/// <summary> Attempts to load the entity from the second-level cache. </summary>
/// <param name="event">The load event </param>
/// <param name="persister">The persister for the entity being requested for load </param>
/// <param name="options">The load options. </param>
/// <param name="cancellationToken">A cancellation token that can be used to cancel the work</param>
/// <returns> The entity from the second-level cache, or null. </returns>
protected virtual async Task <object> LoadFromSecondLevelCacheAsync(LoadEvent @event, IEntityPersister persister, LoadType options, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
ISessionImplementor source = @event.Session;
bool useCache = persister.HasCache && source.CacheMode.HasFlag(CacheMode.Get) &&
@event.LockMode.LessThan(LockMode.Read);
if (!useCache)
{
return(null);
}
ISessionFactoryImplementor factory = source.Factory;
var batchSize = persister.GetBatchSize();
var entityBatch = source.PersistenceContext.BatchFetchQueue.QueryCacheQueue
?.GetEntityBatch(persister, @event.EntityId);
if (entityBatch != null || batchSize > 1 && persister.Cache.PreferMultipleGet())
{
// The first item in the array is the item that we want to load
if (entityBatch != null)
{
if (entityBatch.Length == 0)
{
return(null); // The key was already checked
}
batchSize = entityBatch.Length;
}
if (entityBatch == null)
{
entityBatch = await(source.PersistenceContext.BatchFetchQueue.GetEntityBatchAsync(persister, @event.EntityId, batchSize, false, cancellationToken)).ConfigureAwait(false);
}
// Ignore null values as the retrieved batch may contains them when there are not enough
// uninitialized entities in the queue
var keys = new List <CacheKey>(batchSize);
for (var i = 0; i < entityBatch.Length; i++)
{
var key = entityBatch[i];
if (key == null)
{
break;
}
keys.Add(source.GenerateCacheKey(key, persister.IdentifierType, persister.RootEntityName));
}
var cachedObjects = await(persister.Cache.GetManyAsync(keys.ToArray(), source.Timestamp, cancellationToken)).ConfigureAwait(false);
for (var i = 1; i < cachedObjects.Length; i++)
{
cancellationToken.ThrowIfCancellationRequested();
await(AssembleAsync(
keys[i],
cachedObjects[i],
new LoadEvent(entityBatch[i], @event.EntityClassName, @event.LockMode, @event.Session),
false)).ConfigureAwait(false);
}
cancellationToken.ThrowIfCancellationRequested();
return(await(AssembleAsync(keys[0], cachedObjects[0], @event, true)).ConfigureAwait(false));
}
var cacheKey = source.GenerateCacheKey(@event.EntityId, persister.IdentifierType, persister.RootEntityName);
var cachedObject = await(persister.Cache.GetAsync(cacheKey, source.Timestamp, cancellationToken)).ConfigureAwait(false);
cancellationToken.ThrowIfCancellationRequested();
return(await(AssembleAsync(cacheKey, cachedObject, @event, true)).ConfigureAwait(false));
Task <object> AssembleAsync(CacheKey ck, object ce, LoadEvent evt, bool alterStatistics)
{
try
{
if (factory.Statistics.IsStatisticsEnabled && alterStatistics)
{
if (ce == null)
{
factory.StatisticsImplementor.SecondLevelCacheMiss(persister.Cache.RegionName);
log.Debug("Entity cache miss: {0}", ck);
}
else
{
factory.StatisticsImplementor.SecondLevelCacheHit(persister.Cache.RegionName);
log.Debug("Entity cache hit: {0}", ck);
}
}
if (ce != null)
{
CacheEntry entry = (CacheEntry)persister.CacheEntryStructure.Destructure(ce, factory);
// Entity was found in second-level cache...
// NH: Different behavior (take a look to options.ExactPersister (NH-295))
if (!options.ExactPersister || persister.EntityMetamodel.SubclassEntityNames.Contains(entry.Subclass))
{
return(AssembleCacheEntryAsync(entry, evt.EntityId, persister, evt, cancellationToken));
}
}
return(Task.FromResult <object>(null));
}
catch (Exception ex)
{
return(Task.FromException <object>(ex));
}
}
}
private bool ShouldExecuteBatch(IEntityPersister persister, AbstractCacheBatch batch)
{
return(batch != _currentBatch || _currentPersister != persister ||
_currentBatch.BatchSize >= persister.GetBatchSize());
}
/// <summary> Attempts to load the entity from the second-level cache. </summary>
/// <param name="event">The load event </param>
/// <param name="persister">The persister for the entity being requested for load </param>
/// <param name="options">The load options. </param>
/// <returns> The entity from the second-level cache, or null. </returns>
protected virtual object LoadFromSecondLevelCache(LoadEvent @event, IEntityPersister persister, LoadType options)
{
ISessionImplementor source = @event.Session;
bool useCache = persister.HasCache && source.CacheMode.HasFlag(CacheMode.Get) &&
@event.LockMode.LessThan(LockMode.Read);
if (!useCache)
{
return(null);
}
ISessionFactoryImplementor factory = source.Factory;
var batchSize = persister.GetBatchSize();
if (batchSize > 1 && persister.Cache.PreferMultipleGet())
{
// The first item in the array is the item that we want to load
var entityBatch =
source.PersistenceContext.BatchFetchQueue.GetEntityBatch(persister, @event.EntityId, batchSize, false);
// Ignore null values as the retrieved batch may contains them when there are not enough
// uninitialized entities in the queue
var keys = new List <CacheKey>(batchSize);
for (var i = 0; i < entityBatch.Length; i++)
{
var key = entityBatch[i];
if (key == null)
{
break;
}
keys.Add(source.GenerateCacheKey(key, persister.IdentifierType, persister.RootEntityName));
}
var cachedObjects = persister.Cache.GetMany(keys.ToArray(), source.Timestamp);
for (var i = 1; i < cachedObjects.Length; i++)
{
Assemble(
keys[i],
cachedObjects[i],
new LoadEvent(entityBatch[i], @event.EntityClassName, @event.LockMode, @event.Session),
false);
}
return(Assemble(keys[0], cachedObjects[0], @event, true));
}
var cacheKey = source.GenerateCacheKey(@event.EntityId, persister.IdentifierType, persister.RootEntityName);
var cachedObject = persister.Cache.Get(cacheKey, source.Timestamp);
return(Assemble(cacheKey, cachedObject, @event, true));
object Assemble(CacheKey ck, object ce, LoadEvent evt, bool alterStatistics)
{
if (factory.Statistics.IsStatisticsEnabled && alterStatistics)
{
if (ce == null)
{
factory.StatisticsImplementor.SecondLevelCacheMiss(persister.Cache.RegionName);
log.Debug("Entity cache miss: {0}", ck);
}
else
{
factory.StatisticsImplementor.SecondLevelCacheHit(persister.Cache.RegionName);
log.Debug("Entity cache hit: {0}", ck);
}
}
if (ce != null)
{
CacheEntry entry = (CacheEntry)persister.CacheEntryStructure.Destructure(ce, factory);
// Entity was found in second-level cache...
// NH: Different behavior (take a look to options.ExactPersister (NH-295))
if (!options.ExactPersister || persister.EntityMetamodel.SubclassEntityNames.Contains(entry.Subclass))
{
return(AssembleCacheEntry(entry, evt.EntityId, persister, evt));
}
}
return(null);
}
}
