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Introduces Cache helper class.

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Henning Dieterichs 2022-02-18 18:45:12 +01:00
parent 3aafd130ec
commit bfda62fd81
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1 changed files with 34 additions and 24 deletions
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58
src/vs/workbench/contrib/audioCues/browser/audioCueService.ts
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@ -24,11 +24,6 @@ export interface IAudioCueService {
export class AudioCueService extends Disposable implements IAudioCueService {
readonly _serviceBrand: undefined;
private readonly audioCueEnabledObservables = new Map<
AudioCue,
IObservable<boolean>
>();
private readonly screenReaderAttached = fromEvent(
this.accessibilityService.onDidChangeScreenReaderOptimized,
() => this.accessibilityService.isScreenReaderOptimized()
@ -65,27 +60,42 @@ export class AudioCueService extends Disposable implements IAudioCueService {
}
}
private readonly isEnabledCache = new Cache((cue: AudioCue) => {
const settingObservable = fromEvent(
Event.filter(this.configurationService.onDidChangeConfiguration, (e) =>
e.affectsConfiguration(cue.settingsKey)
),
() => this.configurationService.getValue<'on' | 'off' | 'auto'>(cue.settingsKey)
);
return new LazyDerived(reader => {
const setting = settingObservable.read(reader);
if (setting === 'auto') {
return this.screenReaderAttached.read(reader);
} else if (setting === 'on') {
return true;
}
return false;
}, 'audio cue enabled');
});
public isEnabled(cue: AudioCue): IObservable<boolean> {
let observable = this.audioCueEnabledObservables.get(cue);
if (!observable) {
const settingObservable = fromEvent(
Event.filter(this.configurationService.onDidChangeConfiguration, (e) =>
e.affectsConfiguration(cue.settingsKey)
),
() => this.configurationService.getValue<'on' | 'off' | 'auto'>(cue.settingsKey)
);
observable = new LazyDerived(reader => {
const setting = settingObservable.read(reader);
if (setting === 'auto') {
return this.screenReaderAttached.read(reader);
} else if (setting === 'on') {
return true;
}
return false;
}, 'audio cue enabled');
this.audioCueEnabledObservables.set(cue, observable);
return this.isEnabledCache.get(cue);
}
}
class Cache<TArg, TValue> {
private readonly map = new Map<TArg, TValue>();
constructor(private readonly getValue: (value: TArg) => TValue) {
}
public get(arg: TArg): TValue {
if (this.map.has(arg)) {
return this.map.get(arg)!;
}
return observable;
const value = this.getValue(arg);
this.map.set(arg, value);
return value;
}
}