| // 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 <string> |
| |
| #include "base/containers/scoped_ptr_hash_map.h" |
| #include "base/macros.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "components/rappor/rappor_parameters.h" |
| #include "components/rappor/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, scoped_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. |
| base::ScopedPtrHashMap<std::string, scoped_ptr<Sample>> samples_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Sampler); |
| }; |
| |
| } // namespace internal |
| |
| } // namespace rappor |
| |
| #endif // COMPONENTS_RAPPOR_SAMPLER_H_ |