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// This may look like C, but it's really -*- C++ -*-
//=============================================================================
/**
* @file Wait_Strategy.h
*
* $Id$
*
* @author Alexander Babu Arulanthu <alex@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_WAIT_STRATEGY_H
#define TAO_WAIT_STRATEGY_H
#include "ace/pre.h"
#include "tao/corbafwd.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
class TAO_ORB_Core;
class TAO_Transport;
/**
* @class TAO_Wait_Strategy
*
* @brief Strategy for waiting for the reply.
*
*/
class TAO_Export TAO_Wait_Strategy
{
public:
/// Constructor.
TAO_Wait_Strategy (TAO_Transport *transport);
/// Destructor.
virtual ~TAO_Wait_Strategy (void);
/**
* The user is going to send a request, prepare any internal
* variables because the reply may arrive *before* the user calls
* wait.
*/
virtual int sending_request (TAO_ORB_Core *orb_core,
int two_way);
/// Base class virtual method. Wait till the <reply_received> flag is
/// true or the time expires.
virtual int wait (ACE_Time_Value *max_wait_time,
int &reply_received) = 0;
/// Register the handler needs with the reactor provided that it makes
/// sense for the strategy.
virtual int register_handler (void) = 0;
/// Returns a value to indicate whether the transport needs to set
/// the socket on which it is waiting to non-blocking mode or not.
virtual int non_blocking (void) = 0;
/**
* Return the TSS leader follower condition variable used in the
* Wait Strategy. Muxed Leader Follower implementation returns a
* valid condition variable, others return 0.
* The condition variable is acquired by the Reply_Dispatcher (when
* needed) in the thread that binds it to the right Transport.
* Later (when the reply is finally received) the Reply_Dispatcher
* passes this condition variable back to Waiting_Strategy, that can
* then signal the waiting thread if needed.
*/
virtual ACE_SYNCH_CONDITION *leader_follower_condition_variable (void);
/**
* This is the callback used by the Reply_Dispatcher to inform the
* Waiting_Strategy that a reply has been completely received, that
* it was already stored in the right place, and that the condition
* variable should be signalled if needed.
* The Waiting_Strategy must set the reply received flag, using
* whatever locks it needs.
*/
virtual int reply_dispatched (int &reply_received_flag,
ACE_SYNCH_CONDITION *);
/**
* The connection has been closed by the lower level components in
* the ORB.
* The wait has finished and must result in an error.
*/
virtual void connection_closed (int &reply_received_flag,
ACE_SYNCH_CONDITION*);
protected:
/// Transport object.
TAO_Transport *transport_;
};
#include "ace/post.h"
#endif /* TAO_WAIT_STRATEGY_H */
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