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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/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/sequenced_task_runner.h"
#include "base/threading/thread_checker.h"
#include "components/metrics/metrics_provider.h"
#include "components/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).
//
// Defers gathering metrics until after "rush hour" (startup) so as to not bog
// down the file thread.
class DriveMetricsProvider : public metrics::MetricsProvider {
public:
DriveMetricsProvider(scoped_refptr<base::SequencedTaskRunner> file_thread,
int local_state_path_key);
~DriveMetricsProvider() override;
// metrics::MetricsDataProvider:
void ProvideSystemProfileMetrics(
metrics::SystemProfileProto* system_profile_proto) override;
// Called to start gathering metrics.
void GetDriveMetrics(const base::Closure& done_callback);
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 on |file_thread_|.
static DriveMetrics GetDriveMetricsOnFileThread(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 from the FILE thread.
// |done_callback| is the callback that should be called once all metrics are
// gathered.
void GotDriveMetrics(const base::Closure& done_callback,
const DriveMetrics& metrics);
// Fills |drive| with information from successful |response|s.
void FillDriveMetrics(const SeekPenaltyResponse& response,
metrics::SystemProfileProto::Hardware::Drive* drive);
// The thread on which file operations are performed (supplied by the
// embedder).
scoped_refptr<base::SequencedTaskRunner> file_thread_;
// 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_;
base::ThreadChecker thread_checker_;
base::WeakPtrFactory<DriveMetricsProvider> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(DriveMetricsProvider);
};
} // namespace metrics
#endif // COMPONENTS_METRICS_DRIVE_METRICS_PROVIDER_H_
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