hi

Expanding
Our Vision With
MERB

Advanced
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”

meh

not as interesting
as the background

:o

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 \"Purge inactive nodes.\"
task :purge => [:merb_env] do
Node.inactive.purge
end
desc \"Scan for nodes\"
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

<script type=“text/javascript”
src=“/comments.js”></script>

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

Rack

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

Fin.

HAHA