Adventurous Merb

Expanding Our Vision With MERB

Advanced MERB

Adventurous MERB

INTRODUCTION

Matt Todd

mtodd http://github.com/mtodd/ Halcyon Highgroove Studios Developer & OSS Architect http://highgroove.com

SWEET NECTAR OF THE GODS

EXPECTATIONS

I AM NOT AN EXPERT

WARNING code for: PROBLEMS & examples

lack of imagination

The Foreground

“forefront, prominent or important position”

not as interesting as the background

The Background

DBs Caches Background Processes Web Services Embedded Components Distributed Grid/Mesh Apps AJAX Rack

DBs x Caches x Background Processes √ Web Services √ Embedded Components √ Distributed Grid/Mesh Apps √ AJAX x Rack √

Background Processes

rake tasks

namespace(:nodes) do desc quot;Purge inactive nodes.quot; task :purge => [:merb_env] do Node.inactive.purge end desc quot;Scan for nodesquot; task :scan => [:merb_env] do Node.detach_and_scan(Node.first) end end

render_then_call run_later

render_then_call do Node.inactive.purge end ### OR run_later do Node.scan(Node.first) end render

we’ll talk later

Web Services

“software system designed to support interoperable machine-to-machine interaction over a network”

a service over the web just for apps

JSON is REALLY Awesome

JSON is FUCKING Awesome

{“foo”:“bar”}

RESTful

GET /objects.json index PUT /objects.json create GET /objects/1.json show DELETE /objects/1.json delete POST /objects/1.json update

Merb’s Way

provides render display

provides

class Posts < Application 1. provides :json def show @post = Post.get(params[:id]) display @post end end

NO BITCH! GIMME XML!

GET /posts/1.xml 406 Not Acceptable

display

class Posts < Application 1. provides :json def show @post = Post.get(params[:id]) 2. display @post end end

respond_to do |format| format.html { render } format.json { @post.to_json } end Rails vs case content_type Merb when :html render when :json display @post end

even better:

renders XML, JSON, and HTML provides :json, :xml @post = Post.get(params[:id]) display @post AUTOMATICALLY fuck yeah!

Embedded Components

document.write( ‘<div id=“comments”></div>’ ); $(function(){ <% @comments.each do |c| c = $(“<p><%=c.body%></p>”); c.attr(‘id’,“comment-<%=c.id%>”); c.appendTo(‘#comments’); <% end %> });

github.com/ mtodd/aceldama

glorified JS & AJAX

Distributed Grid/Mesh Apps

Centralized S S S M S S

Distributed N N N N N

{ S M slave master N node

Foreground ` /sites N [{id:1, [{id:1, url:“http://github.com/”, rating:1, created_at:...},...] created_at:...},...] /sites.json /sites/n/reports.json Background

github.com/ mtodd/conley

AWESOME

Framework’s Framework

Request Merb Middleware Rack Response Mongrel

mongrel thin ebb webrick etc

class YourApp def call(env) [ 200, {‘Content-Type’=>‘text/plain’}, “OK” ] end end

Middleware

mini apps modifies env avoid passing through

class RackMiddlewareExample def initialize(app) @app = app end def call(env) # voodoo @app.call(env) end end

gist.github.com/ 16369

Adventurous Merb

by Matt Todd on Oct 12, 2008

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