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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <stddef.h>
#ifndef GRPC_CORE_EXT_CENSUS_AGGREGATION_H
#define GRPC_CORE_EXT_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_EXT_CENSUS_AGGREGATION_H */
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