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// Copyright 2019 The Abseil 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
//
// https://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.
#ifndef ABSL_STRINGS_INTERNAL_CORDZ_STATISTICS_H_
#define ABSL_STRINGS_INTERNAL_CORDZ_STATISTICS_H_
#include <cstdint>
#include "absl/base/config.h"
#include "absl/strings/internal/cordz_update_tracker.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace cord_internal {
// CordzStatistics captures some meta information about a Cord's shape.
struct CordzStatistics {
using MethodIdentifier = CordzUpdateTracker::MethodIdentifier;
// Node counts information
struct NodeCounts {
size_t flat = 0; // #flats
size_t flat_64 = 0; // #flats up to 64 bytes
size_t flat_128 = 0; // #flats up to 128 bytes
size_t flat_256 = 0; // #flats up to 256 bytes
size_t flat_512 = 0; // #flats up to 512 bytes
size_t flat_1k = 0; // #flats up to 1K bytes
size_t external = 0; // #external reps
size_t substring = 0; // #substring reps
size_t concat = 0; // #concat reps
size_t ring = 0; // #ring buffer reps
size_t btree = 0; // #btree reps
};
// The size of the cord in bytes. This matches the result of Cord::size().
int64_t size = 0;
// The estimated memory used by the sampled cord. This value matches the
// value as reported by Cord::EstimatedMemoryUsage().
// A value of 0 implies the property has not been recorded.
int64_t estimated_memory_usage = 0;
// The effective memory used by the sampled cord, inversely weighted by the
// effective indegree of each allocated node. This is a representation of the
// fair share of memory usage that should be attributed to the sampled cord.
// This value is more useful for cases where one or more nodes are referenced
// by multiple Cord instances, and for cases where a Cord includes the same
// node multiple times (either directly or indirectly).
// A value of 0 implies the property has not been recorded.
int64_t estimated_fair_share_memory_usage = 0;
// The total number of nodes referenced by this cord.
// For ring buffer Cords, this includes the 'ring buffer' node.
// For btree Cords, this includes all 'CordRepBtree' tree nodes as well as all
// the substring, flat and external nodes referenced by the tree.
// A value of 0 implies the property has not been recorded.
int64_t node_count = 0;
// Detailed node counts per type
NodeCounts node_counts;
// The cord method responsible for sampling the cord.
MethodIdentifier method = MethodIdentifier::kUnknown;
// The cord method responsible for sampling the parent cord if applicable.
MethodIdentifier parent_method = MethodIdentifier::kUnknown;
// Update tracker tracking invocation count per cord method.
CordzUpdateTracker update_tracker;
};
} // namespace cord_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_STRINGS_INTERNAL_CORDZ_STATISTICS_H_
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