Java ThreadMXBean.getThreadCount方法代碼示例

import java.lang.management.ThreadMXBean; //導入方法依賴的package包/類
@Override
public String call() {
  Map<String, String> memoryMap = new HashMap<>();
  OperatingSystemMXBean osMxBean = ManagementFactory.getOperatingSystemMXBean();
  double cpu = osMxBean.getSystemLoadAverage();
  memoryMap.put("cpuLoad", String.format(doubleStringFormatter, round(cpu, doubleRoundPlaces)));

  ThreadMXBean threadmxBean = ManagementFactory.getThreadMXBean();
  int threadCount = threadmxBean.getThreadCount();
  memoryMap.put("cpuRunningThreads", String.valueOf(threadCount));

  MemoryMXBean memBean = ManagementFactory.getMemoryMXBean();
  MemoryUsage memHeapUsage = memBean.getHeapMemoryUsage();
  MemoryUsage nonHeapUsage = memBean.getNonHeapMemoryUsage();
  memoryMap.put("heapInit", String.valueOf(memHeapUsage.getInit()));
  memoryMap.put("heapMax", String.valueOf(memHeapUsage.getMax()));
  memoryMap.put("heapCommit", String.valueOf(memHeapUsage.getCommitted()));
  memoryMap.put("heapUsed", String.valueOf(memHeapUsage.getUsed()));
  memoryMap.put("nonHeapInit", String.valueOf(nonHeapUsage.getInit()));
  memoryMap.put("nonHeapMax", String.valueOf(nonHeapUsage.getMax()));
  memoryMap.put("nonHeapCommit", String.valueOf(nonHeapUsage.getCommitted()));
  memoryMap.put("nonHeapUsed", String.valueOf(nonHeapUsage.getUsed()));
  return memoryMap.toString();
}
 

import java.lang.management.ThreadMXBean; //導入方法依賴的package包/類
@Override
public void sense(final MetricRecorder.Context metricContext)
{
    ThreadMXBean mxBean = ManagementFactory.getThreadMXBean();

    int current = mxBean.getThreadCount();
    int peak = mxBean.getPeakThreadCount();

    if (peak > historicalPeak) {
        historicalPeak = peak;
    }

    metricContext.record(THREADS, current, Unit.NONE);
    metricContext.record(PERIODIC_PEAK_THREADS, peak, Unit.NONE);
    metricContext.record(PEAK_THREADS, historicalPeak, Unit.NONE);

    mxBean.resetPeakThreadCount();
}
 

import java.lang.management.ThreadMXBean; //導入方法依賴的package包/類
/**
 * @return a list of all threads started in the JVM.
 */
public List<Thread> getAllThreads() {

    final ThreadGroup root = getRootThreadGroup();
    final ThreadMXBean thbean = ManagementFactory.getThreadMXBean();
    // get the number of all live threads
    int nAlloc = thbean.getThreadCount();
    int n = 0;
    Thread[] threads;

    do {
        nAlloc *= 2; // increase the size since more threads may have been created
        threads = new Thread[nAlloc];
        n = root.enumerate(threads, true); // get all active threads from this thread group
    } while (n == nAlloc); // stop if all active threads are enumerated

    List<Thread> res = new ArrayList<Thread>();
    for (Thread th : threads) {
        res.add(th);
    }

    return res;
}
 

import java.lang.management.ThreadMXBean; //導入方法依賴的package包/類
@Override
public Object next() {
  if (!beforeFirst) {
    throw new IllegalStateException();
  }
  beforeFirst = false;
  final ThreadsInfo threadsInfo = new ThreadsInfo();

  final DrillbitEndpoint endpoint = context.getIdentity();
  threadsInfo.hostname = endpoint.getAddress();
  threadsInfo.user_port = endpoint.getUserPort();

  final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
  threadsInfo.total_threads = threadMXBean.getPeakThreadCount();
  threadsInfo.busy_threads = threadMXBean.getThreadCount();
  return threadsInfo;
}
 

import java.lang.management.ThreadMXBean; //導入方法依賴的package包/類
public static void main(String args[]) {

        // get top-level thread group
        ThreadGroup top = Thread.currentThread().getThreadGroup();
        ThreadGroup parent;
        do {
            parent = top.getParent();
            if (parent != null) top = parent;
        } while (parent != null);

        // get the thread count
        int activeCount = top.activeCount();

        Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces();

        ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
        int threadCount = threadBean.getThreadCount();
        long[] threadIds = threadBean.getAllThreadIds();

        System.out.println("ThreadGroup: " + activeCount + " active thread(s)");
        System.out.println("Thread: " + stackTraces.size() + " stack trace(s) returned");
        System.out.println("ThreadMXBean: " + threadCount + " live threads(s)");
        System.out.println("ThreadMXBean: " + threadIds.length + " thread Id(s)");

        // check results are consistent
        boolean failed = false;
        if (activeCount != stackTraces.size()) failed = true;
        if (activeCount != threadCount) failed = true;
        if (activeCount != threadIds.length) failed = true;

        if (failed) {
            throw new RuntimeException("inconsistent results");
        }
    }
 

import java.lang.management.ThreadMXBean; //導入方法依賴的package包/類
public static void main(String args[]) {

        // Bug id : JDK-8151797
        // Use a lambda expression so that call-site cleaner thread is started
        Runnable printLambda = () -> {System.out.println("Starting Test");};
        printLambda.run();

        // get top-level thread group
        ThreadGroup top = Thread.currentThread().getThreadGroup();
        ThreadGroup parent;
        do {
            parent = top.getParent();
            if (parent != null) top = parent;
        } while (parent != null);

        // get the thread count
        int activeCount = top.activeCount();

        Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces();

        ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
        int threadCount = threadBean.getThreadCount();
        long[] threadIds = threadBean.getAllThreadIds();

        System.out.println("ThreadGroup: " + activeCount + " active thread(s)");
        System.out.println("Thread: " + stackTraces.size() + " stack trace(s) returned");
        System.out.println("ThreadMXBean: " + threadCount + " live threads(s)");
        System.out.println("ThreadMXBean: " + threadIds.length + " thread Id(s)");

        // check results are consistent
        boolean failed = false;
        if (activeCount != stackTraces.size()) failed = true;
        if (activeCount != threadCount) failed = true;
        if (activeCount != threadIds.length) failed = true;

        if (failed) {
            throw new RuntimeException("inconsistent results");
        }
    }
 

import java.lang.management.ThreadMXBean; //導入方法依賴的package包/類
@Override
public int getThreadCount() {
  ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
  return threadMXBean.getThreadCount();
}