Package one.nio.os.perf

Class RingBuffer

java.lang.Object

one.nio.os.perf.RingBuffer

All Implemented Interfaces:

Closeable, AutoCloseable

class RingBuffer
extends Object
implements Closeable

Field Summary

Fields

Modifier and Type	Field	Description
private final long	address
private static final int	HEAD_OFFSET
private final long	mask
private static final int	PAGE_SIZE
private static final int	PERF_RECORD_SAMPLE
private final int	sampleType
private static final int	TAIL_OFFSET

Constructor Summary

Constructors

Constructor	Description
RingBuffer(int fd, int pages, int sampleType)

Method Summary

Modifier and Type	Method	Description
void	close()
private boolean	hasOption(int option)
(package private) PerfSample	nextSample()
private long	readLong(long offset)
private PerfSample	readSample(long offset)

Methods inherited from class java.lang.Object

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

Field Details

PAGE_SIZE

private static final int PAGE_SIZE

HEAD_OFFSET

private static final int HEAD_OFFSET

See Also:

• Constant Field Values

TAIL_OFFSET

private static final int TAIL_OFFSET

See Also:

• Constant Field Values

PERF_RECORD_SAMPLE

private static final int PERF_RECORD_SAMPLE

See Also:

• Constant Field Values

address

private final long address

mask

private final long mask

sampleType

private final int sampleType

Constructor Details

RingBuffer

RingBuffer(int fd,
 int pages,
 int sampleType)
    throws IOException

Throws:

IOException

Method Details

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

nextSample

PerfSample nextSample()

readSample

private PerfSample readSample(long offset)

hasOption

private boolean hasOption(int option)

readLong

private long readLong(long offset)