org.neo4j.io.pagecache.tracing.cursor

Class DefaultPageCursorTracer

java.lang.Object

org.neo4j.io.pagecache.tracing.cursor.DefaultPageCursorTracer

All Implemented Interfaces:

PageCursorCounters, PageCursorTracer

public class DefaultPageCursorTracer
extends Object
implements PageCursorTracer

Field Summary

Fields inherited from interface org.neo4j.io.pagecache.tracing.cursor.PageCursorTracer

NULL

Constructor Summary

Constructors

Constructor and Description
DefaultPageCursorTracer()

Method Summary

Modifier and Type	Method and Description
PinEvent	beginPin(boolean writeLock, long filePageId, PageSwapper swapper)
long	bytesRead()
long	bytesWritten()
long	evictionExceptions()
long	evictions()
long	faults()
long	flushes()
long	hits()
void	init(PageCacheTracer pageCacheTracer) Initialize page cursor tracer with required context dependent values.
long	pins()
void	reportEvents() Report to global page cache tracer events observed by current page cursor tracer.
long	unpins()

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultPageCursorTracer

public DefaultPageCursorTracer()

Method Detail

init

public void init(PageCacheTracer pageCacheTracer)

Description copied from interface: PageCursorTracer

Initialize page cursor tracer with required context dependent values.

Specified by:

init in interface PageCursorTracer

Parameters:

pageCacheTracer - page cache tracer

reportEvents

public void reportEvents()

Description copied from interface: PageCursorTracer

Report to global page cache tracer events observed by current page cursor tracer. As soon as any event will be reported, page cursor tracer reset corresponding counters and completely forgets about it.

Specified by:

reportEvents in interface PageCursorTracer

faults

public long faults()

Specified by:

faults in interface PageCursorCounters

Returns:

The number of page faults observed thus far.

pins

public long pins()

Specified by:

pins in interface PageCursorCounters

Returns:

The number of page pins observed thus far.

unpins

public long unpins()

Specified by:

unpins in interface PageCursorCounters

Returns:

The number of page unpins observed thus far.

hits

public long hits()

Specified by:

hits in interface PageCursorCounters

Returns:

The number of page hits observed so far.

bytesRead

public long bytesRead()

Specified by:

bytesRead in interface PageCursorCounters

Returns:

The sum total of bytes read in through page faults thus far.

evictions

public long evictions()

Specified by:

evictions in interface PageCursorCounters

Returns:

The number of page evictions observed thus far.

evictionExceptions

public long evictionExceptions()

Specified by:

evictionExceptions in interface PageCursorCounters

Returns:

The number of page evictions that have thrown exceptions thus far.

bytesWritten

public long bytesWritten()

Specified by:

bytesWritten in interface PageCursorCounters

Returns:

The sum total of bytes written through flushes thus far.

flushes

public long flushes()

Specified by:

flushes in interface PageCursorCounters

Returns:

The number of page flushes observed thus far.

beginPin

public PinEvent beginPin(boolean writeLock,
                         long filePageId,
                         PageSwapper swapper)

Specified by:

beginPin in interface PageCursorTracer