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// $Id$
// ============================================================================
//
// = LIBRARY
// TAO/examples/POA/Loader
//
// = FILENAME
// Servant_Locator.cpp
//
// = DESCRIPTION
// Implementation of ServantLocator_i class, used with a POA
// having a NON_RETAIN policy.
//
// = AUTHOR
// Kirthika Parameswaran <kirthika@cs.wustl.edu>
//
// ============================================================================
#include "Servant_Locator.h"
ACE_RCSID(Loader, Servant_Locator, "$Id$")
// Initialization.The dllname is used by the Loactor to load it into
// memory. The factory function is the point of entry into the dll and
// is used for obtaining the servant. The garbage_collection_function
// is used to kill the servant.
ServantLocator_i::ServantLocator_i (CORBA::ORB_ptr orb,
const char *dllname,
const char *factory_function,
const char *garbage_collection_function)
: orb_ (CORBA::ORB::_duplicate (orb))
{
// The dll is opened using the dllname passed.
if (this->dll_.open (dllname) == -1)
ACE_ERROR ((LM_ERROR,
"%p",
this->dll_.error ()));
// Obtain the symbol for the function that will get the servant
// object.
//
// Cannot go from void* to function pointer directly. Cast the void*
// to long first.
//
void *symbol = this->dll_.symbol (factory_function);
long function = ACE_reinterpret_cast (long, symbol);
servant_supplier_ =
ACE_reinterpret_cast (SERVANT_FACTORY, function);
// Obtain the symbol for the function which will destroy the
// servant.
symbol = this->dll_.symbol (garbage_collection_function);
function = ACE_reinterpret_cast (long, symbol);
servant_garbage_collector_ =
ACE_reinterpret_cast (SERVANT_GARBAGE_COLLECTOR, function);
}
// This method associates an servant with the ObjectID.
PortableServer::Servant
ServantLocator_i::preinvoke (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr poa,
const char * /* operation */,
PortableServer::ServantLocator::Cookie &cookie,
CORBA::Environment &ACE_TRY_ENV)
{
PortableServer::Servant servant =
(*servant_supplier_) (oid,
poa,
this->orb_.in ());
if (servant != 0)
{
// Return the servant as the cookie , used as a check when
// postinvoke is called on this ServantLocator_i.
cookie = servant;
return servant;
}
else
ACE_THROW_RETURN (CORBA::OBJECT_NOT_EXIST (),
0);
}
// Since the servant gets invoked per operation, the servant has to be
// destroyed per operation too. This is accomplished in the
// postinvoke method.
void
ServantLocator_i::postinvoke (const PortableServer::ObjectId &oid,
PortableServer::POA_ptr poa ,
const char * /* operation */,
PortableServer::ServantLocator::Cookie cookie,
PortableServer::Servant servant,
CORBA::Environment &/* env */)
{
// Check the passed servant with the cookie.
PortableServer::Servant my_servant =
ACE_reinterpret_cast (PortableServer::Servant,
cookie);
ACE_ASSERT (servant == my_servant);
// Invoke the garbage_collection_function.
(*servant_garbage_collector_) (oid,
poa,
servant);
// To avoid warning about unused variable with ACE_NDEBUG.
ACE_UNUSED_ARG (my_servant);
}
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