SensorGroupTemplate.h 17.5 KB
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//================================================================================
// Name        : SensorGroupTemplate.h
// Author      : Micha Mueller
// Copyright   : Leibniz Supercomputing Centre
// Description : Interface template for sensor group functionality.
//================================================================================

//================================================================================
// This file is part of DCDB (DataCenter DataBase)
// Copyright (C) 2018-2019 Leibniz Supercomputing Centre
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//================================================================================
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#ifndef SENSORGROUPTEMPLATE_H_
#define SENSORGROUPTEMPLATE_H_

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#include "SensorGroupInterface.h"
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#include "EntityInterface.h"
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#include "timestamp.h"

#include <vector>
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#include <memory>
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//TODO cross reference partial template specialization in doxygen docs
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/**
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 * @brief Interface template for sensor group implementations with entities.
 *
 * @details There is a partial template specialization for E = nullptr_t, i.e.
 *          for groups without entities. Common code has to be duplicated and
 *          maintained twice here and in the template specialization. However,
 *          having two templates for cases with and without entities greatly
 *          reduces code duplication in derived plugin sensor groups.
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 *
 * @ingroup pusherplugins
 */
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template <class S, class E = nullptr_t>
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class SensorGroupTemplate : public SensorGroupInterface {
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	//the template shall only be instantiated for classes which derive from SensorBase and EntityInterface respectively
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	static_assert(std::is_base_of<SensorBase, S>::value, "S must derive from SensorBase!");
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	static_assert(std::is_base_of<EntityInterface, E>::value, "E must derive from EntityInterface!");
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protected:
	using S_Ptr = std::shared_ptr<S>;

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public:
	SensorGroupTemplate(const std::string groupName) :
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		SensorGroupInterface(groupName),
		_entity(nullptr) {}
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	SensorGroupTemplate(const SensorGroupTemplate& other) :
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		SensorGroupInterface(other),
		_entity(other._entity) {

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		for(auto s : other._sensors) {
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			S_Ptr sensor = std::make_shared<S>(*s);
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			_sensors.push_back(sensor);
			_baseSensors.push_back(sensor);
		}
	}

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	virtual ~SensorGroupTemplate() {
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	    if(_keepRunning) {
	        stop();
	    }

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		_sensors.clear();
		_baseSensors.clear();
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	}

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	SensorGroupTemplate& operator=(const SensorGroupTemplate& other) {
		SensorGroupInterface::operator=(other);
		_sensors.clear();
		_baseSensors.clear();

		for(auto s : other._sensors) {
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			S_Ptr sensor = std::make_shared<S>(*s);
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			_sensors.push_back(sensor);
			_baseSensors.push_back(sensor);
		}

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		_entity = other._entity;

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		return *this;
	}

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	void setEntity(E* entity) { _entity = entity; }
	E* const getEntity() const { return _entity; }

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	/**
	 * @brief Initialize the sensor group.
	 *
	 * @details This method must not be overwritten. See execOnInit() if custom
	 *          actions are required during initialization. Initializes
	 *          associated sensors and entity.
	 *
	 * @param io IO service to initialize the timer with.
	 */
    virtual void init(boost::asio::io_service& io) final override {
        if(!_entity) {
            LOG(error) << "No entity set for group " << _groupName << "! Cannot initialize group";
            return;
        }

        SensorGroupInterface::init(io);

        for(auto s : _sensors) {
            s->initSensor(_interval);
        }

        _entity->initEntity(io);

        this->execOnInit();
    }

    /**
     * @brief Start the sensor group (i.e. start collecting data).
     *
     * @details This method must not be overwritten. See execOnStart() if custom
     *          actions are required during startup.
     */
    virtual void start() final override {
        if (_keepRunning) {
            //we have been started already
            LOG(info) << "Sensorgroup " << _groupName << " already running.";
            return;
        }

