DefaultPageCacheTracer (Neo4j

java.lang.Object
- org.neo4j.io.pagecache.tracing.DefaultPageCacheTracer

All Implemented Interfaces:

PageCacheCounters, PageCacheTracer
```
public class DefaultPageCacheTracer
extends Object
implements PageCacheTracer
```
The default PageCacheTracer implementation, that just increments counters.

Field Summary
- Fields inherited from interface org.neo4j.io.pagecache.tracing.PageCacheTracer
  NULL

Constructor Summary

Constructors
Constructor and Description

DefaultPageCacheTracer()

Constructors
Constructor and Description
`DefaultPageCacheTracer()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`MajorFlushEvent`	`beginCacheFlush()` The PageCache wants to flush all its bound pages.
`MajorFlushEvent`	`beginFileFlush(PageSwapper swapper)` A PagedFile wants to flush all its bound pages.
`EvictionRunEvent`	`beginPageEvictions(int pageCountToEvict)` A background eviction has begun.
`long`	`bytesRead()`
`void`	`bytesRead(long bytesRead)` Report number of bytes read
`long`	`bytesWritten()`
`void`	`bytesWritten(long bytesWritten)` Report number of bytes written
`long`	`evictionExceptions()`
`void`	`evictionExceptions(long evictionExceptions)` Report number of eviction exceptions
`long`	`evictions()`
`void`	`evictions(long evictions)` Report number of observed evictions
`long`	`faults()`
`void`	`faults(long faults)` Report number of observed faults
`long`	`filesMapped()`
`long`	`filesUnmapped()`
`long`	`flushes()`
`void`	`flushes(long flushes)` Report number of flushes
`double`	`hitRatio()`
`long`	`hits()`
`void`	`hits(long hits)` Report number of observer hits
`void`	`mappedFile(File file)` The given file has been mapped, where no existing mapping for that file existed.
`long`	`pins()`
`void`	`pins(long pins)` Report number of observed pins
`void`	`unmappedFile(File file)` The last reference to the given file has been unmapped.
`long`	`unpins()`
`void`	`unpins(long unpins)` Report number of observed unpins

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DefaultPageCacheTracer
```
public DefaultPageCacheTracer()
```
- Method Detail
  - mappedFile
```
public void mappedFile(File file)
```
    Description copied from interface: PageCacheTracer
    
    The given file has been mapped, where no existing mapping for that file existed.
    
    Specified by:
    
    mappedFile in interface PageCacheTracer
  - unmappedFile
```
public void unmappedFile(File file)
```
    Description copied from interface: PageCacheTracer
    
    The last reference to the given file has been unmapped.
    
    Specified by:
    
    unmappedFile in interface PageCacheTracer
  - beginPageEvictions
```
public EvictionRunEvent beginPageEvictions(int pageCountToEvict)
```
    Description copied from interface: PageCacheTracer
    
    A background eviction has begun. Called from the background eviction thread. This call will be paired with a following PageCacheTracer#endPageEviction call. The method returns an EvictionRunEvent to represent the event of this eviction run.
    
    Specified by:
    
    beginPageEvictions in interface PageCacheTracer
  - beginFileFlush
```
public MajorFlushEvent beginFileFlush(PageSwapper swapper)
```
    Description copied from interface: PageCacheTracer
    
    A PagedFile wants to flush all its bound pages.
    
    Specified by:
    
    beginFileFlush in interface PageCacheTracer
  - beginCacheFlush
```
public MajorFlushEvent beginCacheFlush()
```
    Description copied from interface: PageCacheTracer
    
    The PageCache wants to flush all its bound pages.
    
    Specified by:
    
    beginCacheFlush in interface PageCacheTracer
  - faults
```
public long faults()
```
    Specified by:
    
    faults in interface PageCacheCounters
    
    Returns:
    
    The number of page faults observed thus far.
  - evictions
```
public long evictions()
```
    Specified by:
    
    evictions in interface PageCacheCounters
    
    Returns:
    
    The number of page evictions observed thus far.
  - pins
```
public long pins()
```
    Specified by:
    
    pins in interface PageCacheCounters
    
    Returns:
    
    The number of page pins observed thus far.
  - unpins
```
public long unpins()
```
    Specified by:
    
    unpins in interface PageCacheCounters
    
    Returns:
    
    The number of page unpins observed thus far.
  - hits
```
public long hits()
```
    Specified by:
    
    hits in interface PageCacheCounters
    
    Returns:
    
