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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 (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 CosLoadBalancing::LoadList * get_loads (
+ CosLoadBalancing::LoadManager_ptr load_manager,
+ const PortableGroup::Location & the_location
+ ACE_ENV_ARG_DECL_WITH_DEFAULTS)
+ ACE_THROW_SPEC ((CORBA::SystemException,
+ CosLoadBalancing::LocationNotFound));
+
+ 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));
+ //@}
+
+ /// Returns the default POA for this servant.
+ virtual PortableServer::POA_ptr _default_POA (
+ ACE_ENV_SINGLE_ARG_DECL_WITH_DEFAULTS
+ );
+
+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 */