public void ExecuteTransaction(IList <DataRequest> requests)
{
// the same connector will not execute transactions in parallel
lock (_transactionSync)
{
var status = new TransactionState();
status.Initialize(requests, CacheClients);
status.CheckStatus(TransactionState.Status.Initialized);
status.TryExecuteAsSingleStage();
if (status.CurrentStatus == TransactionState.Status.Completed)
{
TransactionStatistics.ExecutedAsSingleStage();
return;
}
// stage zero : send the transaction request to the servers and wait for them to acquire write locks
status.AcquireLock();
status.CheckStatus(TransactionState.Status.LocksAcquired);
// first stage: the durable transaction is written in the transaction log
status.ProceedWithFirstStage();
// second stage: commit or rollback only the servers that processed successfully the first stage
// (if a server answered with an exception response the transaction was already rolled back on this server)
if (status.CurrentStatus == TransactionState.Status.FirstStageCompleted)
{
// commit the transaction
status.CommitSecondStage();
status.CheckStatus(TransactionState.Status.SecondStageCompleted);
// close the transaction
status.CloseTransaction();
status.CheckStatus(TransactionState.Status.Completed);
TransactionStatistics.NewTransactionCompleted();
}
else
{
status.Rollback();
throw new CacheException(
$"Error in two stage transaction. The transaction was successfully rolled back: {status.ExceptionType}", status.ExceptionType);
}
}
}