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// This may look like C, but it's really -*- C++ -*-
//=============================================================================
/**
* @file Servant_Activator.h
*
* Defines a <ServantActivator> class, which activates a servant by
* obtaining 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 "tao/PortableServer/PortableServer.h"
#include "tao/PortableServer/ServantActivatorC.h"
#include "tao/LocalObject.h"
#include "tao/ORB.h"
#include "ace/DLL.h"
#include "ace/Log_Msg.h"
/**
* Servant Activator for the test servant.
*
* This class associates an unassociated servant with an object in
* the POA Active Object Map.
*/
class ServantActivator :
public virtual PortableServer::ServantActivator,
public virtual ::CORBA::LocalObject
{
public:
/**
* This typedef is used to typecast the void* obtained when finding
* a symbol in the dll. Invoking the function pointer obtained would
* get a servant.
*/
typedef PortableServer::Servant
(*SERVANT_FACTORY) (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr poa,
CORBA::ORB_ptr orb);
/**
* This typedef is used to obtain the garbage_collection_function symbol
* in the dll. Invoking the function pointer obtained would then destroy
* the servant.
*/
typedef void
(*SERVANT_GARBAGE_COLLECTOR) (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr,
PortableServer::Servant servant);
/// Initialization.
ServantActivator (CORBA::ORB_ptr orb,
const ACE_TCHAR *dllname,
const ACE_TCHAR *factory_function,
const ACE_TCHAR *garbage_collection_function);
/**
* This method is invoked by a POA with USE_SERVANT_MANAGER and
* RETAIN policies, whenever it receives a request for a
* test 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 PortableServer::Servant incarnate (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr poa);
/**
* This method is invoked whenever a test 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.
*/
virtual void etherealize (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr adapter,
PortableServer::Servant servant,
CORBA::Boolean cleanup_in_progress,
CORBA::Boolean remaining_activations);
private:
/// The ACE_DLL object which performs the task of loading the dll
/// and accessing it.
ACE_DLL dll_;
/// The function pointer of factory_function type.
SERVANT_FACTORY servant_supplier_;
/// The function pointer of garbage_collection_function type.
SERVANT_GARBAGE_COLLECTOR servant_garbage_collector_;
/// A reference to the ORB.
CORBA::ORB_var orb_;
};
#endif /* SERVANT_ACTIVATOR_H */
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