// -*- C++ -*-

// ===================================================================
/**
 *  @file   SHMIOP_Transport.h
 *
 *  $Id: SHMIOP_Transport.h 84272 2009-01-30 11:58:40Z johnnyw $
 *
 *  @author Nanbor Wang <nanbor@cs.wustl.edu>
 *  @author Balachandran Natarajan <bala@cs.wustl.edu>
 */
// ===================================================================

#ifndef TAO_SHMIOP_TRANSPORT_H
#define TAO_SHMIOP_TRANSPORT_H

#include /**/ "ace/pre.h"

#include "tao/orbconf.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#if defined (TAO_HAS_SHMIOP) && (TAO_HAS_SHMIOP != 0)

#include "tao/Strategies/strategies_export.h"
#include "ace/Svc_Handler.h"
#include "ace/MEM_Stream.h"
#include "tao/Transport.h"

#if defined ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION_EXPORT
template class TAO_Strategies_Export ACE_Svc_Handler<ACE_MEM_STREAM, ACE_NULL_SYNCH>;
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION_EXPORT */

TAO_BEGIN_VERSIONED_NAMESPACE_DECL

class TAO_SHMIOP_Connection_Handler;
class TAO_Target_Specification;
class Tao_Operation_Details;

typedef ACE_Svc_Handler<ACE_MEM_STREAM, ACE_NULL_SYNCH>
         TAO_SHMIOP_SVC_HANDLER;

/**
 * @class TAO_SHMIOP_Transport
 *
 * @brief Specialization of the base TAO_Transport class to handle the
 *  SHMIOP protocol.
 *
 */

class TAO_Strategies_Export TAO_SHMIOP_Transport : public TAO_Transport
{
public:

  /// Constructor.
  TAO_SHMIOP_Transport (TAO_SHMIOP_Connection_Handler *handler,
                        TAO_ORB_Core *orb_core);

  /// Default destructor.
  ~TAO_SHMIOP_Transport (void);

protected:
  /**
   * @name Overridden Template Methods
   *
   * These are implementations of template methods declared by TAO_Transport.
   */
  //@{
  virtual ACE_Event_Handler * event_handler_i (void);
  virtual TAO_Connection_Handler *connection_handler_i (void);

  /// Write the complete Message_Block chain to the connection.
  virtual ssize_t send (iovec *iov, int iovcnt,
                        size_t &bytes_transferred,
                        const ACE_Time_Value *timeout = 0);

  /// Read len bytes from into buf.
  virtual ssize_t recv (char *buf,
                        size_t len,
                        const ACE_Time_Value *s = 0);

  virtual int handle_input (TAO_Resume_Handle &rh,
                            ACE_Time_Value *max_wait_time);
  //@}

public:
  /// @todo These methods IMHO should have more meaningful names.
  /// The names seem to indicate nothing.
  virtual int send_request (TAO_Stub *stub,
                            TAO_ORB_Core *orb_core,
                            TAO_OutputCDR &stream,
                            TAO_Message_Semantics message_semantics,
                            ACE_Time_Value *max_wait_time);

  virtual int send_message (TAO_OutputCDR &stream,
                            TAO_Stub *stub = 0,
                            TAO_Message_Semantics message_semantics = TAO_TWOWAY_REQUEST,
                            ACE_Time_Value *max_time_wait = 0);

private:
  /// The connection service handler used for accessing lower layer
  /// communication protocols.
  TAO_SHMIOP_Connection_Handler *connection_handler_;
};

TAO_END_VERSIONED_NAMESPACE_DECL

#endif /* TAO_HAS_SHMIOP && TAO_HAS_SHMIOP != 0 */

#include /**/ "ace/post.h"

#endif /* TAO_SHMIOP_TRANSPORT_H */
