A way to update a existing item in a binn obj?

[matt-jones-spacemicro-com]

Hello binn developers ;)

I am really liking the work you have done on this project. I have been using your binn for logging purposes. I now would like to use it to keep track of, update, and record system variables used in my project. The issue I have hit upon is that I would like to update items that already exist in a binn object. Replace a binn value within a object with a new value, or free the value within the object that has the same key I am using and drop the new one into the object. Is this possible with the current state of binn - it didn't look like it is from looking at the source but I could be wrong? Has anyone else developed an addition of this nature to binn that I could use? Or should I look into doing this myself?

Thank you, Matt

[kroggen]

Hi Matt!

Unfortunately the current code does not support updating values inside a binn.

The library is focused on creating serialized data.

Do you plan to save the binn data? Where? Or do you plan to send over some connection? Or just keep the values on memory?

[matt-jones-spacemicro-com]

Hi Bernardo,

I am currently using it to log failure events to my flash file system and dump at a later time. It works wonderful for that. I was just hoping to extend it to being able to save and restore my runtime data - something like you would do in a video game with save and restore. The project I am on is on a pretty tight schedule, so I am not sure I have time to update binn to do what I need - and risk causing problems. Oh, yeah if binn allowed updating then what I would do is keep updating the live - binn created data object on the heap to reflect the runtime state and then every so often write the state data out to the file system - or if i get a indication that power is going away I would dump it out also so it could be restored next power up or after a watchdog reset.

To work around binn not supporting updating - I was thinking of creating a working database that is a reflection of what binn would want - an array of structures that mirror what binn needs, key, data, and type.
On startup restore would pull from a binn object and then fill in found entries in the working database. When the state needs to be saved - I would just write the working database out to a bin object to the file system. Updates would be done on the working - mirror like binn data base - which would get me what I need without modifying binn.

In the past saving and restoring state has been a hardcoded type of affair on embedded systems - based on compile time structures. I liked how binn works, and it seemed the next step to try to use it for saving and restoring the embedded system runtime data to a single binn object and to a single file system file.

Thank you for getting back to me so fast ;) Matt

On 2017-04-27 17:29, Bernardo Ramos wrote:

Hi Matt!

Unfortunately the current code does not support updating values inside a binn.

The library is focused on creating serialized data.

Do you plan to save the binn data? Where? Or do you plan to send over some connection? Or just keep the values on memory?

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[kroggen]

I agree.

Modifying binn will not be so easy, mainly when we have a container inside another, ie, when we want to update an object that is inside a list (or the opposite).

In your case it would be better to load the data to some structure on memory and modify it when needed.

At the time to save the data it can be serialized again and saved to the file.

For objects you can use a hash table (check uthash).

If I had enough time I could implement something on top of binn.

[kroggen]

Oh, your idea of using an array of structures is good.

You can also take a look at SQLite, if it fits on your device.

[matt-jones-spacemicro-com]

Ok great I'll take a look. Thank you very much for getting back to me I very much appreciate it ;)