org.neo4j.io.pagecache.tracing.cursor

Interface PageCursorCounters

All Known Subinterfaces:

PageCursorTracer

All Known Implementing Classes:

DefaultPageCursorTracer

public interface PageCursorCounters

Expose information from page cache about particular page cursor events. Exposed counters are relevant only for particular cursor and do not represent global page cache wide picture.

See Also:

PageCursorCounters, PageCursorTracer

Method Summary

Modifier and Type	Method and Description
long	bytesRead()
long	bytesWritten()
long	evictionExceptions()
long	evictions()
long	faults()
long	flushes()
long	hits()
long	pins()
long	unpins()

Method Detail

faults

long faults()

Returns:

The number of page faults observed thus far.

pins

long pins()

Returns:

The number of page pins observed thus far.

unpins

long unpins()

Returns:

The number of page unpins observed thus far.

hits

long hits()

Returns:

The number of page hits observed so far.

bytesRead

long bytesRead()

Returns:

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

evictions

long evictions()

Returns:

The number of page evictions observed thus far.

evictionExceptions

long evictionExceptions()

Returns:

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

bytesWritten

long bytesWritten()

Returns:

The sum total of bytes written through flushes thus far.

flushes

long flushes()

Returns:

The number of page flushes observed thus far.