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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_METRICS_DRIVE_METRICS_PROVIDER_H_
- #define COMPONENTS_METRICS_DRIVE_METRICS_PROVIDER_H_
- #include "base/callback_forward.h"
- #include "base/gtest_prod_util.h"
- #include "base/memory/ref_counted.h"
- #include "base/memory/weak_ptr.h"
- #include "base/sequence_checker.h"
- #include "components/metrics/metrics_provider.h"
- #include "third_party/metrics_proto/system_profile.pb.h"
- namespace base {
- class FilePath;
- }
- namespace metrics {
- // Provides metrics about the local drives on a user's computer. Currently only
- // checks to see if they incur a seek-time penalty (e.g. if they're SSDs).
- class DriveMetricsProvider : public metrics::MetricsProvider {
- public:
- explicit DriveMetricsProvider(int local_state_path_key);
- DriveMetricsProvider(const DriveMetricsProvider&) = delete;
- DriveMetricsProvider& operator=(const DriveMetricsProvider&) = delete;
- ~DriveMetricsProvider() override;
- // metrics::MetricsProvider:
- void AsyncInit(base::OnceClosure done_callback) override;
- void ProvideSystemProfileMetrics(
- metrics::SystemProfileProto* system_profile_proto) override;
- private:
- FRIEND_TEST_ALL_PREFIXES(DriveMetricsProviderTest, HasSeekPenalty);
- // A response to querying a drive as to whether it incurs a seek penalty.
- // |has_seek_penalty| is set if |success| is true.
- struct SeekPenaltyResponse {
- SeekPenaltyResponse();
- bool success;
- bool has_seek_penalty;
- };
- struct DriveMetrics {
- SeekPenaltyResponse app_drive;
- SeekPenaltyResponse user_data_drive;
- };
- // Determine whether the device that services |path| has a seek penalty.
- // Returns false if it couldn't be determined (e.g., |path| doesn't exist).
- static bool HasSeekPenalty(const base::FilePath& path,
- bool* has_seek_penalty);
- // Gather metrics about various drives. Should be run on a background thread.
- static DriveMetrics GetDriveMetricsOnBackgroundThread(
- int local_state_path_key);
- // Tries to determine whether there is a penalty for seeking on the drive that
- // hosts |path_service_key| (for example: the drive that holds "Local State").
- static void QuerySeekPenalty(int path_service_key,
- SeekPenaltyResponse* response);
- // Called when metrics are done being gathered asynchronously.
- // |done_callback| is the callback that should be called once all metrics are
- // gathered.
- void GotDriveMetrics(base::OnceClosure done_callback,
- const DriveMetrics& metrics);
- // Fills |drive| with information from successful |response|s.
- void FillDriveMetrics(const SeekPenaltyResponse& response,
- metrics::SystemProfileProto::Hardware::Drive* drive);
- // The key to give to base::PathService to obtain the path to local state
- // (supplied by the embedder).
- int local_state_path_key_;
- // Information gathered about various important drives.
- DriveMetrics metrics_;
- SEQUENCE_CHECKER(sequence_checker_);
- base::WeakPtrFactory<DriveMetricsProvider> weak_ptr_factory_{this};
- };
- } // namespace metrics
- #endif // COMPONENTS_METRICS_DRIVE_METRICS_PROVIDER_H_
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