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Useful Phrases: Software and cathedrals

Software and cathedrals are much alike. First we build it, then pray.

- Anonymous

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Phrases: Programming

"Programs must be written for people to read and only incidentally for machines to execute them."

--- Abelson / Sussman


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Manage your projects easily with

Sailing around I found Scrumy a tool to organize and manage the tasks to be performed on a project with all Scrum style.

There is not much to say I leave the link of the site, which lets you create projects for free in their own way FREE or you can pay a bit to access all the features in the way PRO: Scrumy!



Here is a video that explains what Scrumy:

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Scrumy Need icons for your web?

Hello everyone.

Whenever we develop a system comes to choosing what
icon used. If you're new and have no ideas
licenses that may have the images circulating on the web, I must say
you can not come and take the icons you want ...

Except Wikimedia Commons where you'll find an impressive amount of images (PNG and SVG) and icons licensed under the GNU General Public License "better known as" GNU GPL "or" GPL. "

For more information visit the following links:
GNU GPL (Wiki)
GNU GPL (official website)

Greetings .-

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Phrases: Projects

"If you want to start and develop something great, you do not need millions of dollars of capitalization. You need enough pizza and Diet Coke in the refrigerator, a cheap PC and work and dedication to make your idea. " ---

John Carmack


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SCRUM How would you apply?

We mentioned on the agile development methodology SCRUM allows, among other things, involve the customer throughout the development process as well constantly motivate the team through brief daily meetings. All equipment is fully aware at what point in development is the project and what needs to be done.



SCRUM How would you apply? Here is an example or template of how you might bring to apply:

Stage 1: Making requirements.
Definition of "Product Backlog", which corresponds to all tasks, requirements or functions to be performed. This information will be gathered through meetings between the "Scrum Team and Product Owner.

Stage 2: Requirements Analysis and Design Architecture.
will analyze the "Product Backlog" and through it will generate the design for the system, involving for example, model database, major system modules.

Stage 3: System Development.
Throughout the development process, the team held daily meetings of 15 to 30 minutes, called "Daily Scrum Meeting." The aim of these is that the whole team is aware of the status of various tasks and resolve questions that may arise in this process.

Through "Sprint Planning Meeting" will define the "Sprint Backlog" (set of requirements equivalent to an increase in the system), which contemplate some of the features described in the Product Backlog. " The "sprint backlogs" ideal will last 2 weeks.

This phase generates a document stating the objectives of the "Sprint" called "Sprint Goal."

Once a "Sprint Backlog", will be a meeting called "Sprint Review" which will show the "Product Owner" progress. This delivery may review and make any observations.

Finally, start the "Sprint Retrospective." Where are marked positive (to repeat) and the negative aspects (Not repeated) experienced in the "Spring Backlog."

The cycle is repeated to cover all the functionalities described in the Product Backlog. "

Stage 4: Acceptance and delivery of the Product.
foresees the following tasks: Review

• final product.


• 
  Delivery System.
  
  
  
  Source
  
  • Architectural Design Document System Manuals
  
  
  • System management and use
  
  
  
  


• Installation System in production environment

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SCRUM: Software Development Methodology

Roughly one can say that Scrum is an Agile software development focuses on how team members should work (communicate, work, etc. ), to produce a flexible system in a constantly changing environment.

SCRUM's philosophy is to involve, motivate and keep constantly informed about the status of the project to the team and the client.




is a methodology that, to do it, requires a lot of responsibility on the part of the team work. Which consists of a project manager, development team and the client.

Today many companies are adopting this methodology due to its easy implementation and adaptability to change.
is so simple that the most likely (if they have participated in projects at work, university or institute) have tackled a project in a very similar (later publish an "example of how you might implement SCRUM).

below define the roles and concepts of SCRUM.

Roles: Product

• Owner: Understand project priorities brand or product (customer). Scrum


• Master Guide meetings and helps the team to any problems that may arise (Project Manager).


• Scrum Team: They are responsible for implementing the functions or requirements chosen by the Product Owner. Develop the product.


• Stackeholders: People associated with the product or its funding. Participate in the Sprint Review and can provide ideas, suggestions or needs.


• Users: They are the ultimate beneficiaries of the product.

