/// <summary>
/// Gets the instance.
/// </summary>
/// <param name="loadObject">The load object.</param>
/// <param name="cacheItemName">Name of the cache item.</param>
/// <param name="iterationKey">The iteration key.</param>
/// <returns></returns>
internal static ContinuousCacheAccessThreadHelper <T> GetInstance(LoadSerializedObjectDelegate <T> loadObject, string cacheItemName, string iterationKey)
{
ContinuousCacheAccessThreadHelper <T> record = new ContinuousCacheAccessThreadHelper <T>();
record._LoadObjectDelegate = loadObject;
record._CacheItemName = cacheItemName;
record._IterationKey = iterationKey ?? string.Empty;
return(record);
}
public static TriggerAsynchronousFetchStatus TriggerAsynchronousFetch <T>(LoadSerializedObjectDelegate <T> loadObject, string cacheItemName
, string iterationKey, CacheItemContainer cacheItemContainer)
where T : class
{
ContinuousCacheAccessThreadHelper <T> threadHelper;
Thread thread;
switch (cacheItemContainer.CacheMode)
{
case CacheMode.InProcess:
// we are in the extended lifespan, so we need to check whether we have to reload the object
if (ContinuousCacheAccessSynchronizationManager.SetIsFetchingDataFlagToTrue(cacheItemContainer.CacheKey))
{
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "TRIGGER ASYNCHRONOUS FETCH: Initialize asynchronous fetch");
#endif
#endregion
threadHelper = ContinuousCacheAccessThreadHelper <T> .GetInstance(loadObject, cacheItemName, iterationKey);
thread = new Thread(threadHelper.FetchAndInsertData);
thread.Start();
return(TriggerAsynchronousFetchStatus.SucessfullyInitialized);
}
else
{
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "TRIGGER ASYNCHRONOUS FETCH: Already in process...");
#endif
#endregion
return(TriggerAsynchronousFetchStatus.AlreadyFetching);
}
case CacheMode.Memcached:
case CacheMode.MemcachedProtocolBufferSerialization:
DateTime temporaryExpiry = DateTime.UtcNow.Add(cacheItemContainer.CacheItem.LifeSpan);
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "TRIGGER ASYNCHRONOUS FETCH MEMCACHED: Try to add stale key with temporary expiry date " + temporaryExpiry.ToString("HH:mm:ss.fff"));
#endif
#endregion
if (DistributedCache.Add(cacheItemContainer.MemcachedStaleCacheKey, new object(), temporaryExpiry))
{ // great, we have to reload now
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "TRIGGER ASYNCHRONOUS FETCH MEMCACHED: Initialize asynchronous fetch");
#endif
#endregion
threadHelper = ContinuousCacheAccessThreadHelper <T> .GetInstance(loadObject, cacheItemName, iterationKey);
thread = new Thread(threadHelper.FetchAndInsertMemcachedData);
thread.Start();
return(TriggerAsynchronousFetchStatus.SucessfullyInitialized);
}
else
{
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "TRIGGER ASYNCHRONOUS FETCH MEMCACHED: Already in process...");
#endif
#endregion
return(TriggerAsynchronousFetchStatus.AlreadyFetching);
}
default: throw new ArgumentException("CacheMode " + cacheItemContainer.CacheMode + " not allowed");
}
}
