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Let s say you want to use stack semantics, but you also need to get the instance back from a function call rather than creating it yourself. A typical example would be if a function call (sometimes referred to as an object factory) is used to create instances and return a handle to them. You can do this with an auto_handle, which is a handle that acts like an automatic variable. auto_handle is a managed template a template applied to a reference type. You ll read more about managed templates in 11. The auto_handle template takes one parameter: the type of the handle. Listing 4-18 shows an example. Listing 4-18. Using auto_handle // auto_handle.cpp #include <msclr\auto_handle.h> using namespace System; using namespace msclr; ref class DBConnection { public: bool Open() { // Open a database connection (actual code omitted). // ... return true; } void Close() { // Close the database connection. // ... } }; ref class PlantData { DBConnection^ connection; int id;

This solution describes the steps necessary to call the business rules engine from a C# assembly. The steps detail how to build a .NET Windows application to process job applications and dynamically

determine whether applicants meet a minimum age requirement. If the applicant is younger than a certain age, that person cannot be considered for employment. The minimum age is likely to change over time and needs to be easily configurable. The business rules engine that comes with BizTalk Server captures the business rule determining the minimum working age. Other recipes within this chapter detail the steps for creating rules.

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PlantData(int i) : id(i) { if (connection->Open() == true) { Console::WriteLine("Opened connection for id {0}.", id); } } public: static PlantData^ GetPlantData(int id) { return gcnew PlantData(id); } void Use() { Console::WriteLine("Using id {0}.", id); // Query database. // Update records, etc. } ~PlantData() { connection->Close(); Console::WriteLine("Closing connection for id {0}.", id); } }; // Using stack semantics: destructor called. void f_stack(int i) { auto_handle<PlantData> data = PlantData::GetPlantData(i); data->Use(); } int main() { f_stack(1); } The output verifies that the destructor is called when the auto_handle goes out of scope: Opened connection for id 1. Using id 1. Closing connection for id 1.

This solution assumes that a rule exists in the business rules engine to determine whether an applicant meets the minimum age requirements. To call this rule from a .NET application, follow these steps: 1. 2. Open the project containing the .NET application. Add a project reference to the Microsoft.RuleEngine.dll assembly, which contains the classes required to call the business rules engine. This may be in either $\Program Files\Common Files\Microsoft BizTalk or $\Program Files\Microsoft BizTalk Server 2010\. Create the necessary policy and fact objects, and execute the business rule policy, as shown in Listing 7 7.

Listing 7 7. Calling a Business Rule from .NET public void callSamplePolicy(ref System.Xml.XmlDocument newHireListDoc) { // create the SamplePolicy policy object // specify policy name and version Microsoft.RuleEngine.Policy policy = new Microsoft.RuleEngine.Policy("SamplePolicy", 1, 0); // create the facts object array to hold the input parameters for the policy object[] facts = new object[1]; // create the input parameter for the SamplePolicy policy // based on a typed BizTalk schema (fully qualified .NET type) Microsoft.RuleEngine.TypedXmlDocument typedXmlDoc = new Microsoft.RuleEngine.TypedXmlDocument("SampleSolution.NewHireList", newHireListDoc); // add the input parameter to the facts object array facts[0] = typedXmlDoc; // execute the policy against the facts policy.Execute(facts); policy.Dispose(); // set the parameter object newHireListDoc.LoadXml(typedXmlDoc.Document.OuterXml); }

So far in this chapter, you ve seen reference types and value types, and the many different ways of referring to objects in code. You ve learned the semantic differences between these methods, including objects with heap and stack semantics, tracking references, dereferencing handles, copying objects, lvalues, and the auto_handle template. Now focus will turn to how objects are passed to functions. As in classic C++, there are many ways to pass parameters, and it s important to know the semantic differences between all of them.

Although the business rules engine comes as part of BizTalk Server, this solution shows that .NET assemblies outside the BizTalk environment can call into it. This allows external applications to use the same rule framework that the integration hub does, enabling companies to consolidate their business rules functionality onto one platform.

Note You can extend this solution by using a web/WCF service method to access the business rules engine,

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