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// -*- C++ -*-
//=============================================================================
/**
* @file LB_LoadAverage.h
*
* $Id$
*
* @author Jaiganesh Balasubramanian <jai@dre.vanderbilt.edu>
* @author Ossama Othman <ossama@dre.vanderbilt.edu>
*/
//=============================================================================
#ifndef LB_LOAD_AVERAGE_H
#define LB_LOAD_AVERAGE_H
#include /**/ "ace/pre.h"
#include "orbsvcs/LoadBalancing/LB_LoadMap.h"
# if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
# endif /* ACE_LACKS_PRAGMA_ONCE */
#include "orbsvcs/CosLoadBalancingS.h"
#include "ace/Synch_Traits.h"
#include "ace/Thread_Mutex.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
namespace TAO_LB
{
/**
* @name Default LoadAverage strategy parameters.
*
* Defaults defined by the Load Balancing specification.
*/
//@{
const CORBA::Float LA_DEFAULT_TOLERANCE = 1;
const CORBA::Float LA_DEFAULT_DAMPENING = 0;
const CORBA::Float LA_DEFAULT_PER_BALANCE_LOAD = 0;
const CORBA::Float LA_DEFAULT_DIFF_AVERAGE_CUTOFF = 0.8f;
//@}
}
/**
* @class TAO_LB_LoadAverage
*
* @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_LB_LoadAverage
: public virtual POA_CosLoadBalancing::Strategy
{
public:
/// Constructor.
TAO_LB_LoadAverage (PortableServer::POA_ptr poa);
/**
* @name CosLoadBalancing::Strategy methods
*
* Methods required by the CosLoadBalancing::Strategy interface.
*/
//@{
virtual char * name (void);
virtual CosLoadBalancing::Properties * get_properties ();
virtual void push_loads (
const PortableGroup::Location & the_location,
const CosLoadBalancing::LoadList & loads);
virtual CosLoadBalancing::LoadList * get_loads (
CosLoadBalancing::LoadManager_ptr load_manager,
const PortableGroup::Location & the_location);
virtual CORBA::Object_ptr next_member (
PortableGroup::ObjectGroup_ptr object_group,
CosLoadBalancing::LoadManager_ptr load_manager);
virtual void analyze_loads (
PortableGroup::ObjectGroup_ptr object_group,
CosLoadBalancing::LoadManager_ptr load_manager);
//@}
/// Returns the default POA for this servant.
virtual PortableServer::POA_ptr _default_POA (
);
/// Initialize the LoadAverage instance with the given properties.
void init (const PortableGroup::Properties & props);
protected:
/// Destructor.
~TAO_LB_LoadAverage (void);
/// Return the effective load.
CORBA::Float effective_load (CORBA::Float previous_load,
CORBA::Float new_load);
/// Push the new load into this Strategy's load processor, and
/// return the corresponding effective load.
void push_loads (
const PortableGroup::Location & the_location,
const CosLoadBalancing::LoadList & loads,
CosLoadBalancing::Load & effective_load);
/// Utility method to extract a CORBA::Float value from the given
/// property.
void extract_float_property (const PortableGroup::Property & property,
CORBA::Float & value);
private:
/// This servant's default POA.
PortableServer::POA_var poa_;
/// Table that maps location to load list.
TAO_LB_LoadMap * load_map_;
/// Lock used to ensure atomic access to state retained by this
/// class.
TAO_SYNCH_MUTEX * lock_;
/// Cached set of properties used when initializing this strategy.
CosLoadBalancing::Properties properties_;
/**
* @name LoadAverage Property Values
*
* Cached LoadAverage load balancing strategy property values.
*/
//@{
///
CORBA::Float tolerance_;
///
CORBA::Float dampening_;
///
CORBA::Float per_balance_load_;
//@}
CosLoadBalancing::LoadList current_loads_;
};
TAO_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "orbsvcs/LoadBalancing/LB_LoadAverage.inl"
#endif /* defined INLINE */
#include /**/ "ace/post.h"
#endif /* LB_LOAD_AVERAGE_H */
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