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Intro.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Espresso Framework</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="javascripts/jquery.js" type="text/javascript"></script>
<link href="javascripts/bootstrap/css/bootstrap.min.css" rel="stylesheet" />
<link href="javascripts/bootstrap/css/bootstrap-responsive.min.css" rel="stylesheet" />
<script src="javascripts/bootstrap/js/bootstrap.min.js" type="text/javascript"></script>
<link href="javascripts/google-code-prettify/prettify.css" type="text/css" rel="stylesheet" />
<script src="javascripts/google-code-prettify/prettify.js" type="text/javascript"></script>
<link href="stylesheets/master.css" type="text/css" rel="stylesheet" />
</head>
<body>
<div class="container">
<div class="row">
<div class="span2">
<a href="index.html">
<img src="images/logo.png" class="pull-right logo" /></a>
</div>
<div class="span6">
<h1>
<a href="index.html">
Espresso Framework</a>
</h1>
<h4>
Scalable Web Framework aimed at Speed and Simplicity
</h4>
</div>
<div class="span pull-right">
<div class="row">
<div class="span">
<h4>
<a href="presentation.html">
Official Presentation</a>
</h4>
<h4 style="white-space: nowrap;">
<a href="Events.html">
Events</a> |
<a href="CHANGELOG.html">
Change Log</a>
</h4>
</div>
</div>
</div>
</div>
<hr/>
<div class="row" style="text-align: center;">
<div class="btn-toolbar">
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Intro.html" class="btn">
Intro</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Intro.html#actions">
Actions</a>
</li>
<li>
<a href="Intro.html#controllers">
Controllers</a>
</li>
<li>
<a href="Intro.html#slices">
Slices</a>
</li>
<li>
<a href="Intro.html#mvc-">
MVC?</a>
</li>
<li>
<a href="Intro.html#models-">
Models?</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Routing.html" class="btn">
Routing</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Routing.html#base-url">
Base URL</a>
</li>
<li>
<a href="Routing.html#canonicals">
Canonicals</a>
</li>
<li>
<a href="Routing.html#actions">
Actions</a>
</li>
<li>
<a href="Routing.html#action-mapping">
Action Mapping</a>
</li>
<li>
<a href="Routing.html#action-aliases">
Action Aliases</a>
</li>
<li>
<a href="Routing.html#parametrization">
Parametrization</a>
</li>
<li>
<a href="Routing.html#format">
Format</a>
</li>
<li>
<a href="Routing.html#restful-actions">
RESTful Actions</a>
</li>
<li>
<a href="Routing.html#rewriter">
Rewriter</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Setup.html" class="btn">
Setup</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Setup.html#global-setup">
Global Setup</a>
</li>
<li>
<a href="Setup.html#setup-by-name">
Setup by Name</a>
</li>
<li>
<a href="Setup.html#setup-by-format">
Setup by Format</a>
</li>
<li>
<a href="Setup.html#remote-setup">
Remote Setup</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Workflow.html" class="btn">
Workflow</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Workflow.html#route">
Route</a>
</li>
<li>
<a href="Workflow.html#params">
Params</a>
</li>
<li>
<a href="Workflow.html#passing-control">
Passing Control</a>
</li>
<li>
<a href="Workflow.html#fetching-body">
Fetching Body</a>
</li>
<li>
<a href="Workflow.html#halt">
Halt</a>
</li>
<li>
<a href="Workflow.html#redirect">
Redirect</a>
</li>
<li>
<a href="Workflow.html#reload">
Reload</a>
</li>
<li>
<a href="Workflow.html#error-handlers">
Error Handlers</a>
</li>
<li>
<a href="Workflow.html#hooks">
Hooks</a>
</li>
<li>
<a href="Workflow.html#authorization">
Authorization</a>
</li>
<li>
<a href="Workflow.html#sessions">
Sessions</a>
