#ifndef STATS_H
#define STATS_H
struct stats;
struct stats_item;
struct stats_vfuncs {
const char *short_name;
size_t (*alloc_size)(void);
unsigned int (*field_count)(void);
const char *(*field_name)(unsigned int n);
void (*field_value)(string_t *str, const struct stats *stats,
unsigned int n);
bool (*diff)(const struct stats *stats1, const struct stats *stats2,
struct stats *diff_stats_r, const char **error_r);
void (*add)(struct stats *dest, const struct stats *src);
bool (*have_changed)(const struct stats *prev, const struct stats *cur);
void (*export)(buffer_t *buf, const struct stats *stats);
bool (*import)(const unsigned char *data, size_t size, size_t *pos_r,
struct stats *stats, const char **error_r);
};
struct stats_item *stats_register(const struct stats_vfuncs *vfuncs);
void stats_unregister(struct stats_item **item);
/* Allocate struct stats from a given pool. */
struct stats *stats_alloc(pool_t pool);
/* Returns the number of bytes allocated to stats. */
size_t stats_alloc_size(void);
/* Copy all stats from src to dest. */
void stats_copy(struct stats *dest, const struct stats *src);
/* Returns the number of stats fields. */
unsigned int stats_field_count(void);
/* Returns the name of a stats field (exported to doveadm). */
const char *stats_field_name(unsigned int n);
/* Returns the value of a stats field as a string (exported to doveadm). */
void stats_field_value(string_t *str, const struct stats *stats,
unsigned int n);
/* Return diff_stats_r->field = stats2->field - stats1->field.
diff1 is supposed to have smaller values than diff2. Returns TRUE if this
is so, FALSE if not */
bool stats_diff(const struct stats *stats1, const struct stats *stats2,
struct stats *diff_stats_r, const char **error_r);
/* dest->field += src->field */
void stats_add(struct stats *dest, const struct stats *src);
/* Returns TRUE if any fields have changed in cur since prev in a way that
a plugin should send the updated statistics to the stats process. Not all
fields necessarily require sending an update. */
bool stats_have_changed(const struct stats *prev, const struct stats *cur);
/* Export stats into a buffer in binary format. */
void stats_export(buffer_t *buf, const struct stats *stats);
/* Import stats from a buffer. The buffer doesn't need to contain an update to
all the stats items - old_stats are used for that item in such case.
Currently it's not allowed to have unknown items in the buffer. */
bool stats_import(const unsigned char *data, size_t size,
const struct stats *old_stats, struct stats *stats,
const char **error_r);
/* Return a pointer to stats where the specified item starts. The returned
pointer can be used to fill up the item-specific stats (up to its
alloc_size() number of bytes). */
void *stats_fill_ptr(struct stats *stats, struct stats_item *item);
void stats_reset(struct stats *stats);
#endif