123 lines
3.3 KiB
C++
123 lines
3.3 KiB
C++
/**
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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.cxx
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* @author drose
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* @date 2005-03-11
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*/
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#include "geomCacheManager.h"
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#include "geomCacheEntry.h"
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#include "geomMunger.h"
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#include "lightMutexHolder.h"
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#include "lightReMutexHolder.h"
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#include "clockObject.h"
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GeomCacheManager *GeomCacheManager::_global_ptr = nullptr;
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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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*
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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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*
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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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nassert_raise("attempt to delete GeomCacheManager");
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}
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/**
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* Immediately empties all elements in the cache.
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*/
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void GeomCacheManager::
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flush() {
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// Prevent deadlock
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LightReMutexHolder registry_holder(GeomMunger::get_registry()->_registry_lock);
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LightMutexHolder holder(_lock);
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evict_old_entries(0, false);
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}
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/**
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* 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 == nullptr) {
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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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* Trims the cache size down to the specified size by evicting old cache
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* entries as needed. It is assumed that you already hold the lock before
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* calling this method.
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*/
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void GeomCacheManager::
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evict_old_entries(int max_size, bool keep_current) {
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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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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 (keep_current && 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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