</li>
<li>
<a href="Workflow.html#flash">
Flash</a>
</li>
<li>
<a href="Workflow.html#cookies">
Cookies</a>
</li>
<li>
<a href="Workflow.html#content-type">
Content Type</a>
</li>
<li>
<a href="Workflow.html#charset">
Charset</a>
</li>
<li>
<a href="Workflow.html#cache-control">
Cache Control</a>
</li>
<li>
<a href="Workflow.html#expires">
Expires</a>
</li>
<li>
<a href="Workflow.html#last-modified">
Last Modified</a>
</li>
<li>
<a href="Workflow.html#accepted-content-type">
Accepted Content Type</a>
</li>
<li>
<a href="Workflow.html#cache-manager">
Cache Manager</a>
</li>
<li>
<a href="Workflow.html#send-file">
Send File</a>
</li>
<li>
<a href="Workflow.html#send-files">
Send Files</a>
</li>
<li>
<a href="Workflow.html#attachment">
Attachment</a>
</li>
<li>
<a href="Workflow.html#headers">
Headers</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="ViewAPI.html" class="btn">
View API</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="ViewAPI.html#engine">
Engine</a>
</li>
<li>
<a href="ViewAPI.html#extension">
Extension</a>
</li>
<li>
<a href="ViewAPI.html#templates-path">
Templates Path</a>
</li>
<li>
<a href="ViewAPI.html#layouts-path">
Layouts Path</a>
</li>
<li>
<a href="ViewAPI.html#layout">
Layout</a>
</li>
<li>
<a href="ViewAPI.html#rendering-templates">
Rendering Templates</a>
</li>
<li>
<a href="ViewAPI.html#rendering-layouts">
Rendering Layouts</a>
</li>
<li>
<a href="ViewAPI.html#ad-hoc-rendering">
Ad hoc Rendering</a>
</li>
<li>
<a href="ViewAPI.html#path-resolver">
Path Resolver</a>
</li>
<li>
<a href="ViewAPI.html#templates-compilation">
Templates Compilation</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Streaming.html" class="btn">
Streaming</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Streaming.html#server-sent-events">
Server-Sent Events</a>
</li>
<li>
<a href="Streaming.html#websockets">
WebSockets</a>
</li>
<li>
<a href="Streaming.html#chunked-responses">
Chunked Responses</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Assets.html" class="btn">
Assets</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Assets.html#tag-helpers">
Tag Helpers</a>
</li>
<li>
<a href="Assets.html#assets-mapper">
Assets Mapper</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="CRUD.html" class="btn">
CRUD</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="CRUD.html#intro">
Intro</a>
</li>
<li>
<a href="CRUD.html#resource">
Resource</a>
</li>
<li>
<a href="CRUD.html#excluded-params">
Excluded Params</a>
</li>
<li>
<a href="CRUD.html#root">
Root</a>
</li>
<li>
<a href="CRUD.html#response">
Response</a>
</li>
<li>
<a href="CRUD.html#error-handler">
Error Handler</a>
</li>
<li>
<a href="CRUD.html#access-restriction">
Access Restriction</a>
</li>
</ul>
</div>
<div class="btn-group" style="text-align: left; margin: 5px;">
<a href="Deploy.html" class="btn">
Deploy</a>
<button class="btn dropdown-toggle" data-toggle="dropdown">
<span class="caret"></span>
</button>
<ul class="dropdown-menu">
<li>
<a href="Deploy.html#controllers">
Controllers</a>
</li>
<li>
<a href="Deploy.html#slices">
Slices</a>
</li>
<li>
<a href="Deploy.html#roots">
Roots</a>
</li>
<li>
<a href="Deploy.html#run">
Run</a>
</li>
<li>
<a href="Deploy.html#config-ru">
config.ru</a>
</li>
</ul>
</div>
</div>
</div>
<hr/>
<h2 id='actions'><a href='#actions'>Actions</a></h2>
<p>The cornerstone of any Espresso app.</p>
<p>Namely, actions are the workhorses that creates the routes to be served by app, as well as running our code.</p>
<p>If we need user to see "Hello World!" when he visits "/hello" address in the browser, we simply do like this:</p>
<pre>
def hello
"Hello World!"
