org.apache.calcite.util.trace

Class CalciteTimingTracer

java.lang.Object

org.apache.calcite.util.trace.CalciteTimingTracer

public class CalciteTimingTracer
extends Object

CalciteTimingTracer provides a mechanism for tracing the timing of a call sequence at nanosecond resolution.

Field Summary

Fields

Modifier and Type	Field and Description
private static DecimalFormat	DECIMAL_FORMAT
private long	lastNanoTime
private org.slf4j.Logger	logger

Constructor Summary

Constructors

Constructor and Description
CalciteTimingTracer(org.slf4j.Logger logger, String startEvent) Creates a new timing tracer, publishing an initial event (at elapsed time 0).

Method Summary

Modifier and Type	Method and Description
void	traceTime(String event) Publishes an event with the time elapsed since the previous event.

Methods inherited from class java.lang.Object

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

Field Detail

DECIMAL_FORMAT

private static final DecimalFormat DECIMAL_FORMAT

logger

private final org.slf4j.Logger logger

lastNanoTime

private long lastNanoTime

Constructor Detail

CalciteTimingTracer

public CalciteTimingTracer(org.slf4j.Logger logger,
                           String startEvent)

Creates a new timing tracer, publishing an initial event (at elapsed time 0).

Parameters:

logger - logger on which to log timing events; level FINE will be used

startEvent - event to trace as start of timing

Method Detail

traceTime

public void traceTime(String event)

Publishes an event with the time elapsed since the previous event.

Parameters:

event - event to trace