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Implement a new `struct Layer` abstraction which manages downloadness internally, requiring no LayerMap locking or rewriting to download or evict providing a property "you have a layer, you can read it". The new `struct Layer` provides ability to keep the file resident via a RAII structure for new layers which still need to be uploaded. Previous solution solved this `RemoteTimelineClient::wait_completion` which lead to bugs like #5639. Evicting or the final local deletion after garbage collection is done using Arc'd value `Drop`. With a single `struct Layer` the closed open ended `trait Layer`, `trait PersistentLayer` and `struct RemoteLayer` are removed following noting that compaction could be simplified by simply not using any of the traits in between: #4839. The new `struct Layer` is a preliminary to remove `Timeline::layer_removal_cs` documented in #4745. Preliminaries: #4936, #4937, #5013, #5014, #5022, #5033, #5044, #5058, #5059, #5061, #5074, #5103, epic #5172, #5645, #5649. Related split off: #5057, #5134.
2 lines
27 B
Rust
2 lines
27 B
Rust
pub mod heavier_once_cell;
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