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//=============================================================================
/**
* @file DLL_Parser.h
*
* $Id$
*
* @author Carlos O'Ryan (coryan@cs.wustl.edu)
*/
//=============================================================================
#ifndef TAO_DLL_PARSER_H
#define TAO_DLL_PARSER_H
#include "ace/pre.h"
#include "tao/IOR_Parser.h"
#include "ace/Service_Config.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
/**
* @class TAO_DLL_Parser
*
* @brief Implment the parser for the DLL-style IORs.
*
* The DLL-style IORs allows applications to transparently load object
* implementations. The ORB can parse an IOR in the format:
*
* DLL:Service_Name
*
* the string_to_object() function will use ACE's Service Configurator
* to dynamically load the service named 'Service_Name'. The ORB
* assumes that this service implements the TAO_Object_Loader
* interface, and uses that interface to create a new object
* implementation locally. The object reference for this local object
* is returned to the application.
*
* This can be used in applications that sometimes require local
* object while other times they may use a remote implementation.
* For example, the application could be configured to use a remote
* Event Service or to dynamically load an Event Service
* implementation and use the local copy instead. The local Event
* Service would federate to its remote peers to work as-if a single
* Event Service was in place.
*
* Such an application could be written as follows:
*
* int main (int argc, char* argv)
* {
* CORBA::ORB_var orb = CORBA::ORB_init(argc, argv);
*
* CORBA::Object_var object =
* orb->resolve_initial_references("EventService");
* // Use <object> here...
* }
*
* if the application is invoked using:
*
* $ program -ORBInitRef EventService=IOR:....
*
* then a remote event service is used, but the application could also
* be invoked using:
*
* $ program -ORBInitRef EventService=DLL:Event_Service_Loader
*
* In this case the Event_Service implementation will be dynamically
* loaded without any modifications to the application code.
*
*/
class TAO_Export TAO_DLL_Parser : public TAO_IOR_Parser
{
public:
/// Constructor
TAO_DLL_Parser (void);
/// The destructor
virtual ~TAO_DLL_Parser (void);
// = The IOR_Parser methods, please read the documentation in
// IOR_Parser.h
virtual int match_prefix (const char *ior_string) const;
virtual CORBA::Object_ptr parse_string (const char *ior,
CORBA::ORB_ptr orb,
CORBA::Environment &)
ACE_THROW_SPEC ((CORBA::SystemException));
};
#if defined (__ACE_INLINE__)
# include "DLL_Parser.i"
#endif /* __ACE_INLINE__ */
ACE_STATIC_SVC_DECLARE_EXPORT (TAO, TAO_DLL_Parser)
ACE_FACTORY_DECLARE (TAO, TAO_DLL_Parser)
#include "ace/post.h"
#endif /* TAO_DLL_PARSER_H */
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