godot/core/rid.h

/*************************************************************************/
/*  rid.h                                                                */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
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/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
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/*************************************************************************/
#ifndef RID_H
#define RID_H


#include "safe_refcount.h"
#include "typedefs.h"
#include "os/memory.h"
#include "hash_map.h"
#include "list.h"

/**
	@author Juan Linietsky <reduzio@gmail.com>
*/

class RID_OwnerBase;

typedef uint32_t ID;

class RID {
friend class RID_OwnerBase;
	ID _id;
	RID_OwnerBase *owner;
public:

	_FORCE_INLINE_ ID get_id() const { return _id; }
	bool operator==(const RID& p_rid) const {

		return _id==p_rid._id;
	}
	_FORCE_INLINE_ bool operator<(const RID& p_rid) const {

		return _id < p_rid._id;
	}
	_FORCE_INLINE_ bool operator<=(const RID& p_rid) const {

		return _id <= p_rid._id;
	}
	_FORCE_INLINE_ bool operator>(const RID& p_rid) const {

		return _id > p_rid._id;
	}
	bool operator!=(const RID& p_rid) const {

		return _id!=p_rid._id;
	}
	_FORCE_INLINE_ bool is_valid() const { return _id>0; }

	operator const void*() const {
		return is_valid() ? this : 0;
	};

	_FORCE_INLINE_ RID() {
		_id = 0;
		owner=0;
	}
};


class RID_OwnerBase {
protected:
friend class RID;
	void set_id(RID& p_rid, ID p_id) const { p_rid._id=p_id; }
	void set_ownage(RID& p_rid) const { p_rid.owner=const_cast<RID_OwnerBase*>(this); }
	ID new_ID();
public:

	virtual bool owns(const RID& p_rid) const=0;
	virtual void get_owned_list(List<RID> *p_owned) const=0;

	static void init_rid();

	virtual ~RID_OwnerBase() {}
};

template<class T,bool thread_safe=false>
class RID_Owner : public RID_OwnerBase {
public:

	typedef void (*ReleaseNotifyFunc)(void*user,T *p_data);
private:

	Mutex *mutex;
	mutable HashMap<ID,T*> id_map;

public:

	RID make_rid(T * p_data) {

		if (thread_safe) {
			mutex->lock();
		}

		ID id = new_ID();
		id_map[id]=p_data;
		RID rid;
		set_id(rid,id);
		set_ownage(rid);

		if (thread_safe) {
			mutex->unlock();
		}

		return rid;
	}

	_FORCE_INLINE_ T * get(const RID& p_rid) {

		if (thread_safe) {
			mutex->lock();
		}

		T**elem = id_map.getptr(p_rid.get_id());

		if (thread_safe) {
			mutex->unlock();
		}

		ERR_FAIL_COND_V(!elem,NULL);

		return *elem;

	}

	virtual bool owns(const RID& p_rid) const {

		if (thread_safe) {
			mutex->lock();
		}

		T**elem = id_map.getptr(p_rid.get_id());

		if (thread_safe) {
			mutex->lock();
		}

		return elem!=NULL;
	}

	virtual void free(RID p_rid) {

		if (thread_safe) {
			mutex->lock();
		}
		ERR_FAIL_COND(!owns(p_rid));
		id_map.erase(p_rid.get_id());
	}
	virtual void get_owned_list(List<RID> *p_owned) const {

		if (thread_safe) {
			mutex->lock();
		}

		const ID*id=NULL;
		while((id=id_map.next(id))) {

			RID rid;
			set_id(rid,*id);
			set_ownage(rid);
			p_owned->push_back(rid);

		}

		if (thread_safe) {
			mutex->lock();
		}

	}
	RID_Owner() {

		if (thread_safe) {

			mutex = Mutex::create();
		}

	}


	~RID_Owner() {

		if (thread_safe) {

			memdelete(mutex);
		}
	}
};


#endif