Java State.BLOCKED屬性代碼示例

/** taken from sun.misc.VM
 * 
 * Returns Thread.State for the given threadStatus
 */
private static Thread.State toThreadState(int threadStatus) {
    if ((threadStatus & JVMTI_THREAD_STATE_RUNNABLE) != 0) {
        return State.RUNNABLE;
    } else if ((threadStatus & JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER) != 0) {
        return State.BLOCKED;
    } else if ((threadStatus & JVMTI_THREAD_STATE_WAITING_INDEFINITELY) != 0) {
        return State.WAITING;
    } else if ((threadStatus & JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT) != 0) {
        return State.TIMED_WAITING;
    } else if ((threadStatus & JVMTI_THREAD_STATE_TERMINATED) != 0) {
        return State.TERMINATED;
    } else if ((threadStatus & JVMTI_THREAD_STATE_ALIVE) == 0) {
        return State.NEW;
    } else {
        return State.RUNNABLE;
    }
}
 

private void setNewDataWorker() {
	if (this.dataThread != null) {
		this.dataWorker.induceStop();
		if (this.dataThread != Thread.currentThread()) {
			State state = this.dataThread.getState();
			if (state == State.BLOCKED || state == State.WAITING)
				this.dataThread.interrupt();
		}
	}

	this.dataTasks = new LinkedBlockingQueue<DataTask>();
	this.dataWorker = new DataWorker(this, this.currentSession, this.dataTasks);
	this.dataThread = new Thread(dataWorker);
	this.dataThread.setName("Data Worker for " + this.currentSession);
	this.dataThread.start();
}
 

@Test
public void asEnum() throws Exception {
    final State expected = State.BLOCKED;
    assertEquals(expected, new RestValue("BLOCKED").asEnum(State.class));
}
 

private static void checkForDeadlock(EditingDomain domain) {
	try {
		// I am the display thread
		if (domain instanceof InternalTransactionalEditingDomain) {
			InternalTransactionalEditingDomain internalDomain = (InternalTransactionalEditingDomain) domain;
			InternalTransaction activeTransaction = internalDomain.getActiveTransaction();
			if (activeTransaction != null) {
				// There is already an active transaction
				Thread owner = activeTransaction.getOwner();
				Thread currentThread = Thread.currentThread();
				if (owner != currentThread) {
					// I'm going to block/run display runnable
					if (owner.getState() == State.BLOCKED) {
						checkForBasicDeadlock();
						// The transaction owner is blocked too
						long ownerId = owner.getId();
						ThreadInfo threadInfo = null;
						long nextId = ownerId;
						while (nextId != -1) {
							threadInfo = THREAD_MX_BEAN.getThreadInfo(nextId, 2);
							if (threadInfo == null) {
								break; // the thread being blocked on has terminated
							}
							nextId = threadInfo.getLockOwnerId();
							if (nextId == ownerId) {
								String message = "the transaction is held by a deadlock 2";
								Logger.getLogger(TransactionUtils.class).error(message);
							}
						}
						checkForThreadJobJoinRun(threadInfo);
					}
				}
			}
		}
	} catch (RuntimeException e) {
		Logger.getLogger(TransactionUtils.class).error("exception in TransactionUtils", e);
	}
}
 

public static void shutdownThreads() {
	if (persistenceThread != null) {
		worker.induceStop();
		State state = persistenceThread.getState();
		int tasks = worker.getNumTasks();
		if (tasks == 0 && (state == State.BLOCKED || state == State.WAITING))
			persistenceThread.interrupt();
		persistenceThread = null;
	}
}
 

/**
 * Tests the improvement added by using a SecureRandom pool when generating GUID's 
 */
public void testGuid()
{
    // warm-up (to pre-init the secureRandomArray)
    GUID.generate();

    List<Thread> threads = new ArrayList<>();
    int n = 30;
    
    for (int i = 0; i < n; i++)
    {
        Thread thread = new Thread(new GuidRunner());
        threads.add(thread);
        thread.start();
    }
    
