private void Enlist(Transaction transaction)
{
if (transaction == null)
{
// no enlistment as we are not in a TransactionScope
return;
}
// try to enlist as a PSPE
if (!transaction.EnlistPromotableSinglePhase(this))
{
// our enlistmente fail so we need to enlist ourselves as durable.
// we create a transaction directly instead of using BeginTransaction that GraphClient
// doesn't store it in its stack of scopes.
var localTransaction = new Neo4jRestTransaction(client);
localTransaction.ForceKeepAlive();
transactionId = localTransaction.Id;
var resourceManager = GetResourceManager();
var propagationToken = TransactionInterop.GetTransmitterPropagationToken(transaction);
var transactionExecutionEnvironment = new TransactionExecutionEnvironment(client.ExecutionConfiguration)
{
TransactionId = localTransaction.Id,
TransactionBaseEndpoint = client.TransactionEndpoint
};
resourceManager.Enlist(transactionExecutionEnvironment, propagationToken);
localTransaction.Cancel();
}
enlistedInTransactions.Add(transaction);
}
public byte[] Promote()
{
// we have been promoted to MSTDC, so we have to clean the local resources
if (transaction == null)
{
transaction = new Neo4jRestTransaction(client);
}
// do a keep alive in case the promotion takes too long or in case we don't have an ID
transaction.ForceKeepAlive();
transactionId = transaction.Id;
transaction.Cancel();
transaction = null;
if (transactionId == 0)
{
throw new InvalidOperationException("For some reason we don't have a TransactionContext ID");
}
var resourceManager = GetResourceManager();
return(resourceManager.Promote(new TransactionExecutionEnvironment(client.ExecutionConfiguration)
{
TransactionId = transactionId,
TransactionBaseEndpoint = client.TransactionEndpoint
}));
}
public void Initialize()
{
// enlistment has completed successfully.
// For now we can use local transactions
// we create it directly instead of using BeginTransaction that GraphClient
// doesn't store it in its stack of scopes.
transaction = new Neo4jRestTransaction(client);
}
public void Prepare(PreparingEnlistment preparingEnlistment)
{
try
{
Neo4jRestTransaction.DoKeepAlive(transactionExecutionEnvironment);
preparingEnlistment.Prepared();
}
catch (Exception e)
{
preparingEnlistment.ForceRollback(e);
}
}
public void Rollback(Enlistment enlistment)
{
try
{
Neo4jRestTransaction.DoRollback(transactionExecutionEnvironment);
}
finally
{
// always have to call Done() or we clog the resources
enlistment.Done();
}
}
public void SinglePhaseCommit(SinglePhaseEnlistment singlePhaseEnlistment)
{
try
{
Neo4jRestTransaction.DoCommit(transactionExecutionEnvironment);
singlePhaseEnlistment.Committed();
}
finally
{
singlePhaseEnlistment.Aborted();
}
}
public void Rollback(SinglePhaseEnlistment singlePhaseEnlistment)
{
// we receive a commit message
// if we own a local transaction, then commit that transaction
if (transaction != null)
{
transaction.Rollback();
transaction = null;
}
else if (transactionId > 0)
{
GetResourceManager().RollbackTransaction(transactionId);
}
singlePhaseEnlistment.Aborted();
enlistedInTransactions.Remove(Transaction.Current);
}
public void SinglePhaseCommit(SinglePhaseEnlistment singlePhaseEnlistment)
{
try
{
Neo4jRestTransaction.DoCommit(transactionExecutionEnvironment);
singlePhaseEnlistment.Committed();
}
catch (Exception e)
{
singlePhaseEnlistment.Aborted(e);
// TODO: Should we rethrow?
}
finally
{
singlePhaseEnlistment.Done();
}
}
public byte[] Promote()
{
// we have been promoted to MSTDC, so we have to clean the local resources
if (transaction == null)
{
transaction = new Neo4jRestTransaction(client);
}
// do a keep alive in case the promotion takes too long or in case we don't have an ID
transaction.ForceKeepAlive();
transactionId = transaction.Id;
transaction.Cancel();
transaction = null;
if (transactionId == 0)
{
throw new InvalidOperationException("For some reason we don't have a TransactionContext ID");
}
// BUG: .NET 4.7.1 introduced a bug where the current transaction wouldn't get restored
// after a call which crosses AppDomain boundaries. We have to restore it ourselves.
// Ref https://github.com/Microsoft/dotnet-framework-early-access/issues/7
var tx = Transaction.Current;
var resourceManager = GetResourceManager();
var res = resourceManager.Promote(new TransactionExecutionEnvironment(client.ExecutionConfiguration)
{
TransactionId = transactionId,
TransactionBaseEndpoint = client.TransactionEndpoint
});
// Only restore if the bug exists to avoid any potentially side-effects
// of setting the transaction
if (Transaction.Current == null)
{
Transaction.Current = tx;
}
return(res);
}
public void Prepare(PreparingEnlistment preparingEnlistment)
{
Neo4jRestTransaction.DoKeepAlive(transactionExecutionEnvironment);
preparingEnlistment.Done();
}