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        if (!this->execOnStart()) {
            LOG(error) << "Sensorgroup " << _groupName << ": Startup failed.";
            return;
        }
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        if (_entity) {
            _keepRunning = true;
            _pendingTasks++;
            _timer->async_wait(_entity->getStrand()->wrap(std::bind(&SensorGroupTemplate::readAsync, this)));
            LOG(info) << "Sensorgroup " << _groupName << " started.";
        } else {
            LOG(error) << "No entity set for group " << _groupName << "! Cannot start polling.";
        }
    }

    /**
     * @brief Stop the sensor group (i.e. stop collecting data).
     *
     * @details This method must not be overwritten. See execOnStop() if custom
     *          actions are required during shutdown.
     */
    virtual void stop() final override {
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        if (!_keepRunning) {
            LOG(info) << "Sensorgroup " << _groupName << " already stopped.";
            return;
        }

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        _keepRunning = false;
        //cancel any outstanding readAsync()
        _timer->cancel();
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        wait();
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        this->execOnStop();
        LOG(info) << "Sensorgroup " << _groupName << " stopped.";
    }

    /**
     * @brief Add a sensor to this group.
     *
     * @details Not intended to be overwritten.
     *
     * @param s Shared pointer to the sensor.
     */
	virtual void pushBackSensor(SBasePtr s) final override {
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		//check if dynamic cast returns nullptr
		if (S_Ptr dSensor = std::dynamic_pointer_cast<S>(s)) {
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			_sensors.push_back(dSensor);
			_baseSensors.push_back(s);
		} else {
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			LOG(warning) << "Group " << _groupName << ": Type mismatch when storing sensor! Sensor omitted";
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		}
	}

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	/**
     * @brief Retrieve all sensors of this group.
     *
     * @details Not intended to be overwritten.
     *
     * @return A std::vector with shared pointers to all associated sensors.
     */
	virtual std::vector<SBasePtr>& getSensors() final override { return _baseSensors; }
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	/**
     * @brief Print SensorGroup configuration.
     *
     * @details Always call %SensorGroupTemplate::printConfig() to print
     *          complete configuration of a sensor group. This method takes
     *          care of calling SensorGroupInterface::printConfig() and
     *          derived %printConfig() methods in correct order.
     *
     * @param ll Log severity level to be used from logger.
     */
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	virtual void printConfig(LOG_LEVEL ll) final override {
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	    //print common base attributes
	    SensorGroupInterface::printConfig(ll);
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	    //print plugin specific group attributes
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	    this->printGroupConfig(ll);
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        if (_entity) {
            LOG_VAR(ll) << "            Entity " << _entity->getEntityName();
        } else {
            LOG_VAR(ll) << "            No entity set!";
        }

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	    //print associated sensors
        LOG_VAR(ll) << "            Sensors:";
        for(auto s : _sensors) {
            s->SensorBase::printConfig(ll, lg);
            s->printConfig(ll, lg);
        }
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	}

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protected:
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	/**
     * @brief Asynchronous callback if _timer expires.
     *
     * @details Issues a read() and sets the timer again if _keepRunning is true.
     *          Not intended to be overwritten.
     */
	void readAsync() final override {
	    this->read();
	    if (_timer && _keepRunning) {
	        _timer->expires_at(timestamp2ptime(nextReadingTime()));
	        _pendingTasks++;
	        _timer->async_wait(_entity->getStrand()->wrap(std::bind(&SensorGroupTemplate::readAsync, this)));
	    }
	    _pendingTasks--;
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	}

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	//TODO move common logic to interface
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	///@name Can be overwritten
	///@{
	/**
     * @brief Implement plugin specific actions to initialize a group here.
     *
     * @details If a derived class (i.e. a plugin group) requires further custom
     *          actions for initialization, this should be implemented here.
     *          %initGroup() is appropriately called by this template during
     *          init().
     */
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	virtual void execOnInit() { /* do nothing if not overwritten */ }
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    /**
     * @brief Implement plugin specific actions to start a group here.
     *
     * @details If a derived class (i.e. a plugin group) requires further custom
     *          actions to start polling data (e.g. open a file descriptor),
     *          this should be implemented here. %startGroup() is appropriately
     *          called by this template during start().
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     *
     * @return True on success, false otherwise.
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     */
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    virtual bool execOnStart() { return true; }
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    /**
     * @brief Implement plugin specific actions to stop a group here.
     *
     * @details If a derived class (i.e. a plugin group) requires further custom
     *          actions to stop polling data (e.g. close a file descriptor),
     *          this should be implemented here. %stopGroup() is appropriately
     *          called by this template during stop().
     */
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    virtual void execOnStop() { /* do nothing if not overwritten */ }
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    ///@}

