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<html lang="en"> |
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<meta charset="utf-8"> |
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<title>Example: Subclassing Y.Promise</title> |
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<!-- |
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<a href="https://github.com/yui/yui3"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub"></a> |
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<a href="#toc" class="jump">Jump to Table of Contents</a> |
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<h1>Example: Subclassing Y.Promise</h1> |
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<div class="yui3-g"> |
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<div class="yui3-u-3-4"> |
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<div id="main"> |
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<div class="content"><style scoped> |
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background: #ffc5c4; |
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} |
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</style> |
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<div class="intro"> |
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<p> |
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This example expands on the <a href="basic-example.html">Wrapping async transactions with promises</a> example to illustrate how to create your own Promise subclass for performing operations on arrays. |
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</p> |
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</div> |
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<div class="example yui3-skin-sam"> |
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<div id="demo"></div> |
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<script> |
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YUI().use('promise', 'jsonp', 'node', 'array-extras', function (Y) { |
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function ArrayPromise() { |
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ArrayPromise.superclass.constructor.apply(this, arguments); |
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} |
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Y.extend(ArrayPromise, Y.Promise); |
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// Although Y.Array.each does not return an array, for the purpose of this |
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// example we make it chainable by returning the same array |
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ArrayPromise.prototype.each = function (fn, thisObj) { |
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return this.then(function (array) { |
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Y.Array.each(array, fn, thisObj); |
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return array; |
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}); |
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}; |
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// Y.Array.map returns a new array, so we return the result of this.then() |
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ArrayPromise.prototype.map = function (fn, thisObj) { |
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return this.then(function (array) { |
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// By returning the result of Y.Array.map we are returning a new promise |
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// representing the new array |
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return Y.Array.map(array, fn, thisObj); |
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}); |
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}; |
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// Y.Array.filter follows the same pattern as Y.Array.map |
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ArrayPromise.prototype.filter = function (fn, thisObj) { |
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return this.then(function (array) { |
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return Y.Array.filter(array, fn, thisObj); |
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}); |
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}; |
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// Takes any promise and returns an ArrayPromise |
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function toArrayPromise(promise) { |
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return new ArrayPromise(function (fulfill, reject) { |
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promise.then(fulfill, reject); |
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}); |
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} |
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// A cache for GitHub user data |
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var GitHub = (function () { |
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var cache = {}, |
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githubURL = 'https://api.github.com/users/{user}?callback={callback}'; |
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function getUserURL(name) { |
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return Y.Lang.sub(githubURL, { |
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user: name |
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}); |
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} |
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// Fetches a URL, stores a promise in the cache and returns it |
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function fetch(url) { |
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var promise = new Y.Promise(function (fulfill, reject) { |
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Y.jsonp(url, function (res) { |
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var meta = res.meta, |
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data = res.data; |
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// Check for a successful response, otherwise reject the |
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// promise with the message returned by the GitHub API. |
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if (meta.status >= 200 && meta.status < 300) { |
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fulfill(data); |
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} else { |
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reject(new Error(data.message)); |
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} |
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}); |
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// Add a timeout in case the URL is completely wrong |
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// or GitHub is too busy |
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setTimeout(function () { |
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// Once a promise has been fulfilled or rejected it will never |
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// change its state again, so we can safely call reject() after |
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// some time. If it was already fulfilled or rejected, nothing will |
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// happen |
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reject(new Error('Timeout')); |
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}, 10000); |
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}); |
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// store the promise in the cache object |
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cache[url] = promise; |
