Example usage for java.lang.management ManagementFactory getThreadMXBean

Introduction

In this page you can find the example usage for java.lang.management ManagementFactory getThreadMXBean.

Prototype

public static ThreadMXBean getThreadMXBean() 

Source Link

Document

Returns the managed bean for the thread system of the Java virtual machine.

Usage

From source file:Main.java

/**
 * Get a list of all thread info objects. Since there is always at least one
 * thread running, there is always at least one thread info object. This
 * method never returns a null or empty array.
 * /*from  w w  w  .  ja va 2  s .c  o  m*/
 * @return an array of thread infos
 */
public static ThreadInfo[] getAllThreadInfos() {
    final ThreadMXBean thbean = ManagementFactory.getThreadMXBean();
    final long[] ids = thbean.getAllThreadIds();

    // Get thread info with lock info, when available.
    ThreadInfo[] infos;
    if (!thbean.isObjectMonitorUsageSupported() || !thbean.isSynchronizerUsageSupported()) {
        infos = thbean.getThreadInfo(ids);
    } else {
        infos = thbean.getThreadInfo(ids, true, true);
    }

    // Clean nulls from array if threads have died.
    final ThreadInfo[] notNulls = new ThreadInfo[infos.length];
    int nNotNulls = 0;
    for (ThreadInfo info : infos) {
        if (info != null) {
            notNulls[nNotNulls++] = info;
        }
    }
    if (nNotNulls == infos.length)
        return infos; // Original had no nulls
    return java.util.Arrays.copyOf(notNulls, nNotNulls);
}

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From source file:com.github.jinahya.codec.BossVsEngineerTestCpuTimeDecode.java

private static long decodeLikeAnEngineer(final byte[] encoded) {
    final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    final long start = threadMXBean.getCurrentThreadCpuTime();
    new HexDecoder().decodeLikeAnEngineer(encoded);
    return threadMXBean.getCurrentThreadCpuTime() - start;
}

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From source file:com.github.jinahya.codec.BossVsEngineerTestCpuTimeEncode.java

private static long encodeLikeAnEngineer(final byte[] decoded) {
    final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    final long start = threadMXBean.getCurrentThreadCpuTime();
    new HexEncoder().encodeLikeAnEngineer(decoded);
    return threadMXBean.getCurrentThreadCpuTime() - start;
}

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From source file:com.thoughtworks.go.server.service.support.ThreadInformationProvider.java

@Override
public void appendInformation(InformationStringBuilder builder) {
    ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
    builder.addSection("Thread information");

    builder.append(String.format("Current: %s, Total: %s, Daemon: %s, Peak: %s\n",
            threadMXBean.getThreadCount(), threadMXBean.getTotalStartedThreadCount(),
            threadMXBean.getDaemonThreadCount(), threadMXBean.getPeakThreadCount()));
    long[] deadlockedThreads = threadMXBean.findDeadlockedThreads();
    if (deadlockedThreads != null && deadlockedThreads.length > 0) {
        builder.append(String.format("Found %s dead locked threads. Here is there information.\n",
                deadlockedThreads.length));
        for (long deadlockedThread : deadlockedThreads) {
            ThreadInfo threadInfo = threadMXBean.getThreadInfo(deadlockedThread);
            LockInfo lockInfo = threadInfo.getLockInfo();
            if (lockInfo != null) {
                builder.append(String.format("LockInfo: %s", lockInfo));
            } else {
                builder.append("This thread is not waiting for any locks\n");
            }/*from   www.j  av  a2 s . c  om*/
            builder.append(String.format("Monitor Info - Stack Frame where locks were taken.\n"));
            MonitorInfo[] lockedMonitors = threadInfo.getLockedMonitors();
            for (MonitorInfo lockedMonitor : lockedMonitors) {
                builder.append(String.format("Monitor for class '%s' taken at stack frame '%s'.",
                        lockedMonitor.getClassName(), lockedMonitor.getLockedStackFrame()));
            }
            builder.append("The stack trace of the deadlocked thread\n");
            builder.append(Arrays.toString(threadInfo.getStackTrace()));
        }
    }
    builder.addSubSection("All thread stacktraces");
    ThreadInfo[] threadInfos = threadMXBean.dumpAllThreads(true, true);
    for (ThreadInfo threadInfo : threadInfos) {
        builder.append(String.format("%s, %s, %s\n", threadInfo.getThreadId(), threadInfo.getThreadName(),
                threadInfo.getThreadState()));
        MonitorInfo[] lockedMonitors = threadInfo.getLockedMonitors();
        builder.append("Locked Monitors:\n");
        for (MonitorInfo lockedMonitor : lockedMonitors) {
            builder.append(String.format("%s at %s", lockedMonitor, lockedMonitor.getLockedStackFrame()));
        }
        LockInfo[] lockedSynchronizers = threadInfo.getLockedSynchronizers();
        builder.append("Locked Synchronizers:\n");
        for (LockInfo lockedSynchronizer : lockedSynchronizers) {
            builder.append(lockedSynchronizer);
        }
        builder.append("Stacktrace:\n  ");
        builder.append(StringUtils.join(threadInfo.getStackTrace(), "\n  "));
        builder.append("\n\n");
    }
}

