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SystemBase.hpp
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/*******************************************************************************
*
* File: SystemBase.hpp
*
* Contents: Declaration of the base implementation of the System interface.
*
* Copyright 2017
*
* Author: David Juhasz (david.juhasz@tuwien.ac.at)
*
******************************************************************************/
#ifndef ROSA_CORE_SYSTEMBASE_HPP
#define ROSA_CORE_SYSTEMBASE_HPP
#include "rosa/core/System.hpp"
#include <atomic>
namespace rosa {
// Base implementation of the System interface, that provides only the name of
// the System, identifiers for Units, and marking the System cleaned for
// destruction.
// NOTE: Actual implementations of the System and derived interfaces are
// supposed to inherit from this base implementation.
class SystemBase : public System {
protected:
// Protected ctor, only subclasses can instantiate.
SystemBase(const std::string &Name) noexcept;
public:
// Dtor.
// PRE: isSystemCleaned()
~SystemBase(void);
protected:
// The textual name of the System.
const std::string Name;
private:
// Number of Units constructed in the system.
// NOTE: Should never be decremented!
std::atomic<size_t> UnitCount;
// Indicates that the System has been cleaned and is ready for destruction.
// The field is initialized as 'false' and can be set by the member function
// markCleaned.
// Subclasses must set the flag upon destroying the System instance, which
// indicates to the destructor of the base-class that all the managed
// resources has been properly released.
std::atomic<bool> SystemIsCleaned;
public:
// Returns a referene to the Name field.
const std::string &name(void) const noexcept override;
protected:
// Tells the next Id to be used for a newly created Unit while
// incrementing the value in field UnitCount.
// NOTE: This is the only function modifying the member field UnitCount.
id_t nextId(void) noexcept override;
// Returns the value of SystemIsCleaned flag.
bool isSystemCleaned(void) const noexcept override;
// Sets SystemIsCleaned flag.
// PRE: !isSystemCleaned() && empty()
// POST: isSystemCleaned
void markCleaned(void) noexcept override;
// Returns the number of Units constructed in the System so far,
// including those being already destroyed.
size_t numberOfConstructedUnits(void) const noexcept override;
};
} // End namespace rosa
#endif // ROSA_LIB_CORE_SYSTEMBASE_HPP

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