public void FailureRateToMTBFString(double failureRate, TestFlightUtil.MTBFUnits units, bool shortForm,
int maximum, out string output)
{
if (sb == null)
{
sb = new StringBuilder(256);
}
sb.Length = 0;
var currentUnit = (int)TestFlightUtil.MTBFUnits.SECONDS;
var mtbf = FailureRateToMTBF(failureRate, (TestFlightUtil.MTBFUnits)currentUnit);
while (mtbf > maximum)
{
currentUnit++;
mtbf = FailureRateToMTBF(failureRate, (TestFlightUtil.MTBFUnits)currentUnit);
if ((TestFlightUtil.MTBFUnits)currentUnit == TestFlightUtil.MTBFUnits.INVALID)
{
break;
}
}
if (shortForm)
{
output = sb.AppendFormat("{0:F2}{1}", mtbf,
UnitStringForMTBFUnitShort((TestFlightUtil.MTBFUnits)currentUnit)).ToString();
}
else
{
output = sb.AppendFormat("{0:F2}{1}", mtbf,
UnitStringForMTBFUnit((TestFlightUtil.MTBFUnits)currentUnit)).ToString();
}
}
// Simply converts the failure rate to a MTBF number, without any string formatting
public double FailureRateToMTBF(double failureRate, TestFlightUtil.MTBFUnits units)
{
failureRate = Math.Max(failureRate, TestFlightUtil.MIN_FAILURE_RATE);
double mtbfSeconds = 1.0f / failureRate;
switch (units)
{
case TestFlightUtil.MTBFUnits.SECONDS:
return(mtbfSeconds);
case TestFlightUtil.MTBFUnits.MINUTES:
return(mtbfSeconds / 60);
case TestFlightUtil.MTBFUnits.HOURS:
return(mtbfSeconds / 60 / 60);
case TestFlightUtil.MTBFUnits.DAYS:
return(mtbfSeconds / 60 / 60 / 24);
case TestFlightUtil.MTBFUnits.YEARS:
return(mtbfSeconds / 60 / 60 / 24 / 365);
default:
return(mtbfSeconds);
}
}
internal static string UnitStringForMTBFUnitShort(TestFlightUtil.MTBFUnits units)
{
switch (units)
{
case TestFlightUtil.MTBFUnits.SECONDS:
return("s");
case TestFlightUtil.MTBFUnits.MINUTES:
return("m");
case TestFlightUtil.MTBFUnits.HOURS:
return("h");
case TestFlightUtil.MTBFUnits.DAYS:
return("d");
case TestFlightUtil.MTBFUnits.YEARS:
return("y");
default:
return("-");
}
}
internal static string UnitStringForMTBFUnit(TestFlightUtil.MTBFUnits units)
{
switch (units)
{
case TestFlightUtil.MTBFUnits.SECONDS:
return("seconds");
case TestFlightUtil.MTBFUnits.MINUTES:
return("minutes");
case TestFlightUtil.MTBFUnits.HOURS:
return("hours");
case TestFlightUtil.MTBFUnits.DAYS:
return("days");
case TestFlightUtil.MTBFUnits.YEARS:
return("years");
default:
return("invalid");
}
}
public string FailureRateToMTBFString(double failureRate, TestFlightUtil.MTBFUnits units, bool shortForm, int maximum)
{
var currentUnit = (int)TestFlightUtil.MTBFUnits.SECONDS;
var mtbf = FailureRateToMTBF(failureRate, (TestFlightUtil.MTBFUnits)currentUnit);
while (mtbf > maximum)
{
currentUnit++;
mtbf = FailureRateToMTBF(failureRate, (TestFlightUtil.MTBFUnits)currentUnit);
if ((TestFlightUtil.MTBFUnits)currentUnit == TestFlightUtil.MTBFUnits.INVALID)
{
break;
}
}
if (shortForm)
{
return(string.Format("{0:F2}{1}", mtbf, UnitStringForMTBFUnit((TestFlightUtil.MTBFUnits)currentUnit)[0]));
}
else
{
return(string.Format("{0:F2} {1}", mtbf, UnitStringForMTBFUnit((TestFlightUtil.MTBFUnits)currentUnit)));
}
}
// Short version of MTBFString uses a single letter to denote (s)econds, (m)inutes, (h)ours, (d)ays, (y)ears
// The returned string will be of the format "12.00s" or "0.20d"
public String FailureRateToMTBFString(double failureRate, TestFlightUtil.MTBFUnits units, bool shortForm)
{
return(FailureRateToMTBFString(failureRate, units, shortForm, int.MaxValue));
}
public String FailureRateToMTBFString(double failureRate, TestFlightUtil.MTBFUnits units, int maximum)
{
return(FailureRateToMTBFString(failureRate, units, false, maximum));
}
// simply converts the failure rate into a MTBF string. Convenience method
// Returned string will be of the format "123 units"
// units should be one of:
// seconds, hours, days, years,
public String FailureRateToMTBFString(double failureRate, TestFlightUtil.MTBFUnits units)
{
return(FailureRateToMTBFString(failureRate, units, false, int.MaxValue));
}
// Simply converts the failure rate to a MTBF number, without any string formatting
public double FailureRateToMTBF(double failureRate, TestFlightUtil.MTBFUnits units)
{
return(TestFlightUtil.FailureRateToMTBF(failureRate, units));
}
public void FailureRateToMTBFString(double failureRate, TestFlightUtil.MTBFUnits units, bool shortForm,
int maximum, out string output)
{
TestFlightUtil.FailureRateToMTBFString(failureRate, units, shortForm, maximum, out output);
}
public string FailureRateToMTBFString(double failureRate, TestFlightUtil.MTBFUnits units, bool shortForm, int maximum)
{
return(TestFlightUtil.FailureRateToMTBFString(failureRate, units, shortForm, maximum));
}