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return promise; |
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} |
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return { |
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getUser: function (name) { |
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var url = getUserURL(name); |
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if (cache[url]) { |
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// If we have already stored the promise in the cache we just return it |
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return cache[url]; |
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} else { |
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// fetch() will make a JSONP request, cache the promise and return it |
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return fetch(url); |
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} |
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} |
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}; |
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}()); |
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var demoNode = Y.one('#demo'); |
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function log(text) { |
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demoNode.append(Y.Node.create('<div></div>').set('text', text)); |
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} |
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function showError(message) { |
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demoNode.append( |
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Y.Node.create('<div class="error"></div>').set('text', message) |
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); |
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} |
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log('Fetching GitHub data for users: "yui", "yahoo" and "davglass"...') |
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// requests is a regular promise |
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var requests = Y.batch(GitHub.getUser('yui'), GitHub.getUser('yahoo'), GitHub.getUser('davglass')); |
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// users is now an ArrayPromise |
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var users = toArrayPromise(requests); |
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// Transform the data into a list of names |
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users.map(function (data) { |
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log('Getting name for user "' + data.login + '"...') |
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return data.name; |
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}).filter(function (name) { |
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log('Checking if the name "' + name + '" starts with "Y"...') |
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return name.charAt(0) === 'Y'; |
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}).then(function (names) { |
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log('Done!'); |
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return names; |
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}).each(function (name, i) { |
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log(i + '. ' + name); |
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}).then(null, function (error) { |
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// if there was an error in any step or request, it is automatically |
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// passed around the promise chain so we can react to it at the end |
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showError(error.message); |
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}); |
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}); |
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</script> |
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</div> |
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<h2 id="subclassing-ypromise">Subclassing Y.Promise</h2> |
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<p> |
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You can subclass a YUI promise with <a href="../yui/yui-extend.html">Y.extend</a> the same way you would any other class. Keep in mind that Promise constructors take a function as a parameter so you need to call the superclass constructor in order for it to work. |
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</p> |
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<pre class="code prettyprint">function ArrayPromise() { |
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ArrayPromise.superclass.constructor.apply(this, arguments); |
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} |
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Y.extend(ArrayPromise, Y.Promise);</pre> |
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<h2 id="method-chaining">Method Chaining</h2> |
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<p> |
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Chaining promise methods is done by returning the result of calling the promise's <code>then()</code> method. <code>then()</code> <strong>always returns a promise of its same kind</strong>, so this will allow us to chain array operations as if they were real arrays. |
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</p> |
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<p> |
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For the purpose of this example we will only add the <code>each</code>, <code>filter</code> and <code>map</code> methods from the <code>array-extras</code> module. |
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</p> |
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<pre class="code prettyprint">// Although Y.Array.each does not return an array, for the purpose of this |
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// example we make it chainable by returning the same array |
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ArrayPromise.prototype.each = function (fn, thisObj) { |
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return this.then(function (array) { |
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Y.Array.each(array, fn, thisObj); |
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return array; |
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}); |
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}; |
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// Y.Array.map returns a new array, so we return the result of this.then() |
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ArrayPromise.prototype.map = function (fn, thisObj) { |
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return this.then(function (array) { |
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// By returning the result of Y.Array.map we are returning a new promise |
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// representing the new array |
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return Y.Array.map(array, fn, thisObj); |
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}); |
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}; |
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// Y.Array.filter follows the same pattern as Y.Array.map |
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ArrayPromise.prototype.filter = function (fn, thisObj) { |
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return this.then(function (array) { |
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return Y.Array.filter(array, fn, thisObj); |
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}); |
