// Check if the specified "bucket" exists in the cache
bool exists( const SGBucket& b ) const;
+#if 0
// Ensure at least one entry is free in the cache
- void make_space();
+ bool make_space();
+#endif
+
+ // Return the index of the oldest tile in the cache, return -1 if
+ // nothing available to be removed.
+ long get_oldest_tile();
+
+ // Clear a cache entry, note that the cache only holds pointers
+ // and this does not free the object which is pointed to.
+ void clear_entry( long cache_entry );
// Clear all completely loaded tiles (ignores partially loaded tiles)
void clear_cache();
inline FGTileEntry *get_tile( const long tile_index ) {
tile_map_iterator it = tile_cache.find( tile_index );
if ( it != tile_cache.end() ) {
+ it->second->set_timestamp(globals->get_sim_time_sec());
return it->second;
} else {
return NULL;
/**
* Create a new tile and enqueue it for loading.
* @param b
+ * @return success/failure
*/
- void insert_tile( FGTileEntry* e );
+ bool insert_tile( FGTileEntry* e );
};