org.neo4j.io.pagecache.tracing.cursor

Interface PageCursorTracer

All Superinterfaces:

PageCursorCounters

All Known Implementing Classes:

DefaultPageCursorTracer

public interface PageCursorTracer
extends PageCursorCounters

Event tracer for page cursors. Performs event tracing related to particular page cursors and expose simple counters around them. Since events of each particular page cursor are part of whole page cache events, each particular page cursor tracer will eventually report them to global page cache counters/tracers.

See Also:

PageCursorTracer

Field Summary

Fields

Modifier and Type	Field and Description
static PageCursorTracer	NULL

Method Summary

Modifier and Type	Method and Description
PinEvent	beginPin(boolean writeLock, long filePageId, PageSwapper swapper)
void	init(PageCacheTracer tracer) Initialize page cursor tracer with required context dependent values.
void	reportEvents() Report to global page cache tracer events observed by current page cursor tracer.

Methods inherited from interface org.neo4j.io.pagecache.tracing.cursor.PageCursorCounters

bytesRead, bytesWritten, evictionExceptions, evictions, faults, flushes, hitRatio, hits, pins, unpins

Field Detail

NULL

static final PageCursorTracer NULL

Method Detail

beginPin

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

init

void init(PageCacheTracer tracer)

Initialize page cursor tracer with required context dependent values.

Parameters:

tracer - page cache tracer

reportEvents

void reportEvents()

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.