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In general, skeletons are an implementation of the Adapter pattern documented in [4] The skeleton classes we describe in Section 93 rely on inheritance to adapt servant class interfaces to the request-dispatching interfaces expected by the ORB and the POA Using inheritance in this fashion is a realization of the class form of the Adapter pattern In this chapter we have used only skeletons that realize the class form of the Adapter pattern For completeness, we must also point out that servant classes that provide the other form of the Adapter pattern, called the object form, can also be generated by IDL compilers Such automatically generated servant classes are called tie classes In this section we briefly explain tie classes, describe how you can use them to incarnate CORBA objects, and then evaluate their usefulness 991 Details of Tie Classes A tie class is a C++ class template that you can instantiate to create a concrete servant A tie-based servant implements all methods by delegating them to another C++ object The tie class for our MyObject interface, originally defined in Section 93, the IDL compiler generates the following class definition
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template<class T>
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class POA_MyObject_tie : public POA_MyObject { public: // Constructors and destructor POA_MyObject_tie(T & tied_object); POA_MyObject_tie( T & tied_object, PortableServer::POA_ptr poa ); POA_MyObject_tie(T * tied_object, CORBA::Booleanrelease = 1); POA_MyObject_tie( T * tied_object, PortableServer::POA_ptr poa, CORBA::Boolean release = 1 ); ~POA_MyObject_tie(); // Functions to set T * _tied_object() void _tied_object(T void _tied_object(T and get tied object { return m_tied_object; } & obj); * obj, CORBA::Boolean release = 1);
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// Functions to set and check tied object ownership CORBA::Boolean _is_owner(); void _is_owner(CORBA::Boolean b); // Override IDL methods virtual CORBA::Long get_value() throw(CORBA::SystemException); // Override PortableServer::ServantBase operations PortableServer::POA_ptr _default_POA(); private: // Pointer to tied object T * m_tied_object; CORBA::Boolean m_owner; PortableServer::POA_var m_poa; // copy and assignment not allowed POA_MyObject_tie(const POA_MyObject_tie &); void operator=(const POA_MyObject_tie &);
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The tie class template looks more complicated than it really is To use a tie class, follow these steps Step 1 Instantiate the template with a class type that supplies a get_value member function Step 2 Create an instance of the instantiated tie template, passing its constructor a pointer or reference to an instance of the template parameter class type This template parameter class type instance is called the tied object because it is "tied" into the tie instance Step 3
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Register the tie instance with the POA as a servant for a CORBA object When the POA invokes the tie servant's get_value method to carry out a request, the tie servant merely delegates the invocation to its tied object, as shown here:
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template<class T> CORBA::Long POA_MyObject_tie<T>:: get_value() throw(CORBA::SystemException) { return m_tied_object->get_value(); }
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The rest of the member functions of the tie class template serve to set or get the tied object and help with managing its memory 992 Incarnation with Tie Servants To create a transient CORBA object using a tie servant, you can invoke _this on the tie instance, just as with any other servant However, you must ensure that before it receives any requests, the tie servant has a tied object to which it can delegate those requests When you register a tied object with a tie instance for delegation using either a tie class constructor or via the _tied_object modifier function you have two memory management options Step 1 You can maintain ownership of the tied object yourself Step 2 You can pass a true value for the release parameter of the appropriate constructor or of the _tied_object modifier function The tie instance will adopt the tied object and call delete on it in its destructor In the following example we show how to use a tied object and a tie instance together to implement a servant We first create the tied object and then pass a pointer to it to the tie constructor In this example we have decided to allocate the tied object on the heap and have the tie servant adopt it We then invoke _this on the tie servant to create a new CORBA object and register the tie servant as its implementation, as with the preceding example
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// Create a C++ class instance to be our tied object // Assume MyLegacyClass also supports the get_value() method MyLegacyClass * tied_object = new MyLegacyClass; // Create an instance of the tie class template, using // MyLegacyClass as the template parameter Pass our tied_object // pointer to set the tied object The release parameter defaults // to true, so the tie_servant adopts the tied_object POA_MyObject_tie<MyLegacyClass> tie_servant(tied_object); // Create our object and register our tie_servant as its servant
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