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Diffstat (limited to 'src/core/lib/census/aggregation.h')
| -rw-r--r-- | src/core/lib/census/aggregation.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/core/lib/census/aggregation.h b/src/core/lib/census/aggregation.h new file mode 100644 index 0000000000..f353368b97 --- /dev/null +++ b/src/core/lib/census/aggregation.h @@ -0,0 +1,66 @@ +/* + * + * 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 */ |