Re: [wakaama-dev] object instances management

["Navarro, David" <david.navarro@xxxxxxxxx>]

Hi Simon,

It is true that information may change underneath and wakaaama core may use obsolete data.
I think adding the lwm2m_instanceList_callback_t is a good solution. But the "moving object" should ensure that data are still valid for at least the next read or write callback call.
The two other callbacks you mention are not required as this is already implemented in the core. I try to minimize the burden on object developers.

Let me experiment with this.

Regards,
David Navarro

-----Original Message-----
From: wakaama-dev-bounces@xxxxxxxxxxx [mailto:wakaama-dev-bounces@xxxxxxxxxxx] On Behalf Of Simon Bernard
Sent: Thursday, 28 August, 2014 12:06
To: Wakaama developer discussions
Subject: [wakaama-dev] object instances management

Hi,
  I have some remarks about the object instances management.
  Wakaama need to know the list of instances Id of an object, this information is stored in lwm2m_object_t as a linked list.
  This is a problem for my Lua binding because objects and instances are stored in a lua table. So each time I add or remove an instance, I need to modify the C linked list. This mean Lua table should know C lua_object.c.
   Maybe we could replace the field :

lwm2m_list_t *           instanceList;

   by :

lwm2m_instanceList_callback_t    instanceListFunc;
typedef lwm2m_list_t * (*lwm2m_instanceList_callback_t) (lwm2m_object_t
* objectP);

and optionally :

lwm2m_instanceListSize_callback_t    instanceListSizeFunc;
typedef int    (*lwm2m_instanceListSize_callback_t) (lwm2m_object_t * 
objectP);

lwm2m_isInstanceExist_callback_t    isInstanceExistFunc;
typedef bool (*lwm2m_isInstanceExist_callback_t)   (lwm2m_object_t * 
objectP, uint16_t    instanceId);


In this case, my code could be more dynamic because each time wakaama need to know something about instances I can read it directly in lua table instead of maintaining the C linked list.

Simon
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