/// <summary>
/// Calculates a <see cref="DateTime"/> object by subtracting the
/// supplied <see cref="CleanupFrequency"/>'s time from the current time.
/// Used to determine when files should be cleaned up.
/// <br/><br/>
/// Throws an <see cref="Exception"/> if the CleanupFrequency is not
/// valid (because <see cref="CleanupPeriod.Copies"/> is selected, or
/// some other invalid value was supplied.)
/// </summary>
/// <param name="frequency">frequency to calculate from</param>
/// <returns>
/// The date/time that was exactly one <paramref name="frequency"/>
/// period before the current date/time.
/// </returns>
/// <exception cref="Exception"></exception>
public static DateTime TimeAgo(CleanupFrequency frequency)
{
TimeSpan span = TimeSpan.FromSeconds(0);
switch (frequency.Period)
{
case CleanupPeriod.Minutes:
span = TimeSpan.FromMinutes(frequency.Amount);
break;
case CleanupPeriod.Hours:
span = TimeSpan.FromHours(frequency.Amount);
break;
case CleanupPeriod.Days:
span = TimeSpan.FromHours(frequency.Amount);
break;
case CleanupPeriod.Weeks:
span = TimeSpan.FromHours(frequency.Amount);
break;
default:
throw new Exception("Can't get TimeAgo - Invalid CleanupPeriod - could be CleanupPeriod.Copies, or an invalid value");
}
return(DateTime.Now.Subtract(span));
}
/// <summary>
/// Convert a <see cref="CleanupFrequency"/> object to it's period value
/// in milliseconds.
/// <br/><br/>
/// Throws an <see cref="ArgumentException"/> if the cleanup period
/// is <see cref="CleanupPeriod.Copies"/>
/// </summary>
/// <param name="frequency">cleanup frequency to convert</param>
/// <returns>the frequency's period in milliseconds.</returns>
/// <exception cref="ArgumentException"></exception>
public static double ToMilliseconds(CleanupFrequency frequency)
{
if (frequency.Period == CleanupPeriod.Copies)
{
throw new ArgumentException("frequency period is CleanupPeriod.Copies, cannot convert copies to seconds.");
}
return(frequency.Amount * Multiplier(frequency.Period));
}
/// <summary>
/// Create a new BackupDataCleaner with specified params
/// </summary>
/// <param name="server">The server that is currently being processed.</param>
/// <param name="backups">The list of backups that currently exist for that server.</param>
public BackupDataCleaner(Server server, List <Backup> backups)
{
this.serverId = server.Id;
this.frequency = server.BackupSettings.CleanupSchedule;
this.backups = backups;
}