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//=============================================================================
/**
* @file Servant_Locator.h
*
* Defines a ServantLocator_i class , used with a POA having
* a NON_RETAIN policy.
*
* @author Kirthika Parameswaran <kirthika@cs.wustl.edu>
*/
//=============================================================================
#ifndef SERVANT_LOCATOR_H
#define SERVANT_LOCATOR_H
#include "ace/DLL.h"
#include "Servant_Manager.h"
#include "tao/PortableServer/ServantLocatorC.h"
#include "tao/LocalObject.h"
class ServantLocator_i :
public virtual PortableServer::ServantLocator,
public virtual ::CORBA::LocalObject
{
// = TITLE
// This class is used by a POA with USE_SERVANT_MANAGER and
// NON_RETAIN policy.
//
// = DESCRIPTION
// This class defines the Servant Locator interface of the Servant
// Manager. It is invoked when the POA has an USE_SERVANT_MANAGER
// policy and a servant_retention policy of NON_RETAIN type.
public:
/// Constructor.
ServantLocator_i (CORBA::ORB_ptr orb);
/**
* This method is invoked by a POA whenever it receives a request
* for test object that is not currently active. When the POA is
* created using the NON_RETAIN policy the Active Object Map is not
* maintained, in other words, an association between the ObjectId
* and the servant is not maintained. Hence every client request the
* servant has to be loaded. Note the operation argument. This
* argument specifies the operation to be invoked on the
* servant. The cookie helps in marking the servant. This marking is
* useful while destroying the servant.
*/
virtual PortableServer::Servant preinvoke (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr adapter,
const char *operation,
PortableServer::ServantLocator::Cookie &the_cookie);
/**
* This method is invoked whenever a test servant completes a
* request. As the Servant Loactor interface is used when the POA
* doesnt maintain the Active Object Map, its necessary to get rid
* of the servant after the client request has been processed. The
* appropriate servant is destroyed by verifying the cookie.Again
* this method is invoked per client request.
*/
virtual void postinvoke (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr adapter,
const char *operation,
PortableServer::ServantLocator::Cookie the_cookie,
PortableServer::Servant the_servant);
/// Returns an ObjectId when given an dll name and the factory method
/// to be invoked in the dll.
PortableServer::ObjectId_var create_dll_object_id (const char *dllname,
const char *factory_function);
private:
/**
* The <ServantManager_i> 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.
*/
ServantManager_i servant_manager_;
};
#endif /* SERVANT_LOCATOR_H */
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