/// <summary>
/// Remove one row from the reminder table
/// </summary>
/// <param name="grainRef"> specific grain ref to locate the row </param>
/// <param name="reminderName"> remider name to locate the row </param>
/// <param name="eTag"> e tag </param>
/// <returns> Return true if the row was removed </returns>
public async Task <bool> RemoveRow(GrainReference grainRef, string reminderName, string eTag)
{
var reminderId = ConstructReminderId(serviceId, grainRef, reminderName);
var keys = new Dictionary <string, AttributeValue>
{
{ $"{REMINDER_ID_PROPERTY_NAME}", new AttributeValue(reminderId) },
{ $"{GRAIN_HASH_PROPERTY_NAME}", new AttributeValue {
N = grainRef.GetUniformHashCode().ToString()
} }
};
try
{
var conditionalValues = new Dictionary <string, AttributeValue> {
{ CURRENT_ETAG_ALIAS, new AttributeValue {
N = eTag
} }
};
var expression = $"{ETAG_PROPERTY_NAME} = {CURRENT_ETAG_ALIAS}";
await storage.DeleteEntryAsync(TABLE_NAME_DEFAULT_VALUE, keys, expression, conditionalValues).ConfigureAwait(false);
return(true);
}
catch (ConditionalCheckFailedException)
{
return(false);
}
}
/// <summary> Clear / Delete state data function for this storage provider. </summary>
/// <remarks>
/// If the <c>DeleteStateOnClear</c> is set to <c>true</c> then the table row
/// for this grain will be deleted / removed, otherwise the table row will be
/// cleared by overwriting with default / null values.
/// </remarks>
/// <see cref="IStorageProvider.ClearStateAsync"/>
public async Task ClearStateAsync(string grainType, GrainReference grainReference, IGrainState grainState)
{
if (storage == null)
{
throw new ArgumentException("GrainState-Table property not initialized");
}
string partitionKey = GetKeyString(grainReference);
if (Log.IsVerbose3)
{
Log.Verbose3(ErrorCode.StorageProviderBase, "Clearing: GrainType={0} Pk={1} Grainid={2} ETag={3} DeleteStateOnClear={4} from Table={5}", grainType, partitionKey, grainReference, grainState.ETag, isDeleteStateOnClear, tableName);
}
string rowKey = AWSUtils.ValidateDynamoDBRowKey(grainType);
var record = new GrainStateRecord {
GrainReference = partitionKey, ETag = string.IsNullOrWhiteSpace(grainState.ETag) ? 0 : int.Parse(grainState.ETag), GrainType = rowKey
};
var operation = "Clearing";
try
{
if (isDeleteStateOnClear)
{
operation = "Deleting";
var keys = new Dictionary <string, AttributeValue>();
keys.Add(GRAIN_REFERENCE_PROPERTY_NAME, new AttributeValue(record.GrainReference));
keys.Add(GRAIN_TYPE_PROPERTY_NAME, new AttributeValue(record.GrainType));
await storage.DeleteEntryAsync(tableName, keys).ConfigureAwait(false);
grainState.ETag = string.Empty;
}
else
{
await WriteStateInternal(grainState, record, true);
}
}
catch (Exception exc)
{
Log.Error(ErrorCode.StorageProviderBase, string.Format("Error {0}: GrainType={1} Grainid={2} ETag={3} from Table={4} Exception={5}",
operation, grainType, grainReference, grainState.ETag, tableName, exc.Message), exc);
throw;
}
}
