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// -*- C++ -*-
//=============================================================================
/**
* @file LB_RoundRobin.h
*
* $Id$
*
* @author Ossama Othman <ossama@uci.edu>
*/
//=============================================================================
#ifndef LB_ROUND_ROBIN_H
#define LB_ROUND_ROBIN_H
#include /**/ "ace/pre.h"
#include "ace/Null_Mutex.h"
# if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
# endif /* ACE_LACKS_PRAGMA_ONCE */
#include "orbsvcs/LoadBalancing/LB_Location_Index_Map.h"
#include "orbsvcs/CosLoadBalancingS.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class TAO_LB_RoundRobin_Strategy
*
* @brief "Round Robin" load balancing strategy
*
* This load balancing strategy is designed to select an object group
* member residing at the next location.
*/
class TAO_LB_RoundRobin
: public virtual POA_CosLoadBalancing::Strategy
{
public:
/// Constructor.
TAO_LB_RoundRobin (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 (
);
protected:
/// Destructor
~TAO_LB_RoundRobin (void);
private:
/// This servant's default POA.
PortableServer::POA_var poa_;
/// Lock used to ensure atomic access to state retained by this
/// class.
TAO_SYNCH_MUTEX lock_;
/// Table that maps PortableGroup::ObjectGroupId to location
/// sequence index specific to a given object group.
/**
* The location sequence corresponds to the sequence containing the
* locations of the members of a given object group. The value
* stored in this map corresponds to the index of the next element
* in that sequence. For example, if the index stored in the map is
* 2, location[2] will be used when retrieving the object reference
* to be returned from the Strategy::next_member() method.
*/
TAO_LB_Location_Index_Map location_index_map_;
};
TAO_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* LB_ROUND_ROBIN_H */
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