    The number of page cache hits so far.
  - flushes
```
public long flushes()
```
    Specified by:
    
    flushes in interface PageCacheCounters
    
    Returns:
    
    The number of page flushes observed thus far.
  - bytesRead
```
public long bytesRead()
```
    Specified by:
    
    bytesRead in interface PageCacheCounters
    
    Returns:
    
    The sum total of bytes read in through page faults thus far.
  - bytesWritten
```
public long bytesWritten()
```
    Specified by:
    
    bytesWritten in interface PageCacheCounters
    
    Returns:
    
    The sum total of bytes written through flushes thus far.
  - filesMapped
```
public long filesMapped()
```
    Specified by:
    
    filesMapped in interface PageCacheCounters
    
    Returns:
    
    The number of file mappings observed thus far.
  - filesUnmapped
```
public long filesUnmapped()
```
    Specified by:
    
    filesUnmapped in interface PageCacheCounters
    
    Returns:
    
    The number of file unmappings observed thus far.
  - evictionExceptions
```
public long evictionExceptions()
```
    Specified by:
    
    evictionExceptions in interface PageCacheCounters
    
    Returns:
    
    The number of page evictions that have thrown exceptions thus far.
  - hitRatio
```
public double hitRatio()
```
    Specified by:
    
    hitRatio in interface PageCacheCounters
    
    Returns:
    
    The cache hit ratio observed thus far.
  - pins
```
public void pins(long pins)
```
    Description copied from interface: PageCacheTracer
    
    Report number of observed pins
    
    Specified by:
    
    pins in interface PageCacheTracer
    
    Parameters:
    
    pins - number of pins
  - unpins
```
public void unpins(long unpins)
```
    Description copied from interface: PageCacheTracer
    
    Report number of observed unpins
    
    Specified by:
    
    unpins in interface PageCacheTracer
    
    Parameters:
    
    unpins - number of unpins
  - hits
```
public void hits(long hits)
```
    Description copied from interface: PageCacheTracer
    
    Report number of observer hits
    
    Specified by:
    
    hits in interface PageCacheTracer
    
    Parameters:
    
    hits - number of hits
  - faults
```
public void faults(long faults)
```
    Description copied from interface: PageCacheTracer
    
    Report number of observed faults
    
    Specified by:
    
    faults in interface PageCacheTracer
    
    Parameters:
    
    faults - number of faults
  - bytesRead
```
public void bytesRead(long bytesRead)
```
    Description copied from interface: PageCacheTracer
    
    Report number of bytes read
    
    Specified by:
    
    bytesRead in interface PageCacheTracer
    
    Parameters:
    
    bytesRead - number of read bytes
  - evictions
```
public void evictions(long evictions)
```
    Description copied from interface: PageCacheTracer
    
    Report number of observed evictions
    
    Specified by:
    
    evictions in interface PageCacheTracer
    
    Parameters:
    
    evictions - number of evictions
  - evictionExceptions
```
public void evictionExceptions(long evictionExceptions)
```
    Description copied from interface: PageCacheTracer
    
    Report number of eviction exceptions
    
    Specified by:
    
    evictionExceptions in interface PageCacheTracer
    
    Parameters:
    
    evictionExceptions - number of eviction exceptions
  - bytesWritten
```
public void bytesWritten(long bytesWritten)
```
    Description copied from interface: PageCacheTracer
    
    Report number of bytes written
    
    Specified by:
    
    bytesWritten in interface PageCacheTracer
    
    Parameters:
    
    bytesWritten - number of written bytes
  - flushes
```
public void flushes(long flushes)
```
    Description copied from interface: PageCacheTracer
    
    Report number of flushes
    
    Specified by:
    
    flushes in interface PageCacheTracer
    
    Parameters:
    
    flushes - number of flushes

Class DefaultPageCacheTracer

Field Summary

Fields inherited from interface org.neo4j.io.pagecache.tracing.PageCacheTracer

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

DefaultPageCacheTracer

Method Detail

mappedFile

unmappedFile

beginPageEvictions

beginFileFlush

beginCacheFlush

faults

evictions

pins

unpins

hits

flushes

bytesRead

bytesWritten

filesMapped

filesUnmapped

evictionExceptions

hitRatio

pins

unpins

hits

faults

bytesRead

evictions

evictionExceptions

bytesWritten

flushes