运用 Rails 开发企业应用程序Enterprise App Dev in Rails- the .NET perspective

Eric Guo 过纯中

twitter.com/ecguo OR weibo.com/ecguo

Agenda

• Why Rails fits the Enterprise needs

• Rails Toolchain and Gems in Windows

• Typical Enterprise App – pl-form

• Scaffold custom

• Reporting in Excel

• Interoperation

• Deploy in Ubuntu and migrate to Linux

• 为何 Rails 是企业的良好选择

• Windows 下的 Rails 工具箱和 Gems

• 典型企业应用 – 电子表单

• 脚手架的定制

• 导出 Excel 报告

• 与现有系统的互操作性

• 部署到 Ubuntu ，逐步转移到 Linux

Enterprise vs Internet application – Same facts

Community

Trends

Development Speed

Operation

Inter-operation

Enterprise vs Internet application - Difference

• No special performance req

• Complex biz model rule

• Focus on IE or Firefox only

• Open half function for

current function

• Scalability

• Relative easy rule

• Cross-browser

• Close-loop function with full

automation

Why Rails fits the Enterprise needs

Before Rails, I already learned…

ASP.NET

Silverlight

Hibernate 3

Entity Framework

Telerik OpenAccess

WCF – Windows Communication

Foundation

PowerShell

I’m still a good citizen in Microsoft empire, but Web is future!

Three thing drive me switch to Rails

•ASP.NET MVC 3 vs Rails

•Cloud Foundry China Open

Tour 2012, Mark Lucovsky

•The Hackathon in May

2012, Shanghai, 60%

developer choose Rails

Rails adv and disadvantage in Enterprise View

• High density function/code ratio

• Full Stack Web Framework

• ORM, DB Migrate, Ajax, MVC model, template,

Testing framework, Caching, i18n.

• Function organized very well, Totally integrated.

• Good design pattern from .NET, Java, PHP, Perl

community, but no compatibility issue/debt in

design

• Open source

• Not as popular as Java and .NET

• Inter-operation

• Learning Gap

• Essential in HTML/CSS/JavaScript vs ASP.NET

• Command line vs Click GUI

• Toolchain problem in Windows

• Dynamic type vs Static type

• GFW (in china only)

Why Rails code have high density

self.part_request.part_request_details.each do |d|

status = 'Partial' if d.status != self.status

End self.part_request.save

Rails Code

• SELECT p.status INTO &PartRequestStatus FROM part_requests pWHERE p.id=&PartRequestID;

• SELECT d.status FROM part_request_details dWHERE d.part_request_id = &PartRequestID;

• UPDATE part_request_details d SET d.status='Partial'WHERE d.part_request_id = &PartRequestID; AND d.status <> &PartRequestStatus;

• COMMIT;

SQL Code (C# ADO.NET code not include yet…)

After ADO.NET code mixed with SQL…

It’s just one SQL statement, to get qty like previous SQL:

SELECT p.status INTO &PartRequestStatus FROM part_requests p

Some NOT correct fact about Rails

Windows is not friendly for RailsWindows is not friendly for RailsWindows is the easiest setup rails development platform if no issue happen.No source for ruby-1.9.3-p327 provided with debugger-ruby_core_source gem

Rails is magic and complex web frameworkRails is magic and complex web framework

Complex at beginning but flat learning curve after.

VIM, Git, Python, Linux, is pre-requestVIM, Git, Python, Linux, is pre-request

Mac is best environment for RailsMac is best environment for Rails

Focus the REAL value thing, “Getting Real”

Double cost hardware, no IE, Mountain Lion, Java story

Java and Apple

Java, Built In• “Write once, run anywhere” is true only if Java

is everywhere. With OS X, you know the Java Runtime is there for your applications, because it is built into the operating system. This means that when developing Java applications for deployment on OS X, you know that Java is already installed and configured to work with your customer’s Mac.

