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Result cache LRU (#165)

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* Give the result cache some LRU love

* Fixing LRU cache move-to-start, and simplifying
This commit is contained in:
Jake Archibald
2018-09-11 17:31:08 +01:00
committed by GitHub
parent 4db43ccd4e
commit c591f1f37d
1 changed files with 18 additions and 11 deletions
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29
src/components/App/result-cache.ts
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@@ -21,12 +21,13 @@ const SIZE = 5;
export default class ResultCache { export default class ResultCache {
private readonly _entries: CacheEntry[] = []; private readonly _entries: CacheEntry[] = [];
private _nextIndex: number = 0;
add(entry: CacheEntry) { add(entry: CacheEntry) {
if (entry.encoderState.type === identity.type) throw Error('Cannot cache identity encodes'); if (entry.encoderState.type === identity.type) throw Error('Cannot cache identity encodes');
this._entries[this._nextIndex] = entry; // Add the new entry to the start
this._nextIndex = (this._nextIndex + 1) % SIZE; this._entries.unshift(entry);
// Remove the last entry if we're now bigger than SIZE
if (this._entries.length > SIZE) this._entries.pop();
} }
match( match(
@@ -34,7 +35,7 @@ export default class ResultCache {
preprocessorState: PreprocessorState, preprocessorState: PreprocessorState,
encoderState: EncoderState, encoderState: EncoderState,
): CacheResult | undefined { ): CacheResult | undefined {
const matchingEntry = this._entries.find((entry) => { const matchingIndex = this._entries.findIndex((entry) => {
// Check for quick exits: // Check for quick exits:
if (entry.source !== source) return false; if (entry.source !== source) return false;
if (entry.encoderState.type !== encoderState.type) return false; if (entry.encoderState.type !== encoderState.type) return false;
@@ -55,14 +56,20 @@ export default class ResultCache {
return true; return true;
}); });
if (matchingEntry) { if (matchingIndex === -1) return undefined;
return {
bmp: matchingEntry.bmp, const matchingEntry = this._entries[matchingIndex];
preprocessed: matchingEntry.preprocessed,
file: matchingEntry.file, if (matchingIndex !== 0) {
}; // Move the matched result to 1st position (LRU)
this._entries.splice(matchingIndex, 1);
this._entries.unshift(matchingEntry);
} }
return undefined; return {
bmp: matchingEntry.bmp,
preprocessed: matchingEntry.preprocessed,
file: matchingEntry.file,
};
} }
} }