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94 Servant Classes
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To create a CORBA object of type MyObject, you must derive a servant class from the POA_MyObject class and implement all pure virtual methods Consider the following servant class example:
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#include "my_objectShh" class MyObject_impl : public virtual POA_MyObject { public: MyObject_impl(CORBA::Long init_val) : m_value(init_val) {} virtual CORBA::Long get_value() throw(CORBA::SystemException); private: CORBA::Long m_value; // copy and assignment not needed MyObject_impl(const MyObject_impl &); void operator=(const MyObject_impl &);
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There are several important points to note about this servant class We assume that we use our IDL compiler to compile the file my_objectidl, containing the IDL definition of the MyObject interface, to produce the server-side header file my_objectShh (The name of the header file is not standardized, so the exact name will vary depending on the IDL compiler you use) We include this header file to obtain the declaration for the POA_MyObject base class The name chosen for the servant class, MyObject_impl, is entirely up to the application It can be any name at all, as long as it does not clash with any names reserved by the C++ mapping, such as those beginning with POA_ We follow the convention of naming our servant classes with an _impl suffix so that we can tell by looking at the class name that it is a servant class The MyObject_impl class inherits from the POA_MyObject skeleton as a virtual base class and overrides the pure virtual get_value function This makes MyObject_impl a concrete class that can be instantiated You are obliged to implement all inherited pure virtual functions in your servant class because otherwise the C++ compiler will not allow you to create instances of it Beyond that, you can add whatever else you consider useful to support the implementation of your servant class For example, you may want to add a constructor and destructor, additional member functions, or data members You can also add a protected or private section For this example, we have added a private data member called m_value of type CORBA::Long, and a constructor that initializes that member We have also made the copy constructor and default assignment operator private, thereby disallowing copying of
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our servant In practice, there is rarely a need to copy-construct or assign servants, so we recommend hiding the copy constructor and default assignment operator for your servant classes The implementation of the get_value method simply returns the m_value member:
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CORBA::Long MyObject_impl:: get_value() throw(CORBA::SystemException) { return m_value; }
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The implementation of get_value is so simple that no error conditions can arise, so it does not throw any exceptions Because our servant class inherits virtual functions, it must redeclare those functions exactly as they are declared in the generated skeleton base class, including all exception specifications Furthermore, the function names, signatures, and exception specifications for servant implementation definitions must exactly match their corresponding declarations If there are mismatches, they are most likely to hide, rather than override, the inherited skeleton operations; this means that your servant classes inherit pure virtual functions and therefore will not be concrete Getting these declarations and definitions correct can be error-prone, so many IDL compilers include options that cause them to generate empty servant class declarations and definitions If your IDL compiler supports such a feature, we highly recommend that you use it when writing your servant classes If it lacks this feature, we recommend that you cut and paste method declarations and implementations from the generated server-side files to avoid mistakes The MyObject_impl class is quite simple, and yet it is complete Instances of MyObject_impl are fully capable of incarnating CORBA objects of type MyObject
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To use an instance of the MyObject_impl servant class to incarnate a CORBA object, you must create a MyObject_impl servant, create a CORBA object, and register the servant as the incarnation of the CORBA object Note that merely creating a C++ servant does not imply the creation of a CORBA object; each of the two entities has its own separate, distinct lifetime To keep things simple, the following example shows the easiest way to simultaneously create both a C++ servant and a new CORBA object incarnated by that servant:
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// First create a servant instance MyObject_impl servant(42); // Next, create a new CORBA object and use our new servant // to incarnate it
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