public void DeserializeExecutePolicyRequest() { string testFileName = Path.Combine(testMessageFolder, "ExecutePolicyRequest.xml"); DataContractSerializer serializer = new DataContractSerializer(typeof(RulesEngineRequest)); using (FileStream fileStream = new FileStream(testFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { XmlReaderSettings readerSettings = new XmlReaderSettings() { CheckCharacters = false, IgnoreComments = true, IgnoreProcessingInstructions = true, IgnoreWhitespace = true, ValidationType = ValidationType.None }; XmlReader xmlFileReader = XmlReader.Create(fileStream, readerSettings); while (!xmlFileReader.EOF && xmlFileReader.Name != WellKnownContractMember.MessageParameters.Request && xmlFileReader.NamespaceURI != WellKnownNamespace.DataContracts.General) { xmlFileReader.Read(); } Assert.IsFalse(xmlFileReader.EOF, "Unexpected end of file"); if (!xmlFileReader.EOF) { RulesEngineRequest request = serializer.ReadObject(xmlFileReader, false) as RulesEngineRequest; Assert.IsNotNull(request, "request is null"); Assert.IsFalse(String.IsNullOrEmpty(request.PolicyName)); Assert.IsNotNull(request.Facts); Assert.IsTrue(request.Facts.Count() == 2); PersistenceQueueItemBatchInfo batchInfo = null; PersistenceQueueItemInfo queueItemInfo = null; foreach (object fact in request.Facts) { if (fact is PersistenceQueueItemInfo) { queueItemInfo = fact as PersistenceQueueItemInfo; Assert.IsFalse(String.IsNullOrEmpty(queueItemInfo.QueueItemType)); Assert.IsFalse(queueItemInfo.QueueItemId == default(Guid)); } else if (fact is PersistenceQueueItemBatchInfo) { batchInfo = fact as PersistenceQueueItemBatchInfo; } } Assert.IsNotNull(batchInfo); Assert.IsNotNull(queueItemInfo); } } }
/// <summary> /// Executes the specified BRE policy using zero or more facts. /// </summary> /// <typeparam name="T">The type of the result expected from the BRE policy.</typeparam> /// <param name="policyName">The name of the BRE policy that needs to be invoked.</param> /// <param name="facts">Zero or more facts that will be submitted to the policy for evaluation.</param> /// <returns>The instance of an object carrying the result of policy execution, or null reference if the policy was not fired successfully.</returns> public T ExecutePolicy <T>(string policyName, params object[] facts) where T : class, new() { Guard.ArgumentNotNullOrEmptyString(policyName, "policyName"); var callToken = TraceManager.WorkerRoleComponent.TraceIn(policyName); try { RulesEngineRequest request = new RulesEngineRequest(policyName); request.AddFacts(new T()); if (facts != null) { request.AddFacts(facts); } using (var rulesEngineClient = new ReliableServiceBusClient <IOnPremiseRulesEngineServiceChannel>(roleConfigExtension.OnPremiseRelayTwoWayEndpoint, roleConfigExtension.CommunicationRetryPolicy)) { RulesEngineResponse response = rulesEngineClient.RetryPolicy.ExecuteAction <RulesEngineResponse>(() => { return(rulesEngineClient.Client.ExecutePolicy(request)); }); if (response.Success) { return((from fact in response.Facts where fact.GetType() == typeof(T) select fact).FirstOrDefault() as T); } else { return(default(T)); } } } catch (Exception ex) { // Report on any exceptions and return the default value of T, do not re-throw the exception to the caller. TraceManager.WorkerRoleComponent.TraceError(ex); return(default(T)); } finally { TraceManager.WorkerRoleComponent.TraceOut(callToken); } }
/// <summary> /// Synchronously executes the task using the specified <see cref="RuntimeTaskExecutionContext"/> execution context object. /// </summary> /// <param name="context">The execution context.</param> public override void Run(RuntimeTaskExecutionContext context) { Guard.ArgumentNotNull(context, "context"); Guard.ArgumentNotNull(context.Message, "context.Message"); var callToken = TraceManager.PipelineComponent.TraceIn(); Stream messageDataStream = null; IEnumerable <object> facts = null; string policyName = PolicyName, ctxPropName = null, ctxPropNamespace = null; Version policyVersion = PolicyVersion; RulesEngineRequest request = null; bool responseRequired = true; try { XmlReaderSettings readerSettings = new XmlReaderSettings() { CloseInput = false, CheckCharacters = false, IgnoreComments = true, IgnoreProcessingInstructions = true, IgnoreWhitespace = true, ValidationType = ValidationType.None }; if (context.Message.BodyPart != null) { messageDataStream = BizTalkUtility.EnsureSeekableStream(context.Message, context.PipelineContext); if (messageDataStream != null) { using (XmlReader messageDataReader = XmlReader.Create(messageDataStream, readerSettings)) { // Navigate through the XML reader until we find an element with the expected name and namespace. while (!messageDataReader.EOF && messageDataReader.Name != WellKnownContractMember.MessageParameters.Request && messageDataReader.NamespaceURI != WellKnownNamespace.DataContracts.General) { messageDataReader.Read(); } // Element was found, let's perform de-serialization from XML into a RulesEngineRequest object. if (!messageDataReader.EOF) { DataContractSerializer serializer = new DataContractSerializer(typeof(RulesEngineRequest)); request = serializer.ReadObject(messageDataReader, false) as RulesEngineRequest; if (request != null) { policyName = request.PolicyName; policyVersion = request.PolicyVersion; facts = request.Facts; } } } } } // Check if the policy name was supplied when this component was instantiated or retrieved from a request message. if (!String.IsNullOrEmpty(policyName)) { // If policy version is not specified, use the latest deployed version. PolicyExecutionInfo policyExecInfo = policyVersion != null ? new PolicyExecutionInfo(policyName, policyVersion) : new PolicyExecutionInfo(policyName); // Use all context properties as parameters when invoking a policy. for (int i = 0; i < context.Message.Context.CountProperties; i++) { ctxPropName = null; ctxPropNamespace = null; object ctxPropValue = context.Message.Context.ReadAt(i, out ctxPropName, out ctxPropNamespace); policyExecInfo.AddParameter(String.Format("{0}#{1}", ctxPropNamespace, ctxPropName), ctxPropValue); } // If we still haven't determined what facts should be passed to the policy, let's use the request message as a single fact. if (null == facts) { if (messageDataStream != null) { // Unwind the data stream back to the beginning. messageDataStream.Seek(0, SeekOrigin.Begin); // Read the entire message into a BRE-compliant type XML document. using (XmlReader messageDataReader = XmlReader.Create(messageDataStream, readerSettings)) { facts = new object[] { new TypedXmlDocument(Resources.DefaultTypedXmlDocumentTypeName, messageDataReader) }; responseRequired = false; } } } // Execute a BRE policy. PolicyExecutionResult policyExecResult = PolicyHelper.Execute(policyExecInfo, facts); // CHeck if we need to return a response. We don't need to reply back if we are not handling ExecutePolicy request message. if (responseRequired) { // Construct a response message. RulesEngineResponse response = new RulesEngineResponse(policyExecResult.PolicyName, policyExecResult.PolicyVersion, policyExecResult.Success); // Add all facts that were being used when invoking the policy. response.AddFacts(facts); // Create a response message. IBaseMessagePart responsePart = BizTalkUtility.CreateResponsePart(context.PipelineContext.GetMessageFactory(), context.Message); XmlWriterSettings settings = new XmlWriterSettings(); // Initialize a new stream that will hold the response message payload. MemoryStream dataStream = new MemoryStream(); context.PipelineContext.ResourceTracker.AddResource(dataStream); settings.CloseOutput = false; settings.CheckCharacters = false; settings.ConformanceLevel = ConformanceLevel.Fragment; settings.NamespaceHandling = NamespaceHandling.OmitDuplicates; using (XmlWriter responseWriter = XmlWriter.Create(dataStream, settings)) { responseWriter.WriteResponseStartElement("r", WellKnownContractMember.MethodNames.ExecutePolicy, WellKnownNamespace.ServiceContracts.General); DataContractSerializer dcSerializer = new DataContractSerializer(typeof(RulesEngineResponse), String.Concat(WellKnownContractMember.MethodNames.ExecutePolicy, WellKnownContractMember.ResultMethodSuffix), WellKnownNamespace.ServiceContracts.General); dcSerializer.WriteObject(responseWriter, response); responseWriter.WriteEndElement(); responseWriter.Flush(); } dataStream.Seek(0, SeekOrigin.Begin); responsePart.Data = dataStream; } else { if (facts != null) { TypedXmlDocument xmlDoc = facts.Where((item) => { return(item.GetType() == typeof(TypedXmlDocument)); }).FirstOrDefault() as TypedXmlDocument; if (xmlDoc != null) { // Initialize a new stream that will hold the response message payload. MemoryStream dataStream = new MemoryStream(); context.PipelineContext.ResourceTracker.AddResource(dataStream); XmlWriterSettings settings = new XmlWriterSettings { CloseOutput = false, CheckCharacters = false, ConformanceLevel = ConformanceLevel.Fragment, NamespaceHandling = NamespaceHandling.OmitDuplicates }; using (XmlWriter dataWriter = XmlWriter.Create(dataStream, settings)) { xmlDoc.Document.WriteContentTo(dataWriter); dataWriter.Flush(); } dataStream.Seek(0, SeekOrigin.Begin); context.Message.BodyPart.Data = dataStream; } } } } else { throw new ApplicationException(String.Format(CultureInfo.InvariantCulture, ExceptionMessages.PolicyNameNotSpecified)); } } finally { if (messageDataStream != null && messageDataStream.CanSeek && messageDataStream.Position > 0) { messageDataStream.Seek(0, SeekOrigin.Begin); } TraceManager.PipelineComponent.TraceOut(callToken); } }