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if (!afile) { cerr < < "Cannot open " < < m_asset_file < < endl; throw 0; } CCS::AssetType anum; while (afile >> anum) m_assets[anum] = 0; afileclose(); if (!afile) { cerr < < "Cannot close " < < m_asset_file < < endl; throw 0; }
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Note that the file name is passed to the constructor and is remembered in the private member variable m_asset_file (We return to the purpose of the m_poa member shortly) The constructor iterates over the input file (creating it if necessary) and inserts each asset number into the m_assets map with a null servant pointer This action initializes the m_assets map with all known asset numbers However, no servants are instantiated at this point Instead, an asset number with a null servant pointer indicates that the device exists but has no servant in memory The controller's destructor runs when the server shuts down and writes the known asset numbers back to the file:
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Controller_impl:: ~Controller_impl() { // Write out the current set of asset numbers // and clean up all servant instances ofstream afile(m_asset_file); if (!afile) { cerr < < "Cannot open " < < m_asset_file < < endl; abort(); } AssetMap::iterator i; for (i = m_assetsbegin(); i != m_assetsend(); i++) { afile < < i->first < < endl; if (!afile) { cerr < < "Cannot update " < < m_asset_file < < endl; abort(); } delete i->second; } afileclose(); if (!afile) { cerr < < "Cannot close " < < m_asset_file < < endl; abort(); } }
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IT-SC book: Advanced CORBA Programming with C++
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Note that the loop also deletes each instantiated servant (If a servant pointer is null, the delete does nothing) This technique ensures that the destructor for all instantiated servants is invoked so that servants can properly finalize their state before the server shuts down For this example, we are using the combined collection and factory approach we describe on page 533, in which the controller offers a creation operation for each type of device (The implementation of the factory operations for the other options we discussed is very similar) Here is the code for create_thermometer:
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CCS::Thermometer_ptr Controller_impl:: create_thermometer(CCS::AssetType anum, const char * loc) throw(CORBA::SystemException, CCS::Controller::DuplicateAsset) { // Make sure the asset number is new if (exists(anum)) throw CCS::Controller::DuplicateAsset(); // Add the device to the network and program its location if (ICP_online(anum) != 0) abort(); if (ICP_set(anum, "location", loc) != 0) abort(); // Add the new device to the m_assets map add_impl(anum, 0); // Create an object reference for the device and return it return make_dref(m_poa, anum);
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The code first checks whether a device having the asset number passed in already exists If it does, the code throws a DuplicateAsset exception (The exists function is a simple helper function that returns true if the asset number passed to it is in the m_assets map) The next step is to inform the ICP network of the existence of the new device and to program its location string Next, the code adds an entry for the new device to the m_assets map, storing a null pointer to the servant In other words, the factory does not immediately instantiate a servant for the new device but instead delays instantiation until the first operation is invoked (You will see how this works in Section 126) The final step is to call the make_dref helper function, which creates an object reference for the new device Here is the code for make_dref:
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static CCS::Thermometer_ptr make_dref(PortableServer::POA_ptr poa, CCS::AssetType anum) { // Convert asset number to OID ostrstream ostr; ostr < < anum < < ends; char * anum_str = ostrstr(); PortableServer::ObjectId_var oid = PortableServer::string_to_ObjectId(anum_str);
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IT-SC book: Advanced CORBA Programming with C++
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ostrrdbuf()->freeze(0); // Look at the model via the network to determine // the repository ID char buf[32]; if (ICP_get(anum, "model", buf, sizeof(buf)) != 0) abort(); const char * rep_id = strcmp(buf, "Sens-A-Temp") == 0 "IDL:acmecom/CCS/Thermometer:10" : "IDL:acmecom/CCS/Thermostat:10";: "IDL:acmecom/CCS/Thermostat:10"; // Make a new reference CORBA::Object_var obj = poa->create_reference_with_id(oid, rep_id); return CCS::Thermometer::_narrow(obj);
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The make_dref function merely encapsulates similar code that is shown in 11 Note that we pass to make_dref an object reference to the POA for the new servant That POA reference in turn is remembered by the controller's constructor, shown on page 543 Looking at create_thermometer and make_dref, you can see that very little work is actually required to create a new object The factory simply informs the network of the new device, updates the controller's notion of what devices exist, and creates an object reference for the new device The implementation of create_thermostat is similar The main difference is that we must check whether the initial temperature setting is in range and that we must narrow the reference returned by make_dref to the correct type:
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CCS::Thermostat_ptr Controller_impl:: create_thermostat( CCS::AssetType anum, const char * loc, CCS::TempType temp ) throw( CORBA::SystemException, CCS::Controller::DuplicateAsset, CCS::Thermostat::BadTemp) { // Make sure the asset number is new if (exists(anum)) throw CCS::Controller::DuplicateAsset(); // Add the device to the network and program its location if (ICP_online(anum) != 0) abort(); if (ICP_set(anum, "location", loc) != 0) abort();
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