| /* |
| * Copyright (c) 2016, 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.app; |
| |
| import java.lang.StackWalker.StackFrame; |
| import java.lang.module.ModuleDescriptor; |
| import java.util.Objects; |
| |
| public class Utils { |
| public static void verify(Class<?> caller, String loaderName, |
| String methodname, String filename) { |
| StackTraceElement[] stes = Thread.currentThread().getStackTrace(); |
| StackWalker.StackFrame[] frames = new StackFrame[] { |
| makeStackFrame(Utils.class, "verify", "Utils.java"), |
| makeStackFrame(caller, methodname, filename) |
| }; |
| |
| checkFrame("app", frames[0], stes[1]); |
| checkFrame(loaderName, frames[1], stes[2]); |
| } |
| |
| public static StackFrame makeStackFrame(Class<?> c, String methodname, String filename) { |
| return new StackFrame() { |
| @Override |
| public String getClassName() { |
| return c.getName(); |
| } |
| @Override |
| public String getMethodName() { |
| return methodname; |
| } |
| @Override |
| public Class<?> getDeclaringClass() { |
| return c; |
| } |
| @Override |
| public int getByteCodeIndex() { |
| return 0; |
| } |
| @Override |
| public String getFileName() { |
| return filename; |
| } |
| |
| @Override |
| public int getLineNumber() { |
| return 0; |
| } |
| @Override |
| public boolean isNativeMethod() { |
| return false; |
| } |
| @Override |
| public StackTraceElement toStackTraceElement() { |
| return null; |
| } |
| |
| private String getClassLoaderName(Class<?> c) { |
| ClassLoader loader = c.getClassLoader(); |
| String name = ""; |
| if (loader == null) { |
| name = "boot"; |
| } else if (loader.getName() != null) { |
| name = loader.getName(); |
| } |
| return name; |
| } |
| |
| @Override |
| public String toString() { |
| String mid = getClassLoaderName(c); |
| Module module = c.getModule(); |
| if (module.isNamed()) { |
| ModuleDescriptor md = module.getDescriptor(); |
| mid = md.name(); |
| if (md.version().isPresent()) |
| mid += "@" + md.version().get().toString(); |
| mid += "/"; |
| } |
| String fileName = getFileName(); |
| int lineNumber = getLineNumber(); |
| String sourceinfo = "Unknown Source"; |
| if (isNativeMethod()) { |
| sourceinfo = "Native Method"; |
| } else if (fileName != null && lineNumber >= 0) { |
| sourceinfo = fileName + ":" + lineNumber; |
| } |
| return String.format("%s/%s.%s(%s)", mid, getClassName(), getMethodName(), |
| sourceinfo); |
| |
| } |
| }; |
| } |
| |
| public static void checkFrame(String loaderName, StackFrame frame, |
| StackTraceElement ste) { |
| System.err.println("checking " + ste.toString() + " expected: " + frame.toString()); |
| Class<?> c = frame.getDeclaringClass(); |
| Module module = c.getModule(); |
| assertEquals(ste.getModuleName(), module.getName(), "module name"); |
| assertEquals(ste.getClassLoaderName(), loaderName, "class loader name"); |
| assertEquals(ste.getClassLoaderName(), c.getClassLoader().getName(), |
| "class loader name"); |
| assertEquals(ste.getClassName(), c.getName(), "class name"); |
| assertEquals(ste.getMethodName(), frame.getMethodName(), "method name"); |
| assertEquals(ste.getFileName(), frame.getFileName(), "file name"); |
| |
| } |
| private static void assertEquals(String actual, String expected, String msg) { |
| if (!Objects.equals(actual, expected)) |
| throw new AssertionError("Actual: " + actual + " Excepted: " + |
| expected + " mismatched " + msg); |
| } |
| } |