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// -*- C++ -*-
//=============================================================================
/**
* @file Connect_Strategy.h
*
* $Id$
*
* @author Balachandran Natarajan <bala@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_CONNECT_STRATEGY_H
#define TAO_CONNECT_STRATEGY_H
#include /**/ "ace/pre.h"
#include "tao/TAO_Export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "tao/Versioned_Namespace.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
class ACE_Synch_Options;
class ACE_Time_Value;
ACE_END_VERSIONED_NAMESPACE_DECL
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
class TAO_ORB_Core;
class TAO_Connector;
class TAO_Connection_Handler;
class TAO_Transport;
class TAO_LF_Multi_Event;
class TAO_LF_Event;
/**
* @class TAO_Connect_Strategy
*
* @brief Define the interface for the connect strategy, i.e. the
* algorithm that controls how does the ORB establishes remote
* connections.
*
* The thread that establishes remote connections can either make a
* blocking or a non-blocking connect. The strategy to wait for the
* connection completion can also be different.
*
* This strategy controls how does the ORB schedules and waits for
* connection completion.
*/
class TAO_Export TAO_Connect_Strategy
{
public:
/// Constructor
TAO_Connect_Strategy (TAO_ORB_Core *orb);
/// Destructor
virtual ~TAO_Connect_Strategy (void);
/// Obtain the synch options that can be passed to ACE_Connector
/* Return the synch option for the connector, based on the timeout
* and the strategy in place. ACE_Connectors behavior can be altered
* by passing the right ACE_Synch_Options to the connect () call.
*/
virtual void synch_options (ACE_Time_Value *val,
ACE_Synch_Options &opt) = 0;
/// Wait for the connection to be completed till a timeout occurs.
/* If the connection establishment fails the state within the
* connection handler is set appropriately.
*/
int wait (TAO_Connection_Handler *ch, ACE_Time_Value *val);
int wait (TAO_Transport *t, ACE_Time_Value *val);
/// Wait for one of many connections to complete. Returns when one
/// succeeds or all fail.
int wait (TAO_LF_Multi_Event *ev, ACE_Time_Value *val);
/// Do a quick check to see if any connections are complete. This
/// does the same as the wait with an explicit time value of 0.
int poll (TAO_LF_Multi_Event *ev);
protected:
/// This is the method that does all the real interesting stuff.
virtual int wait_i (TAO_LF_Event *ev,
TAO_Transport *t,
ACE_Time_Value *val) = 0;
/// Cached copy of the ORB core pointer
TAO_ORB_Core * const orb_core_;
};
TAO_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /*TAO_CONNECT_STRATEGY_H*/
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