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74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
/* cache.h - definitions for the LRU cache
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*
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* Copyright (C) 2004-2007 Gerhard Häring <gh@ghaering.de>
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*
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* This file is part of pysqlite.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef PYSQLITE_CACHE_H
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#define PYSQLITE_CACHE_H
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#include "Python.h"
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/* The LRU cache is implemented as a combination of a doubly-linked with a
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* dictionary. The list items are of type 'Node' and the dictionary has the
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* nodes as values. */
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typedef struct _pysqlite_Node
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{
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PyObject_HEAD
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PyObject* key;
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PyObject* data;
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long count;
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struct _pysqlite_Node* prev;
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struct _pysqlite_Node* next;
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} pysqlite_Node;
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typedef struct
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{
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PyObject_HEAD
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int size;
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/* a dictionary mapping keys to Node entries */
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PyObject* mapping;
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/* the factory callable */
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PyObject* factory;
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pysqlite_Node* first;
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pysqlite_Node* last;
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/* if set, decrement the factory function when the Cache is deallocated.
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* this is almost always desirable, but not in the pysqlite context */
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int decref_factory;
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} pysqlite_Cache;
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extern PyTypeObject pysqlite_NodeType;
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extern PyTypeObject pysqlite_CacheType;
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int pysqlite_node_init(pysqlite_Node* self, PyObject* args, PyObject* kwargs);
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void pysqlite_node_dealloc(pysqlite_Node* self);
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int pysqlite_cache_init(pysqlite_Cache* self, PyObject* args, PyObject* kwargs);
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void pysqlite_cache_dealloc(pysqlite_Cache* self);
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PyObject* pysqlite_cache_get(pysqlite_Cache* self, PyObject* args);
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int pysqlite_cache_setup_types(void);
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#endif
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