diff options
| -rw-r--r-- | source3/include/memcache.h | 55 |
1 files changed, 54 insertions, 1 deletions
diff --git a/source3/include/memcache.h b/source3/include/memcache.h index 5a0ce63cb76..0a596b91a52 100644 --- a/source3/include/memcache.h +++ b/source3/include/memcache.h @@ -1,7 +1,7 @@ /* Unix SMB/CIFS implementation. In-memory cache - Copyright (C) Volker Lendecke 2005-2007 + Copyright (C) Volker Lendecke 2007-2008 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -24,6 +24,15 @@ struct memcache; +/* + * A memcache can store different subkeys with overlapping keys, the + * memcache_number becomes part of the key. Feel free to add caches of your + * own here. + * + * If you add talloc type caches, also note this in the switch statement in + * memcache_is_talloc(). + */ + enum memcache_number { STAT_CACHE, UID_SID_CACHE, @@ -38,25 +47,69 @@ enum memcache_number { SINGLETON_CACHE }; +/* + * Create a memcache structure. max_size is in bytes, if you set it 0 it will + * not forget anything. + */ + struct memcache *memcache_init(TALLOC_CTX *mem_ctx, size_t max_size); +/* + * If you set this global memcache, use it as the default cache when NULL is + * passed to the memcache functions below. This is a workaround for many + * situations where passing the cache everywhere would be a big hassle. + */ + void memcache_set_global(struct memcache *cache); +/* + * Add a data blob to the cache + */ + void memcache_add(struct memcache *cache, enum memcache_number n, DATA_BLOB key, DATA_BLOB value); +/* + * Add a talloc object to the cache. The difference to memcache_add() is that + * when the objects is to be discared, talloc_free is called for it. Also + * talloc_move() ownership of the object to the cache. + * + * Please note that the current implementation has a fixed relationship + * between what cache subtypes store talloc objects and which ones store plain + * blobs. We can fix this, but for now we don't have a mixed use of blobs vs + * talloc objects in the cache types. + */ + void memcache_add_talloc(struct memcache *cache, enum memcache_number n, DATA_BLOB key, void *ptr); +/* + * Delete an object from the cache + */ + void memcache_delete(struct memcache *cache, enum memcache_number n, DATA_BLOB key); +/* + * Look up an object from the cache. Memory still belongs to the cache, so + * make a copy of it if needed. + */ + bool memcache_lookup(struct memcache *cache, enum memcache_number n, DATA_BLOB key, DATA_BLOB *value); +/* + * Look up an object from the cache. Memory still belongs to the cache, so + * make a copy of it if needed. + */ + void *memcache_lookup_talloc(struct memcache *cache, enum memcache_number n, DATA_BLOB key); +/* + * Flush a complete cache subset. + */ + void memcache_flush(struct memcache *cache, enum memcache_number n); #endif |