J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @test |
| 26 | * @bug 5086470 6358247 |
| 27 | * @summary Test type conversion when invoking ThreadMXBean.dumpAllThreads |
| 28 | * through proxy. |
| 29 | * |
| 30 | * @author Mandy Chung |
| 31 | * |
| 32 | * @run main ThreadMXBeanProxy |
| 33 | */ |
| 34 | |
| 35 | import static java.lang.management.ManagementFactory.*; |
| 36 | import java.lang.management.*; |
| 37 | import java.util.*; |
| 38 | import java.util.concurrent.locks.*; |
| 39 | import java.util.concurrent.TimeUnit; |
| 40 | import java.io.*; |
| 41 | import javax.management.*; |
| 42 | |
| 43 | public class ThreadMXBeanProxy { |
| 44 | private static MBeanServer server = |
| 45 | ManagementFactory.getPlatformMBeanServer(); |
| 46 | private static ThreadMXBean mbean; |
| 47 | static Mutex mutex = new Mutex(); |
| 48 | static Object lock = new Object(); |
| 49 | static MyThread thread = new MyThread(); |
| 50 | public static void main(String[] argv) throws Exception { |
| 51 | mbean = newPlatformMXBeanProxy(server, |
| 52 | THREAD_MXBEAN_NAME, |
| 53 | ThreadMXBean.class); |
| 54 | |
| 55 | if (!mbean.isSynchronizerUsageSupported()) { |
| 56 | System.out.println("Monitoring of synchronizer usage not supported"); |
| 57 | return; |
| 58 | } |
| 59 | |
| 60 | thread.setDaemon(true); |
| 61 | thread.start(); |
| 62 | |
| 63 | // wait until myThread acquires mutex |
| 64 | while (!mutex.isLocked()) { |
| 65 | try { |
| 66 | Thread.sleep(100); |
| 67 | } catch (InterruptedException e) { |
| 68 | throw new RuntimeException(e); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | long[] ids = new long[] { thread.getId() }; |
| 73 | |
| 74 | // validate the local access |
| 75 | ThreadInfo[] infos = getThreadMXBean().getThreadInfo(ids, true, true); |
| 76 | if (ids.length != 1) { |
| 77 | throw new RuntimeException("Returned ThreadInfo[] of length=" + |
| 78 | ids.length + ". Expected to be 1."); |
| 79 | } |
| 80 | thread.checkThreadInfo(infos[0]); |
| 81 | |
| 82 | // validate the remote access |
| 83 | infos = mbean.getThreadInfo(ids, true, true); |
| 84 | if (ids.length != 1) { |
| 85 | throw new RuntimeException("Returned ThreadInfo[] of length=" + |
| 86 | ids.length + ". Expected to be 1."); |
| 87 | } |
| 88 | thread.checkThreadInfo(infos[0]); |
| 89 | |
| 90 | boolean found = false; |
| 91 | infos = mbean.dumpAllThreads(true, true); |
| 92 | for (ThreadInfo ti : infos) { |
| 93 | if (ti.getThreadId() == thread.getId()) { |
| 94 | thread.checkThreadInfo(ti); |
| 95 | found = true; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | if (!found) { |
| 100 | throw new RuntimeException("No ThreadInfo found for MyThread"); |
| 101 | } |
| 102 | |
| 103 | System.out.println("Test passed"); |
| 104 | } |
| 105 | |
| 106 | static class MyThread extends Thread { |
| 107 | public MyThread() { |
| 108 | super("MyThread"); |
| 109 | } |
| 110 | public void run() { |
| 111 | synchronized (lock) { |
| 112 | mutex.lock(); |
| 113 | Object o = new Object(); |
| 114 | synchronized(o) { |
| 115 | try { |
| 116 | o.wait(); |
| 117 | } catch (InterruptedException e) { |
| 118 | throw new RuntimeException(e); |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | int OWNED_MONITORS = 1; |
| 125 | int OWNED_SYNCS = 1; |
| 126 | void checkThreadInfo(ThreadInfo info) { |
| 127 | if (!getName().equals(info.getThreadName())) { |
| 128 | throw new RuntimeException("Name: " + info.getThreadName() + |
| 129 | " not matched. Expected: " + getName()); |
| 130 | } |
| 131 | |
| 132 | MonitorInfo[] monitors = info.getLockedMonitors(); |
| 133 | if (monitors.length != OWNED_MONITORS) { |
| 134 | throw new RuntimeException("Number of locked monitors = " + |
| 135 | monitors.length + |
| 136 | " not matched. Expected: " + OWNED_MONITORS); |
| 137 | } |
| 138 | MonitorInfo m = monitors[0]; |
| 139 | StackTraceElement ste = m.getLockedStackFrame(); |
| 140 | int depth = m.getLockedStackDepth(); |
