Subscriber.js

"use strict";
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 __());
};
var isFunction_1 = require('./util/isFunction');
var Subscription_1 = require('./Subscription');
var Observer_1 = require('./Observer');
var rxSubscriber_1 = require('./symbol/rxSubscriber');
/**
 * Implements the {@link Observer} interface and extends the
 * {@link Subscription} class. While the {@link Observer} is the public API for
 * consuming the values of an {@link Observable}, all Observers get converted to
 * a Subscriber, in order to provide Subscription-like capabilities such as
 * `unsubscribe`. Subscriber is a common type in RxJS, and crucial for
 * implementing operators, but it is rarely used as a public API.
 *
 * @class Subscriber<T>
 */
var Subscriber = (function (_super) {
    __extends(Subscriber, _super);
    /**
     * @param {Observer|function(value: T): void} [destinationOrNext] A partially
     * defined Observer or a `next` callback function.
     * @param {function(e: ?any): void} [error] The `error` callback of an
     * Observer.
     * @param {function(): void} [complete] The `complete` callback of an
     * Observer.
     */
    function Subscriber(destinationOrNext, error, complete) {
        _super.call(this);
        this.syncErrorValue = null;
        this.syncErrorThrown = false;
        this.syncErrorThrowable = false;
        this.isStopped = false;
        switch (arguments.length) {
            case 0:
                this.destination = Observer_1.empty;
                break;
            case 1:
                if (!destinationOrNext) {
                    this.destination = Observer_1.empty;
                    break;
                }
                if (typeof destinationOrNext === 'object') {
                    if (destinationOrNext instanceof Subscriber) {
                        this.syncErrorThrowable = destinationOrNext.syncErrorThrowable;
                        this.destination = destinationOrNext;
                        this.destination.add(this);
                    }
                    else {
                        this.syncErrorThrowable = true;
                        this.destination = new SafeSubscriber(this, destinationOrNext);
                    }
                    break;
                }
            default:
                this.syncErrorThrowable = true;
                this.destination = new SafeSubscriber(this, destinationOrNext, error, complete);
                break;
        }
    }
    Subscriber.prototype[rxSubscriber_1.rxSubscriber] = function () { return this; };
    /**
     * A static factory for a Subscriber, given a (potentially partial) definition
     * of an Observer.
     * @param {function(x: ?T): void} [next] The `next` callback of an Observer.
     * @param {function(e: ?any): void} [error] The `error` callback of an
     * Observer.
     * @param {function(): void} [complete] The `complete` callback of an
     * Observer.
     * @return {Subscriber<T>} A Subscriber wrapping the (partially defined)
     * Observer represented by the given arguments.
     */
    Subscriber.create = function (next, error, complete) {
        var subscriber = new Subscriber(next, error, complete);
        subscriber.syncErrorThrowable = false;
        return subscriber;
    };
    /**
     * The {@link Observer} callback to receive notifications of type `next` from
     * the Observable, with a value. The Observable may call this method 0 or more
     * times.
     * @param {T} [value] The `next` value.
     * @return {void}
     */
    Subscriber.prototype.next = function (value) {
        if (!this.isStopped) {
            this._next(value);
        }
    };
    /**
     * The {@link Observer} callback to receive notifications of type `error` from
     * the Observable, with an attached {@link Error}. Notifies the Observer that
     * the Observable has experienced an error condition.
     * @param {any} [err] The `error` exception.
     * @return {void}
     */
    Subscriber.prototype.error = function (err) {
        if (!this.isStopped) {
            this.isStopped = true;
            this._error(err);
        }
    };
    /**
     * The {@link Observer} callback to receive a valueless notification of type
     * `complete` from the Observable. Notifies the Observer that the Observable
     * has finished sending push-based notifications.
