message_queue.h

/*************************************************************************/
/*  message_queue.h                                                      */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
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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,
        FLAG_SHOW_ERROR=1<<14,
        FLAG_MASK=FLAG_SHOW_ERROR-1

    };

    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;

    void _call_function(Object* p_target,const StringName& p_func,const Variant *p_args,int p_argcount,bool p_show_error);

    static MessageQueue *singleton;
public:

    static MessageQueue *get_singleton();

    Error push_call(ObjectID p_id,const StringName& p_method,const Variant** p_args,int p_argcount,bool p_show_error=false);
    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