SystemImpl.h
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	/*******************************************************************************
	*
	* File: SystemImpl.h
	*
	* Contents: Declaration of a basic implementation of the System interface.
	*
	* Copyright 2017
	*
	* Author: David Juhasz (david.juhasz@tuwien.ac.at)
	*
	******************************************************************************/

	#ifndef ROSA_LIB_CORE_SYSTEMIMPL_H
	#define ROSA_LIB_CORE_SYSTEMIMPL_H

	#include "rosa/core/System.h"
	#include <mutex>
	#include <unordered_set>

	namespace rosa {

	class SystemImpl : public System {
	public:
	SystemImpl(const std::string &Name) noexcept;

	~SystemImpl(void);

	private:
	// Container for keeping reference of registered Units.
	std::unordered_set<Unit *> Units;

	// Used to provide mutual exclusion when modifying Units.
	std::mutex RegisterMutex;

	protected:
	// Registers the given Unit instance to the System.
	// PRE: !isUnitRegistered(U)
	// POST: isUnitRegistered(U)
	void registerUnit(Unit &U) noexcept override;

	// Unregisters and destroys the given Unit.
	// PRE: isUnitRegistered(U)
	// POST: !isUnitRegistered(U) && 'U is destroyed'
	void destroyUnit(Unit &U) noexcept override;

	// Returns if the given Unit is registered in the System.
	bool isUnitRegistered(const Unit &U) const noexcept override;

	public:
	// Returns the number of live Units, that have been constructed and not
	// destroyed yet.
	size_t numberOfLiveUnits(void) const noexcept override;

	// Returns if the System has no live Units.
	bool empty(void) const noexcept override;
	};

	} // End namespace rosa

	#endif // ROSA_LIB_CORE_SYSTEMIMPL_H