Welcome!

Agile Computing Authors: Alois Mayr, Cloud Best Practices Network, Scott Allen, Jonathan Fries, Tim Hinds

Related Topics: Agile Computing, Java IoT, Adobe Flex, Open Source Cloud, Eclipse, Ruby-On-Rails

Agile Computing: Article

Java Kicks Ruby on Rails in the Butt

This article demonstrates that Java is more productive than Ruby

This article tries to demonstrate that Java can be more productive than Ruby. We are going to develop the same application of the article Rolling with Ruby on Rails Revisited (part 1 [1] and part 2 [2]) but using POJO [3]s annotated with JPA [4] and a Model Driven Framework, OpenXava [5] in this case. The result is that with less code, and less time you obtain a more powerful application.

Ruby and rails: The regressive framework

Ruby on rails [6] is so elegant, so easy, so productive. I cannot avoid read and heard continuously these comments. For example, the article Rolling with Ruby on Rails Revisited of Bill Walton says:

What would you think if I told you that you can develop a web application at least ten times faster with Rails than you can with a typical Java framework?”

Oops! Ten times faster!

Well, after these comments I decided to learn Ruby on Rails. I need to know the true key of the productivity and programmer happiness.

After have a taste of RnR I found it a very classic framework, with old techniques:

  • Ruby is a dynamically typed [7] language, as Smalltalk [8]. I prefer statically typed [9] languages.

  • Scaffolding is passive code generation, as IDE wizards or AppFuse [10]. I prefer active code generation [11], or even better, no code generation at all.

  • Relational database centric: the code generators and ActiveRecord promote think first in tables after in classes. I prefer a more pure OO, as Hibernate [12], JPA [4] or even ODBMS [13].

  • MVC [14]: I'm looking for something newer and better that an old MVC framework.

The Java problem: Java developers

The productivity in Java world is a cultural problem, not a technical one. That is this is not a Java fault, it's our fault, we, the Java developers, need to design very beautiful architectures, to apply everywhere the GoF [15] patterns, to do everything reusable, to put 3 tiers in all our systems and to use web services [16] for all. We are not looking for simplicity, therefore we have not found it. But, Java is a very elegant language that allows simpler approach to software development.

Java productivity: The other way

A way for productivity is to use a Model Driven approach. That is, develop the model part, and only the model part, of our application, and to use a framework to produce all the application from it. MDA [17], OpenXava [5], Trails [18], NakedObjects [19], RomaFramework [20] and JMatter [21] are examples of this approach.

The goal

This is the main screen of the wanted application:

Basically, the app's supposed to do three things:

  • Display a list of all recipes.

  • Create new recipes and edit existing recipes.

  • Assign a recipe to a category (like "dessert" or "soup").

The Ruby on Rails first sprint

The first step using RnR is creating the new project, from command line you have to write:

$ rails cookbook2 

Now you must create and configure your database.

Then it's the time for writing your first code, in this case SQL code:

drop table if exists recipes;
drop table if exists categories;
create table categories (
id int not null auto_increment,
name varchar(100) not null default '',
primary key(id)
) engine=InnoDB;

create table recipes (
id int not null auto_increment,
category_id int not null,
title varchar(100) not null default '',
description varchar(255) null,
date date null,
instructions text null,
constraint fk_recipes_categories foreign key
(category_id) references categories(id),
primary key(id)
) engine=InnoDB;

Obviously you have to execute these sentences against your database.

And the final step is generate the Ruby code, you only need execute the next command in the shell of your O.S:

$ ruby script\generate scaffold recipe recipe
$ ruby script\generate scaffold category category

Yes. You have the very first version of your RnR application ready to run.

Yes, very little work, a simple “create table”, and executing a wizard. Let's see the result.

The Rails result

This is the resulting application:

New category entry page

New category added!

New recepy entry page

Little work. Little result.

The JPA on OX first sprint

Go on using OpenXava [5]. The first step using OpenXava is creating the new project:

$ ant CreateNewProject.xml -Dproject=CookBook 

Now you must create and configure your database.

