87 lines
3.4 KiB
JavaScript
87 lines
3.4 KiB
JavaScript
/** PURE_IMPORTS_START .._Subscriber 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 { Subscriber } from '../Subscriber';
|
|
export function refCount() {
|
|
return function refCountOperatorFunction(source) {
|
|
return source.lift(new RefCountOperator(source));
|
|
};
|
|
}
|
|
var RefCountOperator = /*@__PURE__*/ (/*@__PURE__*/ function () {
|
|
function RefCountOperator(connectable) {
|
|
this.connectable = connectable;
|
|
}
|
|
RefCountOperator.prototype.call = function (subscriber, source) {
|
|
var connectable = this.connectable;
|
|
connectable._refCount++;
|
|
var refCounter = new RefCountSubscriber(subscriber, connectable);
|
|
var subscription = source.subscribe(refCounter);
|
|
if (!refCounter.closed) {
|
|
refCounter.connection = connectable.connect();
|
|
}
|
|
return subscription;
|
|
};
|
|
return RefCountOperator;
|
|
}());
|
|
var RefCountSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
|
|
__extends(RefCountSubscriber, _super);
|
|
function RefCountSubscriber(destination, connectable) {
|
|
_super.call(this, destination);
|
|
this.connectable = connectable;
|
|
}
|
|
/** @deprecated internal use only */ RefCountSubscriber.prototype._unsubscribe = function () {
|
|
var connectable = this.connectable;
|
|
if (!connectable) {
|
|
this.connection = null;
|
|
return;
|
|
}
|
|
this.connectable = null;
|
|
var 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
|
|
///
|
|
var connection = this.connection;
|
|
var sharedConnection = connectable._connection;
|
|
this.connection = null;
|
|
if (sharedConnection && (!connection || sharedConnection === connection)) {
|
|
sharedConnection.unsubscribe();
|
|
}
|
|
};
|
|
return RefCountSubscriber;
|
|
}(Subscriber));
|
|
//# sourceMappingURL=refCount.js.map
|