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node_modules/rxjs/_esm2015/observable/ConnectableObservable.js

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+import { SubjectSubscriber } from '../Subject';
+import { Observable } from '../Observable';
+import { Subscriber } from '../Subscriber';
+import { Subscription } from '../Subscription';
+import { refCount as higherOrderRefCount } from '../operators/refCount';
+/**
+ * @class ConnectableObservable<T>
+ */
+export class ConnectableObservable extends Observable {
+    constructor(/** @deprecated internal use only */ source, 
+        /** @deprecated internal use only */ subjectFactory) {
+        super();
+        this.source = source;
+        this.subjectFactory = subjectFactory;
+        /** @deprecated internal use only */ this._refCount = 0;
+        this._isComplete = false;
+    }
+    /** @deprecated internal use only */ _subscribe(subscriber) {
+        return this.getSubject().subscribe(subscriber);
+    }
+    /** @deprecated internal use only */ getSubject() {
+        const subject = this._subject;
+        if (!subject || subject.isStopped) {
+            this._subject = this.subjectFactory();
+        }
+        return this._subject;
+    }
+    connect() {
+        let connection = this._connection;
+        if (!connection) {
+            this._isComplete = false;
+            connection = this._connection = new Subscription();
+            connection.add(this.source
+                .subscribe(new ConnectableSubscriber(this.getSubject(), this)));
+            if (connection.closed) {
+                this._connection = null;
+                connection = Subscription.EMPTY;
+            }
+            else {
+                this._connection = connection;
+            }
+        }
+        return connection;
+    }
+    refCount() {
+        return higherOrderRefCount()(this);
+    }
+}
+const connectableProto = ConnectableObservable.prototype;
+export const connectableObservableDescriptor = {
+    operator: { value: null },
+    _refCount: { value: 0, writable: true },
+    _subject: { value: null, writable: true },
+    _connection: { value: null, writable: true },
+    _subscribe: { value: connectableProto._subscribe },
+    _isComplete: { value: connectableProto._isComplete, writable: true },
+    getSubject: { value: connectableProto.getSubject },
+    connect: { value: connectableProto.connect },
+    refCount: { value: connectableProto.refCount }
+};
+class ConnectableSubscriber extends SubjectSubscriber {
+    constructor(destination, connectable) {
+        super(destination);
+        this.connectable = connectable;
+    }
+    _error(err) {
+        this._unsubscribe();
+        super._error(err);
+    }
+    _complete() {
+        this.connectable._isComplete = true;
+        this._unsubscribe();
+        super._complete();
+    }
+    /** @deprecated internal use only */ _unsubscribe() {
+        const connectable = this.connectable;
+        if (connectable) {
+            this.connectable = null;
+            const connection = connectable._connection;
+            connectable._refCount = 0;
+            connectable._subject = null;
+            connectable._connection = null;
+            if (connection) {
+                connection.unsubscribe();
+            }
+        }
+    }
+}
+class RefCountOperator {
+    constructor(connectable) {
+        this.connectable = connectable;
+    }
+    call(subscriber, source) {
+        const { connectable } = this;
+        connectable._refCount++;
+        const refCounter = new RefCountSubscriber(subscriber, connectable);
+        const subscription = source.subscribe(refCounter);
+        if (!refCounter.closed) {
+            refCounter.connection = connectable.connect();
+        }
+        return subscription;
+    }
+}
+class RefCountSubscriber extends Subscriber {
+    constructor(destination, connectable) {
+        super(destination);
+        this.connectable = connectable;
+    }
+    /** @deprecated internal use only */ _unsubscribe() {
+        const { connectable } = this;
+        if (!connectable) {
+            this.connection = null;
+            return;
+        }
+        this.connectable = null;
+        const refCount = connectable._refCount;
+        if (refCount <= 0) {
+            this.connection = null;
+            return;
+        }
+        connectable._refCount = refCount - 1;
+        if (refCount > 1) {
+            this.connection = null;
+            return;
+        }
+        ///
+        // Compare the local RefCountSubscriber's connection Subscription to the
+        // connection Subscription on the shared ConnectableObservable. In cases
+        // where the ConnectableObservable source synchronously emits values, and
+        // the RefCountSubscriber's downstream Observers synchronously unsubscribe,
+        // execution continues to here before the RefCountOperator has a chance to
+        // supply the RefCountSubscriber with the shared connection Subscription.
+        // For example:
+        // ```
+        // Observable.range(0, 10)
+        //   .publish()
+        //   .refCount()
+        //   .take(5)
+        //   .subscribe();
+        // ```
+        // In order to account for this case, RefCountSubscriber should only dispose
+        // the ConnectableObservable's shared connection Subscription if the
+        // connection Subscription exists, *and* either:
+        //   a. RefCountSubscriber doesn't have a reference to the shared connection
+        //      Subscription yet, or,
+        //   b. RefCountSubscriber's connection Subscription reference is identical
+        //      to the shared connection Subscription
+        ///
+        const { connection } = this;
+        const sharedConnection = connectable._connection;
+        this.connection = null;
+        if (sharedConnection && (!connection || sharedConnection === connection)) {
+            sharedConnection.unsubscribe();
+        }
+    }
+}
+//# sourceMappingURL=ConnectableObservable.js.map