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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.ServiceModel.Channels
{
using System.ServiceModel;
using System.ServiceModel.Description;
using System.ServiceModel.Security;
using System.Xml;
using System.Collections.Generic;
static class TransactionPolicyStrings
{
public const string OptionalLocal = MetadataStrings.WSPolicy.Attributes.Optional;
public const string OptionalPrefix10 = MetadataStrings.WSPolicy.Prefix + "1";
public const string OptionalPrefix11 = MetadataStrings.WSPolicy.Prefix;
public const string OptionalNamespaceLegacy = "http://schemas.xmlsoap.org/ws/2002/12/policy";
public const string WsatTransactionsPrefix = AtomicTransactionExternalStrings.Prefix;
public const string WsatTransactionsNamespace10 = AtomicTransactionExternal10Strings.Namespace;
public const string WsatTransactionsNamespace11 = AtomicTransactionExternal11Strings.Namespace;
public const string WsatTransactionsLocal = "ATAssertion";
public const string OleTxTransactionsPrefix = OleTxTransactionExternalStrings.Prefix;
public const string OleTxTransactionsNamespace = OleTxTransactionExternalStrings.Namespace;
public const string OleTxTransactionsLocal = "OleTxAssertion";
public const string TrueValue = "true";
}
public sealed class TransactionFlowBindingElementImporter : IPolicyImportExtension
{
void IPolicyImportExtension.ImportPolicy(MetadataImporter importer, PolicyConversionContext context)
{
if (context == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("context");
}
// foreach property, we keep track of
// - everyoneAgreesAbout: all operations agree on a value
// - anOperationCaresAbout: at least one operation has expressed a preference
// - agreed value itself (which only matters if anOperationCaresAbout && everyoneAgrees)
bool everyoneAgreesAboutTransactions = true;
bool everyoneAgreesAboutTransactionProtocol = true;
TransactionFlowOption agreedTransactions = TransactionFlowOption.NotAllowed;
TransactionProtocol agreedTransactionProtocol = TransactionFlowDefaults.TransactionProtocol;
bool anOperationCaresAboutTransactions = false;
bool anOperationCaresAboutTransactionProtocol = false;
XmlElement oleTxTransactionsAssertion = null;
XmlElement wsatTransactionsAssertion = null;
foreach (OperationDescription operation in context.Contract.Operations)
{
ICollection<XmlElement> operationAssertions = context.GetOperationBindingAssertions(operation);
foreach (XmlElement element in operationAssertions)
{
if (element.NamespaceURI == TransactionPolicyStrings.OleTxTransactionsNamespace
&& element.LocalName == TransactionPolicyStrings.OleTxTransactionsLocal)
{
oleTxTransactionsAssertion = element;
TransactionFlowOption txFlow = GetOption(element, true);
UpdateTransactionFlowAtribute(operation, txFlow);
TrackAgreement(ref everyoneAgreesAboutTransactions,
txFlow,
ref agreedTransactions,
ref anOperationCaresAboutTransactions);
TrackAgreementTransactionProtocol(ref everyoneAgreesAboutTransactionProtocol,
TransactionProtocol.OleTransactions,
ref agreedTransactionProtocol,
ref anOperationCaresAboutTransactionProtocol);
}
else if (element.NamespaceURI == TransactionPolicyStrings.WsatTransactionsNamespace10
&& element.LocalName == TransactionPolicyStrings.WsatTransactionsLocal)
{
wsatTransactionsAssertion = element;
TransactionFlowOption txFlow = GetOption(element, true);
UpdateTransactionFlowAtribute(operation, txFlow);
TrackAgreement(ref everyoneAgreesAboutTransactions,
txFlow,
ref agreedTransactions,
ref anOperationCaresAboutTransactions);
TrackAgreementTransactionProtocol(ref everyoneAgreesAboutTransactionProtocol,
TransactionProtocol.WSAtomicTransactionOctober2004,
ref agreedTransactionProtocol,
ref anOperationCaresAboutTransactionProtocol);
}
else if (element.NamespaceURI == TransactionPolicyStrings.WsatTransactionsNamespace11
&& element.LocalName == TransactionPolicyStrings.WsatTransactionsLocal)
{
wsatTransactionsAssertion = element;
TransactionFlowOption txFlow = GetOption(element, false);
UpdateTransactionFlowAtribute(operation, txFlow);
TrackAgreement(ref everyoneAgreesAboutTransactions,
txFlow,
ref agreedTransactions,
ref anOperationCaresAboutTransactions);
TrackAgreementTransactionProtocol(ref everyoneAgreesAboutTransactionProtocol,
TransactionProtocol.WSAtomicTransaction11,
ref agreedTransactionProtocol,
ref anOperationCaresAboutTransactionProtocol);
}
}
// remove any imported assertions.
