123 lines
4.1 KiB
C++
123 lines
4.1 KiB
C++
// Filename: geomCacheManager.cxx
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// Created by: drose (11Mar05)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#include "geomCacheManager.h"
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#include "geomCacheEntry.h"
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#include "mutexHolder.h"
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GeomCacheManager *GeomCacheManager::_global_ptr = NULL;
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PStatCollector GeomCacheManager::_geom_cache_size_pcollector("Geom cache size");
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PStatCollector GeomCacheManager::_geom_cache_active_pcollector("Geom cache size:Active");
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PStatCollector GeomCacheManager::_geom_cache_record_pcollector("Geom cache operations:record");
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PStatCollector GeomCacheManager::_geom_cache_erase_pcollector("Geom cache operations:erase");
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PStatCollector GeomCacheManager::_geom_cache_evict_pcollector("Geom cache operations:evict");
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////////////////////////////////////////////////////////////////////
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// Function: GeomCacheManager::Constructor
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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GeomCacheManager::
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GeomCacheManager() :
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_lock("GeomCacheManager"),
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_total_size(0)
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{
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// We deliberately hang on to this pointer forever.
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_list = new GeomCacheEntry;
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_list->ref();
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_list->_next = _list;
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_list->_prev = _list;
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}
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////////////////////////////////////////////////////////////////////
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// Function: GeomCacheManager::Destructor
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// Access: Protected
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// Description:
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////////////////////////////////////////////////////////////////////
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GeomCacheManager::
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~GeomCacheManager() {
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// Shouldn't be deleting this global object.
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nassertv(false);
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}
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////////////////////////////////////////////////////////////////////
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// Function: GeomCacheManager::get_global_ptr
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// Access: Published, Static
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// Description: Returns the global cache manager pointer.
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////////////////////////////////////////////////////////////////////
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GeomCacheManager *GeomCacheManager::
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get_global_ptr() {
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if (_global_ptr == (GeomCacheManager *)NULL) {
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_global_ptr = new GeomCacheManager;
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}
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return _global_ptr;
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}
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////////////////////////////////////////////////////////////////////
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// Function: GeomCacheManager::evict_old_entries
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// Access: Private
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// Description: Trims the cache size down to get_max_size() by
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// evicting old cache entries as needed. It is assumed
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// that you already hold the lock before calling this
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// method.
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////////////////////////////////////////////////////////////////////
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void GeomCacheManager::
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evict_old_entries() {
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int current_frame = ClockObject::get_global_clock()->get_frame_count();
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int min_frames = geom_cache_min_frames;
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int max_size = get_max_size();
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while (_total_size > max_size) {
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PT(GeomCacheEntry) entry = _list->_next;
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nassertv(entry != _list);
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if (current_frame - entry->_last_frame_used < min_frames) {
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// Never mind, this one is too new.
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if (gobj_cat.is_debug()) {
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gobj_cat.debug()
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<< "Oldest element in cache is "
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<< current_frame - entry->_last_frame_used
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<< " frames; keeping cache at " << _total_size << " entries.\n";
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}
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break;
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}
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entry->unref();
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if (gobj_cat.is_debug()) {
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gobj_cat.debug()
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<< "cache total_size = " << _total_size << " entries, max_size = "
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<< max_size << ", removing " << *entry << "\n";
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}
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entry->evict_callback();
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if (PStatClient::is_connected()) {
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if (entry->_last_frame_used == current_frame) {
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GeomCacheManager::_geom_cache_active_pcollector.sub_level(1);
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}
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}
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--_total_size;
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entry->remove_from_list();
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_geom_cache_evict_pcollector.add_level(1);
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}
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_geom_cache_size_pcollector.set_level(_total_size);
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}
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