godot/core/message_queue.h

/*************************************************************************/
/*  message_queue.h                                                      */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* the following conditions:                                             */
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/*************************************************************************/
#ifndef MESSAGE_QUEUE_H
#define MESSAGE_QUEUE_H

#include "object.h"
#include "os/mutex.h"
#include "os/thread_safe.h"
class MessageQueue {

	_THREAD_SAFE_CLASS_

	enum {

        DEFAULT_QUEUE_SIZE_KB=1024
	};

	Mutex *mutex;

	enum {
		TYPE_CALL,
		TYPE_NOTIFICATION,
		TYPE_SET
	};

	struct Message {

		ObjectID instance_ID;
		StringName target;
		int16_t type;
		union {
			int16_t notification;
			int16_t args;
		};
	};

	uint8_t *buffer;
	uint32_t buffer_end;
	uint32_t buffer_max_used;
	uint32_t buffer_size;


	static MessageQueue *singleton;
public:

	static MessageQueue *get_singleton();

	Error push_call(ObjectID p_id, const StringName& p_method, VARIANT_ARG_LIST);
	Error push_notification(ObjectID p_id, int p_notification);
	Error push_set(ObjectID p_id, const StringName& p_prop, const Variant& p_value);

	Error push_call(Object *p_object, const StringName& p_method, VARIANT_ARG_LIST);
	Error push_notification(Object *p_object, int p_notification);
	Error push_set(Object *p_object, const StringName& p_prop, const Variant& p_value);

	bool print();
	void statistics();
	void flush();

	int get_max_buffer_usage() const;

	MessageQueue();
	~MessageQueue();
};

#endif // MESSAGE_QUEUE_H