    Set<String> blocked = new HashSet<String>();
    Set<String> terminated = new HashSet<String>();

    int maxItemsBlocked = 0;

    while (terminated.size() != n)
    {
        for (Thread current : threads)
        {
            State state = current.getState();
            String name = current.getName();

            if (state == State.BLOCKED)
            {
                if (!blocked.contains(name))
                {
                    blocked.add(name);
                    maxItemsBlocked = blocked.size() > maxItemsBlocked ? blocked.size() : maxItemsBlocked;
                }
            }
            else // not BLOCKED, eg. RUNNABLE, TERMINATED, ...
            {
                blocked.remove(name);
                if (state == State.TERMINATED && !terminated.contains(name))
                {
                    terminated.add(name);
                }
            }
        }
    }
    
    //worst case scenario : max number of threads blocked at a moment = number of threads - 2 ( usually ~5 for 30 threads)
    //the implementation without RandomSecure pool reaches constantly (number of threads - 1) max blocked threads  
    Assert.assertTrue("Exceeded number of blocked threads : " + maxItemsBlocked, maxItemsBlocked < n-2);
}
 

/**
 * Dumps all of the threads' current information to an output stream.
 *
 * @param out an output stream
 */
public void threadDump(OutputStream out) {
    final ThreadInfo[] threads = this.threads.dumpAllThreads(true, true);
    final PrintWriter writer = new PrintWriter(out, true);

    for (int ti = threads.length - 1; ti >= 0; ti--) {
        final ThreadInfo t = threads[ti];
        writer.printf("%s id=%d state=%s",
                t.getThreadName(),
                t.getThreadId(),
                t.getThreadState());
        final LockInfo lock = t.getLockInfo();
        if (lock != null && t.getThreadState() != State.BLOCKED) {
            writer.printf("\n    - waiting on <0x%08x> (a %s)",
                    lock.getIdentityHashCode(),
                    lock.getClassName());
            writer.printf("\n    - locked <0x%08x> (a %s)",
                    lock.getIdentityHashCode(),
                    lock.getClassName());
        } else if (lock != null && t.getThreadState() == State.BLOCKED) {
            writer.printf("\n    - waiting to lock <0x%08x> (a %s)",
                    lock.getIdentityHashCode(),
                    lock.getClassName());
        }

        if (t.isSuspended()) {
            writer.print(" (suspended)");
        }

        if (t.isInNative()) {
            writer.print(" (running in native)");
        }

        writer.println();
        if (t.getLockOwnerName() != null) {
            writer.printf("     owned by %s id=%d\n", t.getLockOwnerName(), t.getLockOwnerId());
        }

        final StackTraceElement[] elements = t.getStackTrace();
        final MonitorInfo[] monitors = t.getLockedMonitors();

        for (int i = 0; i < elements.length; i++) {
            final StackTraceElement element = elements[i];
            writer.printf("    at %s\n", element);
            for (int j = 1; j < monitors.length; j++) {
                final MonitorInfo monitor = monitors[j];
                if (monitor.getLockedStackDepth() == i) {
                    writer.printf("      - locked %s\n", monitor);
                }
            }
        }
        writer.println();

        final LockInfo[] locks = t.getLockedSynchronizers();
        if (locks.length > 0) {
            writer.printf("    Locked synchronizers: count = %d\n", locks.length);
            for (LockInfo l : locks) {
                writer.printf("      - %s\n", l);
            }
            writer.println();
        }
    }

