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import { isArray } from './util/isArray';
import { isObject } from './util/isObject';
import { isFunction } from './util/isFunction';
import { UnsubscriptionError } from './util/UnsubscriptionError';
import { SubscriptionLike, TeardownLogic } from './types';
/**
* Represents a disposable resource, such as the execution of an Observable. A
* Subscription has one important method, `unsubscribe`, that takes no argument
* and just disposes the resource held by the subscription.
*
* Additionally, subscriptions may be grouped together through the `add()`
* method, which will attach a child Subscription to the current Subscription.
* When a Subscription is unsubscribed, all its children (and its grandchildren)
* will be unsubscribed as well.
*
* @class Subscription
*/
export class Subscription implements SubscriptionLike {
/** @nocollapse */
public static EMPTY: Subscription = (function(empty: any) {
empty.closed = true;
return empty;
}(new Subscription()));
/**
* A flag to indicate whether this Subscription has already been unsubscribed.
* @type {boolean}
*/
public closed: boolean = false;
/** @internal */
protected _parentOrParents: Subscription | Subscription[] = null;
/** @internal */
private _subscriptions: SubscriptionLike[] = null;
/**
* @param {function(): void} [unsubscribe] A function describing how to
* perform the disposal of resources when the `unsubscribe` method is called.
*/
constructor(unsubscribe?: () => void) {
if (unsubscribe) {
(this as any)._ctorUnsubscribe = true;
(this as any)._unsubscribe = unsubscribe;
}
}
/**
* Disposes the resources held by the subscription. May, for instance, cancel
* an ongoing Observable execution or cancel any other type of work that
* started when the Subscription was created.
* @return {void}
*/
unsubscribe(): void {
let errors: any[];
if (this.closed) {
return;
}
let { _parentOrParents, _ctorUnsubscribe, _unsubscribe, _subscriptions } = (this as any);
this.closed = true;
this._parentOrParents = null;
// null out _subscriptions first so any child subscriptions that attempt
// to remove themselves from this subscription will noop
this._subscriptions = null;
if (_parentOrParents instanceof Subscription) {
_parentOrParents.remove(this);
} else if (_parentOrParents !== null) {
for (let index = 0; index < _parentOrParents.length; ++index) {
const parent = _parentOrParents[index];
parent.remove(this);
}
}
if (isFunction(_unsubscribe)) {
// It's only possible to null _unsubscribe - to release the reference to
// any teardown function passed in the constructor - if the property was
// actually assigned in the constructor, as there are some classes that
// are derived from Subscriber (which derives from Subscription) that
// implement an _unsubscribe method as a mechanism for obtaining
// unsubscription notifications and some of those subscribers are
// recycled. Also, in some of those subscribers, _unsubscribe switches
// from a prototype method to an instance property - see notifyNext in
// RetryWhenSubscriber.
if (_ctorUnsubscribe) {
(this as any)._unsubscribe = undefined;
}
try {
_unsubscribe.call(this);
} catch (e) {
errors = e instanceof UnsubscriptionError ? flattenUnsubscriptionErrors(e.errors) : [e];
}
}
if (isArray(_subscriptions)) {
let index = -1;
let len = _subscriptions.length;
while (++index < len) {
const sub = _subscriptions[index];
if (isObject(sub)) {
try {
sub.unsubscribe();
} catch (e) {
errors = errors || [];
if (e instanceof UnsubscriptionError) {
errors = errors.concat(flattenUnsubscriptionErrors(e.errors));
} else {
errors.push(e);
}
}
}
}
}
if (errors) {
throw new UnsubscriptionError(errors);
}
}
/**
* Adds a tear down to be called during the unsubscribe() of this
* Subscription. Can also be used to add a child subscription.
*
* If the tear down being added is a subscription that is already
* unsubscribed, is the same reference `add` is being called on, or is
* `Subscription.EMPTY`, it will not be added.
*
* If this subscription is already in an `closed` state, the passed
* tear down logic will be executed immediately.
*
* When a parent subscription is unsubscribed, any child subscriptions that were added to it are also unsubscribed.
*
* @param {TeardownLogic} teardown The additional logic to execute on
* teardown.
* @return {Subscription} Returns the Subscription used or created to be
* added to the inner subscriptions list. This Subscription can be used with
* `remove()` to remove the passed teardown logic from the inner subscriptions
* list.
*/
add(teardown: TeardownLogic): Subscription {
let subscription = (<Subscription>teardown);
if (!teardown) {
return Subscription.EMPTY;
}
switch (typeof teardown) {
case 'function':
subscription = new Subscription(<(() => void)>teardown);
case 'object':
if (subscription === this || subscription.closed || typeof subscription.unsubscribe !== 'function') {
// This also covers the case where `subscription` is `Subscription.EMPTY`, which is always in `closed` state.
return subscription;
} else if (this.closed) {
subscription.unsubscribe();
return subscription;
} else if (!(subscription instanceof Subscription)) {
const tmp = subscription;
subscription = new Subscription();
subscription._subscriptions = [tmp];
}
break;
default: {
throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');
}
}
// Add `this` as parent of `subscription` if that's not already the case.
let { _parentOrParents } = subscription;
if (_parentOrParents === null) {
// If we don't have a parent, then set `subscription._parents` to
// the `this`, which is the common case that we optimize for.
subscription._parentOrParents = this;
} else if (_parentOrParents instanceof Subscription) {
if (_parentOrParents === this) {
// The `subscription` already has `this` as a parent.
return subscription;
}
// If there's already one parent, but not multiple, allocate an
// Array to store the rest of the parent Subscriptions.
subscription._parentOrParents = [_parentOrParents, this];
} else if (_parentOrParents.indexOf(this) === -1) {
// Only add `this` to the _parentOrParents list if it's not already there.
_parentOrParents.push(this);
} else {
// The `subscription` already has `this` as a parent.
return subscription;
}
// Optimize for the common case when adding the first subscription.
const subscriptions = this._subscriptions;
if (subscriptions === null) {
this._subscriptions = [subscription];
} else {
subscriptions.push(subscription);
}
return subscription;
}
/**
* Removes a Subscription from the internal list of subscriptions that will
* unsubscribe during the unsubscribe process of this Subscription.
* @param {Subscription} subscription The subscription to remove.
* @return {void}
*/
remove(subscription: Subscription): void {
const subscriptions = this._subscriptions;
if (subscriptions) {
const subscriptionIndex = subscriptions.indexOf(subscription);
if (subscriptionIndex !== -1) {
subscriptions.splice(subscriptionIndex, 1);
}
}
}
}
function flattenUnsubscriptionErrors(errors: any[]) {
return errors.reduce((errs, err) => errs.concat((err instanceof UnsubscriptionError) ? err.errors : err), []);
}