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/*
*
* Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* 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
* OWNER 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>
#ifndef GRPC_CORE_LIB_CENSUS_AGGREGATION_H
#define GRPC_CORE_LIB_CENSUS_AGGREGATION_H
/** Structure used to describe an aggregation type. */
struct census_aggregation_ops {
/* Create a new aggregation. The pointer returned can be used in future calls
to clone(), free(), record(), data() and reset(). */
void *(*create)(const void *create_arg);
/* Make a copy of an aggregation created by create() */
void *(*clone)(const void *aggregation);
/* Destroy an aggregation created by create() */
void (*free)(void *aggregation);
/* Record a new value against aggregation. */
void (*record)(void *aggregation, double value);
/* Return current aggregation data. The caller must cast this object into
the correct type for the aggregation result. The object returned can be
freed by using free_data(). */
void *(*data)(const void *aggregation);
/* free data returned by data() */
void (*free_data)(void *data);
/* Reset an aggregation to default (zero) values. */
void (*reset)(void *aggregation);
/* Merge 'from' aggregation into 'to'. Both aggregations must be compatible */
void (*merge)(void *to, const void *from);
/* Fill buffer with printable string version of aggregation contents. For
debugging only. Returns the number of bytes added to buffer (a value == n
implies the buffer was of insufficient size). */
size_t (*print)(const void *aggregation, char *buffer, size_t n);
};
#endif /* GRPC_CORE_LIB_CENSUS_AGGREGATION_H */
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