private void PrepareToLoadEntities(TranslationResult translationResult)
{
// cancelling the previous index creation, if there was one
this.CurrentIndexCreator = null;
// skipping added and removed entities
this.ClearModifications();
// if a HashKey value was explicitly specified
string hashKeyName = this.TableDefinition.HashKeys[0];
if (this.HashKeyValue != null && !translationResult.Conditions.ContainsKey(hashKeyName))
{
// then adding a condition for it
translationResult.Conditions.AddCondition
(
hashKeyName,
new SearchCondition(ScanOperator.Equal, this.HashKeyValue)
);
}
#if DEBUG
this._loadOperationStopwatch = new Stopwatch();
this._loadOperationStopwatch.Start();
#endif
}
private bool TryLoadFromCache(TranslationResult translationResult, Type entityType, out object result)
{
result = null;
var conditions4Cache = translationResult.Conditions;
// if an explicit HashKey value is specified for table, then
// we need to remove a condition for it from SearchConditions before passing them to cache
// implementation. That's because the entity's Type doesn't contain a HashKey property.
if (this.HashKeyValue != null)
{
conditions4Cache = conditions4Cache.ExcludeField(this.TableDefinition.HashKeys[0]);
}
// implementing Count()
if (translationResult.CountRequested)
{
int?countFromCache = this.Cache.GetCount(conditions4Cache);
if (countFromCache.HasValue)
{
result = countFromCache.Value;
return(true);
}
}
else
{
// getting the entities themselves from cache
var docsFromCache = this.Cache.GetEntities(conditions4Cache, translationResult.AttributesToGet, translationResult.OrderByColumn, translationResult.OrderByDesc);
if (docsFromCache != null)
{
result = this.CreateDocArrayReader(docsFromCache, entityType, translationResult.ProjectionFunc);
return(true);
}
}
// If we failed to get from cache, then start filling an index in cache
// (this should be started before querying DynamoDb and only when table (full) entities are requested)
this.CurrentIndexCreator =
(translationResult.ProjectionFunc == null)
?
this.Cache.StartCreatingIndex(conditions4Cache)
:
this.Cache.StartCreatingProjectionIndex(conditions4Cache, translationResult.AttributesToGet)
;
return(false);
}
protected virtual void InitReader(ISupervisableEnumerable reader)
{
// We need to detect the moment, when enumeration is finished. To put an index to cache
reader.EnumerationFinished += () =>
{
#if DEBUG
if (this._loadOperationStopwatch != null)
{
this._loadOperationStopwatch.Stop();
this.Log("Load operation took {0} ms", this._loadOperationStopwatch.ElapsedMilliseconds);
this._loadOperationStopwatch = null;
}
#endif
// storing the filled index to cache
var curIndexCreator = this.CurrentIndexCreator;
if (curIndexCreator != null)
{
curIndexCreator.Dispose();
}
this.CurrentIndexCreator = null;
};
}
private bool TryLoadFromCache(TranslationResult translationResult, Type entityType, out object result)
{
result = null;
var conditions4Cache = translationResult.Conditions;
// if an explicit HashKey value is specified for table, then
// we need to remove a condition for it from SearchConditions before passing them to cache
// implementation. That's because the entity's Type doesn't contain a HashKey property.
if (this.HashKeyValue != null)
{
conditions4Cache = conditions4Cache.ExcludeField(this.TableDefinition.HashKeys[0]);
}
// implementing Count()
if (translationResult.CountRequested)
{
int? countFromCache = this.Cache.GetCount(conditions4Cache);
if (countFromCache.HasValue)
{
result = countFromCache.Value;
return true;
}
}
else
{
// getting the entities themselves from cache
var docsFromCache = this.Cache.GetEntities(conditions4Cache, translationResult.AttributesToGet, translationResult.OrderByColumn, translationResult.OrderByDesc);
if (docsFromCache != null)
{
result = this.CreateDocArrayReader(docsFromCache, entityType, translationResult.ProjectionFunc);
return true;
}
}
// If we failed to get from cache, then start filling an index in cache
// (this should be started before querying DynamoDb and only when table (full) entities are requested)
this.CurrentIndexCreator =
(translationResult.ProjectionFunc == null)
?
this.Cache.StartCreatingIndex(conditions4Cache)
:
this.Cache.StartCreatingProjectionIndex(conditions4Cache, translationResult.AttributesToGet)
;
return false;
}
protected virtual void InitReader(ISupervisableEnumerable reader)
{
// We need to detect the moment, when enumeration is finished. To put an index to cache
reader.EnumerationFinished += () =>
{
#if DEBUG
if (this._loadOperationStopwatch != null)
{
this._loadOperationStopwatch.Stop();
this.Log("Load operation took {0} ms", this._loadOperationStopwatch.ElapsedMilliseconds);
this._loadOperationStopwatch = null;
}
#endif
// storing the filled index to cache
var curIndexCreator = this.CurrentIndexCreator;
if (curIndexCreator != null)
{
curIndexCreator.Dispose();
}
this.CurrentIndexCreator = null;
};
}
/// <summary>
/// Executes a get/query/scan request against the table
/// </summary>
internal object LoadEntities(TranslationResult translationResult, Type entityType)
{
// cancelling the previous index creation, if there was one
this.CurrentIndexCreator = null;
// skipping added and removed entities
this.ClearModifications();
// if a HashKey value was explicitly specified
if (this.HashKeyValue != null)
{
// then adding a condition for it
translationResult.Conditions.AddCondition
(
this.TableDefinition.HashKeys[0],
new SearchCondition(ScanOperator.Equal, this.HashKeyValue)
);
}
#if DEBUG
this._loadOperationStopwatch = new Stopwatch();
this._loadOperationStopwatch.Start();
#endif
return this.InternalLoadEntities(translationResult, entityType);
}
public SetIndexOnEmailStartupTask(IIndexCreator indexCreator) => _indexCreator = indexCreator;