Then it's the time for writing your first code, in this case Java code:

Recipe.java:

package org.openxava.cookbook.model;

import java.util.*;
import javax.persistence.*;
import org.openxava.annotations.*;

@Entity
@View(members="title; description; date; instructions")
public class Recipe {

@Id @GeneratedValue @Hidden
private Integer id;

@Required @Column(length=100)
private String title;

@Column(length=255)
private String description;

private Date date;

@Stereotype("HTML_TEXT")
private String instructions;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getDescription() {
return description;
}

public void setDescription(String description) {
this.description = description;
}

public Date getDate() {
return date;
}

public void setDate(Date date) {
this.date = date;
}

public String getInstructions() {
return instructions;
}

public void setInstructions(String instructions) {
this.instructions = instructions;
}

}

Category.java:

package org.openxava.cookbook.model;

import java.util.*;

import javax.persistence.*;

import org.openxava.annotations.*;

@Entity
public class Category {

@Id @GeneratedValue @Hidden
private Integer id;

@Required @Column(length=100)
private String name;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

}

And the final step is to generate the dababase schema, you only need to execute the next ant target from your project:

$ ant updateSchema

Yes. You have the very first version of your OpenXava application ready to run.

Yes, very little work, a simple POJOs, and executing 'updateSchema'. Let's see the result.

The OpenXava result

This is the resulting application:

 List Mode

 Detail mode

Note that the user can create,update, delete, generate PDF from list, export the list to excel, order by each column, paging with support for large resultsets and filter data. Moreover you can deploy directly, with no code, only executing an ant target, your application in a JSR-168 [22] portal, and the look & feel of the OpenXava portlet adapts to the look & feel of the portal.

This is, from first time, an application ready for production.

Little work, polished result.

From a philosophical point of view the difference here between RnR and OX is that in RnR you write first the tables and in OpenXava you write first the classes.

The controllers

Rails has generated for you the controller logic for the basic CRUD, you can see it here:

RnR controller

In the other hand OX has not generated any code for CRUD, OpenXava just have a generic code for doing CRUD and Printing, and it is assigned automatically to all entities. You can write your own generic CRUD logic, or you can write a specific logic for a particular entity, but you haven't a controller code for each entity. In this way, you have less code to maintain, and you can change the logic of all CRUD modules touching in a single place.

That is for controllers Rails uses generated code while OX uses generic code.

You can learn more about OX controllers in OpenXava wiki [23].

Adding a relationship

For adding a relationship from category to recipe in Ruby you have to write the next code in category.rb:

Rnr relationship category to recipe

and this one in recipe.rb:

Rnr relationship recipe to category

Yes, pretty simple. But, you have more work to do. You must edit cookbook2\app\views\recipe\_form.rhtml and add the next code:

<p><label
for="recipe_category_id">Category</label><br/>
<%= select("recipe", "category_id", Category.find(:all).collect
{|c| [c.name, c.id] }) %></p>

The result is:

Rnr recipe with category

For its part, in OpenXava you have to define the relationship using JPA in Category.java:

@ManyToOne(optional=false) @DescriptionsList
private Category category;

and in Recipe.java:

 @OneToMany(mappedBy="category")
private Collection<Recipe> recipes;

And you do not need to touch any HTML-like code. You application will show just this:

OpenXava Recipe with Category

You have a link for modifying or creating new categories from here.

Without adding any additional code if the user go to the Category module he will obtain a collection of Recipes in each Category, as following:

OpenXava Category with recipes

In this point the RnR application still does not have this features, you need to write some Ruby and HTML to code to obtain the same effect.

The main difference here between RnR and OX here is that in OX you do not write any HTML-like code, indeed you do not write User Interface code at all.

Calculating a initial value

The next step in the Ruby on Rails tutorial is to generated a initial value for a property. In RnR you have to edit the controller code in order to achieve it. Let's see it:

You modify the new and update method adding the line:

@recipe.date = Time.now

The equivalent in OX is adding the @DefaultValueCalculator annotation in model:

@DefaultValueCalculator(CurrentDateCalculator.class)
private Date date;

You obtain the same effect in a more declarative way.

That, while in RnR you put the code on controller, in OX the code for calculating initial values, for validations and for business logic in general is on the model. OX promotes moving business logic from controller to model.

As curiosity, in the RnR article says: “I modified the model files so I need to restart our web server.” While using Eclipse WTP I only need to press Ctrl – B, and click on refresh in my browser in order to see the change of my model in my OpenXava application.

Conclusion

The main difference between Ruby on Rails and OpenXava is that RnR is a MVC framework, you have to write the model, the view and the controllers, and OX is a model-driven framework, you only need to write the model. The result is less code for a better application.

