129 lines
No EOL
4.1 KiB
JavaScript
129 lines
No EOL
4.1 KiB
JavaScript
import { SubjectSubscriber } from '../Subject';
|
|
import { Observable } from '../Observable';
|
|
import { Subscriber } from '../Subscriber';
|
|
import { Subscription } from '../Subscription';
|
|
import { refCount as higherOrderRefCount } from '../operators/refCount';
|
|
export class ConnectableObservable extends Observable {
|
|
constructor(source, subjectFactory) {
|
|
super();
|
|
this.source = source;
|
|
this.subjectFactory = subjectFactory;
|
|
this._refCount = 0;
|
|
this._isComplete = false;
|
|
}
|
|
_subscribe(subscriber) {
|
|
return this.getSubject().subscribe(subscriber);
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
return connection;
|
|
}
|
|
refCount() {
|
|
return higherOrderRefCount()(this);
|
|
}
|
|
}
|
|
export const connectableObservableDescriptor = (() => {
|
|
const connectableProto = ConnectableObservable.prototype;
|
|
return {
|
|
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();
|
|
}
|
|
_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;
|
|
}
|
|
_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;
|
|
}
|
|
const { connection } = this;
|
|
const sharedConnection = connectable._connection;
|
|
this.connection = null;
|
|
if (sharedConnection && (!connection || sharedConnection === connection)) {
|
|
sharedConnection.unsubscribe();
|
|
}
|
|
}
|
|
}
|
|
//# sourceMappingURL=ConnectableObservable.js.map
|