Thursday, July 7, 2011

Ruby Pair Programming

As we all know, Learning Ruby is fun, i just want to use this post to share my experience in Ruby pair programming. Initially i don't have any idea on pair programming and after i learnt i found that, this is one type of writing unit testing in Java. Also, its just like the approach of Test Driven Development, that is what i understood.

Writing tests and writing code based on that test and checking every time the test are passed whenever we do modifications... that is what finally pair programming is.. so what will be the advantage? New modifications in the code should not break the existing functionality as iteration is the important aspect in software development.

Our mentor Victor Goff teach this concept to me like how a father can teach to his kid... i really admired of his teaching skill and its my duty to say special thanks to him as this post is mainly because of his inspiration. I do not know whether i will post all the inputs that he shared with me, but i will try my best to achieve that.

Lets start jump towards the pair programming...

For that we need rubydoctest to be installed. My concentration is mainly towards Windows since for Mac and other OS there needs to me some more settings we need to do for installing that. Mostly these types are installed as gem and hence other OS users can do some google on it to identify the steps for rubydoc installation.

Just install the rubydoctest as below
You can choose the directory where Ruby is installed if it throws any error. I hope it will not throw any error but i am not sure... so try it if you want.

The next step is towards writing the program.
Create a file called hello_world.rb and type the following in it.

Now run the file in the command prompt as below and we will get the following result.The errors and failures are 0 and this is the good startup.
So, whatever doctest we need to write, we have to write it within the comment block = begin and =end

Next we are going to start by writing the first doctest for our program.
For that we just update the lines as below in the hello_world.rb file

when we run the rubydoctest, we will get the following outputSo, we are calling a method called hello_world but its not defined.
In order to correct this error, we can define the method as below.

Now when we again run the rubydoctest, we can see the ouput as belowNow the error becomes 0 but the failure is 1. That means the expected output doesn't match with the result output.
So, we have to think about how to correct it. The expected output is "Hello World!". We will update the code as like below and we will check whether we are able to correct this error or not.

Run the rubydoctest, and check the output which is as shown below.Now there are no errors and failures since the we get the expected output.

This is how the pair programming works and hence it mimimizes the error while coding.

Similar to the above steps, we can add 'n' number of doctest and we can check for the output result.

Whatever steps we learnt above is the basic for running the rubydoctest.
I can show two more iterations from which we can get more comfort with this process.

Iteration 1:

Add the following doctest and run the program.

doctest: I can pass a name to hello_world and get "Hello Mani!"
>> hello_world "Mani"
=> "Hello Mani!"
In order to correct the error, update the method as below:

Now when we run the doctest, we will get the output without errors as like below.So, by passing the arguments to the existing method, we are able to correct the error. Also, note that, the existing doctest is also not failed.

Iteration 2:

In this iteration, we just add one more argument to the method. We will write the doctest as like below.

doctest: I can also ask a question by passing "Erik", "?"
>> hello_world "Erik", "?"
=> "Hello Erik?"

By running the test, the ouput will be as like below.In order to correct the error, we need to modify the method as like below.

And the output after running the doctest will look like this.Now all the tests are passed and your code is working fine without affecting the existing functionality.

This is how the advantage of pair programming stands. We keep on adding the functionalities over by over. At the same time, some care needs to be there to check the existing thing and thats why we are checking all the tests. If any one of the test failed, that means we are doing something wrong and we will be cautious while coding.

If you understand the above concept, surely you will try to go to the next step in that. You can try this Blog post on Ruby Doctest of my mentor which will definitely help you to move little bit further. (I feel little bit hard :( while going through that.. May be because of getting the input directly from him)

Hope all enjoy this post and Happy pair programming until the next post.. :)

Wednesday, July 6, 2011

Journey towards Ruby - Nautical Mile 1

A little bit of distance i reached after i started the journey towards Ruby. I want to mainly focus on the initial startup of few things that i learnt so far.

Very happy to start my week 1 course. This is my first online class that i have attended in my lifetime. Since i don't have any experience, i do have lot of expectations. Also, i heard that there is no screen casts provided from their forum and i thought how they can handle without that.

They have posted week1 lessons. Also, i have bought the online book which the course is based upon. Initially i thought the book is not needed but anyway i have bought that E-book, The ultimate guide to programming which seems to be useful.

There are limited portions that need to be read for the week1. Also, the exercises that are posted in the forum are quite interesting. Quiz is also there. I am more interested in reading about the different people answers for the questions in their own way. Also, challenges have been posted which gives more enthusiasm while participating.
The only thing i feel bad is that, the people who have some knowledge in Ruby start applying that concept while answering the questions leads to some confusion while going in the right path. Anyway the tutors Sathish Talim and Victor Goff guide us during that time by replying to the answer in a nice manner of learning those things in detail in the coming week. This gives some more confident to the people who are little bit new to this.

