request things only as needed

[deltachat]

request things only as needed

[okdistribute]

The desktop app now only loads messages when you click on a chat. Could still be optimized to only fetch messages in view.

[r10s]

added these information also do the docs, see deltachat/deltachat-core@1a51676

[hpk42]

indeed i have a chat with [email protected] with a couple hundred messages and it loads slowly. I think the dc_get_chat_msgs() is fast and only returns a list of msg-ids but then fetching each message takes time. If only the messages in view are fetched i think it'll be super-fast as well like other chats with only 20-30 messages.

[ralphtheninja]

What would a "get messages only in view"-algorithm look like? We might want to start thinking about this soonish for desktop. When does dc_get_chat_msgs() become slow? If this remains fast we can keep using it to get the ids and implement something to get a range of ids. Maybe the core could also take a range as input and return a range of messages.

[hpk42]

On Wed, Oct 24, 2018 at 00:32 -0700, Lars-Magnus Skog wrote: What would a "get messages only in view"-algorithm look like? We might want to start thinking about this soonish for desktop.

don't know the internals of desktop -- but basically it's about only asking for message content on demand, and not fill the whole message-list for chat up-front. note that ``dc_get_chat_msgs()`` is likely fast enough also for 1k message chats, at some point also this function needs to allow returning a window on the list, not the full list. but for now we can assume that function is fine to call and not a speed problem.