TAO/tests/POA/Loader/Servant_Activator.cpp

   1
   2 //=============================================================================
   3 /**
   4  *  @file     Servant_Activator.cpp
   5  *
   6  *   Implementation of <ServantActivator>, which is used by a POA
   7  *   with a RETAIN policy.
   8  *
   9  *  @author  Kirthika Parameswaran <kirthika@cs.wustl.edu>
  10  */
  11 //=============================================================================
  12
  13
  14 #include "Servant_Activator.h"
  15 #include "ace/OS_NS_string.h"
  16
  17 // Initialization.The dllname is used by the Loactor to load it into
  18 // memory. The factory function is the point of entry into the dll and
  19 // is used for obtaining the servant. The garbage_collection_function
  20 // is used to kill the servant.
  21
  22 ServantActivator::ServantActivator (CORBA::ORB_ptr orb,
  23                                     const ACE_TCHAR *dllname,
  24                                     const ACE_TCHAR *factory_function,
  25                                     const ACE_TCHAR *garbage_collection_function)
  26   : orb_ (CORBA::ORB::_duplicate (orb))
  27 {
  28   // The dll is opened using the dllname passed.
  29   if (this->dll_.open (dllname) == -1)
  30     ACE_ERROR ((LM_ERROR,
  31                 "%p\n",
  32                 this->dll_.error ()));
  33
  34   // Obtain the symbol for the function that will get the servant
  35   // object.
  36
  37   // Cannot go from void* to function pointer directly. Cast the void*
  38   // to long first.
  39   void *symbol = this->dll_.symbol (factory_function);
  40   intptr_t function = reinterpret_cast<intptr_t> (symbol);
  41
  42   servant_supplier_ =
  43     reinterpret_cast<SERVANT_FACTORY> (function);
  44
  45   // Obtain the symbol for the function which will destroy the
  46   // servant.
  47   symbol = this->dll_.symbol (garbage_collection_function);
  48   function = reinterpret_cast<intptr_t> (symbol);
  49   servant_garbage_collector_ =
  50     reinterpret_cast<SERVANT_GARBAGE_COLLECTOR> (function);
  51 }
  52
  53 // This method associates an servant with the ObjectID.
  54
  55 PortableServer::Servant
  56 ServantActivator::incarnate (const PortableServer::ObjectId &oid,
  57                              PortableServer::POA_ptr poa)
  58 {
  59   // Obtain the servant else exception.
  60   PortableServer::Servant servant =
  61     (*servant_supplier_) (oid,
  62                           poa,
  63                           this->orb_.in ());
  64   if (servant != 0)
  65     return servant;
  66   else
  67     throw CORBA::OBJECT_NOT_EXIST ();
  68 }
  69
  70 // This is the method invoked when the object is deactivated or the
  71 // entire POA is is deactivated or destroyed.
  72
  73 void
  74 ServantActivator::etherealize (const PortableServer::ObjectId &oid,
  75                                PortableServer::POA_ptr poa,
  76                                PortableServer::Servant servant,
  77                                CORBA::Boolean,
  78                                CORBA::Boolean remaining_activations)
  79 {
  80   // If there are no remaining activations i.e ObjectIds associated
  81   // with test servant, deactivate it by calling the
  82   // garbage_collection_function.  Etheralization happens on
  83   // POA::destroy() and/or Object::deactivate().
  84
  85   if (remaining_activations == 0)
  86     (*servant_garbage_collector_) (oid,
  87                                    poa,
  88                                    servant);
  89 }