public ProviderDataTypeItem <IEnumerable> LoadDataTypeFromSource(string key, DistributedDataType dataType)
{
IEnumerable value = null;
ProviderDataTypeItem <IEnumerable> dataTypeItem = null;
switch (dataType)
{
case DistributedDataType.List:
value = new List <object>()
{
LoadFromDataSource(key)
};
dataTypeItem = new ProviderDataTypeItem <IEnumerable>(value);
break;
case DistributedDataType.Dictionary:
value = new Dictionary <string, object>()
{
{ key, LoadFromDataSource(key) }
};
dataTypeItem = new ProviderDataTypeItem <IEnumerable>(value);
break;
case DistributedDataType.Counter:
dataTypeItem = new ProviderDataTypeItem <IEnumerable>(1000);
break;
}
return(dataTypeItem);
}
/// <summary>
/// Responsible for loading data structures from the external data source.
/// </summary>
/// <param name="key">key to fetch from data source</param>
/// <param name="dataType">type of data structure received</param>
/// <returns>Data structure contained in ProviderCacheItem which can be enumerated</returns>
public ProviderDataTypeItem <IEnumerable> LoadDataTypeFromSource(string key, DistributedDataType dataType)
{
// initialize ProviderDataTypeItem to return
ProviderDataTypeItem <IEnumerable> providerItem = null;
// create a switch to handle different Data Structures
switch (dataType)
{
// incase of counter, the value will be a long data type
case DistributedDataType.Counter:
providerItem = new ProviderDataTypeItem <IEnumerable>(sqlDatasource.GetCustomerCountByCompanyName(key));
break;
// incase of all other data types, the result must be enumerable
case DistributedDataType.Dictionary:
providerItem = new ProviderDataTypeItem <IEnumerable>(sqlDatasource.LoadCustomersByCity(key));
break;
case DistributedDataType.List:
providerItem = new ProviderDataTypeItem <IEnumerable>(sqlDatasource.LoadCustomersFromCountry(key));
break;
case DistributedDataType.Queue:
providerItem = new ProviderDataTypeItem <IEnumerable>(sqlDatasource.LoadCustomersByOrder(key));
break;
case DistributedDataType.Set:
// only primitive types can be used for HashSet
providerItem = new ProviderDataTypeItem <IEnumerable>(sqlDatasource.LoadOrderIDsByCustomer(key));
break;
}
return(providerItem);
}
public void MakeStoreItem(string key, ProviderDataTypeItem <object> providerItem)
{
Key = key;
ExpirationType = providerItem.Expiration.Type;
TimeToLive = providerItem.Expiration.ExpireAfter;
ItemPriority = providerItem.ItemPriority;
Group = providerItem.Group;
}
