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#ifndef TARANTOOL_RMEAN_H_INCLUDED
#define TARANTOOL_RMEAN_H_INCLUDED
/*
* Copyright 2010-2016, Tarantool AUTHORS, please see AUTHORS file.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stddef.h>
#include <stdint.h>
#include "trivia/util.h"
#include "third_party/tarantool_ev.h"
#if defined(__cplusplus)
extern "C" {
#endif /* defined(__cplusplus) */
/** Rolling mean time window, in seconds. */
enum { RMEAN_WINDOW = 5 };
struct stats {
const char *name;
int64_t value[RMEAN_WINDOW + 1];
int64_t total;
};
/**
* Rolling average.
*/
struct rmean {
ev_timer timer;
unsigned stats_n;
double prev_ts;
struct stats stats[0];
};
static inline int64_t
rmean_total(struct rmean *rmean, size_t name)
{
return rmean->stats[name].total;
}
void
rmean_roll(int64_t *value, double dt);
int64_t
rmean_mean(struct rmean *rmean, size_t name);
struct rmean *
rmean_new(const char **name, size_t n);
void
rmean_delete(struct rmean *rmean);
void
rmean_cleanup(struct rmean *rmean);
void
rmean_collect(struct rmean *rmean, size_t name, int64_t value);
typedef int (*rmean_cb)(const char *name, int rps, int64_t total, void *cb_ctx);
int
rmean_foreach(struct rmean *rmean, rmean_cb cb, void *cb_ctx);
#if defined(__cplusplus)
} /* extern "C" */
#endif /* defined(__cplusplus) */
#endif /* TARANTOOL_RMEAN_H_INCLUDED */
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