	std::vector<S_Ptr>    _sensors; ///< Sensors associated with this group
	std::vector<SBasePtr> _baseSensors; ///< Maintain vector with SensorBase pointers for fast getSensors() implementation
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	E*                    _entity; ///< Entity this group is associated to
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};

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////////////////////////////////////////////////////////////////////////////////
// Partial template specialization for E = nullptr_t
////////////////////////////////////////////////////////////////////////////////


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//TODO cross reference general template in doxygen docs
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/**
 * @brief Interface partial template specialization for sensor group
 *        implementations without entities.
 *
 * @details There is a general template for groups with entities. Common code
 *          has to be duplicated and maintained twice here and in the general
 *          template. However, having two templates for cases with and without
 *          entities greatly reduces code duplication in derived plugin sensor
 *          groups.
 *
 * @ingroup pusherplugins
 */
template <class S>
class SensorGroupTemplate<S, nullptr_t> : public SensorGroupInterface {
    //the template shall only be instantiated for classes which derive from SensorBase
    static_assert(std::is_base_of<SensorBase, S>::value, "S must derive from SensorBase!");

protected:
    using S_Ptr = std::shared_ptr<S>;

public:
    SensorGroupTemplate(const std::string groupName) :
        SensorGroupInterface(groupName){}

    SensorGroupTemplate(const SensorGroupTemplate& other) :
        SensorGroupInterface(other){

        for(auto s : other._sensors) {
            S_Ptr sensor = std::make_shared<S>(*s);
            _sensors.push_back(sensor);
            _baseSensors.push_back(sensor);
        }
    }

    virtual ~SensorGroupTemplate() {
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        if(_keepRunning) {
            stop();
        }

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        _sensors.clear();
        _baseSensors.clear();
    }

    SensorGroupTemplate& operator=(const SensorGroupTemplate& other) {
        SensorGroupInterface::operator=(other);
        _sensors.clear();
        _baseSensors.clear();

        for(auto s : other._sensors) {
            S_Ptr sensor = std::make_shared<S>(*s);
            _sensors.push_back(sensor);
            _baseSensors.push_back(sensor);
        }

        return *this;
    }

    /**
     * @brief Initialize the sensor group.
     *
     * @details This method must not be overwritten. See execOnInit() if custom
     *          actions are required during initialization. Initializes
     *          associated sensors and entity.
     *
     * @param io IO service to initialize the timer with.
     */
    virtual void init(boost::asio::io_service& io) final override {
        SensorGroupInterface::init(io);

        for(auto s : _sensors) {
            s->initSensor(_interval);
        }

        this->execOnInit();
    }

    /**
     * @brief Start the sensor group (i.e. start collecting data).
     *
     * @details This method must not be overwritten. See execOnStart() if custom
     *          actions are required during startup.
     */
    virtual void start() final override {
        if (_keepRunning) {
            //we have been started already
            LOG(info) << "Sensorgroup " << _groupName << " already running.";
            return;
        }

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        if (!this->execOnStart()) {
            LOG(error) << "Sensorgroup " << _groupName << ": Startup failed.";
            return;
        }
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        _keepRunning = true;
        _pendingTasks++;
        _timer->async_wait(std::bind(&SensorGroupTemplate::readAsync, this));
        LOG(info) << "Sensorgroup " << _groupName << " started.";
    }

