internal static TimeSpan GetTimeSinceOldestBackupInternal(
List <string> databaseNames,
Func <string, DateTime?> getLastBackup,
SystemTime systemTime = null)
{
var now = systemTime?.GetUtcNow() ?? SystemTime.UtcNow;
DateTime oldestBackup = now;
foreach (var databaseName in databaseNames)
{
var lastBackup = getLastBackup(databaseName);
if (lastBackup == null)
{
continue;
}
if (lastBackup < oldestBackup)
{
oldestBackup = lastBackup.Value;
}
}
if (now <= oldestBackup)
{
return(TimeSpan.Zero);
}
return(now - oldestBackup);
}
public void GivenNeverBackedUpDb_ReturnsTimespanMax()
{
var backupTimes = new DateTime?[]
{
_time.GetUtcNow().Date,
_time.GetUtcNow().Subtract(TimeSpan.FromDays(1)),
_time.GetUtcNow(),
DateTime.MinValue,
};
SetupDatabasesBackupTimes(backupTimes);
var result =
DatabaseOldestBackup.GetTimeSinceOldestBackupInternal(_backupDates.Keys.ToList(), GetLastBackupDate, _time);
Assert.True(result > SnmpValuesHelper.TimeSpanSnmpMax);
Assert.Equal(SnmpValuesHelper.TimeTicksMax, SnmpValuesHelper.TimeSpanToTimeTicks(result));
}