| /* |
| * Copyright (c) 2005, 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. |
| */ |
| |
| /* |
| * @test |
| * @bug 5086470 6358247 7193302 |
| * @summary Test type conversion when invoking ThreadMXBean.dumpAllThreads |
| * through proxy. |
| * @author Mandy Chung |
| * |
| * @run main ThreadMXBeanProxy |
| */ |
| |
| import static java.lang.management.ManagementFactory.*; |
| import java.lang.management.*; |
| import java.util.*; |
| import java.util.concurrent.locks.*; |
| import java.util.concurrent.TimeUnit; |
| import java.io.*; |
| import javax.management.*; |
| |
| public class ThreadMXBeanProxy { |
| private static MBeanServer server = |
| ManagementFactory.getPlatformMBeanServer(); |
| private static ThreadMXBean mbean; |
| static Mutex mutex = new Mutex(); |
| static Object lock = new Object(); |
| static MyThread thread = new MyThread(); |
| public static void main(String[] argv) throws Exception { |
| mbean = newPlatformMXBeanProxy(server, |
| THREAD_MXBEAN_NAME, |
| ThreadMXBean.class); |
| |
| if (!mbean.isSynchronizerUsageSupported()) { |
| System.out.println("Monitoring of synchronizer usage not supported"); |
| return; |
| } |
| |
| thread.setDaemon(true); |
| thread.start(); |
| |
| // wait until myThread acquires mutex and lock owner is set. |
| while (!(mutex.isLocked() && mutex.getLockOwner() == thread)) { |
| try { |
| Thread.sleep(100); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| long[] ids = new long[] { thread.getId() }; |
| |
| // validate the local access |
| ThreadInfo[] infos = getThreadMXBean().getThreadInfo(ids, true, true); |
| if (infos.length != 1) { |
| throw new RuntimeException("Returned ThreadInfo[] of length=" + |
| infos.length + ". Expected to be 1."); |
| } |
| thread.checkThreadInfo(infos[0]); |
| |
| // validate the remote access |
| infos = mbean.getThreadInfo(ids, true, true); |
| if (infos.length != 1) { |
| throw new RuntimeException("Returned ThreadInfo[] of length=" + |
| infos.length + ". Expected to be 1."); |
| } |
| thread.checkThreadInfo(infos[0]); |
| |
| boolean found = false; |
| infos = mbean.dumpAllThreads(true, true); |
| for (ThreadInfo ti : infos) { |
| if (ti.getThreadId() == thread.getId()) { |
| thread.checkThreadInfo(ti); |
| found = true; |
| } |
| } |
| |
| if (!found) { |
| throw new RuntimeException("No ThreadInfo found for MyThread"); |
| } |
| |
| System.out.println("Test passed"); |
| } |
| |
| static class MyThread extends Thread { |
| public MyThread() { |
| super("MyThread"); |
| } |
| public void run() { |
| synchronized (lock) { |
| mutex.lock(); |
| Object o = new Object(); |
| synchronized(o) { |
| try { |
| o.wait(); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| } |
| |
| int OWNED_MONITORS = 1; |
| int OWNED_SYNCS = 1; |
| void checkThreadInfo(ThreadInfo info) { |
| if (!getName().equals(info.getThreadName())) { |
| throw new RuntimeException("Name: " + info.getThreadName() + |
| " not matched. Expected: " + getName()); |
| } |
| |
| MonitorInfo[] monitors = info.getLockedMonitors(); |
| if (monitors.length != OWNED_MONITORS) { |
| throw new RuntimeException("Number of locked monitors = " + |
| monitors.length + |
| " not matched. Expected: " + OWNED_MONITORS); |
| } |
| MonitorInfo m = monitors[0]; |
| StackTraceElement ste = m.getLockedStackFrame(); |
| int depth = m.getLockedStackDepth(); |
| StackTraceElement[] stacktrace = info.getStackTrace(); |
| if (!ste.equals(stacktrace[depth])) { |
| System.out.println("LockedStackFrame:- " + ste); |
