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node_modules/rxjs/_esm2015/operators/sampleTime.js

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+import { Subscriber } from '../Subscriber';
+import { async } from '../scheduler/async';
+/**
+ * Emits the most recently emitted value from the source Observable within
+ * periodic time intervals.
+ *
+ * <span class="informal">Samples the source Observable at periodic time
+ * intervals, emitting what it samples.</span>
+ *
+ * <img src="./img/sampleTime.png" width="100%">
+ *
+ * `sampleTime` periodically looks at the source Observable and emits whichever
+ * value it has most recently emitted since the previous sampling, unless the
+ * source has not emitted anything since the previous sampling. The sampling
+ * happens periodically in time every `period` milliseconds (or the time unit
+ * defined by the optional `scheduler` argument). The sampling starts as soon as
+ * the output Observable is subscribed.
+ *
+ * @example <caption>Every second, emit the most recent click at most once</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var result = clicks.sampleTime(1000);
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link auditTime}
+ * @see {@link debounceTime}
+ * @see {@link delay}
+ * @see {@link sample}
+ * @see {@link throttleTime}
+ *
+ * @param {number} period The sampling period expressed in milliseconds or the
+ * time unit determined internally by the optional `scheduler`.
+ * @param {Scheduler} [scheduler=async] The {@link IScheduler} to use for
+ * managing the timers that handle the sampling.
+ * @return {Observable<T>} An Observable that emits the results of sampling the
+ * values emitted by the source Observable at the specified time interval.
+ * @method sampleTime
+ * @owner Observable
+ */
+export function sampleTime(period, scheduler = async) {
+    return (source) => source.lift(new SampleTimeOperator(period, scheduler));
+}
+class SampleTimeOperator {
+    constructor(period, scheduler) {
+        this.period = period;
+        this.scheduler = scheduler;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new SampleTimeSubscriber(subscriber, this.period, this.scheduler));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class SampleTimeSubscriber extends Subscriber {
+    constructor(destination, period, scheduler) {
+        super(destination);
+        this.period = period;
+        this.scheduler = scheduler;
+        this.hasValue = false;
+        this.add(scheduler.schedule(dispatchNotification, period, { subscriber: this, period }));
+    }
+    _next(value) {
+        this.lastValue = value;
+        this.hasValue = true;
+    }
+    notifyNext() {
+        if (this.hasValue) {
+            this.hasValue = false;
+            this.destination.next(this.lastValue);
+        }
+    }
+}
+function dispatchNotification(state) {
+    let { subscriber, period } = state;
+    subscriber.notifyNext();
+    this.schedule(state, period);
+}
+//# sourceMappingURL=sampleTime.js.map