1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #define GOT_PACKIDX_CACHE_SIZE	64
18 #define GOT_PACK_CACHE_SIZE	GOT_PACKIDX_CACHE_SIZE
19 
20 #define GOT_OBJECT_CACHE_SIZE	8192
21 
22 enum got_object_chache_type {
23 	GOT_OBJECT_CACHE_TYPE_OBJ,
24 	GOT_OBJECT_CACHE_TYPE_TREE
25 };
26 
27 struct got_object_cache_entry {
28 	struct got_object_id id;
29 	union {
30 		struct got_object *obj;
31 		struct got_tree_object *tree;
32 	} data;
33 };
34 
35 struct got_object_cache {
36 	enum got_object_chache_type type;
37 	struct got_object_idset *set;
38 	int cache_hit;
39 	int cache_miss;
40 };
41 
42 struct got_repository {
43 	char *path;
44 	char *path_git_dir;
45 
46 	/* The pack index cache speeds up search for packed objects. */
47 	struct got_packidx *packidx_cache[GOT_PACKIDX_CACHE_SIZE];
48 
49 	/* Open file handles for pack files. */
50 	struct got_pack packs[GOT_PACK_CACHE_SIZE];
51 
52 	/* Caches for opened objects. */
53 	struct got_object_cache objcache;
54 	struct got_object_cache treecache;
55 };
56 
57 const struct got_error*got_repo_cache_object(struct got_repository *,
58     struct got_object_id *, struct got_object *);
59 struct got_object *got_repo_get_cached_object(struct got_repository *,
60     struct got_object_id *);
61 const struct got_error*got_repo_cache_tree(struct got_repository *,
62     struct got_object_id *, struct got_tree_object *);
63 struct got_tree_object *got_repo_get_cached_tree(struct got_repository *,
64     struct got_object_id *);