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node_modules/rxjs/_esm2015/operators/bufferWhen.js

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+import { Subscription } from '../Subscription';
+import { tryCatch } from '../util/tryCatch';
+import { errorObject } from '../util/errorObject';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+/**
+ * Buffers the source Observable values, using a factory function of closing
+ * Observables to determine when to close, emit, and reset the buffer.
+ *
+ * <span class="informal">Collects values from the past as an array. When it
+ * starts collecting values, it calls a function that returns an Observable that
+ * tells when to close the buffer and restart collecting.</span>
+ *
+ * <img src="./img/bufferWhen.png" width="100%">
+ *
+ * Opens a buffer immediately, then closes the buffer when the observable
+ * returned by calling `closingSelector` function emits a value. When it closes
+ * the buffer, it immediately opens a new buffer and repeats the process.
+ *
+ * @example <caption>Emit an array of the last clicks every [1-5] random seconds</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var buffered = clicks.bufferWhen(() =>
+ *   Rx.Observable.interval(1000 + Math.random() * 4000)
+ * );
+ * buffered.subscribe(x => console.log(x));
+ *
+ * @see {@link buffer}
+ * @see {@link bufferCount}
+ * @see {@link bufferTime}
+ * @see {@link bufferToggle}
+ * @see {@link windowWhen}
+ *
+ * @param {function(): Observable} closingSelector A function that takes no
+ * arguments and returns an Observable that signals buffer closure.
+ * @return {Observable<T[]>} An observable of arrays of buffered values.
+ * @method bufferWhen
+ * @owner Observable
+ */
+export function bufferWhen(closingSelector) {
+    return function (source) {
+        return source.lift(new BufferWhenOperator(closingSelector));
+    };
+}
+class BufferWhenOperator {
+    constructor(closingSelector) {
+        this.closingSelector = closingSelector;
+    }
+    call(subscriber, source) {
+        return source.subscribe(new BufferWhenSubscriber(subscriber, this.closingSelector));
+    }
+}
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+class BufferWhenSubscriber extends OuterSubscriber {
+    constructor(destination, closingSelector) {
+        super(destination);
+        this.closingSelector = closingSelector;
+        this.subscribing = false;
+        this.openBuffer();
+    }
+    _next(value) {
+        this.buffer.push(value);
+    }
+    _complete() {
+        const buffer = this.buffer;
+        if (buffer) {
+            this.destination.next(buffer);
+        }
+        super._complete();
+    }
+    /** @deprecated internal use only */ _unsubscribe() {
+        this.buffer = null;
+        this.subscribing = false;
+    }
+    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
+        this.openBuffer();
+    }
+    notifyComplete() {
+        if (this.subscribing) {
+            this.complete();
+        }
+        else {
+            this.openBuffer();
+        }
+    }
+    openBuffer() {
+        let { closingSubscription } = this;
+        if (closingSubscription) {
+            this.remove(closingSubscription);
+            closingSubscription.unsubscribe();
+        }
+        const buffer = this.buffer;
+        if (this.buffer) {
+            this.destination.next(buffer);
+        }
+        this.buffer = [];
+        const closingNotifier = tryCatch(this.closingSelector)();
+        if (closingNotifier === errorObject) {
+            this.error(errorObject.e);
+        }
+        else {
+            closingSubscription = new Subscription();
+            this.closingSubscription = closingSubscription;
+            this.add(closingSubscription);
+            this.subscribing = true;
+            closingSubscription.add(subscribeToResult(this, closingNotifier));
+            this.subscribing = false;
+        }
+    }
+}
+//# sourceMappingURL=bufferWhen.js.map