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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef METRICSD_COLLECTORS_AVERAGED_STATISTICS_COLLECTOR_H_
#define METRICSD_COLLECTORS_AVERAGED_STATISTICS_COLLECTOR_H_
#include "metrics/metrics_library.h"
class AveragedStatisticsCollector {
public:
AveragedStatisticsCollector(MetricsLibraryInterface* metrics_library,
const std::string& diskstats_path,
const std::string& vmstat_path);
// Schedule a wait period.
void ScheduleWait();
// Schedule a collection period.
void ScheduleCollect();
// Callback used by the main loop.
void CollectCallback();
// Callback used by the main loop.
void WaitCallback();
// Read and store the initial values at the beginning of a collection cycle.
void ReadInitialValues();
// Collect the disk usage statistics and report them.
void Collect();
private:
friend class AveragedStatisticsTest;
FRIEND_TEST(AveragedStatisticsTest, ParseDiskStats);
FRIEND_TEST(AveragedStatisticsTest, ParseVmStats);
// Record for retrieving and reporting values from /proc/vmstat
struct VmstatRecord {
uint64_t page_faults; // major faults
uint64_t swap_in; // pages swapped in
uint64_t swap_out; // pages swapped out
};
// Read the disk read/write statistics for the main disk.
bool DiskStatsReadStats(uint64_t* read_sectors, uint64_t* write_sectors);
// Parse the content of the vmstats file into |record|.
bool VmStatsParseStats(const char* stats, struct VmstatRecord* record);
// Read the vmstats into |stats|.
bool VmStatsReadStats(struct VmstatRecord* stats);
MetricsLibraryInterface* metrics_lib_;
base::FilePath diskstats_path_;
base::FilePath vmstats_path_;
// Values observed at the beginning of the collection period.
uint64_t read_sectors_;
uint64_t write_sectors_;
struct VmstatRecord vmstats_;
double stats_start_time_;
};
#endif // METRICSD_COLLECTORS_AVERAGED_STATISTICS_COLLECTOR_H_
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