91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file geomCacheManager.h
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* @author drose
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* @date 2005-03-11
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*/
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#ifndef GEOMCACHEMANAGER_H
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#define GEOMCACHEMANAGER_H
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#include "pandabase.h"
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#include "config_gobj.h"
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#include "lightMutex.h"
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#include "pStatCollector.h"
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class GeomCacheEntry;
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/**
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* This is used to keep track of, and limit the size of, the cache of munged
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* vertices, which would otherwise be distributed through all of the
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* GeomVertexData objects in the system.
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*
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* The actual data in the cache is not stored here, but rather it is
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* distributed among the various GeomVertexData source objects. This allows
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* the cache data to propagate through the multiprocess pipeline.
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*
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* This structure actually caches any of a number of different types of
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* pointers, and mixes them all up in the same LRU cache list. Some of them
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* (such as GeomMunger) are reference-counted here in the cache; most are not.
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*/
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class EXPCL_PANDA_GOBJ GeomCacheManager {
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protected:
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GeomCacheManager();
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~GeomCacheManager();
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PUBLISHED:
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INLINE void set_max_size(int max_size) const;
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INLINE int get_max_size() const;
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INLINE int get_total_size() const;
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void flush();
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static GeomCacheManager *get_global_ptr();
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public:
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INLINE void evict_old_entries();
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void evict_old_entries(int max_size, bool keep_current);
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INLINE static void flush_level();
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private:
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// This mutex protects all operations on this object, especially the linked-
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// list operations.
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LightMutex _lock;
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int _total_size;
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// We maintain a doubly-linked list to keep the cache entries in least-
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// recently-used order: the items at the head of the list are ready to be
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// flushed. We use our own doubly-linked list instead of an STL list, just
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// so we can avoid a tiny bit of overhead, especially in keeping the pointer
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// directly into the list from the calling objects.
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// The tail and the head of the list are both kept by the _prev and _next
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// pointers, respectively, within the following object, which always exists
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// solely to keep a handle to the list. Keeping a token of the list this
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// way avoids special cases for an empty list.
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GeomCacheEntry *_list;
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static GeomCacheManager *_global_ptr;
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public:
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static PStatCollector _geom_cache_size_pcollector;
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static PStatCollector _geom_cache_active_pcollector;
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static PStatCollector _geom_cache_record_pcollector;
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static PStatCollector _geom_cache_erase_pcollector;
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static PStatCollector _geom_cache_evict_pcollector;
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friend class GeomCacheEntry;
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};
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#include "geomCacheManager.I"
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#endif
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