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node_modules/rxjs/_esm2015/operators/multicast.js

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+import { connectableObservableDescriptor } from '../observable/ConnectableObservable';
+/* tslint:enable:max-line-length */
+/**
+ * Returns an Observable that emits the results of invoking a specified selector on items
+ * emitted by a ConnectableObservable that shares a single subscription to the underlying stream.
+ *
+ * <img src="./img/multicast.png" width="100%">
+ *
+ * @param {Function|Subject} subjectOrSubjectFactory - Factory function to create an intermediate subject through
+ * which the source sequence's elements will be multicast to the selector function
+ * or Subject to push source elements into.
+ * @param {Function} [selector] - Optional selector function that can use the multicasted source stream
+ * as many times as needed, without causing multiple subscriptions to the source stream.
+ * Subscribers to the given source will receive all notifications of the source from the
+ * time of the subscription forward.
+ * @return {Observable} An Observable that emits the results of invoking the selector
+ * on the items emitted by a `ConnectableObservable` that shares a single subscription to
+ * the underlying stream.
+ * @method multicast
+ * @owner Observable
+ */
+export function multicast(subjectOrSubjectFactory, selector) {
+    return function multicastOperatorFunction(source) {
+        let subjectFactory;
+        if (typeof subjectOrSubjectFactory === 'function') {
+            subjectFactory = subjectOrSubjectFactory;
+        }
+        else {
+            subjectFactory = function subjectFactory() {
+                return subjectOrSubjectFactory;
+            };
+        }
+        if (typeof selector === 'function') {
+            return source.lift(new MulticastOperator(subjectFactory, selector));
+        }
+        const connectable = Object.create(source, connectableObservableDescriptor);
+        connectable.source = source;
+        connectable.subjectFactory = subjectFactory;
+        return connectable;
+    };
+}
+export class MulticastOperator {
+    constructor(subjectFactory, selector) {
+        this.subjectFactory = subjectFactory;
+        this.selector = selector;
+    }
+    call(subscriber, source) {
+        const { selector } = this;
+        const subject = this.subjectFactory();
+        const subscription = selector(subject).subscribe(subscriber);
+        subscription.add(source.subscribe(subject));
+        return subscription;
+    }
+}
+//# sourceMappingURL=multicast.js.map