static DateTime GetPreviousDate(SettingAttribute setting, DateTime date)
{
switch (setting.Period)
{
case Period.Year:
return(date.AddYears(-setting.RemoveAfter));
case Period.Month:
return(date.AddMonths(-setting.RemoveAfter));
case Period.Day:
return(date.AddDays(-setting.RemoveAfter));
default:
return(date);
}
}
static DateTime GetExpireDate(SettingAttribute setting, DateTime date)
{
switch (setting.Period)
{
case Period.Year:
return(new DateTime(date.Year + 1, 1, 1));
case Period.Month:
return(new DateTime(date.Year, date.Month, 1).AddMonths(1));
case Period.Day:
return(date.Date.AddDays(1));
default:
return(DateTime.MaxValue);
}
}
static string GetName(SettingAttribute setting, DateTime date)
{
switch (setting.Period)
{
case Period.Year:
return(setting.Name + date.ToString("yyyy"));
case Period.Month:
return(setting.Name + date.ToString("yyyyMM"));
case Period.Day:
return(setting.Name + date.ToString("yyyyMMdd"));
default:
return(setting.Name);
}
}
T GetCloudObject <T>(SettingAttribute setting, bool autoCreate, Func <string, T> getReference, Action <T, SettingAttribute> createIfNotExists, Action <T> deleteIfExists)
{
if (setting.Period == Period.NoPeriod)
{
var @ref = getReference(setting.Name);
if (autoCreate)
{
createIfNotExists(@ref, setting);
}
return(@ref);
}
var key = typeof(T).FullName + "." + setting.Name;
if (_references.TryGetValue(key, out var tuple))
{
if (setting.Period == Period.NoPeriod || DateTime.UtcNow < tuple.Item1)
{
return((T)tuple.Item2);
}
}
var now = DateTime.UtcNow;
var objName = GetName(setting, now);
var obj = getReference(objName);
var expire = GetExpireDate(setting, now);
_references[key] = Tuple.Create(expire, (object)obj);
//maintain
createIfNotExists(obj, setting);
if (setting.RemoveAfter > 0)
{
var previous = GetPreviousDate(setting, now);
var objNameToDelete = GetName(setting, previous);
var objToDelete = getReference(objNameToDelete);
deleteIfExists(objToDelete);
}
return(obj);
}
public CloudQueue GetCloudQueue(SettingAttribute setting, bool autoCreate)
{
return(GetCloudObject(setting, autoCreate, Queue.GetQueueReference, (q, s) => q.CreateIfNotExists(), q => q.DeleteIfExists()));
}
public CloudTable GetCloudTable(SettingAttribute setting, bool autoCreate)
{
return(GetCloudObject(setting, autoCreate, Table.GetTableReference, (t, s) => t.CreateIfNotExists(), t => t.DeleteIfExists()));
}
public CloudTable <T> GetGenericCloudTable <T>(SettingAttribute setting, bool autoCreate) where T : class, ITableEntity, new()
{
return(GetCloudObject(setting, autoCreate, CreateCloudTable <T>, (t, s) => t.CloudTableContext.CreateIfNotExists(), t => t.CloudTableContext.DeleteIfExists()));
}
public CloudBlobContainer GetCloudBlobContainer(SettingAttribute setting, bool autoCreate)
{
return(GetCloudObject(setting, autoCreate, Blob.GetContainerReference, (b, s) => b.CreateIfNotExists(s.BlobAccessType), b => b.DeleteIfExists()));
}
