问Java:检查非堆内存使用情况

EN

class MemoryInspectorThread extends Thread
{
private int samplingInterval;

private long initialMemoryHeap;
private long initialMemoryNonHeap;
private long maxMemoryHeap;
private long maxMemoryNonHeap;

private boolean kill=false;

void kill()
{
    kill=true;
}

long getMaxNewMemoryHeap()
{
    return (maxMemoryHeap-initialMemoryHeap)/1024;
}

long getMaxNewMemoryNonHeap()
{
    return (maxMemoryNonHeap-initialMemoryNonHeap)/1024;
}

MemoryInspectorThread(int samplingInterval)
{
    this.samplingInterval=samplingInterval;

    try
    {
        sleep(1000);
    } catch (InterruptedException e)
    {
        e.printStackTrace();
    }

    MemoryMXBean memoryMXBean=ManagementFactory.getMemoryMXBean();

    System.gc(); System.gc(); System.gc(); System.gc();
    System.gc(); System.gc(); System.gc(); System.gc();
    System.gc(); System.gc(); System.gc(); System.gc();
    System.gc(); System.gc(); System.gc(); System.gc();

    initialMemoryHeap=memoryMXBean.getHeapMemoryUsage().getUsed();
    initialMemoryNonHeap=memoryMXBean.getNonHeapMemoryUsage().getUsed();
}
@Override
public void run()
{
    MemoryMXBean memoryMXBean=ManagementFactory.getMemoryMXBean();

    while (!kill)
    {   
        long freeMemoryHeap=memoryMXBean.getHeapMemoryUsage().getUsed();
        long freeMemoryNonHeap=memoryMXBean.getNonHeapMemoryUsage().getUsed();

        if (freeMemoryHeap > maxMemoryHeap)
        {
            maxMemoryHeap=freeMemoryHeap;
        }

        if (freeMemoryNonHeap > maxMemoryNonHeap)
        {
            maxMemoryNonHeap=freeMemoryNonHeap;
        }

        try
        {
            sleep(samplingInterval);
        } catch (InterruptedException e)
        {
            e.printStackTrace();
        }
    }
}
}