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From source file:org.vbossica.springbox.metrics.ThreadDumpController.java

@Override
public void afterPropertiesSet() throws Exception {
    this.threadDump = new ThreadDump(ManagementFactory.getThreadMXBean());
}

---

From source file:Main.java

/**
 * //from w  w  w .  j  av  a  2  s  . c om
 */
public static ThreadInfo[] getStackTraces() {
    ThreadMXBean bean = ManagementFactory.getThreadMXBean();
    return bean.dumpAllThreads(true, true);
}

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From source file:DeadlockDetector.java

@Override
public void run() {
    boolean noDeadLocks = true;

    while (noDeadLocks) {
        try {/*from  ww  w .  j  a  va  2s  .  c o m*/
            ThreadMXBean bean = ManagementFactory.getThreadMXBean();
            long[] threadIds = bean.findDeadlockedThreads();

            if (threadIds != null) {
                System.out.println("Deadlock detected!");
                sb = new StringBuilder();
                noDeadLocks = false;

                ThreadInfo[] infos = bean.getThreadInfo(threadIds);
                sb.append("\nTHREAD LOCK INFO: \n");
                for (ThreadInfo threadInfo : infos) {
                    printThreadInfo(threadInfo);
                    LockInfo[] lockInfos = threadInfo.getLockedSynchronizers();
                    MonitorInfo[] monitorInfos = threadInfo.getLockedMonitors();

                    printLockInfo(lockInfos);
                    printMonitorInfo(threadInfo, monitorInfos);
                }

                sb.append("\nTHREAD DUMPS: \n");
                for (ThreadInfo ti : bean.dumpAllThreads(true, true)) {
                    printThreadInfo(ti);
                }
                System.out.println(sb.toString());
            }
            Thread.sleep(checkInterval);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

---

From source file:com.alibaba.dragoon.client.jmx.Threading.java

public Threading() {
    Threading = ManagementFactory.getThreadMXBean();
    OperatingSystem = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();
    Runtime = ManagementFactory.getRuntimeMXBean();

    try {//from  ww  w.ja va 2 s  .  c o m
        gc = new GC();

        // ?
        lastGCTime = gc.getFullGCCollectionTime() + gc.getYoungGCCollectionTime();
        lastCPUTime = getProcessCpuTime();
        lastGCUpTime = lastCPUUpTime = getUpTime();

    } catch (Exception e) {
        LOG.error(e.getMessage(), e);
    }
}

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From source file:org.talend.dataquality.statistics.datetime.PerformanceTest.java

@Test
@Ignore/*from  ww w . j av  a 2s.c om*/
public void testIsDate() throws IOException {

    final InputStream stream = SystemDateTimePatternManager.class.getResourceAsStream("DateSampleTable.txt");
    final List<String> lines = IOUtils.readLines(stream);

    SystemDateTimePatternManager.isDate("12/02/99");// init DateTimeFormatters

    final ThreadMXBean mxBean = ManagementFactory.getThreadMXBean();
    final long cpuBefore = mxBean.getCurrentThreadCpuTime();

    int count = 0;
    loop: for (int n = 0; n < REPLICATE; n++) {
        for (int i = 1; i < lines.size(); i++) {
            final String line = lines.get(i);
            if (!"".equals(line.trim())) {
                final String[] sampleLine = line.trim().split("\t");
                final String sample = sampleLine[0];
                CustomDateTimePatternManager.isDate(sample, Collections.emptyList());
                count++;
                if (count > 100000) {
                    break loop;
                }
            }
        }
    }

    final long cpuAfter = mxBean.getCurrentThreadCpuTime();

    final long difference = cpuAfter - cpuBefore;
    assertTrue("The method isDate() is slower than expected. Actual CPU time spent: " + difference,
            difference < 20e8);
}

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From source file:Main.java

public static Thread[] getAllThreads() {
    final ThreadGroup root = getRootThreadGroup();
    final ThreadMXBean thbean = ManagementFactory.getThreadMXBean();

    int nAlloc = thbean.getThreadCount();
    int n = 0;//  w ww . j  a va2 s  .com

    Thread[] threads;
    do {
        nAlloc *= 2;
        threads = new Thread[nAlloc];
        n = root.enumerate(threads, true);
    } while (n == nAlloc);

    return java.util.Arrays.copyOf(threads, n);
}

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