    writer.println();
    writer.flush();
}
 

@Override
public void run() {
	try {
		while (runLogLoop) {
			try {
				final EventLogManager eventLogManager = EventLogManager.getInstance();
				// Code inspiré de http://knight76.blogspot.fr/2009/05/how-to-get-java-cpu-usage-jvm-instance.html et http://www.docjar.com/html/api/sun/tools/jconsole/SummaryTab$Result.java.html
				final SystemEventLog systemEventLog = eventLogManager.addEventLog(SystemEventLog.class);
				final OperatingSystemMXBean osMXBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
				final long processCpuTime = osMXBean.getProcessCpuTime();
				final RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();
				final long uptime = runtimeMXBean.getUptime();
				final int availableProcessors = osMXBean.getAvailableProcessors();
				final MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
				systemEventLog.setHeapMemoryUsed(memoryMXBean.getHeapMemoryUsage().getUsed());
				systemEventLog.setNonHeapMemoryUsed(memoryMXBean.getNonHeapMemoryUsage().getUsed());
				final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
				systemEventLog.setThreadCount(threadMXBean.getThreadCount());
				systemEventLog.setPeakThreadCount(threadMXBean.getPeakThreadCount());

				// Compute the cpuUsage
				if (prevUptime > 0L && uptime > prevUptime) {
					// elapsedCpu is in ns and elapsedTime is in ms.
					final long elapsedCpu = processCpuTime - prevProcessCpuTime;
					final long elapsedTime = uptime - prevUptime;
					// cpuUsage could go higher than 100% because elapsedTime
					// and elapsedCpu are not fetched simultaneously. Limit to
					// 99% to avoid Plotter showing a scale from 0% to 200%.
					systemEventLog.setCpuUsage(Math.min(100F, elapsedCpu / (elapsedTime * 10000F * availableProcessors))); // elapsedCpu / (elapsedTime * 1000F * 1000F * availableProcessors)) * 100 => pour l'avoir en %
				}
				systemEventLog.setUptime(uptime);
				systemEventLog.setProcessCpuTime(processCpuTime);
				systemEventLog.setAvailableProcessors(availableProcessors);

				// We now log all threads in RUNNABLE or BLOCKED state
				final ThreadInfo[] allThreads = threadMXBean.dumpAllThreads(false, false);
				final List<SystemEventLog.Thread> loggedThreads = new LinkedList<SystemEventLog.Thread>();
				for (final ThreadInfo threadInfo : allThreads) {
					if (threadInfo != null) {	// It seems that sometime (with JRockit) threadInfo is null
						final State threadState = threadInfo.getThreadState();
						if ((threadState == State.BLOCKED || threadState == State.RUNNABLE) && PatternUtils.matches(threadInfo.getThreadName(), threadNameIncludes, threadNameExcludes)) {
							final long threadId = threadInfo.getThreadId();
							loggedThreads.add(new SystemEventLog.Thread(threadInfo, threadMXBean.getThreadUserTime(threadId), threadMXBean.getThreadCpuTime(threadId)));
						}
					}
				}
				systemEventLog.setBlockedOrRunningThreads(loggedThreads.toArray(new SystemEventLog.Thread[loggedThreads.size()]));

				eventLogManager.fire(systemEventLog);
				SystemEventLogger.this.prevUptime = uptime;
				SystemEventLogger.this.prevProcessCpuTime = processCpuTime;
				Thread.sleep(cpuComputationDeltaMillis);
			} catch (final InterruptedException e) {
				throw new RuntimeException(e);
			}
		}
	} finally {
		stop();
	}
}
 

@Override
public void run() {
	LOGGER.info(String.format("Monitoring cache update using thread %s; considers .lock age? %s",
			Thread.currentThread().getId(),
			maximumAge != Long.MIN_VALUE));
	
	Map<Thread, StackTraceElement[]> stacks = Thread.getAllStackTraces();
	
	Thread target = null;
	
	/*
	 * try to find the 
	 */
	if (TimerTaskCacheScheduler.this.lastSchedulerThread != Long.MIN_VALUE) {
		for (Thread t : stacks.keySet()) {
			if (t.getId() == TimerTaskCacheScheduler.this.lastSchedulerThread) {
				target = t;
				break;
			}
		}		
	}
	
	if (target != null) {
		State state = target.getState();
		LOGGER.info("lastSchedulerThread status: " + state);
		LOGGER.info("lastSchedulerThread isalive: " + target.isAlive());
		LOGGER.info("lastSchedulerThread isinterrupted: " + target.isInterrupted());
		
