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// $Id$
//=================================================================================
//
// = LIBRARY
// TAO/tests/POA/On_Demand_Loading
//
// = FILENAME
// Servant_Activator.h
//
// = DESCRIPTION
// Defines a Dir_Service_Activator class which is an
// Servant_Manager interface which activates a servant by loading
// it and associates it with an object on demand.
//
// = AUTHOR
// Kirthika Parameswaran <kirthika@cs.wustl.edu>
//
//==================================================================================
#include "tao/corba.h"
#include "ace/DLL.h"
class Dir_Service_Activator : public POA_PortableServer::ServantActivator
{
//= TITLE
// Servant Activator for the directory service servant.
//
//= DESCRIPTION
// This class associates an unassociated servant with an object in
// the POA Active Object Map.
public:
typedef PortableServer::Servant (*Servant_Creator_Prototype) (CORBA::ORB_ptr orb, PortableServer::POA_ptr poa);
// This typedef is used to typecast the void* obtained on finding a
// symbol in the library.
Dir_Service_Activator (CORBA::ORB_ptr orb);
// Initialization.
virtual PortableServer::Servant incarnate (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr poa,
CORBA::Environment &env);
// This method is invoked by a POA with USE_SERVANT_MANAGER and
// RETAIN policies , whenever it receives a request for a MyFoo
// object that is not currently active.
virtual void etherealize (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr adapter,
PortableServer::Servant servant,
CORBA::Boolean cleanup_in_progress,
CORBA::Boolean remaining_activations,
CORBA::Environment &env);
// This method is invoked whenever a MyFooServant for a MyFoo object
// is deactivated.
private:
PortableServer::Servant activate_servant (const char *str,
PortableServer::POA_ptr poa);
// Gets the servant on activation by loading the appropriate library
// and getting the servant object.
void deactivate_servant (PortableServer::Servant servant);
// The servant is killed and take is taken to close the library
// loaded.
void parse_string (const char* s);
// Parse the string to obtain the library name and the symbol which
// will get us the servant pointer.
CORBA::ORB_var orb_;
// A reference to the ORB.
CORBA::String_var dllname_;
// the name of the library containing the servant.
CORBA::String_var create_symbol_;
// The symbol which on getting invoked will give us the servant
// pointer.
ACE_DLL dll_;
// the library object.
};
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