61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
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// Copyright 2014 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef COMPONENTS_METRICS_LIBRARY_SUPPORT_HISTOGRAM_MANAGER_H_
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#define COMPONENTS_METRICS_LIBRARY_SUPPORT_HISTOGRAM_MANAGER_H_
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#include <stdint.h>
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#include <memory>
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#include <vector>
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#include "base/lazy_instance.h"
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#include "base/metrics/histogram_flattener.h"
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#include "base/metrics/histogram_snapshot_manager.h"
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#include "base/synchronization/lock.h"
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#include "third_party/metrics_proto/chrome_user_metrics_extension.pb.h"
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namespace metrics {
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// A HistogramManager instance is created by the app. It is the central
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// controller for the acquisition of log data, and recording deltas for
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// transmission to an external server. Public APIs are all thread-safe.
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class HistogramManager : public base::HistogramFlattener {
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public:
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HistogramManager();
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HistogramManager(const HistogramManager&) = delete;
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HistogramManager& operator=(const HistogramManager&) = delete;
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~HistogramManager() override;
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// Snapshot all histograms to record the delta into |uma_proto_| and then
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// returns the serialized protobuf representation of the record in |data|.
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// Returns true if it was successfully serialized.
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bool GetDeltas(std::vector<uint8_t>* data);
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// TODO(mef): Hang Histogram Manager off java object instead of singleton.
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static HistogramManager* GetInstance();
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private:
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friend struct base::LazyInstanceTraitsBase<HistogramManager>;
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// base::HistogramFlattener:
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void RecordDelta(const base::HistogramBase& histogram,
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const base::HistogramSamples& snapshot) override;
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base::HistogramSnapshotManager histogram_snapshot_manager_;
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// Stores the protocol buffer representation for this log.
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metrics::ChromeUserMetricsExtension uma_proto_;
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// Should be acquired whenever GetDeltas() is executing to maintain
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// thread-safety.
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base::Lock get_deltas_lock_;
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};
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} // namespace metrics
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#endif // COMPONENTS_METRICS_LIBRARY_SUPPORT_HISTOGRAM_MANAGER_H_
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