227 lines
7.3 KiB
JavaScript
227 lines
7.3 KiB
JavaScript
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"use strict";
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module.exports = function (Promise, apiRejection, tryConvertToPromise,
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createContext, INTERNAL, debug) {
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var util = require("./util");
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var TypeError = require("./errors").TypeError;
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var inherits = require("./util").inherits;
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var errorObj = util.errorObj;
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var tryCatch = util.tryCatch;
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var NULL = {};
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function thrower(e) {
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setTimeout(function(){throw e;}, 0);
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}
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function castPreservingDisposable(thenable) {
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var maybePromise = tryConvertToPromise(thenable);
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if (maybePromise !== thenable &&
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typeof thenable._isDisposable === "function" &&
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typeof thenable._getDisposer === "function" &&
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thenable._isDisposable()) {
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maybePromise._setDisposable(thenable._getDisposer());
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}
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return maybePromise;
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}
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function dispose(resources, inspection) {
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var i = 0;
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var len = resources.length;
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var ret = new Promise(INTERNAL);
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function iterator() {
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if (i >= len) return ret._fulfill();
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var maybePromise = castPreservingDisposable(resources[i++]);
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if (maybePromise instanceof Promise &&
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maybePromise._isDisposable()) {
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try {
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maybePromise = tryConvertToPromise(
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maybePromise._getDisposer().tryDispose(inspection),
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resources.promise);
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} catch (e) {
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return thrower(e);
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}
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if (maybePromise instanceof Promise) {
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return maybePromise._then(iterator, thrower,
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null, null, null);
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}
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}
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iterator();
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}
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iterator();
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return ret;
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}
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function Disposer(data, promise, context) {
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this._data = data;
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this._promise = promise;
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this._context = context;
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}
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Disposer.prototype.data = function () {
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return this._data;
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};
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Disposer.prototype.promise = function () {
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return this._promise;
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};
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Disposer.prototype.resource = function () {
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if (this.promise().isFulfilled()) {
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return this.promise().value();
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}
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return NULL;
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};
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Disposer.prototype.tryDispose = function(inspection) {
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var resource = this.resource();
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var context = this._context;
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if (context !== undefined) context._pushContext();
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var ret = resource !== NULL
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? this.doDispose(resource, inspection) : null;
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if (context !== undefined) context._popContext();
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this._promise._unsetDisposable();
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this._data = null;
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return ret;
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};
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Disposer.isDisposer = function (d) {
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return (d != null &&
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typeof d.resource === "function" &&
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typeof d.tryDispose === "function");
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};
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function FunctionDisposer(fn, promise, context) {
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this.constructor$(fn, promise, context);
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}
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inherits(FunctionDisposer, Disposer);
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FunctionDisposer.prototype.doDispose = function (resource, inspection) {
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var fn = this.data();
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return fn.call(resource, resource, inspection);
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};
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function maybeUnwrapDisposer(value) {
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if (Disposer.isDisposer(value)) {
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this.resources[this.index]._setDisposable(value);
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return value.promise();
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}
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return value;
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}
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function ResourceList(length) {
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this.length = length;
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this.promise = null;
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this[length-1] = null;
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}
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ResourceList.prototype._resultCancelled = function() {
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var len = this.length;
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for (var i = 0; i < len; ++i) {
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var item = this[i];
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if (item instanceof Promise) {
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item.cancel();
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}
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}
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};
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Promise.using = function () {
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var len = arguments.length;
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if (len < 2) return apiRejection(
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"you must pass at least 2 arguments to Promise.using");
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var fn = arguments[len - 1];
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if (typeof fn !== "function") {
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return apiRejection("expecting a function but got " + util.classString(fn));
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}
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var input;
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var spreadArgs = true;
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if (len === 2 && Array.isArray(arguments[0])) {
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input = arguments[0];
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len = input.length;
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spreadArgs = false;
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} else {
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input = arguments;
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len--;
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}
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var resources = new ResourceList(len);
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for (var i = 0; i < len; ++i) {
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var resource = input[i];
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if (Disposer.isDisposer(resource)) {
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var disposer = resource;
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resource = resource.promise();
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resource._setDisposable(disposer);
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} else {
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var maybePromise = tryConvertToPromise(resource);
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if (maybePromise instanceof Promise) {
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resource =
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maybePromise._then(maybeUnwrapDisposer, null, null, {
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resources: resources,
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index: i
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}, undefined);
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}
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}
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resources[i] = resource;
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}
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var reflectedResources = new Array(resources.length);
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for (var i = 0; i < reflectedResources.length; ++i) {
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reflectedResources[i] = Promise.resolve(resources[i]).reflect();
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}
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var resultPromise = Promise.all(reflectedResources)
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.then(function(inspections) {
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for (var i = 0; i < inspections.length; ++i) {
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var inspection = inspections[i];
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if (inspection.isRejected()) {
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errorObj.e = inspection.error();
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return errorObj;
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} else if (!inspection.isFulfilled()) {
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resultPromise.cancel();
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return;
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}
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inspections[i] = inspection.value();
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}
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promise._pushContext();
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fn = tryCatch(fn);
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var ret = spreadArgs
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? fn.apply(undefined, inspections) : fn(inspections);
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var promiseCreated = promise._popContext();
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debug.checkForgottenReturns(
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ret, promiseCreated, "Promise.using", promise);
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return ret;
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});
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var promise = resultPromise.lastly(function() {
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var inspection = new Promise.PromiseInspection(resultPromise);
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return dispose(resources, inspection);
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});
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resources.promise = promise;
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promise._setOnCancel(resources);
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return promise;
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};
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Promise.prototype._setDisposable = function (disposer) {
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this._bitField = this._bitField | 131072;
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this._disposer = disposer;
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};
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Promise.prototype._isDisposable = function () {
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return (this._bitField & 131072) > 0;
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};
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Promise.prototype._getDisposer = function () {
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return this._disposer;
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};
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Promise.prototype._unsetDisposable = function () {
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this._bitField = this._bitField & (~131072);
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this._disposer = undefined;
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};
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Promise.prototype.disposer = function (fn) {
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if (typeof fn === "function") {
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return new FunctionDisposer(fn, this, createContext());
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}
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throw new TypeError();
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};
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};
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