org.eclipse.smila.management.performance

Interface PerformanceCounterFormula

All Known Implementing Classes:

AverageFormula, AverageTimerFormula, RateFormula, SimpleCountFormula

public interface PerformanceCounterFormula

Counter value calculation formula interface.

Field Summary

Fields

Modifier and Type	Field and Description
static PerformanceCounterFormula	AVERAGE_FORMULA Average count formula calculates how many items are processed, on average, during an operation.
static PerformanceCounterFormula	AVERAGE_TIMER_FORMULA Average timer formulla calculates the time (in seconds) it takes, on average, to complete a process or operation.
static PerformanceCounterFormula	RATE_FORMULA Rate formula calculates (Xn - X0)/(Tn - T0), where Xi is a counter sample and Ti is the time that the corresponding sample was taken.
static PerformanceCounterFormula	SIMPLE_COUNT_FORMULA Simple items count formula returning the counter raw value.

Method Summary

Methods

Modifier and Type	Method and Description
double	calculateValue(PerformanceSample sample1, PerformanceSample sample2) Calculates next counter value by two samples.

Field Detail

SIMPLE_COUNT_FORMULA

static final PerformanceCounterFormula SIMPLE_COUNT_FORMULA

Simple items count formula returning the counter raw value.

AVERAGE_FORMULA

static final PerformanceCounterFormula AVERAGE_FORMULA

Average count formula calculates how many items are processed, on average, during an operation. The formula is (Xn - X0)/(Bn - B0) where Xi is a counter sample and the Bi is the corresponding base value (number of counter changes).

RATE_FORMULA

static final PerformanceCounterFormula RATE_FORMULA

Rate formula calculates (Xn - X0)/(Tn - T0), where Xi is a counter sample and Ti is the time that the corresponding sample was taken. The result is the average usage per second.

AVERAGE_TIMER_FORMULA

static final PerformanceCounterFormula AVERAGE_TIMER_FORMULA

Average timer formulla calculates the time (in seconds) it takes, on average, to complete a process or operation. The formula is (Tn - T0)/(Bn - B0) where Bi is base value and the Ti is corresponding timestamp.

Method Detail

calculateValue

double calculateValue(PerformanceSample sample1,
                    PerformanceSample sample2)

Calculates next counter value by two samples.

Parameters:

sample1 - sample1

sample2 - sample2

Returns:

next counter value