| 141 | StackTraceElement[] stacktrace = info.getStackTrace(); |
| 142 | if (!ste.equals(stacktrace[depth])) { |
| 143 | System.out.println("LockedStackFrame:- " + ste); |
| 144 | System.out.println("StackTrace at " + depth + " :-" + |
| 145 | stacktrace[depth]); |
| 146 | throw new RuntimeException("LockedStackFrame does not match " + |
| 147 | "stack frame in ThreadInfo.getStackTrace"); |
| 148 | } |
| 149 | |
| 150 | String className = lock.getClass().getName(); |
| 151 | int hcode = System.identityHashCode(lock); |
| 152 | if (!className.equals(m.getClassName()) || |
| 153 | hcode != m.getIdentityHashCode() || |
| 154 | !m.getLockedStackFrame().getMethodName().equals("run")) { |
| 155 | System.out.println(info); |
| 156 | throw new RuntimeException("MonitorInfo " + m + |
| 157 | " doesn't match."); |
| 158 | } |
| 159 | |
| 160 | LockInfo[] syncs = info.getLockedSynchronizers(); |
| 161 | if (syncs.length != OWNED_SYNCS) { |
| 162 | throw new RuntimeException("Number of locked syncs = " + |
| 163 | syncs.length + |
| 164 | " not matched. Expected: " + OWNED_SYNCS); |
| 165 | } |
| 166 | AbstractOwnableSynchronizer s = mutex.getSync(); |
| 167 | String lockName = s.getClass().getName(); |
| 168 | hcode = System.identityHashCode(s); |
| 169 | if (!lockName.equals(syncs[0].getClassName())) { |
| 170 | throw new RuntimeException("LockInfo : " + syncs[0] + |
| 171 | " class name not matched. Expected: " + lockName); |
| 172 | } |
| 173 | if (hcode != syncs[0].getIdentityHashCode()) { |
| 174 | throw new RuntimeException("LockInfo: " + syncs[0] + |
| 175 | " IdentityHashCode not matched. Expected: " + hcode); |
| 176 | } |
| 177 | |
| 178 | } |
| 179 | } |
| 180 | static class Mutex implements Lock, java.io.Serializable { |
| 181 | |
| 182 | // Our internal helper class |
| 183 | class Sync extends AbstractQueuedSynchronizer { |
| 184 | // Report whether in locked state |
| 185 | protected boolean isHeldExclusively() { |
| 186 | return getState() == 1; |
| 187 | } |
| 188 | |
| 189 | // Acquire the lock if state is zero |
| 190 | public boolean tryAcquire(int acquires) { |
| 191 | assert acquires == 1; // Otherwise unused |
| 192 | if (compareAndSetState(0, 1)) { |
| 193 | setExclusiveOwnerThread(Thread.currentThread()); |
| 194 | return true; |
| 195 | } |
| 196 | return false; |
| 197 | } |
| 198 | |
| 199 | // Release the lock by setting state to zero |
| 200 | protected boolean tryRelease(int releases) { |
| 201 | assert releases == 1; // Otherwise unused |
| 202 | if (getState() == 0) throw new IllegalMonitorStateException(); |
| 203 | setExclusiveOwnerThread(null); |
| 204 | setState(0); |
| 205 | return true; |
| 206 | } |
| 207 | |
| 208 | // Provide a Condition |
| 209 | Condition newCondition() { return new ConditionObject(); } |
| 210 | |
| 211 | // Deserialize properly |
| 212 | private void readObject(ObjectInputStream s) |
| 213 | throws IOException, ClassNotFoundException { |
| 214 | s.defaultReadObject(); |
| 215 | setState(0); // reset to unlocked state |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | // The sync object does all the hard work. We just forward to it. |
| 220 | private final Sync sync = new Sync(); |
| 221 | |
| 222 | public void lock() { sync.acquire(1); } |
| 223 | public boolean tryLock() { return sync.tryAcquire(1); } |
| 224 | public void unlock() { sync.release(1); } |
| 225 | public Condition newCondition() { return sync.newCondition(); } |
| 226 | public boolean isLocked() { return sync.isHeldExclusively(); } |
| 227 | public boolean hasQueuedThreads() { return sync.hasQueuedThreads(); } |
| 228 | public void lockInterruptibly() throws InterruptedException { |
| 229 | sync.acquireInterruptibly(1); |
| 230 | } |
| 231 | public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException { |
| 232 | return sync.tryAcquireNanos(1, unit.toNanos(timeout)); |
| 233 | } |
| 234 | |
| 235 | public AbstractOwnableSynchronizer getSync() { return sync; } |
| 236 | } |
| 237 | } |