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refactor: remove unused surface invalidation

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Tianyi Cui
2026-07-14 12:48:19 +08:00
parent b0e9c595b7
commit 458f87ea03
1 changed files with 7 additions and 20 deletions
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27
packages/core/session/src/surface.ts
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@@ -196,31 +196,18 @@ export function foldSurface(events: readonly SessionEvent[]): SurfaceFoldResult
export class SurfaceManager {
/** Incremental state shared with the complete surface fold. */
private _state = createFoldState()
/** The last processed seq. -1 forces a full rebuild on first access. */
/** The last processed seq. -1 forces the initial full fold. */
private _lastProcessedSeq = -1
constructor(private log: readonly SessionEvent[]) {}
/**
* Reset to unprocessed state. Call after the log has been replaced
* wholesale (e.g. after Session seed). Not needed for normal appends —
* those are picked up incrementally.
*/
invalidate(): void {
this._lastProcessedSeq = -1
// A wholesale rebuild is a rewrite: bump the generation so incremental
// consumers (the session's derived-message cache) discard their view.
this._state = createFoldState(this._state.replaceGeneration + 1)
}
/**
* The surface's rewrite generation: bumped by every folded `replace` op and
* by {@link invalidate}. A replace is the ONE operation that rewrites the
* surface non-monotonically, so an incremental consumer of {@link nodes}
* (the session's derived-message cache) compares this between visits — an
* unchanged generation guarantees every node it has not seen is a pure tail
* append; a changed one means its view must rebuild. Monotonic: it never
* moves backwards, so comparisons cannot be fooled by a re-fold.
* The surface's rewrite generation, bumped by every folded `replace` op. A
* replace is the ONE operation that rewrites the surface non-monotonically,
* so an incremental consumer of {@link nodes} (the session's derived-message
* cache) compares this between visits — an unchanged generation guarantees
* every unseen node is a pure tail append; a changed one means its view must
* rebuild.
*/
get replaceGeneration(): number {
if (this._lastProcessedSeq < this.log.length - 1) this._processDelta()