work.suroh.tk/node_modules/rxjs/operators/audit.js

118 lines
4.6 KiB
JavaScript

"use strict";
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var tryCatch_1 = require('../util/tryCatch');
var errorObject_1 = require('../util/errorObject');
var OuterSubscriber_1 = require('../OuterSubscriber');
var subscribeToResult_1 = require('../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
*/
function audit(durationSelector) {
return function auditOperatorFunction(source) {
return source.lift(new AuditOperator(durationSelector));
};
}
exports.audit = audit;
var AuditOperator = (function () {
function AuditOperator(durationSelector) {
this.durationSelector = durationSelector;
}
AuditOperator.prototype.call = function (subscriber, source) {
return source.subscribe(new AuditSubscriber(subscriber, this.durationSelector));
};
return AuditOperator;
}());
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
var AuditSubscriber = (function (_super) {
__extends(AuditSubscriber, _super);
function AuditSubscriber(destination, durationSelector) {
_super.call(this, destination);
this.durationSelector = durationSelector;
this.hasValue = false;
}
AuditSubscriber.prototype._next = function (value) {
this.value = value;
this.hasValue = true;
if (!this.throttled) {
var duration = tryCatch_1.tryCatch(this.durationSelector)(value);
if (duration === errorObject_1.errorObject) {
this.destination.error(errorObject_1.errorObject.e);
}
else {
var innerSubscription = subscribeToResult_1.subscribeToResult(this, duration);
if (innerSubscription.closed) {
this.clearThrottle();
}
else {
this.add(this.throttled = innerSubscription);
}
}
}
};
AuditSubscriber.prototype.clearThrottle = function () {
var _a = this, value = _a.value, hasValue = _a.hasValue, throttled = _a.throttled;
if (throttled) {
this.remove(throttled);
this.throttled = null;
throttled.unsubscribe();
}
if (hasValue) {
this.value = null;
this.hasValue = false;
this.destination.next(value);
}
};
AuditSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex) {
this.clearThrottle();
};
AuditSubscriber.prototype.notifyComplete = function () {
this.clearThrottle();
};
return AuditSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
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