6. JRuby on AppEngine
It rocks, but has some limitations.
Friday, September 10, 2010
7. Limitations
• Not as supported as Java & Python
• Long spin up times
• Uses more CPU(more expensive)
• getting more performance requires writing
Java
Friday, September 10, 2010
8. Spin Up
• Rails app instances take a long time to spin
up
• you can’t keep app instances running (yet)
Friday, September 10, 2010
9. Long Spin Up Times
• Rails instances take 16 seconds or more to
spin up
• AppEngine limits requests to 30 seconds
• Users will hit cold instances
Friday, September 10, 2010
10. Spin Up Workarounds
DeferredDispather
• Splits Initialization into three requests(two
redirect back)
• runtime & rack
• require app
• dispatch normally
Friday, September 10, 2010
12. CPU Usage
• On AppEngine CPU == $$$$
• JRuby uses more CPU than Java or Python
Friday, September 10, 2010
13. CPU Usage
• On AppEngine CPU == $$$$
• JRuby uses more CPU than Java or Python
Friday, September 10, 2010
14. JRuby on AppEngine
Optimization
1. Write app in Rails
2. Find parts that are slow/get heavy traffic
3. Rewrite them with Java Servlets
Friday, September 10, 2010
20. Mirah - Ruby in Javanese
Friday, September 10, 2010
21. “Charles Oliver Nutter wanted to create
a language that essentially looked like
Ruby, but was statically typed and
compiled to fast JVM bytecode.
Mirah is the result.”
- mirah.org
Friday, September 10, 2010
22. Mirah
• Uses Ruby syntax+types
• Behaves like Java
• Extensible through macros
Friday, September 10, 2010
39. High Performance,
Light weight,
Rails like
Friday, September 10, 2010
40. import dubious.*
import models.*
class ContactsController < ApplicationController
# GET /contacts
def index
@contacts = Contact.all.run
render index_erb, main_erb
end
# GET /contacts/1
def show
@contact = Contact.get(params.id)
render show_erb, main_erb
end
# GET /contacts/new
def new
@contact = Contact.new
render new_erb, main_erb
end
# GET /contacts/1/edit
def edit
@contact = Contact.get(params.id)
Friday, September 10, 2010
41. import dubious.*
import models.*
class ContactsController < ApplicationController
# GET /contacts
def index
@contacts = Contact.all.run
render index_erb, main_erb
end
# GET /contacts/1
def show
@contact = Contact.get(params.id)
render show_erb, main_erb
end
# GET /contacts/new
def new
@contact = Contact.new
render new_erb, main_erb
end
# GET /contacts/1/edit
def edit
@contact = Contact.get(params.id)
Friday, September 10, 2010
42. import dubious.*
import models.*
class ContactsController < Appli
# GET /contacts
def index
@contacts = Contact.all.run
render index_erb, main_erb
end
Friday, September 10, 2010
43. end
# GET /contacts/new
def new
@contact = Contact.new
render new_erb, main_erb
end
# GET /contacts/1/edit
def edit
@contact = Contact.get(param
render edit_erb, main_erb
end
Friday, September 10, 2010
44. end
# render templates
def_edb(index_erb,
'views/contacts/index.html.erb')
def_edb(show_erb,
'views/contacts/show.html.erb')
def_edb(new_erb,
'views/contacts/new.html.erb')
def_edb(edit_erb,
'views/contacts/edit.html.erb')
def_edb(main_erb,
'views/layouts/contacts.html.erb')
end
Friday, September 10, 2010
45. import com.google.appengine.ext.duby.db.Model
import com.google.appengine.api.datastore.*
import dubious.TimeConversion
import java.util.Date
class Contact < Model
property :title, String
property :birthday, Date
property :url, Link
property :platform, String
property :editor, String
property :summary, Text
property :address, PostalAddress
property :phone, PhoneNumber
property :private, Boolean
# timestamps
property :created_at, Date
property :updated_at, Date
def before_save
@updated_at = Date.new
@created_at = updated_at if @created_at.nil?
end
def coerce_date(o:Object)
TimeConversion.new('jsdate').parse(String(o))
Friday, September 10, 2010 end
46. import com.google.appengine.ext.duby.db.Model
import com.google.appengine.api.datastore.*
import dubious.TimeConversion
import java.util.Date
class Contact < Model
property :title, String
property :birthday, Date
property :url, Link
property :platform, String
property :editor, String
property :summary, Text
property :address, PostalAddress
property :phone, PhoneNumber
property :private, Boolean
# timestamps
property :created_at, Date
property :updated_at, Date
def before_save
@updated_at = Date.new
@created_at = updated_at if @created_at.nil?
end
def coerce_date(o:Object)
TimeConversion.new('jsdate').parse(String(o))
Friday, September 10, 2010 end
