/// <summary>
/// Check validity of entity cache
/// </summary>
/// <param name="entityName"></param>
/// <returns></returns>
public static bool IsValid(string teamUrl, string entityName, DateTime lastModifiedDt)
{
// entity timestamp of now will force refresh on cache
DateTime cacheTimestamp = DateTime.Now;
bool isValid = false;
if (isDisabled)
{
return(false);
}
try
{
// get entity timestamp
if (EntityTimestamps.Count > 0)
{
// do we have the cached team
if (EntityTimestamps.ContainsKey(teamUrl))
{
// is the entity for the team cached
if (EntityTimestamps[teamUrl].ContainsKey(entityName))
{
// get the last fetched time
cacheTimestamp = EntityTimestamps[teamUrl][entityName];
// check cache timestamp against last modified on list
if (DateTime.Compare(lastModifiedDt, cacheTimestamp) <= 0)
{
isValid = true;
}
}
}
}
}
catch (Exception ex)
{
throw new Exception(string.Format("Error: teamUrl: {0}; entity: {1}", teamUrl, entityName), ex.InnerException);
}
return(isValid);
}
public static void UpdateCache(string teamUrl, string entityName, List <T> entities, DateTime lastModifiedDt)
{
// do we have cached teams?
if (Entities.ContainsKey(teamUrl))
{
// do we have cached entities
if (Entities[teamUrl].ContainsKey(entityName))
{
// replace cached entities
Entities[teamUrl][entityName] = entities;
// replace timestamps
EntityTimestamps[teamUrl][entityName] = lastModifiedDt;
}
else
{
// add the entity to the existing team
Entities[teamUrl].Add(entityName, entities);
// add the expiration to the team/entity
EntityTimestamps[teamUrl].Add(entityName, lastModifiedDt);
}
}
else
{
// create a new entity dict
Dictionary <string, List <T> > newEntities = new Dictionary <string, List <T> >();
// add the entity name and the entities
newEntities.Add(entityName, entities);
// add the entity to the team
Entities.Add(teamUrl, newEntities);
// create a new timestamp
Dictionary <string, DateTime> newExpiration = new Dictionary <string, DateTime>();
// add the entity list timestamp
newExpiration.Add(entityName, lastModifiedDt);
// add the entity timestamp to the team
EntityTimestamps.Add(teamUrl, newExpiration);
}
}
public static void FlushCache()
{
EntityTimestamps.Clear();
Entities.Clear();
}
