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| 1 | /* cache.h - definitions for the LRU cache | ||
| 2 | * | ||
| 3 | * Copyright (C) 2004-2006 Gerhard H�ring <gh@ghaering.de> | ||
| 4 | * | ||
| 5 | * This file is part of pysqlite. | ||
| 6 | * | ||
| 7 | * This software is provided 'as-is', without any express or implied | ||
| 8 | * warranty. In no event will the authors be held liable for any damages | ||
| 9 | * arising from the use of this software. | ||
| 10 | * | ||
| 11 | * Permission is granted to anyone to use this software for any purpose, | ||
| 12 | * including commercial applications, and to alter it and redistribute it | ||
| 13 | * freely, subject to the following restrictions: | ||
| 14 | * | ||
| 15 | * 1. The origin of this software must not be misrepresented; you must not | ||
| 16 | * claim that you wrote the original software. If you use this software | ||
| 17 | * in a product, an acknowledgment in the product documentation would be | ||
| 18 | * appreciated but is not required. | ||
| 19 | * 2. Altered source versions must be plainly marked as such, and must not be | ||
| 20 | * misrepresented as being the original software. | ||
| 21 | * 3. This notice may not be removed or altered from any source distribution. | ||
| 22 | */ | ||
| 23 | |||
| 24 | #ifndef PYSQLITE_CACHE_H | ||
| 25 | #define PYSQLITE_CACHE_H | ||
| 26 | #include "Python.h" | ||
| 27 | |||
| 28 | /* The LRU cache is implemented as a combination of a doubly-linked with a | ||
| 29 | * dictionary. The list items are of type 'Node' and the dictionary has the | ||
| 30 | * nodes as values. */ | ||
| 31 | |||
| 32 | typedef struct _Node | ||
| 33 | { | ||
| 34 | PyObject_HEAD | ||
| 35 | PyObject* key; | ||
| 36 | PyObject* data; | ||
| 37 | long count; | ||
| 38 | struct _Node* prev; | ||
| 39 | struct _Node* next; | ||
| 40 | } Node; | ||
| 41 | |||
| 42 | typedef struct | ||
| 43 | { | ||
| 44 | PyObject_HEAD | ||
| 45 | int size; | ||
| 46 | |||
| 47 | /* a dictionary mapping keys to Node entries */ | ||
| 48 | PyObject* mapping; | ||
| 49 | |||
| 50 | /* the factory callable */ | ||
| 51 | PyObject* factory; | ||
| 52 | |||
| 53 | Node* first; | ||
| 54 | Node* last; | ||
| 55 | |||
| 56 | /* if set, decrement the factory function when the Cache is deallocated. | ||
| 57 | * this is almost always desirable, but not in the pysqlite context */ | ||
| 58 | int decref_factory; | ||
| 59 | } Cache; | ||
| 60 | |||
| 61 | extern PyTypeObject NodeType; | ||
| 62 | extern PyTypeObject CacheType; | ||
| 63 | |||
| 64 | int node_init(Node* self, PyObject* args, PyObject* kwargs); | ||
| 65 | void node_dealloc(Node* self); | ||
| 66 | |||
| 67 | int cache_init(Cache* self, PyObject* args, PyObject* kwargs); | ||
| 68 | void cache_dealloc(Cache* self); | ||
| 69 | PyObject* cache_get(Cache* self, PyObject* args); | ||
| 70 | |||
| 71 | int cache_setup_types(void); | ||
| 72 | |||
| 73 | #endif | ||