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data-ice="title">es6/observable/BoundNodeCallbackObservable.js</h1> <pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { Observable } from '../Observable'; import { tryCatch } from '../util/tryCatch'; import { errorObject } from '../util/errorObject'; import { AsyncSubject } from '../AsyncSubject'; /** * We need this JSDoc comment for affecting ESDoc. * @extends {Ignored} * @hide true */ export var BoundNodeCallbackObservable = (function (_super) { __extends(BoundNodeCallbackObservable, _super); function BoundNodeCallbackObservable(callbackFunc, selector, args, scheduler) { _super.call(this); this.callbackFunc = callbackFunc; this.selector = selector; this.args = args; this.scheduler = scheduler; } /* tslint:enable:max-line-length */ /** * Converts a Node.js-style callback API to a function that returns an * Observable. * * <span class="informal">It's just like {@link bindCallback}, but the * callback is expected to be of type `callback(error, result)`.</span> * * `bindNodeCallback` is not an operator because its input and output are not * Observables. The input is a function `func` with some parameters, but the * last parameter must be a callback function that `func` calls when it is * done. The callback function is expected to follow Node.js conventions, * where the first argument to the callback is an error, while remaining * arguments are the callback result. The output of `bindNodeCallback` is a * function that takes the same parameters as `func`, except the last one (the * callback). When the output function is called with arguments, it will * return an Observable where the results will be delivered to. * * @example <caption>Read a file from the filesystem and get the data as an Observable</caption> * import * as fs from 'fs'; * var readFileAsObservable = Rx.Observable.bindNodeCallback(fs.readFile); * var result = readFileAsObservable('./roadNames.txt', 'utf8'); * result.subscribe(x => console.log(x), e => console.error(e)); * * @see {@link bindCallback} * @see {@link from} * @see {@link fromPromise} * * @param {function} func Function with a callback as the last parameter. * @param {function} [selector] A function which takes the arguments from the * callback and maps those a value to emit on the output Observable. * @param {Scheduler} [scheduler] The scheduler on which to schedule the * callbacks. * @return {function(...params: *): Observable} A function which returns the * Observable that delivers the same values the Node.js callback would * deliver. * @static true * @name bindNodeCallback * @owner Observable */ BoundNodeCallbackObservable.create = function (func, selector, scheduler) { if (selector === void 0) { selector = undefined; } return function () { var args = []; for (var _i = 0; _i < arguments.length; _i++) { args[_i - 0] = arguments[_i]; } return new BoundNodeCallbackObservable(func, selector, args, scheduler); }; }; BoundNodeCallbackObservable.prototype._subscribe = function (subscriber) { var callbackFunc = this.callbackFunc; var args = this.args; var scheduler = this.scheduler; var subject = this.subject; if (!scheduler) { if (!subject) { subject = this.subject = new AsyncSubject(); var handler = function handlerFn() { var innerArgs = []; for (var _i = 0; _i < arguments.length; _i++) { innerArgs[_i - 0] = arguments[_i]; } var source = handlerFn.source; var selector = source.selector, subject = source.subject; var err = innerArgs.shift(); if (err) { subject.error(err); } else if (selector) { var result_1 = tryCatch(selector).apply(this, innerArgs); if (result_1 === errorObject) { subject.error(errorObject.e); } else { subject.next(result_1); subject.complete(); } } else { subject.next(innerArgs.length === 1 ? innerArgs[0] : innerArgs); subject.complete(); } }; // use named function instance to avoid closure. handler.source = this; var result = tryCatch(callbackFunc).apply(this, args.concat(handler)); if (result === errorObject) { subject.error(errorObject.e); } } return subject.subscribe(subscriber); } else { return scheduler.schedule(dispatch, 0, { source: this, subscriber: subscriber }); } }; return BoundNodeCallbackObservable; }(Observable)); function dispatch(state) { var self = this; var source = state.source, subscriber = state.subscriber; // XXX: cast to `any` to access to the private field in `source`. var _a = source, callbackFunc = _a.callbackFunc, args = _a.args, scheduler = _a.scheduler; var subject = source.subject; if (!subject) { subject = source.subject = new AsyncSubject(); var handler = function handlerFn() { var innerArgs = []; for (var _i = 0; _i < arguments.length; _i++) { innerArgs[_i - 0] = arguments[_i]; } var source = handlerFn.source; var selector = source.selector, subject = source.subject; var err = innerArgs.shift(); if (err) { subject.error(err); } else if (selector) { var result_2 = tryCatch(selector).apply(this, innerArgs); if (result_2 === errorObject) { self.add(scheduler.schedule(dispatchError, 0, { err: errorObject.e, subject: subject })); } else { self.add(scheduler.schedule(dispatchNext, 0, { value: result_2, subject: subject })); } } else { var value = innerArgs.length === 1 ? innerArgs[0] : innerArgs; self.add(scheduler.schedule(dispatchNext, 0, { value: value, subject: subject })); } }; // use named function to pass values in without closure handler.source = source; var result = tryCatch(callbackFunc).apply(this, args.concat(handler)); if (result === errorObject) { subject.error(errorObject.e); } } self.add(subject.subscribe(subscriber)); } function dispatchNext(arg) { var value = arg.value, subject = arg.subject; subject.next(value); subject.complete(); } function dispatchError(arg) { var err = arg.err, subject = arg.subject; subject.error(err); } //# sourceMappingURL=BoundNodeCallbackObservable.js.map</code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.8)</span></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>