1 /* 2 * Copyright (c) 2005, 2016, 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 5086470 6358247 7193302 27 * @summary Test type conversion when invoking ThreadMXBean.dumpAllThreads 28 * through proxy. 29 * 30 * @author Mandy Chung 31 * 32 * @modules jdk.management 33 * @run main ThreadMXBeanProxy 34 */ 35 36 import static java.lang.management.ManagementFactory.*; 37 import java.lang.management.*; 38 import java.util.*; 39 import java.util.concurrent.locks.*; 40 import java.util.concurrent.TimeUnit; 41 import java.io.*; 42 import javax.management.*; 43 44 public class ThreadMXBeanProxy { 45 private static MBeanServer server = 46 ManagementFactory.getPlatformMBeanServer(); 47 private static ThreadMXBean mbean; 48 static Mutex mutex = new Mutex(); 49 static Object lock = new Object(); 50 static MyThread thread = new MyThread(); 51 public static void main(String[] argv) throws Exception { 52 mbean = newPlatformMXBeanProxy(server, 53 THREAD_MXBEAN_NAME, 54 ThreadMXBean.class); 55 56 if (!mbean.isSynchronizerUsageSupported()) { 57 System.out.println("Monitoring of synchronizer usage not supported"); 58 return; 59 } 60 61 thread.setDaemon(true); 62 thread.start(); 63 64 // wait until myThread acquires mutex and lock owner is set. 65 while (!(mutex.isLocked() && mutex.getLockOwner() == thread)) { 66 try { 67 Thread.sleep(100); 68 } catch (InterruptedException e) { 69 throw new RuntimeException(e); 70 } 71 } 72 73 long[] ids = new long[] { thread.getId() }; 74 75 // validate the local access 76 ThreadInfo[] infos = getThreadMXBean().getThreadInfo(ids, true, true); 77 if (infos.length != 1) { 78 throw new RuntimeException("Returned ThreadInfo[] of length=" + 79 infos.length + ". Expected to be 1."); 80 } 81 thread.checkThreadInfo(infos[0]); 82 83 // validate the remote access 84 infos = mbean.getThreadInfo(ids, true, true); 85 if (infos.length != 1) { 86 throw new RuntimeException("Returned ThreadInfo[] of length=" + 87 infos.length + ". Expected to be 1."); 88 } 89 thread.checkThreadInfo(infos[0]); 90 91 boolean found = false; 92 infos = mbean.dumpAllThreads(true, true); 93 for (ThreadInfo ti : infos) { 94 if (ti.getThreadId() == thread.getId()) { 95 thread.checkThreadInfo(ti); 96 found = true; 97 } 98 } 99 100 if (!found) { 101 throw new RuntimeException("No ThreadInfo found for MyThread"); 102 } 103 104 System.out.println("Test passed"); 105 } 106 107 static class MyThread extends Thread { 108 public MyThread() { 109 super("MyThread"); 110 } 111 public void run() { 112 synchronized (lock) { 113 mutex.lock(); 114 Object o = new Object(); 115 synchronized(o) { 116 try { 117 o.wait(); 118 } catch (InterruptedException e) { 119 throw new RuntimeException(e); 120 } 121 } 122 } 123 } 124 125 int OWNED_MONITORS = 1; 126 int OWNED_SYNCS = 1; 127 void checkThreadInfo(ThreadInfo info) { 128 if (!getName().equals(info.getThreadName())) { 129 throw new RuntimeException("Name: " + info.getThreadName() + 130 " not matched. Expected: " + getName()); 131 } 132 133 MonitorInfo[] monitors = info.getLockedMonitors(); 134 if (monitors.length != OWNED_MONITORS) { 135 throw new RuntimeException("Number of locked monitors = " + 136 monitors.length + 137 " not matched. Expected: " + OWNED_MONITORS); 138 } 139 MonitorInfo m = monitors[0]; 140 StackTraceElement ste = m.getLockedStackFrame(); 141 int depth = m.getLockedStackDepth(); 142 StackTraceElement[] stacktrace = info.getStackTrace(); 143 if (!ste.equals(stacktrace[depth])) { 144 System.out.println("LockedStackFrame:- " + ste); 145 System.out.println("StackTrace at " + depth + " :-" + 146 stacktrace[depth]); 147 throw new RuntimeException("LockedStackFrame does not match " + 148 "stack frame in ThreadInfo.getStackTrace"); 149 } 150 151 String className = lock.getClass().getName(); 152 int hcode = System.identityHashCode(lock); 153 if (!className.equals(m.getClassName()) || 154 hcode != m.getIdentityHashCode() || 155 !m.getLockedStackFrame().getMethodName().equals("run")) { 156 System.out.println(info); 157 throw new RuntimeException("MonitorInfo " + m + 158 " doesn't match."); 159 } 160 161 LockInfo[] syncs = info.getLockedSynchronizers(); 162 if (syncs.length != OWNED_SYNCS) { 163 throw new RuntimeException("Number of locked syncs = " + 164 syncs.length + " 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 LockInfo li = info.getLockInfo(); 178 if (li == null) { 179 throw new RuntimeException("Expected non-null LockInfo"); 180 } 181 } 182 } 183 static class Mutex implements Lock, java.io.Serializable { 184 185 // Our internal helper class 186 class Sync extends AbstractQueuedSynchronizer { 187 // Report whether in locked state 188 protected boolean isHeldExclusively() { 189 return getState() == 1; 190 } 191 192 // Acquire the lock if state is zero 193 public boolean tryAcquire(int acquires) { 194 assert acquires == 1; // Otherwise unused 195 if (compareAndSetState(0, 1)) { 196 setExclusiveOwnerThread(Thread.currentThread()); 197 return true; 198 } 199 return false; 200 } 201 202 // Release the lock by setting state to zero 203 protected boolean tryRelease(int releases) { 204 assert releases == 1; // Otherwise unused 205 if (getState() == 0) throw new IllegalMonitorStateException(); 206 setExclusiveOwnerThread(null); 207 setState(0); 208 return true; 209 } 210 211 // Provide a Condition 212 Condition newCondition() { return new ConditionObject(); } 213 214 // Deserialize properly 215 private void readObject(ObjectInputStream s) 216 throws IOException, ClassNotFoundException { 217 s.defaultReadObject(); 218 setState(0); // reset to unlocked state 219 } 220 221 protected Thread getLockOwner() { 222 return getExclusiveOwnerThread(); 223 } 224 } 225 226 // The sync object does all the hard work. We just forward to it. 227 private final Sync sync = new Sync(); 228 229 public void lock() { sync.acquire(1); } 230 public boolean tryLock() { return sync.tryAcquire(1); } 231 public void unlock() { sync.release(1); } 232 public Condition newCondition() { return sync.newCondition(); } 233 public boolean isLocked() { return sync.isHeldExclusively(); } 234 public boolean hasQueuedThreads() { return sync.hasQueuedThreads(); } 235 public void lockInterruptibly() throws InterruptedException { 236 sync.acquireInterruptibly(1); 237 } 238 public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException { 239 return sync.tryAcquireNanos(1, unit.toNanos(timeout)); 240 } 241 242 public Thread getLockOwner() { return sync.getLockOwner(); } 243 244 public AbstractOwnableSynchronizer getSync() { return sync; } 245 } 246 }