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<!DOCTYPE html>  <html lang="en"> <head> <meta charset="utf-8"> <title>CanJS - can-connect/data/worker/worker</title> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"> <link rel="stylesheet" type="text/css" href="../../../static/bundles/bit-docs-site/static.css"> <link rel="shortcut icon" sizes="16x16 24x24 32x32 48x48 64x64" href="/docs/images/canjs_favicon.ico"> <link rel="apple-touch-icon" sizes="57x57" href="../../../../docs/images/canjs_favicon_57x57.png"> <link rel="apple-touch-icon-precomposed" sizes="57x57" href="../../../../docs/images/canjs_favicon_57x57.png"> <link rel="apple-touch-icon" sizes="72x72" href="../../../../docs/images/canjs_favicon_72x72.png"> <link rel="apple-touch-icon" sizes="114x114" href="../../../../docs/images/canjs_favicon_114x114.png"> <link rel="apple-touch-icon" sizes="120x120" href="../../../../docs/images/canjs_favicon_128x128.png"> <link rel="apple-touch-icon" sizes="144x144" href="../../../../docs/images/canjs_favicon_144x144.png"> <link rel="apple-touch-icon" sizes="152x152" href="../../../../docs/images/canjs_favicon_152x152.png"> <meta content="yes" name="apple-mobile-web-app-capable"> <meta name="apple-mobile-web-app-status-bar-style" content="white-translucent"> <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-2302003-11', 'auto'); ga('send', 'pageview'); </script> </head> <body> <input type="checkbox" id="nav-trigger" class="nav-trigger"/> <label for="nav-trigger">Menu</label> <div id="everything"> <div id="left" class="column"> <div class="top-left"> <div class="brand"> <div class="logo"> <a href="../../../../index.html" alt="CanJS"></a> <div class="dropdown project-dropdown"> <a href="https://donejs.com/">DoneJS</a> <a href="http://stealjs.com/">StealJS</a> <a href="http://jquerypp.com/">jQuery ++</a> <a href="https://funcunit.com/">FuncUnit</a> <a href="http://documentjs.com/">DocumentJS</a> </div> </div> <div class="version"> <div class="version-number"> 3.0.0 </div> <div class="dropdown version-dropdown"> <a href="https://v2.canjs.com">2.3.27</a> </div> </div> </div> <div class="search-bar"> <p>   </p> </div> </div> <div class="bottom-left"> <div class="social-side-container"> <ul class="social-side"> <li> <a class="header-mobile github" href="https://github.com/canjs/canjs" target="_blank"><img class="social-icon-small" src="../../../../docs/images/github.png">Github</a> </li> <li> <a class="header-mobile twitter" href="https://twitter.com/canjs" target="_blank"><img class="social-icon-small" src="../../../../docs/images/twitter.png">Twitter</a> </li> </ul> <ul class="social-side"> <li> <a class="header-mobile" href="https://gitter.im/canjs/canjs" target="_blank">Chat</a> </li> <li> <a class="header-mobile" href="http://forums.donejs.com/c/canjs" target="_blank">Forum</a> </li> </ul> </div> <ul> <li class=" "> <a class="page" href="../../../guides.html" title="Welcome to CanJS! 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Use it to assemble powerful model layers for any JavaScript project."> can-connect </a> <ul> <li> <span>behaviors</span> <ul> <li class=" "> <a class="module" href="../../base/base.html" title="The base behavior added to every connect behavior."> ./base/ </a> </li> <li class=" "> <a class="module" href="../../cache-requests/cache-requests.html" title="Caches reponse data and uses it to prevent future requests or make future requests smaller."> ./cache-requests/ </a> </li> <li class=" "> <a class="module" href="../../can/map/map.html" title="Make a connection use a map type."> ./can/map/ </a> </li> <li class=" "> <a class="module" href="../../can/ref/ref.html" title="Handle references to instances in the raw data returned by the server."> ./can/ref/ </a> </li> <li class=" "> <a class="module" href="../../constructor/callbacks-once/callbacks-once.html" title="Prevents unecessary calls to the instance callback methods."> ./constructor/callbacks-once/ </a> </li> <li class=" "> <a 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data-count-api="/repos/canjs/canjs#stargazers_count">Star</a> </li> <li> <a href="https://twitter.com/canjs" class="twitter-follow-button nav-social" data-show-count="true" data-show-screen-name="false">Follow @canjs</a><script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script> </li> </ul> </div> <div class="breadcrumb"> <li><a href="../../../../index.html">CanJS</a></li> / <li><a href="../../../can-core.html">Core</a></li> / <li><a href="../../../can-connect.html">can-connect</a></li> / <li><a href="worker.html">./data/worker/</a></li> <li class="breadcrumb-dropdown">/ <a> On this page</a> <ul class="on-this-page"></ul> </li> <div class="nav-toggle" title="Back to top"></div> </div> </div> <div class="bottom-right"> <article> <section class="title"> <div class="page-type"> <h1>can-connect/data/worker/worker</h1> <div>module</div> </div> <section class="description"> <p>Connects a connection to another connection in a worker thread.</p> </section> </section> <section class="on-this-page-table"> </section> <section class="title-footer"> <ul class="title-links">  <li><a href="//github.com/canjs/can-connect/tree/v1.0.11/data/worker/worker.md">source</a></li>   </ul> </section> <div class="signature"> <h2 class="signature-title"> <code>dataWorker( baseConnection )</code> </h2> <p>If a <a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers">Worker</a> is provided, overwrites the "data interface methods" to package the arguments and send them as part of a <code>postMessage</code> to the Worker.</p> <p>If a <code>Worker</code> is not provided, it is assumed "data-worker" is being added within a worker thread. It listens to messages sent to the Worker, calls the specified "data interface method" and sends a message back with the result.