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//===-- rosa/core/SystemBase.hpp -----------------------------*- C++ -*-===//
//
// The RoSA Framework
//
//===----------------------------------------------------------------------===//
///
/// \file rosa/core/SystemBase.hpp
///
/// \author David Juhasz (david.juhasz@tuwien.ac.at)
///
/// \date 2017
///
/// \brief Base implementation of the \c rosa::System interface.
///
//===----------------------------------------------------------------------===//
#ifndef ROSA_CORE_SYSTEMBASE_HPP
#define ROSA_CORE_SYSTEMBASE_HPP
#include "rosa/core/System.hpp"
#include <atomic>
namespace rosa {
/// Base implementation of the \c rosa::System interface.
///
/// This implementation provides only equality checking and *name* for
/// \c rosa::System, identifiers for \c rosa::Unit instances, and marking the
/// \c rosa::System cleaned for destruction.
///
/// \note Actual implementations of \c rosa::System and derived interfaces are
/// supposed to inherit from this implementation.
class SystemBase : public System {
protected:
/// Creates an instance.
///
/// \note Protected constructor restrict instantiation for subclasses.
///
/// \param Name name of the new instance
SystemBase(const std::string &Name) noexcept;
public:
/// Destroys \p this object.
///
/// \pre \p this object is marked cleaned:\code
/// isSystemCleaned()
/// \endcode
~SystemBase(void);
/// Tells whether \p this object is the same as \p Other.
///
/// Two \c rosa::System instances are considered equal if they share a common
/// \c rosa::SystemBase::Name member field. That should do among various
/// subclasses.
///
/// \param Other another \c rosa::System instance to compare to
///
/// \return whether \p this object and \p Other is the same
bool operator==(const System &Other) const noexcept override;
protected:
/// The textual name of \p this object implementing \c rosa::System.
const std::string Name;
private:
/// Number of \c rosa::Unit instances constructed by \p this object.
///
/// \note Should never be decremented!
std::atomic<size_t> UnitCount;
/// Indicates that \p this object has been cleaned and is ready for
/// destruction.
///
/// The field is initialized as \c false and can be set by
/// \c rosa::SystemBase::markCleaned.
///
/// \note Subclasses must set the flag upon destructing their instances, which
/// indicates to the destructor of the base-class that all the managed
/// resources has been properly released.
std::atomic<bool> SystemIsCleaned;
public:
/// Tells the name of \p this object
///
/// \note The returned reference remains valid as long as \p this object is
/// not destroyed.
///
/// \return reference to \c rosa::SystemBase::Name
const std::string &name(void) const noexcept override;
protected:
/// Tells the next unique identifier to be used for a newly created
/// \c rosa::Unit.
///
/// The functions takes the current value of the internal counter
/// \c rosa::SystemBase::UnitCount and then increments it.
///
/// \note This is the only function modifying
/// \c rosa::SystemBase::UnitCount.
///
/// \return \c rosa::id_t which is unique within the context of \p this
/// object.
id_t nextId(void) noexcept override;
/// Tells if \p this object has been marked cleaned and is ready for
/// destruction.
///
/// \return if \p this object is marked clean.
bool isSystemCleaned(void) const noexcept override;
/// Marks \p this object cleaned by setting
/// \c rosa::SystemBase::SystemIsCleaned.
///
/// \note Can be called only once when the System does not have any live
/// \c rosa::Unit instances.
///
/// \pre \p this object has not yet been marked as cleaned and it has no
/// \c rosa::Unit instances registered:\code
/// !isSystemCleaned() && empty()
/// \endcode
///
/// \post \p this object is marked cleaned:\code
/// isSystemCleaned()
/// \encode
void markCleaned(void) noexcept override;
/// Tells the number of \c rosa::Unit instances constructed in the context of
/// \p this object so far, including those being already destroyed.
///
/// \return current value of \c rosa::SystemBase::UnitCount that is the number
/// of \c rosa::Unit instances created so far
size_t numberOfConstructedUnits(void) const noexcept override;
};
} // End namespace rosa
#endif // ROSA_LIB_CORE_SYSTEMBASE_HPP

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