public override void WriteTransaction(Transaction transaction, Message message)
{
byte[] propToken = TransactionInterop.GetTransmitterPropagationToken(transaction);
// Find or compute extended information for the transaction
WsatExtendedInformation info;
if (!WsatExtendedInformationCache.Find(transaction, out info))
{
uint timeout = GetTimeoutFromTransaction(transaction);
info = (timeout != 0) ? new WsatExtendedInformation(null, timeout) : null;
}
OleTxTransactionHeader header = new OleTxTransactionHeader(propToken, info);
message.Headers.Add(header);
}
//=======================================================================================
// The demand is not added now (in 4.5), to avoid a breaking change. To be considered in the next version.
/*
* // We demand full trust because we use CoordinationContext and CoordinationServiceSecurity from a non-APTCA assembly.
* // The CoordinationContext constructor can call Environment.FailFast and it's recommended to not let partially trusted callers to bring down the process.
* // WSATs are not supported in partial trust, so customers should not be broken by this demand.
* [PermissionSet(SecurityAction.Demand, Unrestricted = true)]
*/
public void MarshalAsCoordinationContext(Transaction transaction,
out CoordinationContext context,
out RequestSecurityTokenResponse issuedToken)
{
Guid transactionId = transaction.TransactionInformation.DistributedIdentifier;
string nonNativeContextId = null;
context = new CoordinationContext(this.protocolVersion);
// Get timeout, description and isolation flags
uint timeout;
IsolationFlags isoFlags;
string description;
OleTxTransactionFormatter.GetTransactionAttributes(transaction,
out timeout,
out isoFlags,
out description);
context.IsolationFlags = isoFlags;
context.Description = description;
// If we can, use cached extended information
// Note - it may be worth using outgoing contexts more than once.
// We'll let performance profiling decide that question
WsatExtendedInformation info;
if (WsatExtendedInformationCache.Find(transaction, out info))
{
context.Expires = info.Timeout;
// The extended info cache only contains an identifier when it's non-native
if (!string.IsNullOrEmpty(info.Identifier))
{
context.Identifier = info.Identifier;
nonNativeContextId = info.Identifier;
}
}
else
{
context.Expires = timeout;
if (context.Expires == 0)
{
// If the timeout is zero, there are two possibilities:
// 1) This is a root transaction with an infinite timeout.
// 2) This is a subordinate transaction whose timeout was not flowed.
// We have no mechanism for distinguishing between the two cases.
//
// We could always return zero here, instead of using the local max timeout.
// The problem is that the 2004/08 WS-C spec does not specify the meaning
// of a zero expires field. While we accept zero to mean "as large as possible"
// it would be risky to expect others to do the same. So we only propagate
// zero in the expires field if the local max timeout has been disabled.
//
// This is MB 34596: how can we flow the real timeout?
context.Expires = (uint)TimeoutHelper.ToMilliseconds(this.wsatConfig.MaxTimeout);
}
}
if (context.Identifier == null)
{
context.Identifier = CoordinationContext.CreateNativeIdentifier(transactionId);
nonNativeContextId = null;
}
string tokenId;
if (!this.wsatConfig.IssuedTokensEnabled)
{
tokenId = null;
issuedToken = null;
}
else
{
CoordinationServiceSecurity.CreateIssuedToken(transactionId,
context.Identifier,
this.protocolVersion,
out issuedToken,
out tokenId);
}
AddressHeader refParam = new WsatRegistrationHeader(transactionId, nonNativeContextId, tokenId);
context.RegistrationService = wsatConfig.CreateRegistrationService(refParam, this.protocolVersion);
context.IsolationLevel = transaction.IsolationLevel;
context.LocalTransactionId = transactionId;
if (this.wsatConfig.OleTxUpgradeEnabled)
{
context.PropagationToken = TransactionInterop.GetTransmitterPropagationToken(transaction);
}
}