private bool TryGetEducationOrganizationValueMaps(string context, out EducationOrganizationValueMaps identityValueMaps)
{
object educationOrganizationCacheAsObject;
string cacheKey = GetEducationOrganizationCacheKey(context);
if (!_cacheProvider.TryGetCachedObject(cacheKey, out educationOrganizationCacheAsObject))
{
// Make sure there is only one cache set being initialized at a time
lock (_identityValueMapsLock)
{
// Make sure that the entry still doesn't exist yet
if (!_cacheProvider.TryGetCachedObject(cacheKey, out educationOrganizationCacheAsObject))
{
var newValueMaps = new EducationOrganizationValueMaps();
//Put the initialization task on the cached object so that we know the initialization status by cache entry key
//Even if/when the cache provider storage changes context
newValueMaps.InitializationTask = InitializeEducationOrganizationValueMaps(newValueMaps, context);
//Initial Insert is for while async initialization is running.
_cacheProvider.Insert(cacheKey, newValueMaps, DateTime.MaxValue, TimeSpan.FromMinutes(5));
_cacheProvider.TryGetCachedObject(cacheKey, out educationOrganizationCacheAsObject);
}
}
}
identityValueMaps = educationOrganizationCacheAsObject as EducationOrganizationValueMaps;
if (identityValueMaps == null)
{
return(false);
}
if (_synchronousInitialization &&
(identityValueMaps.EducationOrganizationIdentifiersByEducationOrganizationId == null ||
identityValueMaps.EducationOrganizationIdentifiersByStateOrganizationId == null))
{
// Wait for the initialization task to complete
identityValueMaps.InitializationTask.WaitSafely();
//If initialization failed, return false.
if (identityValueMaps.EducationOrganizationIdentifiersByEducationOrganizationId == null ||
identityValueMaps.EducationOrganizationIdentifiersByStateOrganizationId == null)
{
return(false);
}
// With initialization complete, try again (using a single recursive call)
return(TryGetEducationOrganizationValueMaps(context, out identityValueMaps));
}
return(true);
}
private Task InitializeEducationOrganizationValueMaps(EducationOrganizationValueMaps entry, string context)
{
// In web application scenarios, copy pertinent context from HttpContext to CallContext
if (HttpContextStorageTransfer != null)
{
HttpContextStorageTransfer.TransferContext();
}
var task = InitializeEducationOrganizationValueMapsAsync(entry, context);
if (task.Status == TaskStatus.Created)
{
task.Start();
}
return(task);
}
private async Task InitializeEducationOrganizationValueMapsAsync(EducationOrganizationValueMaps entry, string context)
{
// Unhandled exceptions here will take down the ASP.NET process
try
{
// Start building the data
var educationOrganizationIdentifiersByStateOrganizationId =
new ConcurrentDictionary <string, EducationOrganizationIdentifiers>();
var educationOrganizationIdentifiersByEducationOrganizationId =
new ConcurrentDictionary <string, EducationOrganizationIdentifiers>();
Stopwatch stopwatch = null;
if (_logger.IsDebugEnabled)
{
stopwatch = new Stopwatch();
stopwatch.Start();
}
foreach (
var valueMap in
await
_educationOrganizationIdentifiersProvider.GetAllEducationOrganizationIdentifiers()
.ConfigureAwait(false))
{
string key =
GetEducationOrganizationIdentifiersByEducationOrganizationIdCacheKey(
valueMap.EducationOrganizationId,
context);
educationOrganizationIdentifiersByEducationOrganizationId.TryAdd(key, valueMap);
//NOTE: future support for string based state org ids.
//string key2 = GetEducationOrganizationIdentifiersByStateOrganizationIdCacheKey(valueMap.StateOrganizationId, context);
//educationOrganizationIdentifiersByStateOrganizationId.TryAdd(key2, valueMap);
}
if (_logger.IsDebugEnabled)
{
stopwatch.Stop();
_logger.DebugFormat(
"Education Organization Id cache initialized {0:n0} entries in {1:n0} milliseconds.",
educationOrganizationIdentifiersByEducationOrganizationId.Count,
stopwatch.ElapsedMilliseconds);
}
entry.SetMaps(
educationOrganizationIdentifiersByStateOrganizationId,
educationOrganizationIdentifiersByEducationOrganizationId);
string cacheKey = GetEducationOrganizationCacheKey(context);
//Now that it's loaded extend the cache expiration.
_cacheProvider.Insert(cacheKey, entry, DateTime.MaxValue, TimeSpan.FromHours(4));
}
catch (Exception ex)
{
_logger.ErrorFormat(
"An exception occurred while trying to warm the EducationOrganizationCache. EducationOrganizationIdentifiers will be retrieved individually.\r\n{0}",
ex);
}
}