    /**
     * @brief Stop the sensor group (i.e. stop collecting data).
     *
     * @details This method must not be overwritten. See execOnStop() if custom
     *          actions are required during shutdown.
     */
    virtual void stop() final override {
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        if (!_keepRunning) {
            LOG(info) << "Sensorgroup " << _groupName << " already stopped.";
            return;
        }

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        _keepRunning = false;
        //cancel any outstanding readAsync()
        _timer->cancel();
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        wait();
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        this->execOnStop();
        LOG(info) << "Sensorgroup " << _groupName << " stopped.";
    }

    /**
     * @brief Add a sensor to this group.
     *
     * @details Not intended to be overwritten.
     *
     * @param s Shared pointer to the sensor.
     */
    virtual void pushBackSensor(SBasePtr s) final override {
        //check if dynamic cast returns nullptr
        if (S_Ptr dSensor = std::dynamic_pointer_cast<S>(s)) {
            _sensors.push_back(dSensor);
            _baseSensors.push_back(s);
        } else {
            LOG(warning) << "Group " << _groupName << ": Type mismatch when storing sensor! Sensor omitted";
        }
    }

    /**
     * @brief Retrieve all sensors of this group.
     *
     * @details Not intended to be overwritten.
     *
     * @return A std::vector with shared pointers to all associated sensors.
     */
    virtual std::vector<SBasePtr>& getSensors() final override { return _baseSensors; }

    /**
     * @brief Print SensorGroup configuration.
     *
     * @details Always call %SensorGroupTemplate::printConfig() to print
     *          complete configuration of a sensor group. This method takes
     *          care of calling SensorGroupInterface::printConfig() and
     *          derived %printConfig() methods in correct order.
     *
     * @param ll Log severity level to be used from logger.
     */
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    virtual void printConfig(LOG_LEVEL ll) final override {
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        //print common base attributes
        SensorGroupInterface::printConfig(ll);

        //print plugin specific group attributes
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        this->printGroupConfig(ll);
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        //print associated sensors
        LOG_VAR(ll) << "            Sensors:";
        for(auto s : _sensors) {
            s->SensorBase::printConfig(ll, lg);
            s->printConfig(ll, lg);
        }
    }

protected:

    /**
     * @brief Asynchronous callback if _timer expires.
     *
     * @details Issues a read() and sets the timer again if _keepRunning is true.
     *          Not intended to be overwritten.
     */
    void readAsync() final override {
        this->read();
        if (_timer && _keepRunning) {
            _timer->expires_at(timestamp2ptime(nextReadingTime()));
            _pendingTasks++;
            _timer->async_wait(std::bind(&SensorGroupTemplate::readAsync, this));
        }
        _pendingTasks--;
    }

    ///@name Can be overwritten
    ///@{
    /**
     * @brief Implement plugin specific actions to initialize a group here.
     *
     * @details If a derived class (i.e. a plugin group) requires further custom
     *          actions for initialization, this should be implemented here.
     *          %initGroup() is appropriately called by this template during
     *          init().
     */
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    virtual void execOnInit() { /* do nothing if not overwritten */ }
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    /**
     * @brief Implement plugin specific actions to start a group here.
     *
     * @details If a derived class (i.e. a plugin group) requires further custom
     *          actions to start polling data (e.g. open a file descriptor),
     *          this should be implemented here. %startGroup() is appropriately
     *          called by this template during start().
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     *
     * @return True on success, false otherwise.
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     */
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    virtual bool execOnStart() { return true; }
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    /**
     * @brief Implement plugin specific actions to stop a group here.
     *
     * @details If a derived class (i.e. a plugin group) requires further custom
     *          actions to stop polling data (e.g. close a file descriptor),
     *          this should be implemented here. %stopGroup() is appropriately
     *          called by this template during stop().
     */
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    virtual void execOnStop() { /* do nothing if not overwritten */ }
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    ///@}

    std::vector<S_Ptr>    _sensors; ///< Sensors associated with this group
    std::vector<SBasePtr> _baseSensors; ///< Maintain vector with SensorBase pointers for fast getSensors() implementation
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};

#endif /* SENSORGROUPTEMPLATE_H_ */