Another big difference is that RnR uses passive code generation; that is, it generates the code for you, but after it if you want to extend or refine the code you have to edit the generated code. OpenXava does not use code generation, the only code you have is the code you write.

You can find productivity inside the Java universe.

References

 

Links

[1] http://www.onlamp.com/pub/a/onlamp/2006/12/14/revisiting-ruby-on-rails-r...
[2] http://www.onlamp.com/pub/a/onlamp/2007/01/05/revisiting-ruby-on-rails-r...
[3] http://en.wikipedia.org/wiki/Plain_Old_Java_Object
[4] http://en.wikipedia.org/wiki/Java_Persistence_API
[5] http://www.openxava.org/
[6] http://www.rubyonrails.org/
[7] http://en.wikipedia.org/wiki/Dynamically_typed_language#Dynamic_typing
[8] http://en.wikipedia.org/wiki/Smalltalk
[9] http://en.wikipedia.org/wiki/Type_system#Static_typing
[10] http://en.wikipedia.org/wiki/AppFuse
[11] http://c2.com/cgi-bin/wiki?ActiveCodeGeneration
[12] http://www.hibernate.org
[13] http://en.wikipedia.org/wiki/ODBMS
[14] http://en.wikipedia.org/wiki/Model-view-controller
[15] http://en.wikipedia.org/wiki/Design_Patterns
[16] http://en.wikipedia.org/wiki/Web_services
[17] http://www.omg.org/mda/
[18] http://www.trailsframework.org/
[19] http://www.nakedobjects.org/
[20] http://romaframework.xwiki.org
[21] http://jmatter.org/
[22] http://jcp.org/en/jsr/detail?id=168
[23] http://openxava.wikispaces.com/controllers_en
[24] http://java.dzone.com/sites/all/files/rails-vs-ox010.jpg
[25] http://java.dzone.com/sites/all/files/rails-vs-ox020.jpg
[26] http://java.dzone.com/sites/all/files/rails-vs-ox030.jpg
[27] http://java.dzone.com/sites/all/files/rails-vs-ox040.jpg

More Stories By Javier Paniza

Javier Paniza is the project lead for OpenXava project. He works as software developer at Gestión 400, a software company for public administration in Spain. He has been developing with Java Enterprise since 1998. Also he has been J2EE mentor for development teams in banking projects.