     * @return {void}
     */
    Subscriber.prototype.complete = function () {
        if (!this.isStopped) {
            this.isStopped = true;
            this._complete();
        }
    };
    Subscriber.prototype.unsubscribe = function () {
        if (this.closed) {
            return;
        }
        this.isStopped = true;
        _super.prototype.unsubscribe.call(this);
    };
    Subscriber.prototype._next = function (value) {
        this.destination.next(value);
    };
    Subscriber.prototype._error = function (err) {
        this.destination.error(err);
        this.unsubscribe();
    };
    Subscriber.prototype._complete = function () {
        this.destination.complete();
        this.unsubscribe();
    };
    Subscriber.prototype._unsubscribeAndRecycle = function () {
        var _a = this, _parent = _a._parent, _parents = _a._parents;
        this._parent = null;
        this._parents = null;
        this.unsubscribe();
        this.closed = false;
        this.isStopped = false;
        this._parent = _parent;
        this._parents = _parents;
        return this;
    };
    return Subscriber;
}(Subscription_1.Subscription));
exports.Subscriber = Subscriber;
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SafeSubscriber = (function (_super) {
    __extends(SafeSubscriber, _super);
    function SafeSubscriber(_parentSubscriber, observerOrNext, error, complete) {
        _super.call(this);
        this._parentSubscriber = _parentSubscriber;
        var next;
        var context = this;
        if (isFunction_1.isFunction(observerOrNext)) {
            next = observerOrNext;
        }
        else if (observerOrNext) {
            next = observerOrNext.next;
            error = observerOrNext.error;
            complete = observerOrNext.complete;
            if (observerOrNext !== Observer_1.empty) {
                context = Object.create(observerOrNext);
                if (isFunction_1.isFunction(context.unsubscribe)) {
                    this.add(context.unsubscribe.bind(context));
                }
                context.unsubscribe = this.unsubscribe.bind(this);
            }
        }
        this._context = context;
        this._next = next;
        this._error = error;
        this._complete = complete;
    }
    SafeSubscriber.prototype.next = function (value) {
        if (!this.isStopped && this._next) {
            var _parentSubscriber = this._parentSubscriber;
            if (!_parentSubscriber.syncErrorThrowable) {
                this.__tryOrUnsub(this._next, value);
            }
            else if (this.__tryOrSetError(_parentSubscriber, this._next, value)) {
                this.unsubscribe();
            }
        }
    };
    SafeSubscriber.prototype.error = function (err) {
        if (!this.isStopped) {
            var _parentSubscriber = this._parentSubscriber;
            if (this._error) {
                if (!_parentSubscriber.syncErrorThrowable) {
                    this.__tryOrUnsub(this._error, err);
                    this.unsubscribe();
                }
                else {
                    this.__tryOrSetError(_parentSubscriber, this._error, err);
                    this.unsubscribe();
                }
            }
            else if (!_parentSubscriber.syncErrorThrowable) {
                this.unsubscribe();
                throw err;
            }
            else {
                _parentSubscriber.syncErrorValue = err;
                _parentSubscriber.syncErrorThrown = true;
                this.unsubscribe();
            }
        }
    };
    SafeSubscriber.prototype.complete = function () {
        var _this = this;
        if (!this.isStopped) {
            var _parentSubscriber = this._parentSubscriber;
            if (this._complete) {
                var wrappedComplete = function () { return _this._complete.call(_this._context); };
                if (!_parentSubscriber.syncErrorThrowable) {
                    this.__tryOrUnsub(wrappedComplete);
                    this.unsubscribe();
                }
                else {
                    this.__tryOrSetError(_parentSubscriber, wrappedComplete);
                    this.unsubscribe();
                }
            }
            else {
                this.unsubscribe();
            }
        }
    };
    SafeSubscriber.prototype.__tryOrUnsub = function (fn, value) {
        try {
            fn.call(this._context, value);
        }
        catch (err) {
            this.unsubscribe();
            throw err;
        }
    };
    SafeSubscriber.prototype.__tryOrSetError = function (parent, fn, value) {
        try {
            fn.call(this._context, value);
        }
        catch (err) {
            parent.syncErrorValue = err;
            parent.syncErrorThrown = true;
            return true;
        }
        return false;
    };
    SafeSubscriber.prototype._unsubscribe = function () {
        var _parentSubscriber = this._parentSubscriber;
        this._context = null;
        this._parentSubscriber = null;
        _parentSubscriber.unsubscribe();
    };
    return SafeSubscriber;
}(Subscriber));
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