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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @constructor
* @class FunctionSequence to invoke steps in sequence
*
* @param steps array of functions to invoke in sequence
* @param callback callback to invoke on success
* @param failureCallback callback to invoke on failure
*/
function FunctionSequence(steps, callback, failureCallback, logger) {
// Private variables hidden in closure
var _currentStepIdx = -1;
var _self = this;
var _failed = false;
this.onError = function(err) {
logger.vlog('Failed step: ' + steps[_currentStepIdx].name + ': ' + err);
if (!_failed) {
_failed = true;
failureCallback.apply(this, err, steps[_currentStepIdx].name);
}
};
this.finish = function() {
if (!_failed) {
_currentStepIdx = steps.length;
callback();
}
};
this.nextStep = function(var_args) {
logger.vlog('Starting new step');
if (_failed) {
return;
}
_currentStepIdx++;
if (_currentStepIdx >= steps.length) {
callback.apply(_self, arguments);
return;
}
var currentStep = steps[_currentStepIdx];
logger.vlog('Current step type is' + (typeof currentStep));
if (typeof currentStep == 'function') {
logger.vlog('nextstep : ' + currentStep.name);
currentStep.apply(_self, arguments);
} else {
logger.vlog('nextsep forking ' + currentStep.length + ' chains');
var remaining = currentStep.length;
function resume() {
if (--remaining == 0) {
logger.vlog('barrier passed');
_self.nextStep();
} else {
logger.vlog('waiting for [' + remaining + '] at barrier');
}
}
for (var i = 0; i < currentStep.length; i++) {
var sequence = new FunctionSequence(currentStep[i], resume,
_self.onError, logger);
sequence.start.apply(sequence, arguments);
}
}
};
this.start = this.nextStep;
}
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