if (oleTxTransactionsAssertion != null)
operationAssertions.Remove(oleTxTransactionsAssertion);
if (wsatTransactionsAssertion != null)
operationAssertions.Remove(wsatTransactionsAssertion);
}
// setup the ContextFlowBindingElement (if needed) with any agreed-on information
if (anOperationCaresAboutTransactions)
{
TransactionFlowBindingElement tfbe = EnsureBindingElement(context);
tfbe.Transactions = true;
if (anOperationCaresAboutTransactionProtocol && everyoneAgreesAboutTransactionProtocol)
tfbe.TransactionProtocol = agreedTransactionProtocol;
else if (anOperationCaresAboutTransactionProtocol)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException(
SR.GetString(SR.SFxCannotHaveDifferentTransactionProtocolsInOneBinding)));
}
}
void UpdateTransactionFlowAtribute(OperationDescription operation, TransactionFlowOption txFlow)
{
operation.Behaviors.Remove<TransactionFlowAttribute>();
operation.Behaviors.Add(new TransactionFlowAttribute(txFlow));
}
static void TrackAgreement(ref bool everyoneAgrees, TransactionFlowOption option,
ref TransactionFlowOption agreedOption, ref bool anOperationCares)
{
if (!anOperationCares)
{
// this is the first operation to express a preference
agreedOption = option;
anOperationCares = true;
// everyoneAgrees is still true
}
else
{
if (option != agreedOption)
everyoneAgrees = false;
}
}
static void TrackAgreementTransactionProtocol(ref bool everyoneAgrees, TransactionProtocol option,
ref TransactionProtocol agreedOption, ref bool anOperationCares)
{
if (!anOperationCares)
{
// this is the first operation to express a preference
agreedOption = option;
anOperationCares = true;
// everyoneAgrees is still true
}
else
{
if (option != agreedOption)
everyoneAgrees = false;
}
}
TransactionFlowOption GetOption(XmlElement elem, bool useLegacyNs)
{
try
{
if (IsRealOptionalTrue(elem) || (useLegacyNs && IsLegacyOptionalTrue(elem)))
{
return TransactionFlowOption.Allowed;
}
return TransactionFlowOption.Mandatory;
}
catch (FormatException e)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException(
SR.GetString(SR.UnsupportedBooleanAttribute, TransactionPolicyStrings.OptionalLocal, e.Message)));
}
}
static bool IsRealOptionalTrue(XmlElement elem)
{
string value12 = elem.GetAttribute(TransactionPolicyStrings.OptionalLocal, MetadataStrings.WSPolicy.NamespaceUri);
string value15 = elem.GetAttribute(TransactionPolicyStrings.OptionalLocal, MetadataStrings.WSPolicy.NamespaceUri15);
return XmlUtil.IsTrue(value12) || XmlUtil.IsTrue(value15);
}
static bool IsLegacyOptionalTrue(XmlElement elem)
{
string valueLegacy = elem.GetAttribute(TransactionPolicyStrings.OptionalLocal, TransactionPolicyStrings.OptionalNamespaceLegacy);
return XmlUtil.IsTrue(valueLegacy);
}
TransactionFlowBindingElement EnsureBindingElement(PolicyConversionContext context)
{
TransactionFlowBindingElement settings = context.BindingElements.Find<TransactionFlowBindingElement>();
if (settings == null)
{
settings = new TransactionFlowBindingElement(false);
context.BindingElements.Add(settings);
}
return settings;
}
}
}
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