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// This may look like C, but it's really -*- C++ -*-
// $Id$
// ============================================================================
//
// = LIBRARY
// TAO
//
// = FILENAME
// Transport_Mux_Strategy.h
//
// = DESCRIPTION
// IIOP Transport Mux Strategies.
//
// = AUTHOR
// Alexander Babu Arulanthu <alex@cs.wustl.edu>
//
// ============================================================================
#ifndef TAO_TRANSPORT_MUX_STRATEGY_H
#define TAO_TRANSPORT_MUX_STRATEGY_H
#include "tao/GIOP.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Functor.h"
#include "ace/Hash_Map_Manager.h"
class TAO_Reply_Dispatcher;
class TAO_Export TAO_Transport_Mux_Strategy
{
// = TITLE
//
// Strategy to determine whether the connection should be
// multiplexed for multiple requests or it is exclusive for a
// single request at a time.
//
// = DESCRIPTION
//
public:
TAO_Transport_Mux_Strategy (void);
// Base class constructor.
virtual ~TAO_Transport_Mux_Strategy (void);
// Base class destructor.
virtual CORBA::ULong request_id (void) = 0;
// Generate and return an unique request id for the current
// invocation.
// = Bind and Find methods for the <Request ID, ReplyDispatcher>
// pairs.
virtual int bind_dispatcher (CORBA::ULong request_id,
TAO_Reply_Dispatcher *rd) = 0;
// Bind the dispatcher with the request id.
virtual int dispatch_reply (CORBA::ULong request_id,
CORBA::ULong reply_status,
const TAO_GIOP_Version& version,
TAO_GIOP_ServiceContextList& reply_ctx,
TAO_GIOP_Message_State* message_state) = 0;
// Dispatch the reply for <request_id>, cleanup any resources
// allocated for that request.
// = "Factory methods" to obtain the CDR stream, in the Muxed case
// the factory simply allocates a new one, in the Exclusive case
// the factory returns a pointer to the pre-allocated CDR.
virtual TAO_GIOP_Message_State *get_message_state (void) = 0;
// Get a CDR stream.
virtual void destroy_message_state (TAO_GIOP_Message_State *) = 0;
// Destroy a CDR stream.
virtual int idle_after_send (TAO_Transport *) = 0;
// Request has been just sent, but the reply is not received. Idle
// the transport now.
virtual int idle_after_reply (TAO_Transport *) = 0;
// Request is sent and the reply is received. Idle the transport
// now.
virtual int reply_received (const CORBA::ULong request_id) = 0;
// Check whether the reply has been receieved for the request with
// <request_id>. Return 0 if no, 1 on yes and -1 if the request_id
// is invalid or there are some errors.
};
// *********************************************************************
class TAO_Export TAO_Exclusive_TMS : public TAO_Transport_Mux_Strategy
{
// = TITLE
//
// Connection exclusive for the request.
//
// = DESCRIPTION
//
public:
TAO_Exclusive_TMS (TAO_ORB_Core *orb_core);
// Constructor.
virtual ~TAO_Exclusive_TMS (void);
// Destructor.
virtual CORBA::ULong request_id (void);
// Generate and return an unique request id for the current
// invocation.
virtual int bind_dispatcher (CORBA::ULong request_id,
TAO_Reply_Dispatcher *rh);
// Bind the dispatcher with the request id.
virtual int dispatch_reply (CORBA::ULong request_id,
CORBA::ULong reply_status,
const TAO_GIOP_Version& version,
TAO_GIOP_ServiceContextList& reply_ctx,
TAO_GIOP_Message_State* message_state);
// Dispatch the reply for <request_id>, cleanup any resources
// allocated for that request.
virtual TAO_GIOP_Message_State *get_message_state (void);
// Return the pre-allocated message state.
virtual void destroy_message_state (TAO_GIOP_Message_State *);
// No op in this strategy.
virtual int idle_after_send (TAO_Transport *transport);
// Request has been just sent, but the reply is not received. Idle
// the transport now.
virtual int idle_after_reply (TAO_Transport *transport);
// Request is sent and the reply is received. Idle the transport
// now.
virtual int reply_received (const CORBA::ULong request_id);
// Check whether the reply has been receieved for the request with
// <request_id>. Return 0 if no, 1 on yes and -1 if the request_id
// is invalid or there are errors.
protected:
CORBA::ULong request_id_generator_;
// Used to generate a different request_id on each call to
// request_id().
CORBA::ULong request_id_;
// Request id for the current request.
TAO_Reply_Dispatcher *rd_;
// Reply Dispatcher corresponding to the request.
TAO_GIOP_Message_State message_state_;
// Message state to read the incoming message.
};
// *********************************************************************
class TAO_Export TAO_Muxed_TMS : public TAO_Transport_Mux_Strategy
{
// = TITLE
//
// Connection is multiplexed for many requests.
//
// = DESCRIPTION
//
public:
TAO_Muxed_TMS (TAO_ORB_Core *orb_core);
// Constructor.
virtual ~TAO_Muxed_TMS (void);
// Destructor.
virtual CORBA::ULong request_id (void);
// Generate and return an unique request id for the current
// invocation.
virtual int bind_dispatcher (CORBA::ULong request_id,
TAO_Reply_Dispatcher *rh);
// Bind the dispatcher with the request id.
virtual int dispatch_reply (CORBA::ULong request_id,
CORBA::ULong reply_status,
const TAO_GIOP_Version& version,
TAO_GIOP_ServiceContextList& reply_ctx,
TAO_GIOP_Message_State* message_state);
// Dispatch the reply for <request_id>, cleanup any resources
// allocated for that request.
virtual TAO_GIOP_Message_State *get_message_state (void);
// Return the message state.
virtual void destroy_message_state (TAO_GIOP_Message_State *);
// No op in this strategy.
virtual int idle_after_send (TAO_Transport *transport);
// Request has been just sent, but the reply is not received. Idle
// the transport now.
virtual int idle_after_reply (TAO_Transport *transport);
// Request is sent and the reply is received. Idle the transport
// now.
virtual int reply_received (const CORBA::ULong request_id);
// Check whether the reply has been receieved for the request with
// <request_id>. Return 0 if no, 1 on yes and -1 if the request_id
// is invalid or there are errors.
protected:
CORBA::ULong request_id_generator_;
// Used to generate a different request_id on each call to
// request_id().
ACE_SYNCH_MUTEX request_id_lock_;
// Lock to protect the state of the request id generator.
typedef ACE_Hash_Map_Manager_Ex <CORBA::ULong,
TAO_Reply_Dispatcher *,
ACE_Hash <CORBA::ULong>,
ACE_Equal_To <CORBA::ULong>,
ACE_SYNCH_MUTEX> REQUEST_DISPATCHER_TABLE;
REQUEST_DISPATCHER_TABLE dispatcher_table_;
// Table of <Request ID, Reply Dispatcher> pairs.
TAO_ORB_Core *orb_core_;
// Keep track of the orb core pointer. We need to this to create the
// Reply Dispatchers.
TAO_GIOP_Message_State *message_state_;
// Message state where the current input message is being read. This
// is created at start of each incoming message. When that message
// is read, the message is processed and for the next message a new
// message state is created.
};
// *********************************************************************
#endif /* TRANSPORT_MUX_STRATEGY_H */
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