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IT-SC book: Advanced CORBA Programming with C++
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Implementing the remove Operation with a Servant Locator
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For use with servant locators, remove is easy to implement:
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void Thermometer_impl:: remove() throw(CORBA::SystemException) { // Remove self from the m_assets map m_ctrl->remove_impl(m_anum); // Inform network that the device is gone if (ICP_offline(m_anum) != 0) abort(); }
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The code updates the controller's m_assets by deleting the entry corresponding to the device and informs the network that the device is now gone The servant locator performs the actual destruction of the servant in its postinvoke operation Any remaining state cleanup happens in the destructor of the servant:
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Thermometer_impl:: ~Thermometer_impl() { if (m_ctrl->exists(m_anum)) m_ctrl->add_impl(m_anum, 0); }
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// Clear servant pointer
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The destructor first checks whether there is still an entry for the servant in the controller's m_assets map If no entry is found, the destructor is being called as the result of a remove invocation from a client In that case, the CORBA object is already destroyed, and the destructor need not do any more work for this simple example (In a more complex application, the destructor of an object could perform further finalization of the persistent state, such as deleting memory for private data members or closing files) On the other hand, if the destructor still finds an entry for this servant in the m_assets map, only the C++ servant for the device is being destroyed, but the device itself still exists This happens if, for example, the CCS server shuts down In that case, we want to destroy only the servant but must not remove knowledge of the device's existence from the controller (The controller must still write the device's asset number into its persistent file) The destructor deals with this case by setting the device's servant pointer in the m_assets map to null but leaving the entry itself intact This indicates that the CORBA object still exists but no longer has a servant in memory Note that this version of remove is appropriate only for a single-threaded server, in which it is impossible for multiple requests to be executing concurrently ( 21 shows how to do this correctly in a multithreaded server) In fact, the code we show in this chapter assumes that the entire server application has only a single thread and that all POAs that host CCS objects have the SINGLE_THREAD_MODEL policy value The
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IT-SC book: Advanced CORBA Programming with C++
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reason we assume this is that our Thermometer and Thermostat servants must occasionally access data structures kept in our Controller servant As we explain in Section 1147, interactions among servants registered with different POAs may, depending on the ORB implementation, need to be prepared to deal with multithreading issues if the underlying server application is multithreaded This is because the ORB implementation might assign a separate thread to each POA even if all those POAs have the SINGLE_THREAD_MODEL policy value
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Implementing the remove Operation with a Servant Activator
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For use with servant activators, remove must be implemented differently Recall from 11 that a servant activator implies the RETAIN policy value on the POA, so the POA maintains the Active Object Map for us This means that the controller contains only a set of asset numbers instead of a map from asset numbers to servant pointers To correctly remove a device if we are using a servant activator, we must add another private data member to the Thermometer_impl class:
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class Thermometer_impl : public virtual POA_CCS::Thermometer { public: // As before private: bool m_removed; // To support remove() // Remainder as before };
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The m_removed member is initialized to false by the constructor of the class and is used by the servant activator We show how this works in a moment But first, here is the implementation of remove:
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void Thermometer_impl:: remove() throw(CORBA::SystemException) { // Make an OID for self ostrstream ostr; ostr < < m_anum < < ends; char * str = ostrstr(); PortableServer::ObjectId_var oid = PortableServer::string_to_ObjectId(str); ostr->rdbuf()freeze(0); poa->deactivate_object(oid); // Deactivate self
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// Remove device from m_assets set m_ctrl->remove_impl(m_anum); } m_removed = true; // Mark self as removed
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