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// -*- C++ -*-
//=============================================================================
/**
* @file LB_LeastLoaded.h
*
* $Id$
*
* @author Ossama Othman <ossama@uci.edu>
*/
//=============================================================================
#ifndef LB_LEAST_LOADED_H
#define LB_LEAST_LOADED_H
#include "ace/pre.h"
#include "LB_LoadMap.h"
# if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
# endif /* ACE_LACKS_PRAGMA_ONCE */
#include "orbsvcs/CosLoadBalancingS.h"
#include "ace/Synch.h"
/**
* @class TAO_LB_LeastLoaded
*
* @brief "Least loaded" load balancing strategy
*
* This load balancing strategy is designed to select an object group
* member residing at a location with the smallest load.
*/
class TAO_LoadBalancing_Export TAO_LB_LeastLoaded
: public virtual POA_CosLoadBalancing::Strategy
{
public:
typedef TAO_LB_LoadMap LoadMap;
/// Constructor.
TAO_LB_LeastLoaded (void);
/// Destructor
~TAO_LB_LeastLoaded (void);
/**
* @name CosLoadBalancing::Strategy methods
*
* Methods required by the CosLoadBalancing::Strategy interface.
*/
//@{
virtual char * name (ACE_ENV_SINGLE_ARG_DECL_WITH_DEFAULTS)
ACE_THROW_SPEC ((CORBA::SystemException));
virtual CosLoadBalancing::Properties * get_properties (
ACE_ENV_SINGLE_ARG_DECL_WITH_DEFAULTS)
ACE_THROW_SPEC ((CORBA::SystemException));
virtual void push_loads (
const PortableGroup::Location & the_location,
const CosLoadBalancing::LoadList & loads
ACE_ENV_ARG_DECL_WITH_DEFAULTS)
ACE_THROW_SPEC ((CORBA::SystemException,
CosLoadBalancing::StrategyNotAdaptive));
virtual CORBA::Object_ptr next_member (
PortableGroup::ObjectGroup_ptr object_group,
CosLoadBalancing::LoadManager_ptr load_manager
ACE_ENV_ARG_DECL_WITH_DEFAULTS)
ACE_THROW_SPEC ((CORBA::SystemException,
PortableGroup::ObjectGroupNotFound,
PortableGroup::MemberNotFound));
virtual void analyze_loads (
PortableGroup::ObjectGroup_ptr object_group,
CosLoadBalancing::LoadManager_ptr load_manager
ACE_ENV_ARG_DECL_WITH_DEFAULTS)
ACE_THROW_SPEC ((CORBA::SystemException));
//@}
protected:
/// Retrieve the least loaded location from the given list of
/// locations.
CORBA::Boolean get_location (const PortableGroup::Locations & locations,
PortableGroup::Location & location);
/// Return the effective load.
CORBA::Float effective_load (CORBA::Float previous_load,
CORBA::Float new_load);
private:
/// Container that maps location to load list.
LoadMap load_map_;
/// Lock used to ensure atomic access to state retained by this
/// class.
TAO_SYNCH_MUTEX lock_;
CORBA::Float critical_threshold_;
CORBA::Float reject_threshold_;
CORBA::Float tolerance_;
CORBA::Float dampening_;
CORBA::Float per_balance_load_;
};
#if defined (__ACE_INLINE__)
#include "LB_LeastLoaded.inl"
#endif /* defined INLINE */
#include "ace/post.h"
#endif /* LB_LEAST_LOADED_H */
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