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23 results

ParameterCheck.java

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  • GenerifyStackTraces.java 5.61 KiB
    /*
     * Copyright (c) 2004, 2013, 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.
     */
    
    /*
     * @test
     * @bug     4919105 8004177
     * @summary Generified basic unit test of Thread.getAllStackTraces()
     * @author  Mandy Chung
     */
    
    import java.util.*;
    
    public class GenerifyStackTraces {
    
        private static Object go = new Object();
        private static String[] methodNames = {"run", "A", "B", "C", "Done"};
        private static int DONE_DEPTH = 5;
        private static boolean testFailed = false;
    
        private static Thread one;
        private static boolean trace = false;
        public static void main(String[] args) throws Exception {
            if (args.length > 0 && args[0].equals("trace")) {
                trace = true;
            }
    
            one = new ThreadOne();
            one.start();
    
            DumpThread dt = new DumpThread();
            dt.start();
    
            try {
                one.join();
            } finally {
                dt.shutdown();
            }
    
            if (testFailed) {
                throw new RuntimeException("Test Failed.");
            }
        }
    
        static class DumpThread extends Thread {
            private volatile boolean finished = false;
    
            public void run() {
                int depth = 2;
                while (!finished) {
                    // At each iterator, wait until ThreadOne blocks
                    // to wait for thread dump.
                    // Then dump stack trace and notify ThreadOne to continue.
                    try {
                        sleep(2000);
                        dumpStacks(depth);
                        depth++;
                        finishDump();
                    } catch (Exception e) {
                        e.printStackTrace();
                        testFailed = true;
                    }
                }
            }
    
            public void shutdown() throws InterruptedException {
                finished = true;
                this.join();
            }
        }
    
        static class ThreadOne extends Thread {
            public void run() {
                A();
            }
            private void A() {
                waitForDump();
                B();
            }
            private void B() {
                waitForDump();
                C();
            }
            private void C() {
                waitForDump();
                Done();
            }
            private void Done() {
                waitForDump();
    
                // Get stack trace of current thread
                StackTraceElement[] stack = getStackTrace();
                try {
                    checkStack(this, stack, DONE_DEPTH);
                } catch (Exception e) {
                    e.printStackTrace();
                    testFailed = true;
                }
            }
    
        }
    
    
        private static void waitForDump() {
            synchronized(go) {
                try {
                   go.wait();
                } catch (Exception e) {
                   throw new RuntimeException("Unexpected exception" + e);
                }
            }
        }
    
        private static void finishDump() {
            synchronized(go) {
                try {
                   go.notifyAll();
                } catch (Exception e) {
                   throw new RuntimeException("Unexpected exception" + e);
                }
            }
        }
    
        public static void dumpStacks(int depth) throws Exception {
            // Get stack trace of another thread
            StackTraceElement[] stack = one.getStackTrace();
            checkStack(one, stack, depth);
    
    
            // Get stack traces of all Threads
            for (Map.Entry<Thread, StackTraceElement[]> entry :
                     Thread.getAllStackTraces().entrySet()) {
                Thread t = entry.getKey();
                stack = entry.getValue();
                if (t == null || stack == null) {
                    throw new RuntimeException("Null thread or stacktrace returned");
                }
                if (t == one) {
                    checkStack(t, stack, depth);
                }
            }
        }
    
        private static void checkStack(Thread t, StackTraceElement[] stack,
                                       int depth) throws Exception {
            if (trace) {
                printStack(t, stack);
            }
            int frame = stack.length - 1;
            for (int i = 0; i < depth && frame >= 0; i++) {
                if (! stack[frame].getMethodName().equals(methodNames[i])) {
                    throw new RuntimeException("Expected " + methodNames[i] +
                                               " in frame " + frame + " but got " +
                                               stack[frame].getMethodName());
                }
                frame--;
            }
        }
    
        private static void printStack(Thread t, StackTraceElement[] stack) {
            System.out.println(t +
                               " stack: (length = " + stack.length + ")");
            if (t != null) {
                for (int j = 0; j < stack.length; j++) {
                    System.out.println(stack[j]);
                }
                System.out.println();
            }
        }
    }