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114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkGeoTreeNodeCache.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/*-------------------------------------------------------------------------
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Copyright 2008 Sandia Corporation.
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Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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the U.S. Government retains certain rights in this software.
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-------------------------------------------------------------------------*/
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/**
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* @class vtkGeoTreeNodeCache
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* @brief Manages a list of vtkGeoTreeNodes.
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*
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*
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* vtkGeoTreeNodeCache keeps track of a linked list of vtkGeoTreeNodes,
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* and has operations to move nodes to the front of the list and to
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* delete data from the least used nodes. This is used to recover memory
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* from nodes that store data that hasn't been used in a while.
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*/
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#ifndef vtkGeoTreeNodeCache_h
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#define vtkGeoTreeNodeCache_h
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#include "vtkGeovisCoreModule.h" // For export macro
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#include "vtkObject.h"
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#include "vtkSmartPointer.h" // For SP ivars
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class vtkGeoTreeNode;
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class VTKGEOVISCORE_EXPORT vtkGeoTreeNodeCache : public vtkObject
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{
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public:
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static vtkGeoTreeNodeCache *New();
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vtkTypeMacro(vtkGeoTreeNodeCache,vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
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//@{
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/**
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* The size of the cache of geospatial nodes.
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* When the size reaches this limit, the list of non-empty
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* nodes will be shortened to CacheMinimumLimit.
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*/
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vtkSetMacro(CacheMaximumLimit, int);
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vtkGetMacro(CacheMaximumLimit, int);
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//@}
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//@{
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/**
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* The cache is reduced to this size when the maximum limit is reached.
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*/
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vtkSetMacro(CacheMinimumLimit, int);
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vtkGetMacro(CacheMinimumLimit, int);
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//@}
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/**
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* Send a node to the front of the list.
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* Perform this whenever a node is accessed, so that the most
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* recently accessed nodes' data are not deleted.
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*/
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void SendToFront(vtkGeoTreeNode* node);
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/**
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* Remove the node from the list.
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*/
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void RemoveNode(vtkGeoTreeNode* node);
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//@{
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/**
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* The current size of the list.
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*/
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vtkGetMacro(Size, int);
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//@}
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protected:
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vtkGeoTreeNodeCache();
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~vtkGeoTreeNodeCache();
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/**
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* Removes data from the oldest nodes and removes them from
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* the list until the list is of size CacheSize.
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*/
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void TrimToCacheMinimum();
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/**
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* Checks whether a node is the last of a set of siblings
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* to be removed from the list. If so, deletes data from the
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* node and all siblings.
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*/
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void DeleteDataFromSiblings(vtkGeoTreeNode* node);
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int Size;
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int CacheMinimumLimit;
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int CacheMaximumLimit;
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vtkSmartPointer<vtkGeoTreeNode> Newest;
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vtkSmartPointer<vtkGeoTreeNode> Oldest;
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private:
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vtkGeoTreeNodeCache(const vtkGeoTreeNodeCache&) VTK_DELETE_FUNCTION;
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void operator=(const vtkGeoTreeNodeCache&) VTK_DELETE_FUNCTION;
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};
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#endif
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