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/*
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* Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/*
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* @test
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* @bug 4919105
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* @summary Generified basic unit test of Thread.getAllStackTraces()
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* @author Mandy Chung
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*/
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import java.util.*;
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public class GenerifyStackTraces {
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private static Object go = new Object();
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private static Object dumpObj = new Object();
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private static String[] methodNames = {"run", "A", "B", "C", "Done"};
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private static int DONE_DEPTH = 5;
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private static boolean testFailed = false;
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private static Thread one;
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private static boolean trace = false;
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public static void main(String[] args) throws Exception {
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if (args.length > 0 && args[0].equals("trace")) {
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trace = true;
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}
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one = new ThreadOne();
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one.start();
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Thread dt = new DumpThread();
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dt.setDaemon(true);
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dt.start();
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if (testFailed) {
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throw new RuntimeException("Test Failed.");
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}
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}
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static class DumpThread extends Thread {
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public void run() {
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int depth = 2;
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while (true) {
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// At each iterator, wait until ThreadOne blocks
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// to wait for thread dump.
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// Then dump stack trace and notify ThreadOne to continue.
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try {
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sleep(2000);
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dumpStacks(depth);
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depth++;
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finishDump();
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} catch (Exception e) {
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e.printStackTrace();
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testFailed = true;
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}
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}
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}
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}
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static class ThreadOne extends Thread {
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public void run() {
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A();
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}
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private void A() {
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waitForDump();
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B();
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}
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private void B() {
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waitForDump();
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C();
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}
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private void C() {
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waitForDump();
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Done();
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}
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private void Done() {
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waitForDump();
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// Get stack trace of current thread
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StackTraceElement[] stack = getStackTrace();
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try {
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checkStack(this, stack, DONE_DEPTH);
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} catch (Exception e) {
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e.printStackTrace();
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testFailed = true;
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}
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}
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}
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static private void waitForDump() {
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synchronized(go) {
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try {
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go.wait();
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} catch (Exception e) {
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throw new RuntimeException("Unexpected exception" + e);
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}
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}
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}
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static private void finishDump() {
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synchronized(go) {
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try {
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go.notifyAll();
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} catch (Exception e) {
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throw new RuntimeException("Unexpected exception" + e);
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}
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}
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}
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public static void dumpStacks(int depth) throws Exception {
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// Get stack trace of another thread
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StackTraceElement[] stack = one.getStackTrace();
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checkStack(one, stack, depth);
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// Get stack traces of all Threads
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for (Map.Entry<Thread, StackTraceElement[]> entry :
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Thread.getAllStackTraces().entrySet()) {
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Thread t = entry.getKey();
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stack = entry.getValue();
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if (t == null || stack == null) {
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throw new RuntimeException("Null thread or stacktrace returned");
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}
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if (t == one) {
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checkStack(t, stack, depth);
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}
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}
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}
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private static void checkStack(Thread t, StackTraceElement[] stack,
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int depth) throws Exception {
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if (trace) {
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printStack(t, stack);
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}
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int frame = stack.length - 1;
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for (int i = 0; i < depth; i++) {
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if (! stack[frame].getMethodName().equals(methodNames[i])) {
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throw new RuntimeException("Expected " + methodNames[i] +
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" in frame " + frame + " but got " +
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stack[frame].getMethodName());
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}
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frame--;
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}
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}
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private static void printStack(Thread t, StackTraceElement[] stack) {
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System.out.println(t +
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" stack: (length = " + stack.length + ")");
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if (t != null) {
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for (int j = 0; j < stack.length; j++) {
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System.out.println(stack[j]);
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}
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System.out.println();
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}
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}
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}
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