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// This may look like C, but it's really -*- C++ -*-
// $Id$
//=================================================================================
//
// = LIBRARY
// TAO/examples/POA/On_Demand_Loading
//
// = FILENAME
// Servant_Activator.h
//
// = DESCRIPTION
// Defines a <ServantActivator_i> class, which uses a
// Servant_Manager to activate a servant by loading it and
// associates it with an object on-demand.
//
// = AUTHOR
// Kirthika Parameswaran <kirthika@cs.wustl.edu>
//
//==================================================================================
#ifndef SERVANT_ACTIVATOR_H
#define SERVANT_ACTIVATOR_H
#include "Servant_Manager.h"
class ServantActivator_i : public POA_PortableServer::ServantActivator
{
//= TITLE
// Servant Activator for the MyFoo servant.
//
//= DESCRIPTION
// This class associates an unassociated servant with an object in
// the POA Active Object Map.
public:
ServantActivator_i (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
// MyFooServant object that is not currently active. When an servant
// pointer corresponding to objectId is not found in the Active
// Object Map, the POA hands over the job of obtaining the servant
// to the Servant Manager. Depending upon whether the POA is created
// with RETAIN or NON_RETAIN as the servant_retention policy, the
// Servant Activator or the Servant Locator interface is invoked
// respectively.
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. This occurs when the POA is destroyed or the
// Object is deactivated. When the POA is getting destroyed, it
// needs to deactivate every object in the Active Object Map and on
// that call the ServantActivator invokes this method which will
// destroy the servant associated with the object.
PortableServer::ObjectId_var create_dll_object_id (const char *dllname,
const char *factory_function);
// Returns an ObjectId when given a DLL name and the factory
// function in the DLL that will create an appropriate Servant.
private:
ServantManager_i servant_manager_;
// An ServantManager object that provides utility methods. The
// methods include obtaining the servant using an ACE_DLL object,
// destroying the servant and extracting the dllname and factory
// function from the ObjectId.
};
#endif /* SERVANT_ACTIVATOR_H */
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