.endScope(" = " + Logger.pretty(result)); + return result; + } + + /** + * The object returned by this method will implement all interfaces that are implemented by + * delegate. + */ + public static <T> T getProxy(Class<T> interf, T delegate) { + Class<?>[] interfaces = ProxyUtil.getAllInterfaces(delegate.getClass()); + Object obj = Proxy.newProxyInstance(interf.getClassLoader(), interfaces, new LoggingProxy<>(delegate)); + return interf.cast(obj); + } +}