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+/*
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+ *
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+ * Copyright 2015, Google Inc.
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are
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+ * met:
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+ *
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+ * * Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * * Redistributions in binary form must reproduce the above
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+ * copyright notice, this list of conditions and the following disclaimer
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+ * in the documentation and/or other materials provided with the
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+ * distribution.
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+ * * Neither the name of Google Inc. nor the names of its
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+ * contributors may be used to endorse or promote products derived from
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+ * this software without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ *
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+ */
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+
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+#include <stddef.h>
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+
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+#ifndef GRPC_INTERNAL_CORE_CENSUS_AGGREGATION_H
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+#define GRPC_INTERNAL_CORE_CENSUS_AGGREGATION_H
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+
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+/** Structure used to describe an aggregation type. */
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+struct census_aggregation_ops {
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+ /* Create a new aggregation. The pointer returned can be used in future calls
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+ to clone(), free(), record(), data() and reset(). */
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+ void *(*create)(const void *create_arg);
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+ /* Make a copy of an aggregation created by create() */
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+ void *(*clone)(const void *aggregation);
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+ /* Destroy an aggregation created by create() */
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+ void (*free)(void *aggregation);
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+ /* Record a new value against aggregation. */
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+ void (*record)(void *aggregation, double value);
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+ /* Return current aggregation data. The caller must cast this object into
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+ the correct type for the aggregation result. The object returned can be
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+ freed by using free_data(). */
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+ void *(*data)(const void *aggregation);
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+ /* free data returned by data() */
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+ void (*free_data)(void *data);
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+ /* Reset an aggregation to default (zero) values. */
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+ void (*reset)(void *aggregation);
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+ /* Merge 'from' aggregation into 'to'. Both aggregations must be compatible */
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+ void (*merge)(void *to, const void *from);
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+ /* Fill buffer with printable string version of aggregation contents. For
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+ debugging only. Returns the number of bytes added to buffer (a value == n
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+ implies the buffer was of insufficient size). */
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+ size_t (*print)(const void *aggregation, char *buffer, size_t n);
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+};
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+
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+#endif /* GRPC_INTERNAL_CORE_CENSUS_AGGREGATION_H */
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Alistair Veitch