using.js
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"use strict";
module.exports = function (Promise, apiRejection, tryConvertToPromise,
createContext) {
var TypeError = require("./errors.js").TypeError;
var inherits = require("./util.js").inherits;
var PromiseInspection = Promise.PromiseInspection;
function inspectionMapper(inspections) {
var len = inspections.length;
for (var i = 0; i < len; ++i) {
var inspection = inspections[i];
if (inspection.isRejected()) {
return Promise.reject(inspection.error());
}
inspections[i] = inspection._settledValue;
}
return inspections;
}
function thrower(e) {
setTimeout(function(){throw e;}, 0);
}
function castPreservingDisposable(thenable) {
var maybePromise = tryConvertToPromise(thenable);
if (maybePromise !== thenable &&
typeof thenable._isDisposable === "function" &&
typeof thenable._getDisposer === "function" &&
thenable._isDisposable()) {
maybePromise._setDisposable(thenable._getDisposer());
}
return maybePromise;
}
function dispose(resources, inspection) {
var i = 0;
var len = resources.length;
var ret = Promise.defer();
function iterator() {
if (i >= len) return ret.resolve();
var maybePromise = castPreservingDisposable(resources[i++]);
if (maybePromise instanceof Promise &&
maybePromise._isDisposable()) {
try {
maybePromise = tryConvertToPromise(
maybePromise._getDisposer().tryDispose(inspection),
resources.promise);
} catch (e) {
return thrower(e);
}
if (maybePromise instanceof Promise) {
return maybePromise._then(iterator, thrower,
null, null, null);
}
}
iterator();
}
iterator();
return ret.promise;
}
function disposerSuccess(value) {
var inspection = new PromiseInspection();
inspection._settledValue = value;
inspection._bitField = 268435456;
return dispose(this, inspection).thenReturn(value);
}
function disposerFail(reason) {
var inspection = new PromiseInspection();
inspection._settledValue = reason;
inspection._bitField = 134217728;
return dispose(this, inspection).thenThrow(reason);
}
function Disposer(data, promise, context) {
this._data = data;
this._promise = promise;
this._context = context;
}
Disposer.prototype.data = function () {
return this._data;
};
Disposer.prototype.promise = function () {
return this._promise;
};
Disposer.prototype.resource = function () {
if (this.promise().isFulfilled()) {
return this.promise().value();
}
return null;
};
Disposer.prototype.tryDispose = function(inspection) {
var resource = this.resource();
var context = this._context;
if (context !== undefined) context._pushContext();
var ret = resource !== null
? this.doDispose(resource, inspection) : null;
if (context !== undefined) context._popContext();
this._promise._unsetDisposable();
this._data = null;
return ret;
};
Disposer.isDisposer = function (d) {
return (d != null &&
typeof d.resource === "function" &&
typeof d.tryDispose === "function");
};
function FunctionDisposer(fn, promise, context) {
this.constructor$(fn, promise, context);
}
inherits(FunctionDisposer, Disposer);
FunctionDisposer.prototype.doDispose = function (resource, inspection) {
var fn = this.data();
return fn.call(resource, resource, inspection);
};
function maybeUnwrapDisposer(value) {
if (Disposer.isDisposer(value)) {
this.resources[this.index]._setDisposable(value);
return value.promise();
}
return value;
}
Promise.using = function () {
var len = arguments.length;
if (len < 2) return apiRejection(
"you must pass at least 2 arguments to Promise.using");
var fn = arguments[len - 1];
if (typeof fn !== "function") return apiRejection("fn must be a function\u000a\u000a See http://goo.gl/916lJJ\u000a");
len--;
var resources = new Array(len);
for (var i = 0; i < len; ++i) {
var resource = arguments[i];
if (Disposer.isDisposer(resource)) {
var disposer = resource;
resource = resource.promise();
resource._setDisposable(disposer);
} else {
var maybePromise = tryConvertToPromise(resource);
if (maybePromise instanceof Promise) {
resource =
maybePromise._then(maybeUnwrapDisposer, null, null, {
resources: resources,
index: i
}, undefined);
}
}
resources[i] = resource;
}
var promise = Promise.settle(resources)
.then(inspectionMapper)
.then(function(vals) {
promise._pushContext();
var ret;
try {
ret = fn.apply(undefined, vals);
} finally {
promise._popContext();
}
return ret;
})
._then(
disposerSuccess, disposerFail, undefined, resources, undefined);
resources.promise = promise;
return promise;
};
Promise.prototype._setDisposable = function (disposer) {
this._bitField = this._bitField | 262144;
this._disposer = disposer;
};
Promise.prototype._isDisposable = function () {
return (this._bitField & 262144) > 0;
};
Promise.prototype._getDisposer = function () {
return this._disposer;
};
Promise.prototype._unsetDisposable = function () {
this._bitField = this._bitField & (~262144);
this._disposer = undefined;
};
Promise.prototype.disposer = function (fn) {
if (typeof fn === "function") {
return new FunctionDisposer(fn, this, createContext());
}
throw new TypeError();
};
};