static SlimCacheManager()
{
_StaticCacheController = CacheControllerFactory.CreateCacheController();
_Cache = MemoryCache.Default;
CacheItemContainer container;
foreach (ICacheItem item in _StaticCacheController.IterateOverCacheItems())
{
// get the global cachesettings
if (item.LifeSpan.TotalMilliseconds <= 0)
{
item.LifeSpan = _StaticCacheController.LifeSpanInterval;
}
if (item.LifeSpan == TimeSpan.Zero)
{
throw new CachingException("Cache Configuration item with key " + item.Name + " has no expiry time specified. Either set the Seconds or Minutes value. It is allowed to set both values at a time.");
}
container = new CacheItemContainer(
item
, string.IsNullOrEmpty(item.CacheKey) ? item.Name : item.CacheKey);
ContinuousCacheAccessSynchronizationManager.InitializeCacheItemSynchronizationController(container);
}
}
public static TriggerAsynchronousFetchStatus TriggerAsynchronousFetch <T>(LoadSerializedObjectDelegate <T> loadObject, string cacheItemName
, string iterationKey, CacheItemContainer cacheItemContainer)
where T : class
{
ContinuousCacheAccessThreadHelper <T> threadHelper;
Thread thread;
// 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);
}
}
/// <summary>
/// Fetches data and inserts it into cache
/// </summary>
public void FetchAndInsertData()
{
CacheItemContainer cacheItemContainer = ContinuousCacheAccessSynchronizationManager.GetCacheItemContainer(_CacheItemName);
string cacheKey = cacheItemContainer.CacheKey + _IterationKey;
ContinuousCacheAccessSynchronizationManager.SetIsFetchingDataFlag(cacheKey, true);
lock (ContinuousCacheAccessSynchronizationManager.CacheItemNameLocks[cacheItemContainer.CacheItem.Name])
{
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "SEPARATE THREAD: Starting FetchAndInsertData at " + DateTime.UtcNow.ToString("HH:mm:ss.fff"));
#endif
#endregion
T item = default(T);
try { item = _LoadObjectDelegate.Invoke(); }
catch (Exception e) { throw new CachingException("An error occurred during the execution of the loadObject delegate. See the inner exception for further details.", e); }
if (item != null)
{
cacheItemContainer.LatestFetch = DateTime.UtcNow;
CacheItemPolicy cacheItemPolicy = new CacheItemPolicy();
cacheItemPolicy.Priority = cacheItemContainer.CacheItem.CacheItemPriority;
cacheItemPolicy.AbsoluteExpiration = cacheItemContainer.ActualExpiryDate;
SlimCacheManager._Cache.Set(
cacheKey
, item
, cacheItemPolicy);
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "\n***\n*INPROCESS CACHE INSERT:\n*\t\t\tInserted new object into cache at " + cacheItemContainer.LatestFetch.ToString("HH:mm:ss.fff")
+ "\n*\t\t\tActual expiry date: " + cacheItemContainer.ActualExpiryDate.ToString("HH:mm:ss.fff")
+ "\n*\t\t\tInserted new stale key with expiry date: " + cacheItemContainer.SpecifiedExpiryDate.ToString("HH:mm:ss.fff")
+ "\n************************************************************************************************\n");
#endif
#endregion
}
}
ContinuousCacheAccessSynchronizationManager.SetIsFetchingDataFlag(cacheKey, false);
}
/// <summary>
/// Creates the save item instance.
/// </summary>
/// <param name="cacheItemName">Name of the cache item.</param>
/// <returns></returns>
private static CacheItemContainer CreateSaveItemInstance(string cacheItemName)
{
// we don't check whether the specified name acutally exists but just throw a key not found exception
return(ContinuousCacheAccessSynchronizationManager.GetCacheItemContainer(cacheItemName));
}
/// <summary>
/// Loads from cache.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="cacheItemName">Name of the cache item.</param>
/// <param name="iterationKey">The iteration key.</param>
/// <param name="loadObject">The load object.</param>
/// <returns></returns>
public static T LoadFromCache <T>(string cacheItemName, string iterationKey, LoadSerializedObjectDelegate <T> loadObject) where T : class
{
T returnObject = default(T);
// get the section
CacheItemContainer cacheItemContainer = CreateSaveItemInstance(cacheItemName);
string cacheKey = cacheItemContainer.CacheKey + iterationKey ?? string.Empty;
if (_StaticCacheController.Enabled && cacheItemContainer.CacheItem.Enabled)
{// use cache
#region InProcess
returnObject = _Cache[cacheKey] as T;
if (returnObject == null)
{
lock (ContinuousCacheAccessSynchronizationManager.CacheItemNameLocks[cacheItemName])
{
// check again in case the object was inserted into cache after the conditional statement but before the Monitor lock
returnObject = _Cache[cacheKey] as T;
if (returnObject == null)
{// get new object and cache it
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "Item not found at cache");
#endif
#endregion
try { returnObject = loadObject.Invoke(); }
catch (Exception e) { throw new CachingException("An error occurred during the execution of the loadObject delegate. See the inner exception for further details.", e); }
if (returnObject != null)
{
cacheItemContainer.LatestFetch = DateTime.UtcNow;
CacheItemPolicy cacheItemPolicy = new CacheItemPolicy();
cacheItemPolicy.Priority = cacheItemContainer.CacheItem.CacheItemPriority;
cacheItemPolicy.AbsoluteExpiration = cacheItemContainer.ActualExpiryDate;
SlimCacheManager._Cache.Set(
cacheKey
, returnObject
, cacheItemPolicy);
#region debug
#if DEBUG
Trace.WriteLine("\n" + DebugConstants.DEBUG_PREFIX + "\n*INPROCESS CACHE INSERT:\n*\t\t\tInserted new object into cache at " + cacheItemContainer.LatestFetch.ToString("HH:mm:ss.fff")
+ "\n*\t\t\tActual expiry date: " + cacheItemContainer.ActualExpiryDate.ToString("HH:mm:ss.fff")
+ "\n*\t\t\tInserted new stale key with expiry date: " + cacheItemContainer.SpecifiedExpiryDate.ToString("HH:mm:ss.fff")
+ "\n*\t\t\tKey: " + cacheItemContainer.CacheKey
+ "\n************************************************************************************************\n");
#endif
#endregion
}
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "Item inserted at normal cache call");
#endif
#endregion
}
}
}
else
{
if (cacheItemContainer.CacheItem.UseContinuousAccess &&
cacheItemContainer.IsInExtendedLifeSpan(DateTime.UtcNow))
{
#region debug
#if DEBUG
Trace.WriteLine(DebugConstants.DEBUG_PREFIX + "IsInExtendedLifeSpan at " + DateTime.UtcNow.ToString("HH:mm:ss.fff"));
#endif
#endregion
// we are in the extended lifespan, so we need to check whether we have to reload the object
ContinuousCacheAccessSynchronizationManager.TriggerAsynchronousFetch <T>(loadObject, cacheItemName, iterationKey, cacheItemContainer);
}
}
#endregion
}
else
{// don't use cache
try { returnObject = loadObject.Invoke(); }
catch (Exception e) { throw new CachingException("An error occurred during the execution of the loadObject delegate. See the inner exception for further details.", e); }
}
return(returnObject);
}
