[Story] 🦀 Event cache storage

[manuroe]

Description

• As a user
• I do not want the app to reload timeline content every time
• So that I enjoy a snappy app with timeline instantly displayed

This project is about to make the existing Event Cache API persistent. The event cache exists but it is a in-memory cache. We want it to be a on-disk cache.

Acceptance criteria

• Live timeline events are permanently cached
• This cache is reset in case of a gap in the timeline
• The room list pre-fills this cache with X last messages so that the timeline instantly displays when the user opens a room
• More to be discussed

Leads

• Tech: @Hywan
• Design:

Size estimate

None

Dependencies

• None

Out of scope

• Preload the cache from the notification service

Open questions

Questions

Beta Give feedback

No tasks being tracked yet.

Subtasks

Android

Beta Give feedback

No tasks being tracked yet.

iOS

Beta Give feedback

No tasks being tracked yet.

Rust

Beta Give feedback

1. [meta] EventCache storage, story of a plan matrix-org/matrix-rust-sdk#3280
   +0

Other

Beta Give feedback

No tasks being tracked yet.

Sign-off

Android

• Design sign-off on completion
• QA sign-off on completion
• Product sign-off on completion

iOS

• Design sign-off on completion
• QA sign-off on completion
• Product sign-off on completion

[Hywan]

This cache is reset in case of a gap in the timeline

Why? We get gaps pretty often, what's the goal of this feature?

The room list pre-fills this cache with X last messages so that the timeline instantly displays when the user opens a room

It has nothing to do with the event cache storage right? It's a sync requirement (which is already present).

[Hywan]

The full issue that describes all the work is matrix-org/matrix-rust-sdk#3280.