/// <summary>
/// Execute the operation against GSM in the current transaction scope.
/// </summary>
/// <param name="ts">Transaction scope.</param>
/// <returns>
/// Results of the operation.
/// </returns>
public override IStoreResults DoGlobalExecute(IStoreTransactionScope ts)
{
// If no ranges are specified, blindly mark everything for deletion.
return(ts.ExecuteOperation(
StoreOperationRequestBuilder.SpFindShardMappingByKeyGlobal,
StoreOperationRequestBuilder.FindShardMappingByKeyGlobal(_shardMap, _key)));
}
/// <summary>
/// Finds all mappings to be purged based on the given input ranges.
/// </summary>
/// <param name="ts">GSM transaction scope.</param>
/// <returns>Mappings which are to be removed.</returns>
private IEnumerable <IStoreMapping> GetMappingsToPurge(IStoreTransactionScope ts)
{
// Find all the mappings in GSM belonging to the shard
IStoreResults gsmMappingsByShard = ts.ExecuteOperation(
StoreOperationRequestBuilder.SpGetAllShardMappingsGlobal,
StoreOperationRequestBuilder.GetAllShardMappingsGlobal(_shardMap, _shard, null));
if (gsmMappingsByShard.Result != StoreResult.Success)
{
// Possible errors are:
// StoreResult.ShardMapDoesNotExist
// StoreResult.StoreVersionMismatch
// StoreResult.MissingParametersForStoredProcedure
throw StoreOperationErrorHandler.OnRecoveryErrorGlobal(
gsmMappingsByShard,
_shardMap,
_shard,
ShardManagementErrorCategory.Recovery,
this.OperationName,
StoreOperationRequestBuilder.SpGetAllShardMappingsGlobal);
}
IDictionary <ShardRange, IStoreMapping> intersectingMappings = new Dictionary <ShardRange, IStoreMapping>();
foreach (IStoreMapping gsmMappingByShard in gsmMappingsByShard.StoreMappings)
{
ShardKey min = ShardKey.FromRawValue(
_shardMap.KeyType,
gsmMappingByShard.MinValue);
ShardKey max = null;
switch (_shardMap.MapType)
{
case ShardMapType.Range:
max = ShardKey.FromRawValue(
_shardMap.KeyType,
gsmMappingByShard.MaxValue);
break;
default:
Debug.Assert(_shardMap.MapType == ShardMapType.List);
max = ShardKey.FromRawValue(
_shardMap.KeyType,
gsmMappingByShard.MinValue).GetNextKey();
break;
}
intersectingMappings.Add(new ShardRange(min, max), gsmMappingByShard);
}
// We need to discover, also, the range of intersecting mappings, so we can transitively detect
// inconsistencies with other shards.
foreach (IStoreMapping lsmMapping in _mappingsToRemove)
{
ShardKey min = ShardKey.FromRawValue(_shardMap.KeyType, lsmMapping.MinValue);
IStoreResults gsmMappingsByRange;
switch (_shardMap.MapType)
{
case ShardMapType.Range:
gsmMappingsByRange = ts.ExecuteOperation(
StoreOperationRequestBuilder.SpGetAllShardMappingsGlobal,
StoreOperationRequestBuilder.GetAllShardMappingsGlobal(
_shardMap,
null,
new ShardRange(
min,
ShardKey.FromRawValue(_shardMap.KeyType, lsmMapping.MaxValue))));
break;
default:
Debug.Assert(_shardMap.MapType == ShardMapType.List);
gsmMappingsByRange = ts.ExecuteOperation(
StoreOperationRequestBuilder.SpFindShardMappingByKeyGlobal,
StoreOperationRequestBuilder.FindShardMappingByKeyGlobal(
_shardMap,
min));
break;
}
if (gsmMappingsByRange.Result != StoreResult.Success)
{
if (gsmMappingsByRange.Result != StoreResult.MappingNotFoundForKey)
{
// Possible errors are:
// StoreResult.ShardMapDoesNotExist
// StoreResult.StoreVersionMismatch
// StoreResult.MissingParametersForStoredProcedure
throw StoreOperationErrorHandler.OnRecoveryErrorGlobal(
gsmMappingsByRange,
_shardMap,
_shard,
ShardManagementErrorCategory.Recovery,
this.OperationName,
_shardMap.MapType == ShardMapType.Range ?
StoreOperationRequestBuilder.SpGetAllShardMappingsGlobal :
StoreOperationRequestBuilder.SpFindShardMappingByKeyGlobal);
}
else
{
// No intersections being found is fine. Skip to the next mapping.
Debug.Assert(_shardMap.MapType == ShardMapType.List);
}
}
else
{
foreach (IStoreMapping gsmMappingByRange in gsmMappingsByRange.StoreMappings)
{
ShardKey minGlobal = ShardKey.FromRawValue(_shardMap.KeyType, gsmMappingByRange.MinValue);
ShardKey maxGlobal = null;
switch (_shardMap.MapType)
{
case ShardMapType.Range:
maxGlobal = ShardKey.FromRawValue(_shardMap.KeyType, gsmMappingByRange.MaxValue);
break;
default:
Debug.Assert(_shardMap.MapType == ShardMapType.List);
maxGlobal = ShardKey.FromRawValue(_shardMap.KeyType, gsmMappingByRange.MinValue).GetNextKey();
break;
}
intersectingMappings[new ShardRange(minGlobal, maxGlobal)] = gsmMappingByRange;
}
}
}
return(intersectingMappings.Values);
}
