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SystemImpl.hpp
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/***************************************************************************//**
*
* \file core/SystemImpl.hpp
*
* \author David Juhasz (david.juhasz@tuwien.ac.at)
*
* \date 2017
*
* \brief Declaration of a basic implementation of the `rosa::System` interface.
*
******************************************************************************/
#ifndef ROSA_LIB_CORE_SYSTEMIMPL_HPP // NOLINT
#define ROSA_LIB_CORE_SYSTEMIMPL_HPP
#include "rosa/core/SystemBase.hpp"
#include <mutex>
#include <unordered_set>
namespace rosa {
/// A basic implementation of the `rosa::System` interface, which is based on
/// `rosa::SystemBase`and simply stores `rosa::Unit` instances in a set.
class SystemImpl : public SystemBase {
public:
/// Creates a new instance.
///
/// \param Name name of the new instance
SystemImpl(const std::string &Name) noexcept;
/// Destroys `this` object.
///
/// \note The destructor deallocates internal resources and marks `this`
/// object cleaned.
///
/// \pre No live `rosa::Unit` instances are managed by `this`
/// object:\code
/// empty()
/// \endcode
~SystemImpl(void);
private:
/// Stores references for the registered `rosa::Unit` instances.
std::unordered_set<Unit *> Units;
/// Provides mutual exclusion when modifying `rosa::Unit` instances.
std::mutex RegisterMutex;
protected:
/// Registers a `rosa::Unit` instance to `this` object.
///
/// \param U `rosa::Unit` to register
///
/// \pre `this` object has not yet been marked as cleaned and `U` is not
/// registered yet:\code
/// !isSystemCleaned() && !isUnitRegistered(U)
/// \endcode
///
/// \post `U` is registered:\code
/// isUnitRegistered(U)
/// \endcode
void registerUnit(Unit &U) noexcept override;
/// Unregisters and destroys a registered `rosa::Unit` instance.
///
/// \param U `rosa::Unit` to destroy
///
/// \pre `U` is registered:\code
/// isUnitRegistered(U)
/// \endcode
///
/// \post `U` is not registered:\code
/// !isUnitRegistered(U)
/// \endcode Moreover, `U` is destroyed.
void destroyUnit(Unit &U) noexcept override;
/// Tells if a `rosa::Unit` is registered in `this` object.
///
/// \param U `rosa::Unit` to check
///
/// \return whether `U` is registered in `this` object
bool isUnitRegistered(const Unit &U) const noexcept override;
public:
/// Tells the number of live `rosa::Unit` instances in the context `this`
/// object, those being constructed and not destroyed yet.
///
/// \return number of `rosa::Unit` instances alive
size_t numberOfLiveUnits(void) const noexcept override;
/// Tells if `this` object has no live `rosa::Unit` instances.
///
/// \return whether `this` object has any live `rosa::Unit` instances
bool empty(void) const noexcept override;
};
} // End namespace rosa
#endif // ROSA_LIB_CORE_SYSTEMIMPL_HPP

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