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/* meter.h: METER INTERFACE
*
* $Id$
* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
*
* .sources: mps.design.metrics.
*
* .purpose: Defines an interface for creating "meters" that accumulate
* the number, total and mean^2 of a set of data points. These
* accumulators can be used to report on the number, total, average, and
* variance of the data set.
*/
#ifndef meter_h
#define meter_h
#include "mpmtypes.h"
#include "config.h"
#include "misc.h"
#include "mpslib.h"
typedef struct MeterStruct *Meter;
typedef struct MeterStruct
{
const char *name;
Count count;
double total;
double meanSquared;
Size min;
Size max;
} MeterStruct;
extern void MeterInit(Meter meter, const char *name, void *owner);
extern void MeterAccumulate(Meter meter, Size amount);
extern Res MeterWrite(Meter meter, mps_lib_FILE *stream, Count depth);
extern void MeterEmit(Meter meter);
#define METER_DECL(meter) STATISTIC_DECL(struct MeterStruct meter)
#define METER_INIT(meter, init, owner) \
BEGIN STATISTIC(MeterInit(&(meter), init, owner)); UNUSED(owner); END
/* Hack: owner is typically only used for MeterInit */
#define METER_ACC(meter, delta) \
STATISTIC(MeterAccumulate(&(meter), delta))
#if defined(STATISTICS)
#define METER_WRITE(meter, stream, depth) BEGIN \
Res _res = MeterWrite(&(meter), (stream), (depth)); \
if (_res != ResOK) return _res; \
END
#elif defined(STATISTICS_NONE)
#define METER_WRITE(meter, stream, depth) NOOP
#else
#error "No statistics configured."
#endif
#define METER_EMIT(meter) STATISTIC(MeterEmit(meter))
#endif /* meter_h */
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
*
* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE 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.
*/
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