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node_modules/rxjs/_esm5/operators/exhaust.js

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+/** PURE_IMPORTS_START .._OuterSubscriber,.._util_subscribeToResult PURE_IMPORTS_END */
+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 __());
+};
+import { OuterSubscriber } from '../OuterSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+/**
+ * Converts a higher-order Observable into a first-order Observable by dropping
+ * inner Observables while the previous inner Observable has not yet completed.
+ *
+ * <span class="informal">Flattens an Observable-of-Observables by dropping the
+ * next inner Observables while the current inner is still executing.</span>
+ *
+ * <img src="./img/exhaust.png" width="100%">
+ *
+ * `exhaust` subscribes to an Observable that emits Observables, also known as a
+ * higher-order Observable. Each time it observes one of these emitted inner
+ * Observables, the output Observable begins emitting the items emitted by that
+ * inner Observable. So far, it behaves like {@link mergeAll}. However,
+ * `exhaust` ignores every new inner Observable if the previous Observable has
+ * not yet completed. Once that one completes, it will accept and flatten the
+ * next inner Observable and repeat this process.
+ *
+ * @example <caption>Run a finite timer for each click, only if there is no currently active timer</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var higherOrder = clicks.map((ev) => Rx.Observable.interval(1000).take(5));
+ * var result = higherOrder.exhaust();
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link combineAll}
+ * @see {@link concatAll}
+ * @see {@link switch}
+ * @see {@link mergeAll}
+ * @see {@link exhaustMap}
+ * @see {@link zipAll}
+ *
+ * @return {Observable} An Observable that takes a source of Observables and propagates the first observable
+ * exclusively until it completes before subscribing to the next.
+ * @method exhaust
+ * @owner Observable
+ */
+export function exhaust() {
+    return function (source) { return source.lift(new SwitchFirstOperator()); };
+}
+var SwitchFirstOperator = /*@__PURE__*/ (/*@__PURE__*/ function () {
+    function SwitchFirstOperator() {
+    }
+    SwitchFirstOperator.prototype.call = function (subscriber, source) {
+        return source.subscribe(new SwitchFirstSubscriber(subscriber));
+    };
+    return SwitchFirstOperator;
+}());
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+var SwitchFirstSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
+    __extends(SwitchFirstSubscriber, _super);
+    function SwitchFirstSubscriber(destination) {
+        _super.call(this, destination);
+        this.hasCompleted = false;
+        this.hasSubscription = false;
+    }
+    SwitchFirstSubscriber.prototype._next = function (value) {
+        if (!this.hasSubscription) {
+            this.hasSubscription = true;
+            this.add(subscribeToResult(this, value));
+        }
+    };
+    SwitchFirstSubscriber.prototype._complete = function () {
+        this.hasCompleted = true;
+        if (!this.hasSubscription) {
+            this.destination.complete();
+        }
+    };
+    SwitchFirstSubscriber.prototype.notifyComplete = function (innerSub) {
+        this.remove(innerSub);
+        this.hasSubscription = false;
+        if (this.hasCompleted) {
+            this.destination.complete();
+        }
+    };
+    return SwitchFirstSubscriber;
+}(OuterSubscriber));
+//# sourceMappingURL=exhaust.js.map