end
</pre>
<p>It is really straightforward to define actions in Espresso cause they are usual Ruby methods.</p>
<p><strong>[ <a href="#">contents ↑</a> ]</strong></p>
<h2 id='controllers'><a href='#controllers'>Controllers</a></h2>
<p>A controller is meant to organize and setup actions.</p>
<p>The basic setup is base URL. It is defaulted to the controller's underscored name and are used by all actions.</p>
<p>Other setups are action-specific and can be set for N or for all actions.<br/>
To define a setup for all actions, simply call appropriate method at controller's class level.<br/>
To setup specific actions, call appropriate methods inside <code>setup</code> proc that will accept action names as arguments.<br/>
Action names can also be given as regular expressions.</p>
<p><strong>Example:</strong> - Creating a controller that will serve "/pages/latest" and "/pages/rss" URLs</p>
<pre>
class Pages < E
# setup for all actions
charset 'UTF-8'
# setup for `rss` action
setup :rss do
content_type '.rss'
end
def latest
# ...
end
def rss
# ...
end
end
</pre>
<p>That's it, controllers are usual Ruby classes with inheritance from <code>E</code> class.</p>
<p><strong>[ <a href="#">contents ↑</a> ]</strong></p>
<h2 id='slices'><a href='#slices'>Slices</a></h2>
<p>A slice is meant to organize and setup controllers.</p>
<p>The basic setup is, again, base URL. It is used by all controllers.</p>
<p>Other setups are controller-specific and can be set for N or all controllers.</p>
<p>A slice is a usual Ruby module containing Espresso controllers.<br/>
It can be mounted under any path that will serve as base URL for all controllers inside.</p>
<p><strong>Example:</strong> - Create a slice that will serve "/cms/articles", "/cms/news" and "/cms/pages" URLs</p>
<pre>
module Cms
class Articles < E
# ...
end
class News < E
# ...
end
class Pages < E
# ...
end
end
app = Cms.mount '/cms'
# or just `Cms.mount` to mount the slice into / and serve
# "/articles", "/news" and "/pages" URLs
app.run
</pre>
<p>To setup controllers, simply pass a block to <code>mount</code> method.</p>
<p>Let's say we have N controllers that using Haml engine.<br/>
Then we simply do like this:</p>
<pre>
app = MySlice.mount do
engine :Haml
end
app.run
</pre>
<p>When you need to setup only a specific controller,
use the mount block with a single param that will be set to the controller
actually being configured.</p>
<pre>
app = MySlice.mount do |ctrl|
engine :ERB if ctrl == Articles
end
</pre>
<p><strong>[ <a href="#">contents ↑</a> ]</strong></p>
<h2 id='applications'><a href='#applications'>Applications</a></h2>
<p>Applications are meant to bundle, setup and run controllers and slices.</p>
<p>To create a new Espresso application use <code>EApp</code> class:</p>
<pre>
class MyController < E
# ...
end
app = EApp.new
app.mount MyController
app.run
</pre>
<h2 id='mvc-'><a href='#mvc-'>MVC?</a></h2>
<p>Though you can create MVC applications by using Espresso Framework,
it does not actually impose any design patterns.</p>
<p>You are the creator and you are free to choose how to develop your app.</p>
<p><strong>[ <a href="#">contents ↑</a> ]</strong></p>
<h2 id='models-'><a href='#models-'>Models?</a></h2>
<p>Espresso by itself does not deal with models, migrations etc.</p>
<p>It is the responsibility of the ORM you choose to use.</p>
<p><strong>[ <a href="#">contents ↑</a> ]</strong></p>
<hr/>
<footer class="footer well">
<div class="row">
<div class="span4">
<p>
License: MIT
</p>
<p>
Author: Silviu Rusu
</p>
<p>
Source Code:
<a href="https://github.com/espresso/espresso">
https://github.com/espresso/espresso</a>
</p>
</div>
<div class="span6 pull-right">
<p>
Issues/Bugs:
<a href="https://github.com/espresso/espresso/issues">
https://github.com/espresso/espresso/issues</a>
</p>
<p>
<strong>Contributors are very Welcome!</strong>
</p>
<p>
IRC channel: #espressorb on irc.freenode.net
</p>
</div>
</div>
</footer>
</div>
<a href="https://github.com/espresso/espresso"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_gray_6d6d6d.png" alt="Fork me on GitHub"></a>
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