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while (where != m_assetsend()) { if (num_found == 0) { // First match overwrites reference // in search record slist[i]device = where->second->_this(); } else { // Each further match appends a new // element to the search sequence CORBA::ULong len = slistlength(); slistlength(len + 1); slist[len]key = slist[i]key; slist[len]device = where->second->_this(); } num_found++; // Find next matching device with this key where = find_if( ++where, m_assetsend(), StrFinder(sc, search_str) );
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We designed the find operation this way because it illustrates two important points If you look at the implementation code, you will find that it is remarkably free of CORBA artifacts The code is complex because of the complex data types and semantics and not because we are using CORBA In other words, the implementation would be equally complex using non-CORBA types At the IDL level, things look deceptively simple It is tempting to create operations that do too much or to use operations that manipulate deeply nested data structures As we suggest in 5, doing this is almost always an indication of poor design And as you can see, when it comes to implementing such operations, you pay the price Defining the find operation as we do also gives us a convenient excuse to illustrate use of deeply nested IDL types If you can understand the preceding example, you should be able to understand anything you are likely to encounter in real-life applications (which will be less complex if they are well designed)
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1010 Implementing the Server main Function
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The server's main function is similar to what we saw in 3 The server initializes the ORB run time, obtains the Root POA, creates a servant manager, and activates the manager The code then instantiates the controller singleton and sets its pointer in the static member Thermometer_impl::m_ctrl before writing the controller reference to the standard output At this point, the controller servant is initialized and the code instantiates a number of thermometer and thermostat servants
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Finally, the server calls run, which starts the event loop so that the server can accept requests
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int main(int argc, char * argv[]) { try { // Initialize orb CORBA::ORB_var orb = CORBA::ORB_init(argc, argv); // Get reference to Root POA CORBA::Object_var obj = orb->resolve_initial_references("RootPOA"); PortableServer::POA_var poa = PortableServer::POA::_narrow(obj); // Activate POA manager PortableServer::POAManager_var mgr = poa->the_POAManager(); mgr->activate(); // Create a controller and set static m_ctrl member // for thermostats and thermometers Controller_impl ctrl_servant; Thermometer_impl::m_ctrl = &ctrl_servant; // Write controller stringified reference to stdout CCS::Controller_var ctrl = ctrl_servant_this (); CORBA::String_var str = orb->object_to_string (ctrl); cout < str < endl < endl; // Create a few devices (Thermometers have odd asset // numbers, thermostats have even asset numbers) Thermometer_impl thermo1(2029, "Deep Thought"); Thermometer_impl thermo2(8053, "HAL"); Thermometer_impl thermo3(1027, "ENIAC"); Thermostat_impl tmstat1(3032, "Colossus", 68); Thermostat_impl tmstat2(4026, "ENIAC", 60); Thermostat_impl tmstat3(4088, "ENIAC", 50); Thermostat_impl tmstat4(8042, "HAL", 40); // Accept requests orb->run();
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} catch (const CORBA::Exception & e) { cerr < "Uncaught CORBA exception: " < e < endl; return 1; } catch () { abort(); // Unexpected exception, dump core } return 0;
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Compiling, linking, and running the server proceeds as we show in 3, so we do not repeat these steps here
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1011 The Complete Server Code
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The complete code for the server is listed here once more for your reference For simplicity, the entire code is distributed over only two files: serverhh and servercc For a production-quality application, you would probably choose a finergrained distribution over source files for maintainability (See [11] for excellent advice on how to choose an appropriate file structure) 10111 The serverhh Header File
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#ifndef server_HH_ #define server_HH_ #include <map> #include <stdlibh> #include "CCSShh" class Controller_impl; class Thermometer_impl : public virtual POA_CCS::Thermometer { public: // CORBA attributes virtual CCS::ModelType model() throw(CORBA::SystemException); virtual CCS::AssetType asset_num() throw(CORBA::SystemException); virtual CCS::TempType temperature() throw(CORBA::SystemException); virtual CCS::LocType location() throw(CORBA::SystemException); virtual void location(const char * loc) throw(CORBA::SystemException); // Constructor and destructor Thermometer_impl(CCS::AssetType anum, const char * location); virtual ~Thermometer_impl(); static Controller_impl * protected: const CCS::AssetType m_ctrl; // My controller m_anum; // My asset number
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private: // Helper functions CCS::ModelType get_model(); CCS::TempType get_temp(); CCS::LocType get_loc(); void set_loc(const char * new_loc); // Copy and assignment not supported
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