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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_RAPPOR_SAMPLER_H_
#define COMPONENTS_RAPPOR_SAMPLER_H_
#include <map>
#include <memory>
#include <string>
#include <unordered_map>
#include "base/macros.h"
#include "components/rappor/public/rappor_parameters.h"
#include "components/rappor/public/sample.h"
namespace rappor {
class RapporReports;
namespace internal {
// Sampler manages the collection and storage of Sample objects.
// For each metric name, it will randomly select one Sample to store and
// use when generating RapporReports.
class Sampler {
public:
Sampler();
~Sampler();
// Store this sample for metric name, randomly selecting a sample if
// others have already been recorded.
void AddSample(const std::string& metric_name,
std::unique_ptr<Sample> sample);
// Generate randomized reports for all stored samples and store them
// in |reports|, then discard the samples.
void ExportMetrics(const std::string& secret, RapporReports* reports);
private:
// The number of samples recorded for each metric since the last export.
std::map<std::string, int> sample_counts_;
// Stores a Sample for each metric, by metric name.
std::unordered_map<std::string, std::unique_ptr<Sample>> samples_;
DISALLOW_COPY_AND_ASSIGN(Sampler);
};
} // namespace internal
} // namespace rappor
#endif // COMPONENTS_RAPPOR_SAMPLER_H_
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