1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
#ifndef STATS_PREFIX_H
#define STATS_PREFIX_H
/* The stats prefix subsystem stores detailed statistics for each key prefix.
* Simple statistics like total number of GETS are stored by the Stats
* subsystem defined elsewhere.
*
* Suppose the prefix delimiter is ":", then "user:123" and "user:456" both
* have the same prefix "user".
*/
/* Initialize the stats prefix subsystem. Should be called once before other
* functions are called. The global hash initialization should be done before
* using this subsystem.
*/
void stats_prefix_init(char prefix_delimiter);
/* Clear previously collected stats. Requires you to have the acquired
* the STATS_LOCK() first.
*/
void stats_prefix_clear(void);
/* Record a GET for a key */
void stats_prefix_record_get(const char *key, const size_t nkey, const bool is_hit);
/* Record a DELETE for a key */
void stats_prefix_record_delete(const char *key, const size_t nkey);
/* Record a SET for a key */
void stats_prefix_record_set(const char *key, const size_t nkey);
/* Return the collected stats in a textual for suitable for writing to a client.
* The size of the output text is stored in the length parameter.
* Returns NULL on error
*/
char *stats_prefix_dump(int *length);
/* Visible for testing */
#define PREFIX_HASH_SIZE 256
typedef struct _prefix_stats PREFIX_STATS;
struct _prefix_stats {
char *prefix;
size_t prefix_len;
uint64_t num_gets;
uint64_t num_sets;
uint64_t num_deletes;
uint64_t num_hits;
PREFIX_STATS *next;
};
/* Return the PREFIX_STATS structure for the specified key, creating it if
* it does not already exist. Returns NULL if the key does not contain
* prefix delimiter, or if there was an error. Requires you to have acquired
* STATS_LOCK() first.
*/
PREFIX_STATS *stats_prefix_find(const char *key, const size_t nkey);
#endif
|
