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// -*- C++ -*-
//=============================================================================
/**
* @file LF_Strategy.h
*
* @author Carlos O'Ryan <coryan@uci.edu>
*/
//=============================================================================
#ifndef TAO_LF_STRATEGY_H
#define TAO_LF_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_Time_Value;
ACE_END_VERSIONED_NAMESPACE_DECL
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
class TAO_Leader_Follower;
/**
* @brief Strategize Leader/Follower manipulations in the ORB event
* loop.
*
* The ORB event loop must participate in the Leader/Followers
* protocol, but only if that concurrency model is configured,
* otherwise performance suffers.
*
* This class strategizes the ORB behavior in this respect.
*/
class TAO_Export TAO_LF_Strategy
{
public:
/// Destructor
virtual ~TAO_LF_Strategy (void);
/// The current thread will handle an upcall
/**
* Threads that handle requests can block for long periods of time,
* causing deadlocks if they don't elect a new leader before
* starting the upcall the system can become non-responsive or
* dead-lock.
*/
virtual void set_upcall_thread (TAO_Leader_Follower &) = 0;
/// The current thread is entering the reactor event loop
/**
* Threads that block in the reactor event loop become "server"
* threads for the Leader/Follower set. They must be flagged
* specially because they do not wait for one specific event, but
* for any event whatsoever.
*/
virtual int set_event_loop_thread (ACE_Time_Value *max_wait_time,
TAO_Leader_Follower &) = 0;
/// The current thread is leaving the event loop
/**
* When the thread leaves the event loop a new leader must be
* elected.
*/
virtual void reset_event_loop_thread (int call_reset,
TAO_Leader_Follower &) = 0;
};
TAO_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* TAO_LF_STRATEGY_H */
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