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