</p> <p>Any data methods called on the <code>window</code> connection will wait until the <code>worker</code> connection has established a handshake.</p> </div> <section class="body"> <h2>Use</h2> <p>The best way to use <code>data/worker</code> is to create a connection module that works when loaded in either the <code>window</code> or in a <a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers">Worker</a>. This pattern tends to work even if workers are not supported.</p> <p>The following creates a connection that does the work of <a href="../../cache-requests/cache-requests.html" title="Caches reponse data and uses it to prevent future requests or make future requests smaller.">can-connect/cache-requests/cache-requests</a>, <a href="../url/url.html" title="">can-connect/data/url/url</a>, and <a href="../memory-cache/memory-cache.html" title="Saves raw data in JavaScript memory that disappears when the page refreshes.">can-connect/data/memory-cache/memory-cache</a> in a worker thread.</p> <div class='demo_wrapper' data-demo-src='demos/can-connect/data-worker.html'></div> <p>The <code>todo_connection</code> module can be found <a href="https://github.com/canjs/can-connect/blob/master/src/data/worker/demo/todo_connection.js">here</a> and looks like the following:</p> <pre><code class="language-js">var connect = require("can-connect"); var fixture = require("can-fixture"); // If we are in the main thread, see if we can load this same // connection in a worker thread. var worker; if(typeof document !== "undefined") { worker = new Worker( System.stealURL+"?main=can-connect/data/worker/demo/todo_connection" ); } // create cache connection var cache = connect([ require("can-connect/data/memory-cache/") ],{ name: "todos" }); // Create the main connection with everything you need. If there is a worker, // all data interface methods will be sent to the worker. var todosConnection = connect([ require("can-connect/data/url/url"), require("can-connect/cache-requests/cache-requests"), require("can-connect/data/worker/worker"), require("can-connect/constructor/constructor"), require("can-connect/constructor/store/store") ],{ url: "/todos", cacheConnection: cache, worker: worker, name: "todos" }); fixture.delay = 1000; fixture({ "GET /todos": function(request){ return {data: [ {id: 1, name: "wash dishes"}, {id: 2, name: "mow lawn"}, {id: 3, name: "do laundry"} ]}; } }); module.exports = todosConnection; </code></pre> <p>The things to notice:</p> <ol> <li><p>A <code>Worker</code> should be passed as the <a href="worker.worker.html" title="">worker</a> option that loads a connection with the same name as the connection in the <code>window</code>. In thise case, the same connection module is loaded so everything works.</p></li> <li><p>A single <code>Worker</code> could load multiple connection modules and perform other behaviors.</p></li> </ol> <h3>Split Connection Logic</h3> <p>THe previous example used a single module that was loaded by both the window and the worker. This doesn't have to be the case. Two different modules could be used. For example, <code>todo-window.js</code> and <code>todo-worker.js</code>. Each might look like:</p> <pre><code class="language-js">// todo-window.js var workerURL = System.stealURL+"?main=app/models/todo-worker"; var todoConnection = connect([ require("can-connect/data/worker/worker"), require("can-connect/constructor/constructor"), require("can-connect/constructor/store/store"), { worker: new Worker( workerURL ), name: "todos" }); </code></pre> <pre><code class="language-js">// todo-worker.js var cache = connect([ require("can-connect/data/memory-cache/memory-cache") ],{ name: "todos-cache" }); var todoConnection = connect([ require("can-connect/data/url/url"), require("can-connect/cache-requests/cache-requests"), require("can-connect/data/worker/worker") ],{ url: "/todos", cacheConnection: cache, name: "todos" }); </code></pre> <p>However, the problem with the two-module approach is that it will not work if Workers are not supported by your browser.</p> </section> <script type="text/javascript"> var docObject = {"src":{"path":"node_modules/can-connect/data/worker/worker.md"},"description":"\nConnects a connection to another connection in a worker thread.\n","type":"module","title":"","name":"can-connect/data/worker/worker","parent":"can-connect.behaviors","signatures":[{"code":"dataWorker( baseConnection )","description":"\n\nIf a [Worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers)\nis provided, overwrites the \"data interface methods\" to package the arguments and send them as\npart of a `postMessage` to the Worker.\n\n\nIf a `Worker` is not provided, it is assumed \"data-worker\" is being added\nwithin a worker thread. It listens to messages sent to the Worker, calls the specified \"data interface method\"\nand sends a message back with the result.\n\nAny data methods called on the `window` connection will wait until the `worker` connection\nhas established a handshake.\n","params":[]}],"comment":" ","pathToRoot":"../../../.."}; </script> </article> <footer><p>CanJS is part of <a href="http://donejs.com" target="_blank">DoneJS</a>. Created and maintained by the core <a href="https://donejs.com/About.html#section=section_Team" target="_blank">DoneJS team</a> and <a href="http://bitovi.com" target="_blank">Bitovi</a>. <strong>Currently 3.0.0.</strong></p></footer> </div> </div> </div> <script> steal = { instantiated: { "bundles/bit-docs-site/static.css!$css" : null } }; </script> <script type='text/javascript' data-main="bit-docs-site/static" src="../../../static/node_modules/steal/steal.production.js"></script> <script async defer src="https://buttons.github.io/buttons.js"></script> </body> </html>