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};</pre> |
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<p> |
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Finally we need a simple way to take a promise that we know contains an array and create an ArrayPromise with its value. |
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</p> |
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<pre class="code prettyprint">// Takes any promise and returns an ArrayPromise |
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function toArrayPromise(promise) { |
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return new ArrayPromise(function (fulfill, reject) { |
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promise.then(fulfill, reject); |
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}); |
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}</pre> |
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<h3 id="putting-our-class-to-action">Putting our Class to Action</h3> |
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<p> |
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There are many cases in which you would want to work on asynchronous array values. Performing more than one async operation at a time and dealing with the result is one common use case. <code>Y.batch</code> waits for many operations and returns a promise representing an array with the result of all the operations, so you could wrap it in an ArrayPromise to modify all those results. |
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</p> |
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<p> |
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We will use the JSONP Cache from <a href="jsonp-cache.html">the previous example</a> and make several simultaneous requests. |
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</p> |
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<pre class="code prettyprint">log('Fetching GitHub data for users: "yui", "yahoo" and "davglass"...') |
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// requests is a regular promise |
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var requests = Y.batch(GitHub.getUser('yui'), GitHub.getUser('yahoo'), GitHub.getUser('davglass')); |
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// users is now an ArrayPromise |
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var users = toArrayPromise(requests); |
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// Transform the data into a list of names |
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users.map(function (data) { |
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log('Getting name for user "' + data.login + '"...') |
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return data.name; |
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}).filter(function (name) { |
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log('Checking if the name "' + name + '" starts with "Y"...') |
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return name.charAt(0) === 'Y'; |
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}).then(function (names) { |
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log('Done!'); |
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return names; |
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}).each(function (name, i) { |
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log(i + '. ' + name); |
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}).then(null, function (error) { |
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// if there was an error in any step or request, it is automatically |
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// passed around the promise chain so we can react to it at the end |
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showError(error.message); |
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});</pre> |
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<h2 id="full-example-code">Full Example Code</h2> |
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<pre class="code prettyprint"><script> |
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YUI().use('promise', 'jsonp', 'node', 'array-extras', function (Y) { |
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function ArrayPromise() { |
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ArrayPromise.superclass.constructor.apply(this, arguments); |
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} |
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Y.extend(ArrayPromise, Y.Promise); |
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// Although Y.Array.each does not return an array, for the purpose of this |
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// example we make it chainable by returning the same array |
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ArrayPromise.prototype.each = function (fn, thisObj) { |
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return this.then(function (array) { |
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Y.Array.each(array, fn, thisObj); |
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return array; |
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}); |
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}; |
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// Y.Array.map returns a new array, so we return the result of this.then() |
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ArrayPromise.prototype.map = function (fn, thisObj) { |
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return this.then(function (array) { |
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// By returning the result of Y.Array.map we are returning a new promise |
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// representing the new array |
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return Y.Array.map(array, fn, thisObj); |
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}); |
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}; |
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// Y.Array.filter follows the same pattern as Y.Array.map |
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ArrayPromise.prototype.filter = function (fn, thisObj) { |
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return this.then(function (array) { |
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return Y.Array.filter(array, fn, thisObj); |
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}); |
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}; |
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// Takes any promise and returns an ArrayPromise |
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function toArrayPromise(promise) { |
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return new ArrayPromise(function (fulfill, reject) { |
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promise.then(fulfill, reject); |
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}); |
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} |
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// A cache for GitHub user data |
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var GitHub = (function () { |
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var cache = {}, |
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githubURL = 'https://api.github.com/users/{user}?callback={callback}'; |
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function getUserURL(name) { |
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return Y.Lang.sub(githubURL, { |
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user: name |
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}); |
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} |
