public T Get <T>(string key, long secondsToLive, Func <T> command)
{
if (_clientCacheProvider == null)
{
throw new Exception("DataCacheProvider is not set. Run DataCacheConfig.Initialize in Application_Start()");
}
DateTime entryDate;
DateTime serverDate;
long fetchedSecondsToLive;
T result;
// Try to get the data
if (_clientCacheProvider.TryGet <T>(key, out entryDate, out serverDate, out fetchedSecondsToLive, out result))
{
// Looks like we have data!
// If the data is expired, but we got it back from the server, the Purge process hasn't picked up on it yet.
// Let's go ahead and return what we have, but silently refetch the data in the background.
if (entryDate.AddSeconds(secondsToLive) < serverDate)
{
// If it'S REALLY old, and for some reason our Purge didn't pick up on this, run it again.
if (entryDate.AddSeconds(secondsToLive * 5) >= serverDate)
{
Task.Run(() =>
{
_clientCacheProvider.Put <T>(key, secondsToLive, command());
});
}
else
{
result = default(T);
}
}
}
// If we didn't get any data back
if (result == null)
{
result = command();
_clientCacheProvider.Put <T>(key, secondsToLive, result);
}
return(result);
}