public async Task <bool> Execute()
{
if (sortedByGuid.Count < 2)
{
// to perform a transaction, there must be at least two items added
return(false);
}
if (transactionId == default(Guid))
{
transactionId = Guid.NewGuid();
ExpireTimestamp = DateTime.Now.AddMinutes(TransactionStatusPoolHelper.PURGE_PERIOD_MINUTES);
}
else if (DateTime.Now < ExpireTimestamp)
{
var transactionStatus = GrainClient.GrainFactory.GetGrain <ITransactionStatusPool>(TransactionStatusPoolHelper.GetHash(transactionId));
if (await transactionStatus.IsComplete(transactionId))
{
// we know the transaction completed, don't bother retrying
return(true);
}
}
else
{
// perhaps throw an exception instead? Transaction has expired and cannot be retried.
return(false);
}
// avoid deadlocks by sorting grains in a deterministic fashion
var transactionitems = new List <Tuple <ITransactionGrain <TDeltaState>, TDeltaState> >();
foreach (var item in sortedByGuid.Values)
{
transactionitems.Add(item);
}
var transaction = new GrainTransactionData <TDeltaState>()
{
TransactionId = transactionId,
Values = transactionitems
};
ITransactionGrain <TDeltaState> firstgrain = transaction.Values[0].Item1;
return(await firstgrain.Transact(transaction, 0));
}
public void Add(ITransactionGrain <TDeltaState> target, TDeltaState deltaState)
{
Guid targetId = target.GetPrimaryKey();
sortedByGuid.Add(targetId, new Tuple <ITransactionGrain <TDeltaState>, TDeltaState>(target, deltaState));
}