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Jermolene 2013-12-14 09:46:10 +00:00
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editions/tw5.com/tiddlers/mechanisms/BootMechanism.tid
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created: 201308251429 created: 20130825142900000
modified: 201310312218 modified: 20131214093453953
tags: mechanism tags: mechanism
title: BootMechanism title: BootMechanism
type: text/vnd.tiddlywiki
!Introduction !Introduction
@ -26,15 +27,15 @@ The boot kernel includes:
* Code for the browser to load tiddlers from the HTML DOM * Code for the browser to load tiddlers from the HTML DOM
* Code for the server to load tiddlers from the file system * Code for the server to load tiddlers from the file system
Each module is an ordinary `Node.js`-style module, using the `require()` function to access other modules and the `exports` global to return JavaScript values. The boot kernel smooths over the differences between `Node.js` and the browser, allowing the same plugin modules to execute in both environments. Each module is an ordinary CommonJS module, using the `require()` function to access other modules and the `exports` global to return JavaScript values. The boot kernel smooths over the differences between `Node.js` and the browser, allowing the same plugin modules to execute in both environments.
In the browser, `core/boot.js` is packed into a template HTML file that contains the following elements in order: In the browser, `core/boot.js` is packed into a template HTML file that contains the following elements in order:
* Ordinary and system tiddlers, packed as HTML `<DIV>` elements * Ordinary and system tiddlers, packed as HTML `<DIV>` elements
* `core/bootprefix.js`, containing a few lines to set up the plugin environment * `core/bootprefix.js`, containing a few lines to set up the plugin environment
* JavaScript modules, packed as HTML `<SCRIPT>` blocks * Optional JavaScript modules, packed as HTML `<SCRIPT>` blocks
* `core/boot.js`, containing the boot kernel * `core/boot.js`, containing the boot kernel
On the server, `core/boot.js` is executed directly. It uses the `Node.js` local file API to load plugins directly from the file system in the `core/modules` directory. The code loading is performed synchronously for brevity (and because the system is in any case inherently blocked until plugins are loaded). On the server, `core/boot.js` is executed directly. It uses the `Node.js` local file API to load plugins directly from the file system in the `core/modules` directory. The code loading is performed synchronously for brevity (and because the system is in any case inherently blocked until plugins are loaded).
The boot kernel sets up the `$tw` global variable that is used to store all the state data of the system. The boot process sets up the `$tw` global variable that is used to store all the state data of the system.