91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
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// Copyright 2015 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_DRIVE_METRICS_PROVIDER_H_
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#define COMPONENTS_METRICS_DRIVE_METRICS_PROVIDER_H_
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#include "base/functional/callback_forward.h"
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#include "base/gtest_prod_util.h"
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#include "base/memory/weak_ptr.h"
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#include "base/sequence_checker.h"
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#include "components/metrics/metrics_provider.h"
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#include "third_party/metrics_proto/system_profile.pb.h"
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namespace base {
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class FilePath;
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}
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namespace metrics {
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// Provides metrics about the local drives on a user's computer. Currently only
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// checks to see if they incur a seek-time penalty (e.g. if they're SSDs).
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class DriveMetricsProvider : public metrics::MetricsProvider {
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public:
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explicit DriveMetricsProvider(int local_state_path_key);
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DriveMetricsProvider(const DriveMetricsProvider&) = delete;
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DriveMetricsProvider& operator=(const DriveMetricsProvider&) = delete;
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~DriveMetricsProvider() override;
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// metrics::MetricsProvider:
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void AsyncInit(base::OnceClosure done_callback) override;
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void ProvideSystemProfileMetrics(
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metrics::SystemProfileProto* system_profile_proto) override;
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private:
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FRIEND_TEST_ALL_PREFIXES(DriveMetricsProviderTest, HasSeekPenalty);
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// A response to querying a drive as to whether it incurs a seek penalty.
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// |has_seek_penalty| is set if |success| is true.
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struct SeekPenaltyResponse {
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SeekPenaltyResponse();
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bool success;
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bool has_seek_penalty;
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};
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struct DriveMetrics {
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SeekPenaltyResponse app_drive;
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SeekPenaltyResponse user_data_drive;
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};
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// Determine whether the device that services |path| has a seek penalty.
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// Returns false if it couldn't be determined (e.g., |path| doesn't exist).
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static bool HasSeekPenalty(const base::FilePath& path,
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bool* has_seek_penalty);
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// Gather metrics about various drives. Should be run on a background thread.
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static DriveMetrics GetDriveMetricsOnBackgroundThread(
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int local_state_path_key);
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// Tries to determine whether there is a penalty for seeking on the drive that
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// hosts |path_service_key| (for example: the drive that holds "Local State").
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static void QuerySeekPenalty(int path_service_key,
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SeekPenaltyResponse* response);
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// Called when metrics are done being gathered asynchronously.
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// |done_callback| is the callback that should be called once all metrics are
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// gathered.
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void GotDriveMetrics(base::OnceClosure done_callback,
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const DriveMetrics& metrics);
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// Fills |drive| with information from successful |response|s.
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void FillDriveMetrics(const SeekPenaltyResponse& response,
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metrics::SystemProfileProto::Hardware::Drive* drive);
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// The key to give to base::PathService to obtain the path to local state
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// (supplied by the embedder).
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int local_state_path_key_;
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// Information gathered about various important drives.
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DriveMetrics metrics_;
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SEQUENCE_CHECKER(sequence_checker_);
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base::WeakPtrFactory<DriveMetricsProvider> weak_ptr_factory_{this};
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};
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} // namespace metrics
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#endif // COMPONENTS_METRICS_DRIVE_METRICS_PROVIDER_H_
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