• Java is the only high-level framework on OS X besides Cocoa that provides a graphical toolkit for building applications.

https://developer.apple.com/library/mac/#documentation/Java/Conceptual/Java14Development/01-JavaOverview/JavaOverview.htmlMac OS X 10.6 Snow Leopard

Java Deprecation• As of the release of Java for OS X v10.6

Update 3, the Java runtime ported by Apple and that ships with OS X is deprecated. Developers should not rely on the Apple-supplied Java runtime being present in future versions of OS X.

• Apple deprecated Java and announced that applications using deprecated technologies such as Java won't be allowed in its official Mac Apps Store.

• Apple never promised the world to do no evil, but ... Oh well. It's clearly no angel.

• http://www.theregister.co.uk/2010/10/21/apple_threatens_to_kill_java_on_the_mac/

RubyMotion won’t success on iOS development.Web is the only correct way to development app.

Mac OSX pitfall and ruby issue in weibo

Issue will also happen in Ubuntu with RVM

Stranger will not be friendly,

same thing if out of

recognition/knowledge in

Ruby on Rails

Try below if you using 1.9.3-

p327:

•gem install pry-debugger

•pry

Rails in Windows

Install, Toolchain, Gems

Rails in Windows - Installation

• http://rubyinstaller.org/

• DevKit-tdm-32-4.5.2-20111229-1559-sfx.exe

• https://github.com/oneclick/rubyinstaller/wiki/

Development-Kit

• C:\git>cd \devkit

• C:\DevKit>ruby dk.rb init

• C:\DevKit>ruby dk.rb install --force

• ansicon - Process ANSI escape sequences for

Windows console programs.

• Install Rubymine and Click Debug to install relative

debug gems

• gem upgrade –system

• gem upgrade

• gem install pry-debugger

• gem install bundle

• gem install ruby-oci8

• cd pl-form

• bundle install

Rails in Windows - Toolchain

• ActivePython 2.7

• Node.JS 0.8 or higher

• Sublime Text

• Git

• Firefox

• SSD

Req by Gems like pygments in Octopress

Req by Gems like ExecJS

Many plugin available for Rails

Git Extensions works great in Windows

Extension: SQLite, RESTClient with low memory

The typical bottleneck for rails eliminated

Rails in Windows - Gems

Some gems can NOT run in

windows: therubyracer

(replace with execjs)

gem install eventmachine –pre

gem install thin

more on:

http://ruby-china.org/wiki/win3

2-gem

Enterprise App- pl-form

PaperLess form semi-

generate template

application

The PaperLess-Forms Application

Eliminate all existing paper

based forms in Enterprise

• Not only save paper and

cost, but by human power

• Search quickly in form

directly.

• HTML5 for anydevice and

RESTful API for integration

User define forms instead of developer

A easy text format

DSL (Domain-Specific

Language)

• Header-Detail forms

supported

• Pre-defined Items

and Specs supported

User define forms in Text

Apply in Enterprise only

• Training better than

dummy design

• Text is better than GUI

• Code is better than

Configuration

• There is no advanced

user, only developer

PL-Forms features for Developer

• PL-Forms will generate forms

web page and underline support

program based on user define

forms

• Restful API available for every

forms after form generate

• Filled form data is in database table,

header, detail has two different

table, form field mapping to table

column, make writing SQL query

easy

• All source code and change history

available

PL-Forms more detail feature

• Typeahead auto complete

• Item and Spec as detail field

description

• Recent form quick list

• Define status code per each

forms (optional)

• input/update/delete action

will be record now, not only

including last one, all in

history

Rails Scaffold How to custom to enable

forms define DSL

What happen after cmd: rails generator

C:\Ruby193\lib\ruby\gems\1.9.1\gems\railties-3.2.9\bin\rails;

What happen after cmd: rails generator, cont.

Real generate command source code

Scaffold generate source code

Resource generate source code

Model generate source code

Where is ‘hook_for’ lives?

http://rubydoc.info/gems/railties/Rails/Generators/Base.hook_for

Where are we, do we lost?