@ThingsExpo Stories
What a difference a year makes. Organizations aren’t just talking about IoT possibilities, it is now baked into their core business strategy. With IoT, billions of devices generating data from different companies on different networks around the globe need to interact. From efficiency to better customer insights to completely new business models, IoT will turn traditional business models upside down. In the new customer-centric age, the key to success is delivering critical services and apps wit...
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo 2016 in New York and Silicon Valley. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be! Internet of @ThingsExpo, taking place Nov 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 17th Cloud Expo and will feature technical sessions from a rock star conference faculty ...
The essence of data analysis involves setting up data pipelines that consist of several operations that are chained together – starting from data collection, data quality checks, data integration, data analysis and data visualization (including the setting up of interaction paths in that visualization). In our opinion, the challenges stem from the technology diversity at each stage of the data pipeline as well as the lack of process around the analysis.
The 19th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Containers, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportunity. Submit y...
SYS-CON Events announced today that ContentMX, the marketing technology and services company with a singular mission to increase engagement and drive more conversations for enterprise, channel and SMB technology marketers, has been named “Sponsor & Exhibitor Lounge Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York City, New York. “CloudExpo is a great opportunity to start a conversation with new prospects, but what happens after the...
Internet of @ThingsExpo, taking place November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with the 19th International Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world and ThingsExpo New York Call for Papers is now open.
In his keynote at 18th Cloud Expo, Andrew Keys, Co-Founder of ConsenSys Enterprise, will provide an overview of the evolution of the Internet and the Database and the future of their combination – the Blockchain. Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life ...
There are several IoTs: the Industrial Internet, Consumer Wearables, Wearables and Healthcare, Supply Chains, and the movement toward Smart Grids, Cities, Regions, and Nations. There are competing communications standards every step of the way, a bewildering array of sensors and devices, and an entire world of competing data analytics platforms. To some this appears to be chaos. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists will discuss the vast to...
SYS-CON Events announced today that Enzu, a leading provider of cloud hosting solutions, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Enzu’s mission is to be the leading provider of enterprise cloud solutions worldwide. Enzu enables online businesses to use its IT infrastructure to their competitive advantage. By offering a suite of proven hosting and management services, Enzu wants companies to foc...
Customer experience has become a competitive differentiator for companies, and it’s imperative that brands seamlessly connect the customer journey across all platforms. With the continued explosion of IoT, join us for a look at how to build a winning digital foundation in the connected era – today and in the future. In his session at @ThingsExpo, Chris Nguyen, Group Product Marketing Manager at Adobe, will discuss how to successfully leverage mobile, rapidly deploy content, capture real-time d...
A strange thing is happening along the way to the Internet of Things, namely far too many devices to work with and manage. It has become clear that we'll need much higher efficiency user experiences that can allow us to more easily and scalably work with the thousands of devices that will soon be in each of our lives. Enter the conversational interface revolution, combining bots we can literally talk with, gesture to, and even direct with our thoughts, with embedded artificial intelligence, wh...
IoT generates lots of temporal data. But how do you unlock its value? How do you coordinate the diverse moving parts that must come together when developing your IoT product? What are the key challenges addressed by Data as a Service? How does cloud computing underlie and connect the notions of Digital and DevOps What is the impact of the API economy? What is the business imperative for Cognitive Computing? Get all these questions and hundreds more like them answered at the 18th Cloud Expo...
SYS-CON Events announced today that 24Notion has been named “Bronze Sponsor” of SYS-CON's 18th Cloud Expo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. 24Notion is full-service global creative digital marketing, technology and lifestyle agency that combines strategic ideas with customized tactical execution. With a broad understand of the art of traditional marketing, new media, communications and social influence, 24Notion uniquely understands how to con...
Whether your IoT service is connecting cars, homes, appliances, wearable, cameras or other devices, one question hangs in the balance – how do you actually make money from this service? The ability to turn your IoT service into profit requires the ability to create a monetization strategy that is flexible, scalable and working for you in real-time. It must be a transparent, smoothly implemented strategy that all stakeholders – from customers to the board – will be able to understand and comprehe...
The demand for organizations to expand their infrastructure to multiple IT environments like the cloud, on-premise, mobile, bring your own device (BYOD) and the Internet of Things (IoT) continues to grow. As this hybrid infrastructure increases, the challenge to monitor the security of these systems increases in volume and complexity. In his session at 18th Cloud Expo, Stephen Coty, Chief Security Evangelist at Alert Logic, will show how properly configured and managed security architecture can...
When it comes to IoT in the enterprise, namely the commercial building and hospitality markets, a benefit not getting the attention it deserves is energy efficiency, and IoT's direct impact on a cleaner, greener environment when installed in smart buildings. Until now clean technology was offered piecemeal and led with point solutions that require significant systems integration to orchestrate and deploy. There didn't exist a 'top down' approach that can manage and monitor the way a Smart Buildi...
WebRTC is bringing significant change to the communications landscape that will bridge the worlds of web and telephony, making the Internet the new standard for communications. Cloud9 took the road less traveled and used WebRTC to create a downloadable enterprise-grade communications platform that is changing the communication dynamic in the financial sector. In his session at @ThingsExpo, Leo Papadopoulos, CTO of Cloud9, will discuss the importance of WebRTC and how it enables companies to fo...
SYS-CON Events announced today TechTarget has been named “Media Sponsor” of SYS-CON's 18th International Cloud Expo, which will take place on June 7–9, 2016, at the Javits Center in New York City, NY, and the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. TechTarget is the Web’s leading destination for serious technology buyers researching and making enterprise technology decisions. Its extensive global networ...
Korean Broadcasting System (KBS) will feature the upcoming 18th Cloud Expo | @ThingsExpo in a New York news documentary about the "New IT for the Future." The documentary will cover how big companies are transmitting or adopting the new IT for the future and will be filmed on the expo floor between June 7-June 9, 2016, at the Javits Center in New York City, New York. KBS has long been a leader in the development of the broadcasting culture of Korea. As the key public service broadcaster of Korea...
The idea of comparing data in motion (at the sensor level) to data at rest (in a Big Data server warehouse) with predictive analytics in the cloud is very appealing to the industrial IoT sector. The problem Big Data vendors have, however, is access to that data in motion at the sensor location. In his session at @ThingsExpo, Scott Allen, CMO of FreeWave, will discuss how as IoT is increasingly adopted by industrial markets, there is going to be an increased demand for sensor data from the outer...