First, i start struggle to set up the environment and IDE. I am able to install Ruby as i had some experience already on that but i forget the exact tools what i used for IDE. I tried with this Geany IDE. I have downloaded that from here... Download Geany. But i am not feeling comfort with this. I start using SCITE editor. I found this two blog post useful when i start google for the SCITE IDE - Post1 and Post2. The above two post give some idea on SCITE tool and its advantages.

Also i have gone through some other useful books which can give some quick reference. And i found the following book, The Ruby Pocket Reference which is a good reference book in order to see all the usage of syntax and keywords. But the above link has only limited pages and i bought this book from here. I also bought the kindle(thought to write some post related to my experience on this later :)) version of this book, which makes me to read with more eagerness.

I have made some friends through this training program. Still i want to make some more contacts. I started posting some answers for the exercises and i felt good. I thought i reached little bit of distance from where i have started. More experiences on the upcoming posts :)

Friday, June 24, 2011

A journey towards Ruby

Ruby is one of the popular language of this time and i want to make use of this post to share my experience of how i get started with that.

As a Java developer, my full concentration is towards Java based technologies. This mindset gets changed when i start using social media. I came to know that many popular applications like Twitter, BaseCamp, etc are built based on Ruby on Rails platform.
I started analyzing the reason behind that...

Nowadays lot of applications are created based on web. Deploying and hosting the application is one of the major hurdle everyone is facing. In my experience, there are lot of PHP based web applications available in the market. The main reason behind is that, lot of hosting services are supporting PHP. But what happen when we develop applications based on Java. Yes, there are few hosting services that are available to host Java based web apps but the cost is more compared to PHP based hosting services.

One more problem is the deployment. Deploying a Java based applications is not that much easy even though lot of tools are there. The main reason is, we need to set up lot of configuration parameters. Also the time taken for development is more for Java based application. Even for building a small application, we need to set up the required environment which can be set as similar to large enterprise applications. So, Java is mainly suited for large enterprise applications.

What is the alternate for that? PHP - Its more suited for the programmers who know C# Dotnet environment and they can easily picked up and move towards the environment.Also the learning curve is more for any person who want to move towards PHP since it will be easy at the startup. Even i start maintaining the website built on PHP based on my little knowledge. But what will be the alternate for Java developers like me?

Here comes Ruby. Learning Ruby is fun... :) That is what i come across. Learning curve is simple... Hiring the people and getting the people trained is more easy.. Quick development cycle... Easy deployment... what more? For quick launch of small products, Ruby platform is good...

With that in mind, i start studying the Ruby based framework.. Ruby on Rails(ROR).. i started a year before... its like entering in to the struts framework directly without knowing much knowledge in Java. Initially i didn't know about that and have fun reading the entire book, Head First Rails. Quickly did some basic programs... even i start posting blog on that - Setting up Ruby on Rails Environment in Windows and also deploy the sample application in Heroku.. a popular hosting provider for free...

Bit everything stops once i reached a particular stage. Reason is, i do not know about the interior programming language, Ruby. Now i realized and searched for some course and i found the Rubylearning and i enrolled in the course.
I missed the chance of joining it for free what they have provided it for their 25th batch. But anyway i paid it through my company and i joined. The course started and also thus my journey...

The first thing i learnt is Learning Ruby is Fun :) but mastering Ruby is difficult :(

I will post my experiences towards this journey so that the people like me who are coming from other language can get some idea on this.

Thursday, June 23, 2011

Jboss KB Project Validator problem in Jboss Tools with Eclipse 3.5

I just want to put this post in order to express my frustrations towards working with Jboss 3.1 tools with eclipse. We are using Eclipse 3.5 for our development work. Also we are using RichFaces for the front end development. Whenever we tried to do some changes in the JSP files, a progress bar with Jboss KB project validator gets started.
When we made change in less number of files, then the validator only runs for few seconds. If we give full build to the project, then the frustration gets started.. yes.. the system gets entirely hang and it will take around one hour to complete the process.
After analysis i found that, the problem will get fixed in the later versions of Jboss tools. I found the workaround solution from the following thread from the Jboss Community site.
We need to uncheck the Jboss KB Validator option from the menu Windows>Preferences>Validation. We can unselect only for the option box while build leaving the option for manual as it is.
By this way, we are able to do some work around to solve that problem.
Ok.. by the way we are talking about KB problem.. what is that.. its keep on coming to mind whenever that problem occurs... so.. after finding the solution.. i was little bit relaxed.. its nothinng but.. Knowledge Base. Its main purpose is to keep track of the related details about the files which includes content assist, bean configuration, etc...
So, anyway we are now having solution for this problem.

Sunday, May 29, 2011

Technical Conferences in India

Attending technical conference is one of the main area where we can gain & share more knowledge with peers of the same technical community. This is what i understood from various tweets i come across and also heard from various people of my contacts. So i thought to search for various events that take place in India.
I got many results that are occurring mostly in Bangalore and Mumbai. Few of them take place in Chennai too. The following sites helped me to filter some of my desired events which are in my technical area.

I plan to attend the following events that are occurring in Bangalore.

Anyway i missed the following event on Ruby on rails.

Hope to see other upcoming events that are taking place in India.