Read the Rails Guide!

And Stack Overflow…

And Rails Casts……

Author: Eric Guo <eric.guo@sandisk.com>#mailto:eric.guo@sandisk.comAuthor date: 5 months ago (Tue May 29 23:40:35 2012)Commit date: 5 months ago (Thu May 31 16:01:54 2012)Commit hash:864bc83859acbf07493b7cd39a134927c2925e2e

Introduce generate style programming for model and formsReview and change scaffold template

Contained in branches: master, rc8Contained in tags: oracle_production_run_here, oracle_run_here

Or just Google it…

Or Bing?

Change template and command line

Then make all code to together and clean

Or just fork the code in Github

+----------------------+-------+-------+---------+---------+-----+-------+| Name | Lines | LOC | Classes | Methods | M/C | LOC/M |+----------------------+-------+-------+---------+---------+-----+-------+| Controllers | 74 | 65 | 3 | 8 | 2 | 6 || Helpers | 39 | 35 | 0 | 4 | 0 | 6 || Models | 61 | 50 | 4 | 3 | 0 | 14 || Libraries | 104 | 77 | 0 | 7 | 0 | 9 || Integration tests | 0 | 0 | 0 | 0 | 0 | 0 || Functional tests | 8 | 7 | 1 | 0 | 0 | 0 || Unit tests | 11 | 6 | 2 | 0 | 0 | 0 |+----------------------+-------+-------+---------+---------+-----+-------+| Total | 297 | 240 | 10 | 22 | 2 | 8 |+----------------------+-------+-------+---------+---------+-----+-------+ Code LOC: 227 Test LOC: 13 Code to Test Ratio: 1:0.1

https://github.com/Eric-Guo/pl-form

Final after generated forms LOC

+----------------------+-------+-------+---------+---------+-----+-------+| Name | Lines | LOC | Classes | Methods | M/C | LOC/M |+----------------------+-------+-------+---------+---------+-----+-------+| Controllers | 18459 | 13622 | 181 | 1254 | 6 | 8 || Helpers | 39 | 35 | 0 | 4 | 0 | 6 || Models | 1649 | 1458 | 205 | 137 | 0 | 8 || Libraries | 104 | 77 | 0 | 7 | 0 | 9 || Integration tests | 0 | 0 | 0 | 0 | 0 | 0 || Functional tests | 8 | 7 | 1 | 0 | 0 | 0 || Unit tests | 11 | 6 | 2 | 0 | 0 | 0 |+----------------------+-------+-------+---------+---------+-----+-------+| Total | 20270 | 15205 | 389 | 1402 | 3 | 8 |+----------------------+-------+-------+---------+---------+-----+-------+ Code LOC: 15192 Test LOC: 13 Code to Test Ratio: 1:0.0

https://github.com/Eric-Guo/pl-form

Reporting Export as Excel

Excel can open many format

UTF8 CSV

UTF16 CSV

2003 XLS

2007 XLSX

CSV with BOM or no BOM

Rails can generate all of them

But correct only: CSV UTF8 with BOM

Some time, 20 lines takes 3 hours to write.

Some time, 20 lines only takes 20 seconds

Interoperation

Live with .NET and Oracle

tech stack based on

RabbitMQ

WebService, RestfulAPI, RabbitMQ, DB, FTP

Web Service RestfulAPI RabbitMQ Database FTP/SFTP

.NET Excellent Fair Good Fair Fair

Rails Poor Excellent Good On MVC only Fair

Ubuntu Dominate linux distrobution

now appears

Time to thinking about migrate to Linux

Windows market share in Server OS Windows market share in Mobile OS

From http://news.netcraft.com/archives/2012/

3 Steps to Linux

•Development and edit on Windows.

• Prefer as long as it works

•Development on Linux and edit in windows.

• Sublime Text with FTPSync

•Development and edit file in Linux only

• From OS on USB Disk to SSD