RingBuffer

java.lang.Object
- one.nio.os.perf.RingBuffer

All Implemented Interfaces:: java.io.Closeable, java.lang.AutoCloseable

class RingBuffer
extends java.lang.Object
implements java.io.Closeable

Field Summary

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

Constructor Summary

Constructors
Constructor Description

RingBuffer(int fd, int pages, int sampleType)

Method Summary

All Methods Instance Methods Concrete Methods
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 Detail

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 Detail

RingBuffer

RingBuffer(int fd,
           int pages,
           int sampleType)
    throws java.io.IOException

Throws:: java.io.IOException

Method Detail

close
```
public void close()
```
Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

nextSample
```
PerfSample nextSample()
```

readSample

private PerfSample readSample(long offset)

hasOption

private boolean hasOption(int option)

readLong

private long readLong(long offset)