este-library-oldschool/este/labs/app/lastwinurlloader.js

Library for github.com/steida/este.git

// Generated by github.com/steida/coffee2closure 900.1.18
/**
  @fileoverview Algorithm for pending navigation pattern. It maps browser
  behavior, don't show unloaded page and allow user to load another page
  before first page load is resolved.
  @see https://medium.com/joys-of-javascript/4353246f4480
 */
goog.provide('este.labs.app.LastWinUrlLoader');
goog.require('este.labs.app.UrlLoader');
goog.require('goog.async.nextTick');
goog.require('goog.Promise');
goog.require('goog.object');

/**
  @constructor
  @implements {este.labs.app.UrlLoader}
 */
este.labs.app.LastWinUrlLoader = function() {
  this.emptyPendings();
}

/**
  @enum {string}
 */
este.labs.app.LastWinUrlLoader.CancelResolution = {
  ABORT: 'abort',
  PENDING: 'pending',
  TIMEOUT: 'timeout'
};

/**
  @type {number}
 */
este.labs.app.LastWinUrlLoader.prototype.timeoutMs = 15 * 1000;

/**
  @type {?string}
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.lastLoadedUrl = null;

/**
  @type {Object}
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.pendings = null;

/**
  @type {?number}
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.timeoutTimer = null;

/**
  @override
 */
este.labs.app.LastWinUrlLoader.prototype.load = function(url, load) {
  this.lastLoadedUrl = url;
  if (this.pendings[url]) {
    return this.createRejectedWithPendingPromise();
  }
  if (goog.object.isEmpty(this.pendings)) {
    this.timeoutTimer = setTimeout(((function(_this) {
      return function() {
        return _this.onTimeout();
      };
    })(this)), this.timeoutMs);
  }
  return this.pendings[url] = new goog.Promise((function(_this) {
    return function(resolve, reject) {
      load().then(_this.onFulfill.bind(_this, url, resolve, reject), _this.onReject.bind(_this, url, resolve, reject));
    };
  })(this));
};

/**
  @param {string} url
  @param {Function} resolve
  @param {Function} reject
  @param {*} value
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.onFulfill = function(url, resolve, reject, value) {
  var urlIsLastLoaded;
  this.resetPendingsIfUrlWasLastLoaded(url);
  urlIsLastLoaded = url === this.lastLoadedUrl;
  return goog.async.nextTick((function(_this) {
    return function() {
      if (urlIsLastLoaded) {
        return resolve(value);
      } else {
        return reject(_this.createCancellationError(este.labs.app.LastWinUrlLoader.CancelResolution.ABORT));
      }
    };
  })(this));
};

/**
  @param {string} url
  @param {Function} reject
  @param {*} reason
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.onReject = function(url, resolve, reject, reason) {
  var error;
  this.resetPendingsIfUrlWasLastLoaded(url);
  error = new este.labs.app.LastWinUrlLoader.Error(reason);
  error.isSilent = url !== this.lastLoadedUrl;
  return goog.async.nextTick(function() {
    return reject(error);
  });
};

/**
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.createRejectedWithPendingPromise = function() {
  var error;
  error = this.createCancellationError(este.labs.app.LastWinUrlLoader.CancelResolution.PENDING);
  return goog.Promise.reject(error);
};

/**
  @param {string} url
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.resetPendingsIfUrlWasLastLoaded = function(url) {
  if (url !== this.lastLoadedUrl) {
    return;
  }
  return this.resetPendings(url);
};

/**
  @param {?string} url
  @param {string=} resolution
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.resetPendings = function(url, resolution) {
  this.cancelPendingPromises(url, resolution);
  this.emptyPendings();
  return clearTimeout(this.timeoutTimer);
};

/**
  @param {?string} url
  @param {string=} resolution
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.cancelPendingPromises = function(url, resolution) {
  var promise, promiseUrl, ref;
  ref = this.pendings;
  for (promiseUrl in ref) {
    promise = ref[promiseUrl];
    if (promiseUrl === url) {
      continue;
    }
    promise.cancel(resolution != null ? resolution : este.labs.app.LastWinUrlLoader.CancelResolution.ABORT);
  }
};

/**
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.emptyPendings = function() {
  return this.pendings = Object.create(null);
};

/**
  @param {string} resolution
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.createCancellationError = function(resolution) {
  return new goog.Promise.CancellationError(resolution);
};

/**
  @protected
 */
este.labs.app.LastWinUrlLoader.prototype.onTimeout = function() {
  return this.resetPendings(null, este.labs.app.LastWinUrlLoader.CancelResolution.TIMEOUT);
};

/**
  @param {*} reason
  @constructor
  @final
 */
este.labs.app.LastWinUrlLoader.Error = function(reason1) {
  this.reason = reason1;
}

/**
  @type {*}
 */
este.labs.app.LastWinUrlLoader.Error.prototype.reason = null;

/**
  @type {boolean}
 */
este.labs.app.LastWinUrlLoader.Error.prototype.isSilent = false;