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linux_cpu_measurement_node.hpp
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linux_cpu_measurement_node.hpp
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// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// 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 SYSTEM_METRICS_COLLECTOR__LINUX_CPU_MEASUREMENT_NODE_HPP_
#define SYSTEM_METRICS_COLLECTOR__LINUX_CPU_MEASUREMENT_NODE_HPP_
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include "../../src/system_metrics_collector/periodic_measurement_node.hpp"
#include "../../src/system_metrics_collector/proc_cpu_data.hpp"
/**
* Parse a line read from /proc/stat
*
* @param stat_cpu_line a line from /proc/stat
* @return ProcCpuData struct populated if parsed, otherwise empty
*/
ProcCpuData processLine(const std::string & stat_cpu_line);
/**
* Compute the percentage of CPU active.
*
* @param measurement1 the first measurement
* @param measurement2 the second measurement (made after the first)
* @return percentage of CPU active
*/
double computeCpuActivePercentage(
const ProcCpuData & measurement1,
const ProcCpuData & measurement2);
/**
* Node that periodically calculates the % of active CPU by
* reading /proc/stat.
*/
class LinuxCpuMeasurementNode : public PeriodicMeasurementNode
{
public:
/**
*
* @param name
* @param measurement_period
* @param topic
*/
LinuxCpuMeasurementNode(
const std::string & name,
const std::chrono::milliseconds measurement_period,
const std::string & topic,
const std::chrono::milliseconds & publish_period =
PeriodicMeasurementNode::DEFAULT_PUBLISH_WINDOW);
virtual ~LinuxCpuMeasurementNode() = default;
protected:
/**
* Perform a periodic measurement calculating the percentage of CPU active.
*
* @return percentage of CPU active
*/
double periodicMeasurement() override;
private:
/**
* Perform a single measurement of cpu data by reading /proc/stat.
*
* @return ProcCpuData the measurement made
*/
virtual ProcCpuData makeSingleMeasurement();
ProcCpuData last_measurement_;
};
#endif // SYSTEM_METRICS_COLLECTOR__LINUX_CPU_MEASUREMENT_NODE_HPP_