private async Task <object> TryExecuteGetAsync(TranslationResult translationResult, Type entityType)
{
var entityKey = translationResult.TryGetEntityKeyForTable(this.TableDefinition);
if (entityKey == null)
{
return(null);
}
Document resultDoc = null;
// first trying to get entity from cache, but only if it's not a projection
if (ReferenceEquals(this.TableEntityType, entityType))
{
resultDoc = this.Cache.GetSingleEntity(entityKey);
}
if (resultDoc != null)
{
this.Log("Get from cache: {0}", translationResult);
}
else
{
var config = new GetItemOperationConfig
{
AttributesToGet = translationResult.AttributesToGet,
ConsistentRead = this._consistentRead
};
translationResult.CustomizationHooks.ConfigureGetOperationCallback?.Invoke(config);
// if the entity is not found in cache - then getting it from DynamoDb
resultDoc = await this.TableDefinition.GetItemAsync
(
this.EntityKeyGetter.GetKeyDictionary(entityKey),
config
)
.ConfigureAwait(false); // This is important, as this method can be called synchronously from outside. Without this line it will hang in ASP.Net.
// putting the entity to cache as well
this.Cache.PutSingleLoadedEntity(entityKey, resultDoc);
this.Log("Get from DynamoDb: {0}", translationResult);
}
// creating an enumerator for a single value or an empty enumerator
return(this.CreateSingleDocReader(resultDoc, entityType, translationResult.ProjectionFunc));
}
private bool TryExecuteGet(TranslationResult translationResult, Type entityType, out object result)
{
result = null;
var entityKey = translationResult.TryGetEntityKeyForTable(this.TableDefinition);
if (entityKey == null)
{
return(false);
}
Document resultDoc = null;
// first trying to get entity from cache, but only if it's not a projection
if (ReferenceEquals(this.TableEntityType, entityType))
{
resultDoc = this.Cache.GetSingleEntity(entityKey);
}
if (resultDoc != null)
{
this.Log("Get from cache: " + translationResult);
}
else
{
// if the entity is not found in cache - then getting it from DynamoDb
resultDoc = this.TableDefinition.GetItem
(
this.EntityKeyGetter.GetKeyDictionary(entityKey),
new GetItemOperationConfig
{
AttributesToGet = translationResult.AttributesToGet,
ConsistentRead = this._consistentRead
}
);
// putting the entity to cache as well
this.Cache.PutSingleLoadedEntity(entityKey, resultDoc);
this.Log("Get from DynamoDb: " + translationResult);
}
// creating an enumerator for a single value or an empty enumerator
result = this.CreateSingleDocReader(resultDoc, entityType, translationResult.ProjectionFunc);
return(true);
}