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// Fetches a URL, stores a promise in the cache and returns it |
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function fetch(url) { |
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var promise = new Y.Promise(function (fulfill, reject) { |
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Y.jsonp(url, function (res) { |
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var meta = res.meta, |
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data = res.data; |
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// Check for a successful response, otherwise reject the |
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// promise with the message returned by the GitHub API. |
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if (meta.status >= 200 && meta.status < 300) { |
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fulfill(data); |
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} else { |
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reject(new Error(data.message)); |
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} |
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}); |
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// Add a timeout in case the URL is completely wrong |
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// or GitHub is too busy |
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setTimeout(function () { |
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// Once a promise has been fulfilled or rejected it will never |
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// change its state again, so we can safely call reject() after |
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// some time. If it was already fulfilled or rejected, nothing will |
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// happen |
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reject(new Error('Timeout')); |
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}, 10000); |
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}); |
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364 |
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// store the promise in the cache object |
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cache[url] = promise; |
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return promise; |
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} |
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return { |
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getUser: function (name) { |
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var url = getUserURL(name); |
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if (cache[url]) { |
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// If we have already stored the promise in the cache we just return it |
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return cache[url]; |
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} else { |
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// fetch() will make a JSONP request, cache the promise and return it |
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return fetch(url); |
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} |
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} |
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}; |
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}()); |
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var demoNode = Y.one('#demo'); |
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|
389 |
function log(text) { |
|
|
390 |
demoNode.append(Y.Node.create('<div></div>').set('text', text)); |
|
|
391 |
} |
|
|
392 |
function showError(message) { |
|
|
393 |
demoNode.append( |
|
|
394 |
Y.Node.create('<div class="error"></div>').set('text', message) |
|
|
395 |
); |
|
|
396 |
} |
|
|
397 |
|
|
|
398 |
log('Fetching GitHub data for users: "yui", "yahoo" and "davglass"...') |
|
|
399 |
|
|
|
400 |
// requests is a regular promise |
|
|
401 |
var requests = Y.batch(GitHub.getUser('yui'), GitHub.getUser('yahoo'), GitHub.getUser('davglass')); |
|
|
402 |
// users is now an ArrayPromise |
|
|
403 |
var users = toArrayPromise(requests); |
|
|
404 |
|
|
|
405 |
// Transform the data into a list of names |
|
|
406 |
users.map(function (data) { |
|
|
407 |
log('Getting name for user "' + data.login + '"...') |
|
|
408 |
return data.name; |
|
|
409 |
}).filter(function (name) { |
|
|
410 |
log('Checking if the name "' + name + '" starts with "Y"...') |
|
|
411 |
return name.charAt(0) === 'Y'; |
|
|
412 |
}).then(function (names) { |
|
|
413 |
log('Done!'); |
|
|
414 |
return names; |
|
|
415 |
}).each(function (name, i) { |
|
|
416 |
log(i + '. ' + name); |
|
|
417 |
}).then(null, function (error) { |
|
|
418 |
// if there was an error in any step or request, it is automatically |
|
|
419 |
// passed around the promise chain so we can react to it at the end |
|
|
420 |
showError(error.message); |
|
|
421 |
}); |
|
|
422 |
|
|
|
423 |
}); |
|
|
424 |
</script></pre> |
|
|
425 |
|
|
|
426 |
</div> |
|
|
427 |
</div> |
|
|
428 |
</div> |
|
|
429 |
|
|
|
430 |
<div class="yui3-u-1-4"> |
|
|
431 |
<div class="sidebar"> |
|
|
432 |
|
|
|
433 |
<div id="toc" class="sidebox"> |
|
|
434 |
<div class="hd"> |
|
|
435 |
<h2 class="no-toc">Table of Contents</h2> |
|
|
436 |
</div> |
|
|
437 |
|
|
|
438 |
<div class="bd"> |
|
|
439 |
<ul class="toc"> |
|
|
440 |
<li> |
|
|
441 |
<a href="#subclassing-ypromise">Subclassing Y.Promise</a> |
|
|
442 |
</li> |
|
|
443 |
<li> |
|
|
444 |
<a href="#method-chaining">Method Chaining</a> |
|
|
445 |
<ul class="toc"> |
|
|
446 |
<li> |
|
|
447 |
<a href="#putting-our-class-to-action">Putting our Class to Action</a> |
|
|
448 |
</li> |
|
|
449 |
</ul> |
|
|
450 |
</li> |
|
|
451 |
<li> |
|
|
452 |
<a href="#full-example-code">Full Example Code</a> |
|
|
453 |
</li> |
|
|
454 |
</ul> |
|
|
455 |
</div> |
|
|
456 |
</div> |
|
|
457 |
|
|
|
458 |
|
|
|
459 |
|
|
|
460 |
<div class="sidebox"> |
|
|
461 |
<div class="hd"> |
|
|
462 |
<h2 class="no-toc">Examples</h2> |
|
|
463 |
</div> |
|
|
464 |
|
|
|
465 |
<div class="bd"> |
|
|
466 |
<ul class="examples"> |
|
|
467 |
|
|
|
468 |
|
|
|
469 |
<li data-description="Wrapping async transactions with promises"> |
|
|
470 |
<a href="basic-example.html">Wrapping async transactions with promises</a> |
|
|
471 |
</li> |
|
|
472 |
|
|
|
473 |
|
|
|
474 |
|
|
|
475 |
<li data-description="Extend Y.Promise to create classes that encapsulate standard transaction logic in descriptive method names"> |
|
|
476 |
<a href="subclass-example.html">Subclassing Y.Promise</a> |
|
|
477 |
</li> |
|
|
478 |
|
|
|
479 |
|
|
|
480 |
|
|
|
481 |
<li data-description="Extend the Promise class to create your own Node plugin that chains transitions"> |
|
|
482 |
<a href="plugin-example.html">Creating a Node Plugin that chains transitions</a> |
|
|
483 |
</li> |
|
|
484 |
|
|
|
485 |
|
|
|
486 |
</ul> |
|
|
487 |
</div> |
|
|
488 |
</div> |
|
|
489 |
|
|
|
490 |
|
|
|
491 |
|
|
|
492 |
</div> |
|
|
493 |
</div> |
|
|
494 |
</div> |
|
|
495 |
</div> |
|
|
496 |
|
|
|
497 |
<script src="../assets/vendor/prettify/prettify-min.js"></script> |
|
|
498 |
<script>prettyPrint();</script> |
|
|
499 |
|
|
|
500 |
<script> |
|
|
501 |
YUI.Env.Tests = { |
|
|
502 |
examples: [], |
|
|
503 |
project: '../assets', |
|
|
504 |
assets: '../assets/promise', |
|
|
505 |
name: 'subclass-example', |
|
|
506 |
title: 'Subclassing Y.Promise', |
|
|
507 |
newWindow: '', |
|
|
508 |
auto: false |
|
|
509 |
}; |
|
|
510 |
YUI.Env.Tests.examples.push('basic-example'); |
|
|
511 |
YUI.Env.Tests.examples.push('subclass-example'); |
|
|
512 |
YUI.Env.Tests.examples.push('plugin-example'); |
|
|
513 |
|
|
|
514 |
</script> |
|
|
515 |
<script src="../assets/yui/test-runner.js"></script> |
|
|
516 |
|
|
|
517 |
|
|
|
518 |
|
|
|
519 |
</body> |
|
|
520 |
</html> |