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-rw-r--r--source3/include/memcache.h55
1 files changed, 54 insertions, 1 deletions
diff --git a/source3/include/memcache.h b/source3/include/memcache.h
index 5a0ce63cb7..0a596b91a5 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