108 lines
3.9 KiB
JavaScript
Executable File
108 lines
3.9 KiB
JavaScript
Executable File
import { tryCatch } from '../util/tryCatch';
|
|
import { errorObject } from '../util/errorObject';
|
|
import { OuterSubscriber } from '../OuterSubscriber';
|
|
import { subscribeToResult } from '../util/subscribeToResult';
|
|
/**
|
|
* Ignores source values for a duration determined by another Observable, then
|
|
* emits the most recent value from the source Observable, then repeats this
|
|
* process.
|
|
*
|
|
* <span class="informal">It's like {@link auditTime}, but the silencing
|
|
* duration is determined by a second Observable.</span>
|
|
*
|
|
* <img src="./img/audit.png" width="100%">
|
|
*
|
|
* `audit` is similar to `throttle`, but emits the last value from the silenced
|
|
* time window, instead of the first value. `audit` emits the most recent value
|
|
* from the source Observable on the output Observable as soon as its internal
|
|
* timer becomes disabled, and ignores source values while the timer is enabled.
|
|
* Initially, the timer is disabled. As soon as the first source value arrives,
|
|
* the timer is enabled by calling the `durationSelector` function with the
|
|
* source value, which returns the "duration" Observable. When the duration
|
|
* Observable emits a value or completes, the timer is disabled, then the most
|
|
* recent source value is emitted on the output Observable, and this process
|
|
* repeats for the next source value.
|
|
*
|
|
* @example <caption>Emit clicks at a rate of at most one click per second</caption>
|
|
* var clicks = Rx.Observable.fromEvent(document, 'click');
|
|
* var result = clicks.audit(ev => Rx.Observable.interval(1000));
|
|
* result.subscribe(x => console.log(x));
|
|
*
|
|
* @see {@link auditTime}
|
|
* @see {@link debounce}
|
|
* @see {@link delayWhen}
|
|
* @see {@link sample}
|
|
* @see {@link throttle}
|
|
*
|
|
* @param {function(value: T): SubscribableOrPromise} durationSelector A function
|
|
* that receives a value from the source Observable, for computing the silencing
|
|
* duration, returned as an Observable or a Promise.
|
|
* @return {Observable<T>} An Observable that performs rate-limiting of
|
|
* emissions from the source Observable.
|
|
* @method audit
|
|
* @owner Observable
|
|
*/
|
|
export function audit(durationSelector) {
|
|
return function auditOperatorFunction(source) {
|
|
return source.lift(new AuditOperator(durationSelector));
|
|
};
|
|
}
|
|
class AuditOperator {
|
|
constructor(durationSelector) {
|
|
this.durationSelector = durationSelector;
|
|
}
|
|
call(subscriber, source) {
|
|
return source.subscribe(new AuditSubscriber(subscriber, this.durationSelector));
|
|
}
|
|
}
|
|
/**
|
|
* We need this JSDoc comment for affecting ESDoc.
|
|
* @ignore
|
|
* @extends {Ignored}
|
|
*/
|
|
class AuditSubscriber extends OuterSubscriber {
|
|
constructor(destination, durationSelector) {
|
|
super(destination);
|
|
this.durationSelector = durationSelector;
|
|
this.hasValue = false;
|
|
}
|
|
_next(value) {
|
|
this.value = value;
|
|
this.hasValue = true;
|
|
if (!this.throttled) {
|
|
const duration = tryCatch(this.durationSelector)(value);
|
|
if (duration === errorObject) {
|
|
this.destination.error(errorObject.e);
|
|
}
|
|
else {
|
|
const innerSubscription = subscribeToResult(this, duration);
|
|
if (innerSubscription.closed) {
|
|
this.clearThrottle();
|
|
}
|
|
else {
|
|
this.add(this.throttled = innerSubscription);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
clearThrottle() {
|
|
const { value, hasValue, throttled } = this;
|
|
if (throttled) {
|
|
this.remove(throttled);
|
|
this.throttled = null;
|
|
throttled.unsubscribe();
|
|
}
|
|
if (hasValue) {
|
|
this.value = null;
|
|
this.hasValue = false;
|
|
this.destination.next(value);
|
|
}
|
|
}
|
|
notifyNext(outerValue, innerValue, outerIndex, innerIndex) {
|
|
this.clearThrottle();
|
|
}
|
|
notifyComplete() {
|
|
this.clearThrottle();
|
|
}
|
|
}
|
|
//# sourceMappingURL=audit.js.map
|