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

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

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