1 /* 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 4593133 27 * @summary Basic unit test of Thread.getStackTraces() 28 * @author Mandy Chung 29 */ 30 31 import java.util.*; 32 33 public class StackTraces { 34 35 private static Object go = new Object(); 36 private static Object dumpObj = new Object(); 37 private static String[] methodNames = {"run", "A", "B", "C", "Done"}; 38 private static int DONE_DEPTH = 5; 39 private static boolean testFailed = false; 40 41 private static Thread one; 42 private static boolean trace = false; 43 public static void main(String[] args) throws Exception { 44 if (args.length > 0 && args[0].equals("trace")) { 45 trace = true; 46 } 47 48 one = new ThreadOne(); 49 one.start(); 50 51 Thread dt = new DumpThread(); 52 dt.setDaemon(true); 53 dt.start(); 54 55 if (testFailed) { 56 throw new RuntimeException("Test Failed."); 57 } 58 } 59 60 static class DumpThread extends Thread { 61 public void run() { 62 int depth = 2; 63 while (true) { 64 // At each iterator, wait until ThreadOne blocks 65 // to wait for thread dump. 66 // Then dump stack trace and notify ThreadOne to continue. 67 try { 68 sleep(2000); 69 dumpStacks(depth); 70 depth++; 71 finishDump(); 72 } catch (Exception e) { 73 e.printStackTrace(); 74 testFailed = true; 75 } 76 } 77 } 78 } 79 80 static class ThreadOne extends Thread { 81 public void run() { 82 A(); 83 } 84 private void A() { 85 waitForDump(); 86 B(); 87 } 88 private void B() { 89 waitForDump(); 90 C(); 91 } 92 private void C() { 93 waitForDump(); 94 Done(); 95 } 96 private void Done() { 97 waitForDump(); 98 99 // Get stack trace of current thread 100 StackTraceElement[] stack = getStackTrace(); 101 try { 102 checkStack(this, stack, DONE_DEPTH); 103 } catch (Exception e) { 104 e.printStackTrace(); 105 testFailed = true; 106 } 107 } 108 109 } 110 111 112 static private void waitForDump() { 113 synchronized(go) { 114 try { 115 go.wait(); 116 } catch (Exception e) { 117 throw new RuntimeException("Unexpected exception" + e); 118 } 119 } 120 } 121 122 static private void finishDump() { 123 synchronized(go) { 124 try { 125 go.notifyAll(); 126 } catch (Exception e) { 127 throw new RuntimeException("Unexpected exception" + e); 128 } 129 } 130 } 131 132 public static void dumpStacks(int depth) throws Exception { 133 // Get stack trace of another thread 134 StackTraceElement[] stack = one.getStackTrace(); 135 checkStack(one, stack, depth); 136 137 // Get stack traces of all Threads 138 Map m = Thread.getAllStackTraces(); 139 Set s = m.entrySet(); 140 Iterator iter = s.iterator(); 141 142 Map.Entry entry; 143 while (iter.hasNext()) { 144 entry = (Map.Entry) iter.next(); 145 Thread t = (Thread) entry.getKey(); 146 stack = (StackTraceElement[]) entry.getValue(); 147 if (t == null || stack == null) { 148 throw new RuntimeException("Null thread or stacktrace returned"); 149 } 150 if (t == one) { 151 checkStack(t, stack, depth); 152 } 153 } 154 } 155 156 private static void checkStack(Thread t, StackTraceElement[] stack, 157 int depth) throws Exception { 158 if (trace) { 159 printStack(t, stack); 160 } 161 int frame = stack.length - 1; 162 for (int i = 0; i < depth && frame >= 0; i++) { 163 if (! stack[frame].getMethodName().equals(methodNames[i])) { 164 throw new RuntimeException("Expected " + methodNames[i] + 165 " in frame " + frame + " but got " + 166 stack[frame].getMethodName()); 167 } 168 frame--; 169 } 170 } 171 172 private static void printStack(Thread t, StackTraceElement[] stack) { 173 System.out.println(t + 174 " stack: (length = " + stack.length + ")"); 175 if (t != null) { 176 for (int j = 0; j < stack.length; j++) { 177 System.out.println(stack[j]); 178 } 179 System.out.println(); 180 } 181 } 182 }