| /* |
| * |
| * Copyright 2015, 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_INTERNAL_CORE_CENSUS_AGGREGATION_H |
| #define GRPC_INTERNAL_CORE_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_INTERNAL_CORE_CENSUS_AGGREGATION_H */ |