| System.out.println("StackTrace at " + depth + " :-" + |
| stacktrace[depth]); |
| throw new RuntimeException("LockedStackFrame does not match " + |
| "stack frame in ThreadInfo.getStackTrace"); |
| } |
| |
| String className = lock.getClass().getName(); |
| int hcode = System.identityHashCode(lock); |
| if (!className.equals(m.getClassName()) || |
| hcode != m.getIdentityHashCode() || |
| !m.getLockedStackFrame().getMethodName().equals("run")) { |
| System.out.println(info); |
| throw new RuntimeException("MonitorInfo " + m + |
| " doesn't match."); |
| } |
| |
| LockInfo[] syncs = info.getLockedSynchronizers(); |
| if (syncs.length != OWNED_SYNCS) { |
| throw new RuntimeException("Number of locked syncs = " + |
| syncs.length + " not matched. Expected: " + OWNED_SYNCS); |
| } |
| AbstractOwnableSynchronizer s = mutex.getSync(); |
| String lockName = s.getClass().getName(); |
| hcode = System.identityHashCode(s); |
| if (!lockName.equals(syncs[0].getClassName())) { |
| throw new RuntimeException("LockInfo : " + syncs[0] + |
| " class name not matched. Expected: " + lockName); |
| } |
| if (hcode != syncs[0].getIdentityHashCode()) { |
| throw new RuntimeException("LockInfo: " + syncs[0] + |
| " IdentityHashCode not matched. Expected: " + hcode); |
| } |
| LockInfo li = info.getLockInfo(); |
| if (li == null) { |
| throw new RuntimeException("Expected non-null LockInfo"); |
| } |
| } |
| } |
| static class Mutex implements Lock, java.io.Serializable { |
| |
| // Our internal helper class |
| class Sync extends AbstractQueuedSynchronizer { |
| // Report whether in locked state |
| protected boolean isHeldExclusively() { |
| return getState() == 1; |
| } |
| |
| // Acquire the lock if state is zero |
| public boolean tryAcquire(int acquires) { |
| assert acquires == 1; // Otherwise unused |
| if (compareAndSetState(0, 1)) { |
| setExclusiveOwnerThread(Thread.currentThread()); |
| return true; |
| } |
| return false; |
| } |
| |
| // Release the lock by setting state to zero |
| protected boolean tryRelease(int releases) { |
| assert releases == 1; // Otherwise unused |
| if (getState() == 0) throw new IllegalMonitorStateException(); |
| setExclusiveOwnerThread(null); |
| setState(0); |
| return true; |
| } |
| |
| // Provide a Condition |
| Condition newCondition() { return new ConditionObject(); } |
| |
| // Deserialize properly |
| private void readObject(ObjectInputStream s) |
| throws IOException, ClassNotFoundException { |
| s.defaultReadObject(); |
| setState(0); // reset to unlocked state |
| } |
| |
| protected Thread getLockOwner() { |
| return getExclusiveOwnerThread(); |
| } |
| } |
| |
| // The sync object does all the hard work. We just forward to it. |
| private final Sync sync = new Sync(); |
| |
| public void lock() { sync.acquire(1); } |
| public boolean tryLock() { return sync.tryAcquire(1); } |
| public void unlock() { sync.release(1); } |
| public Condition newCondition() { return sync.newCondition(); } |
| public boolean isLocked() { return sync.isHeldExclusively(); } |
| public boolean hasQueuedThreads() { return sync.hasQueuedThreads(); } |
| public void lockInterruptibly() throws InterruptedException { |
| sync.acquireInterruptibly(1); |
| } |
| public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException { |
| return sync.tryAcquireNanos(1, unit.toNanos(timeout)); |
| } |
| |
| public Thread getLockOwner() { return sync.getLockOwner(); } |
| |
| public AbstractOwnableSynchronizer getSync() { return sync; } |
| } |
| } |