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 	GOT_OBJECT_CACHE_TYPE_COMMIT,
26 };
27 
28 struct got_object_cache_entry {
29 	struct got_object_id id;
30 	union {
31 		struct got_object *obj;
32 		struct got_tree_object *tree;
33 		struct got_commit_object *commit;
34 	} data;
35 };
36 
37 struct got_object_cache {
38 	enum got_object_chache_type type;
39 	struct got_object_idset *set;
40 	int cache_hit;
41 	int cache_miss;
42 };
43 
44 struct got_repository {
45 	char *path;
46 	char *path_git_dir;
47 
48 	/* The pack index cache speeds up search for packed objects. */
49 	struct got_packidx *packidx_cache[GOT_PACKIDX_CACHE_SIZE];
50 
51 	/* Open file handles for pack files. */
52 	struct got_pack packs[GOT_PACK_CACHE_SIZE];
53 
54 	/* Caches for opened objects. */
55 	struct got_object_cache objcache;
56 	struct got_object_cache treecache;
57 	struct got_object_cache commitcache;
58 };
59 
60 const struct got_error*got_repo_cache_object(struct got_repository *,
61     struct got_object_id *, struct got_object *);
62 struct got_object *got_repo_get_cached_object(struct got_repository *,
63     struct got_object_id *);
64 const struct got_error*got_repo_cache_tree(struct got_repository *,
65     struct got_object_id *, struct got_tree_object *);
66 struct got_tree_object *got_repo_get_cached_tree(struct got_repository *,
67     struct got_object_id *);
68 const struct got_error*got_repo_cache_commit(struct got_repository *,
69     struct got_object_id *, struct got_commit_object *);
70 struct got_commit_object *got_repo_get_cached_commit(struct got_repository *,
71     struct got_object_id *);