		if (state != State.RUNNABLE && state != State.BLOCKED) {
			LOGGER.info(String.format("Updater thread's stack: %s", createStackTrace(target.getStackTrace())));
		}
	}
	else {
		LOGGER.warn("Could not find lastSchedulerThread in current stack traces");
	}
	
	boolean isLocked = true;
	
	isLocked = isCurrentyLocked();
	if (isLocked) {
		if (target != null && (target.getState() == Thread.State.TIMED_WAITING
				|| target.getState() == Thread.State.WAITING)) {
			LOGGER.warn("The cache update may have taken too long. trying to interrupt cache update.");
			target.interrupt();
		}
		
		try {
			if (this.maximumAge != Long.MIN_VALUE) {
				LOGGER.info("Resolving age of cache.lock file");
				File f = resolveCacheLockFile();
				if (System.currentTimeMillis() - f.lastModified() > this.maximumAge) {
					LOGGER.info("Trying to remove artifact cache.lock file due to its age");
					freeCacheUpdateLock();	
				}
				else {
					LOGGER.info("cache.lock to young, an update might be in progress.");
				}
			}
			else if (TimerTaskCacheScheduler.this.lastSchedulerThread != Long.MIN_VALUE) {
				/*
				 * only free if this CacheScheduler instance (singleton in an SOE instance)
				 * has already started a cache update. otherwise lastSchedulerThread has
				 * not been set yet
				 */
				LOGGER.info("freeing cache.lock");
				freeCacheUpdateLock();
			}
		}
		catch (IOException e) {
			LOGGER.warn(e.getMessage(), e);
		}
		
	}
	else {
		LOGGER.info("No stale cache.lock file found.");
	}
	
}
 

/**
 * Dumps all of the threads' current information to an output stream.
 *
 * @param out an output stream
 */
public void getThreadDump(OutputStream out) {
  final ThreadInfo[] threads = this.threads.dumpAllThreads(true, true);
  final PrintWriter writer = new PrintWriter(out, true);

  for (int ti = threads.length - 1; ti >= 0; ti--) {
    final ThreadInfo t = threads[ti];
    writer.printf("%s id=%d state=%s",
      t.getThreadName(),
      t.getThreadId(),
      t.getThreadState());

    final LockInfo lock = t.getLockInfo();
    if ((lock != null) && (t.getThreadState() != State.BLOCKED)) {
      writer.printf("\n    - waiting on <0x%08x> (a %s)",
        lock.getIdentityHashCode(),
        lock.getClassName());
      writer.printf("\n    - locked <0x%08x> (a %s)",
        lock.getIdentityHashCode(),
        lock.getClassName());
    } else if ((lock != null) && (t.getThreadState() == State.BLOCKED)) {
      writer.printf("\n    - waiting to lock <0x%08x> (a %s)",
        lock.getIdentityHashCode(),
        lock.getClassName());
    }

    if (t.isSuspended()) {
      writer.print(" (suspended)");
    }

    if (t.isInNative()) {
      writer.print(" (running in native)");
    }

    writer.println();
    if (t.getLockOwnerName() != null) {
      writer.printf("     owned by %s id=%d\n", t.getLockOwnerName(), t.getLockOwnerId());
    }

    final StackTraceElement[] elements = t.getStackTrace();
    final MonitorInfo[] monitors = t.getLockedMonitors();

    for (int i = 0; i < elements.length; i++) {
      final StackTraceElement element = elements[i];
      writer.printf("    at %s\n", element);
      for (int j = 1; j < monitors.length; j++) {
        final MonitorInfo monitor = monitors[j];
        if (monitor.getLockedStackDepth() == i) {
          writer.printf("      - locked %s\n", monitor);
        }
      }
    }
    writer.println();

    final LockInfo[] locks = t.getLockedSynchronizers();
    if (locks.length > 0) {
      writer.printf("    Locked synchronizers: count = %d\n", locks.length);
      for (LockInfo l : locks) {
        writer.printf("      - %s\n", l);
      }
      writer.println();
    }
  }

  writer.println();
  writer.flush();
}