121 lines
2.8 KiB
JavaScript
121 lines
2.8 KiB
JavaScript
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"use strict";
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var firstLineError;
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try {throw new Error(); } catch (e) {firstLineError = e;}
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var schedule = require("./schedule");
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var Queue = require("./queue");
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function Async() {
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this._customScheduler = false;
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this._isTickUsed = false;
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this._lateQueue = new Queue(16);
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this._normalQueue = new Queue(16);
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this._haveDrainedQueues = false;
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var self = this;
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this.drainQueues = function () {
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self._drainQueues();
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};
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this._schedule = schedule;
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}
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Async.prototype.setScheduler = function(fn) {
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var prev = this._schedule;
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this._schedule = fn;
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this._customScheduler = true;
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return prev;
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};
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Async.prototype.hasCustomScheduler = function() {
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return this._customScheduler;
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};
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Async.prototype.haveItemsQueued = function () {
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return this._isTickUsed || this._haveDrainedQueues;
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};
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Async.prototype.fatalError = function(e, isNode) {
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if (isNode) {
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process.stderr.write("Fatal " + (e instanceof Error ? e.stack : e) +
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"\n");
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process.exit(2);
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} else {
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this.throwLater(e);
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}
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};
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Async.prototype.throwLater = function(fn, arg) {
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if (arguments.length === 1) {
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arg = fn;
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fn = function () { throw arg; };
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}
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if (typeof setTimeout !== "undefined") {
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setTimeout(function() {
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fn(arg);
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}, 0);
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} else try {
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this._schedule(function() {
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fn(arg);
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});
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} catch (e) {
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throw new Error("No async scheduler available\u000a\u000a See http://goo.gl/MqrFmX\u000a");
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}
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};
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function AsyncInvokeLater(fn, receiver, arg) {
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this._lateQueue.push(fn, receiver, arg);
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this._queueTick();
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}
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function AsyncInvoke(fn, receiver, arg) {
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this._normalQueue.push(fn, receiver, arg);
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this._queueTick();
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}
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function AsyncSettlePromises(promise) {
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this._normalQueue._pushOne(promise);
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this._queueTick();
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}
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Async.prototype.invokeLater = AsyncInvokeLater;
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Async.prototype.invoke = AsyncInvoke;
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Async.prototype.settlePromises = AsyncSettlePromises;
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function _drainQueue(queue) {
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while (queue.length() > 0) {
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_drainQueueStep(queue);
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}
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}
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function _drainQueueStep(queue) {
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var fn = queue.shift();
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if (typeof fn !== "function") {
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fn._settlePromises();
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} else {
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var receiver = queue.shift();
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var arg = queue.shift();
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fn.call(receiver, arg);
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}
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}
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Async.prototype._drainQueues = function () {
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_drainQueue(this._normalQueue);
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this._reset();
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this._haveDrainedQueues = true;
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_drainQueue(this._lateQueue);
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};
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Async.prototype._queueTick = function () {
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if (!this._isTickUsed) {
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this._isTickUsed = true;
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this._schedule(this.drainQueues);
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}
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};
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Async.prototype._reset = function () {
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this._isTickUsed = false;
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};
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module.exports = Async;
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module.exports.firstLineError = firstLineError;
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