Class PerfCounter

java.lang.Object

one.nio.os.perf.PerfCounter

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

PerfCounterGlobal

public class PerfCounter
extends Object
implements Closeable

Field Summary

Fields

Modifier and Type	Field	Description
private final PerfEvent	event
(package private) int	fd
(package private) static final AtomicIntegerFieldUpdater<PerfCounter>	fdUpdater
protected final long	readFormat
private final RingBuffer	ringBuffer

Constructor Summary

Constructors

Constructor	Description
PerfCounter(PerfEvent event, RingBuffer ringBuffer, long readFormat, int fd)

Method Summary

Modifier and Type	Method	Description
void	attachBpf(int fd)
void	close()
void	disable()
void	enable()
final PerfEvent	event()
long	get()
protected long[]	getRawValue()
CounterValue	getValue()
boolean	hasReadFormat(int readFormat)
(package private) void	ioctl(int cmd, int arg)
protected long[]	newBuffer()
PerfSample	nextSample()
void	refresh(int count)
void	reset()
protected LocalValue	toValue(long[] raw)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

event

private final PerfEvent event

ringBuffer

private final RingBuffer ringBuffer

readFormat

protected final long readFormat

fd

volatile int fd

fdUpdater

static final AtomicIntegerFieldUpdater<PerfCounter> fdUpdater

Constructor Details

PerfCounter

PerfCounter(PerfEvent event,
 RingBuffer ringBuffer,
 long readFormat,
 int fd)

Method Details

event

public final PerfEvent event()

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

get

public long get()
         throws IOException

Throws:

IOException

getValue

public CounterValue getValue()
                      throws IOException

Throws:

IOException

getRawValue

protected long[] getRawValue()
                      throws IOException

Throws:

IOException

newBuffer

protected long[] newBuffer()

toValue

protected LocalValue toValue(long[] raw)

hasReadFormat

public boolean hasReadFormat(int readFormat)

nextSample

public PerfSample nextSample()

reset

public void reset()
           throws IOException

Throws:

IOException

attachBpf

public void attachBpf(int fd)
               throws IOException

Throws:

IOException

enable

public void enable()
            throws IOException

Throws:

IOException

disable

public void disable()
             throws IOException

Throws:

IOException

refresh

public void refresh(int count)
             throws IOException

Throws:

IOException

ioctl

void ioctl(int cmd,
 int arg)
    throws IOException

Throws:

IOException