Main activities:

• Product Backlog: Stack requirements or system functions, defined and prioritized by the Product Owner.


• Sprint Backlog: Pile of functionality to develop during an iteration or sprint extracted from the Product Backlog. These developments are advised not to exceed four weeks, thus maintaining control of the project.


• Spring Planning Meeting: Meetings between the Scrum Master, Product Owner and Scrum Team and is planning tasks to be performed in a number of Sprint backlogs. It generates a document stating the objectives of Sprint Sprint called Goal.


• Daily Scrum Meeting: Small meetings between the Scrum Master and Scrum Team, which must not exceed 30 minutes. Performed during the development of Spring Backlog and is to report the status of it, answering the following questions:
  
  
  
  • What tasks have you done since the last meeting? (Which I did).
  
  
  • On what tasks will work on the current day? (I'll do today.)
  
  
  • What obstacles or risks impede or prevent the normal progression? (What help I need).
  
  
  
  


• Sprint Review: Meeting of no more than two hours, which reports the progress made in the Sprint the Product Owner and Stackeholders.


• Sprint Retrospective: Activity for reorganizing the work of the Product Backlog. We analyze positive and negative aspects of the Sprint Backlog.

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Phrases: Software Design

"A lot of software today, looks like an Egyptian pyramid, with millions of bricks piled on top of another, without structural integrity and made by pure brute force and thousands of slaves."

- Alan Kay


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basic data types

As we mentioned in the first post python, this is a dynamically typed language but also strongly typed.

In python we have the following basic types: Boolean

• Numbers (integers, decimals and complex) chains
Text

Syntax to declare boolean: = True
algoVerdadero

algoFalso = False Syntax to declare

numbers:

 # So to declare variables numeroPositivo 
 integer = 10 = -15 
 numeroNegativo 
 
 # A float variable 
 numeroFloat = 2.0254 
 

numeric operators:

 a = 5.0 b = 3.0 
 
 print (a + b) # print -> 8.0 
 print (ab) # print -> 2.0 
 
 print (a * b) # print -> 15.0 
 print ( b ** b) # print -> 9.0, representing 3.0 ^ 3.0 (power) 
 
 print (a / 5) # print -> print 
 1.6666 (a / / 5) # print -> 1, is the integer result 
 print division (a% 5) # print -> 2, is the rest of the division 
 

Syntax to declare strings

 a = "Hello" 
 b = "World" 
 print (a + b ) # print "Hello World" 
 print (a + (b * 2)) # print "Hello World World 
 

If you want to begin to develop in Python THIS LINK you will find information about the interpreter and IDEs.

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Python IDEs for Python programming


In the previous post (Click Here ) saw a small brush on Python and some of its concepts. However

What development tools can take to program in Python? Starting


with the basics when you install the python interpreter , it comes with an integrated graphical IDE called IDLE .

Now if we want something more sophisticated and free, we have our dear friend Eclipse IDE which should complement installing the plugin PyDev . With this we will have syntax highlighting, autocomplete code refactoring, highlight errors, etc.
Others are free IDE: BOA Constructor and Eric .

I personally use Eclipse + PyDev and works very well.

If you have questions about how to configure Eclipse to program in Python, comment it and I'll help. Greetings .-

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Phrases: Programming Things that happen

"Any fool can write code that a computer understands. Good programmers write code that humans can understand."

- Martin Fowler


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For those who work more than one this story will seem familiar.



And to you in your workplace, something similar has happened to you?

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A first look at photos

Hi all,

some time ago that I have wanted to learn to use the Python programming language (more details HERE Python) ...

What is Python?

is an interpreted language or script (unlike Java is compiled), that is an intermediate program (called "shell") is responsible for reading and executing the code on the machine.



has dynamic typing, ie the type of variables are determined at runtime.

Despite this, it is strongly typed, meaning that you can not treat a variable as being of a different kind that is.

is also OO (it also supports imperative programming , Functional and Aspect Oriented ) and top it multiplatform. The Python interpreter is available for: Linux, Windows, Mac OS, etc. So if not used libraries or APIs that use the platform-specific routines (SO) code written in Python Shall run on these systems without hardly any change. Later

basic exercises begin to rise so that together we learn to use this simple and powerful programming language. As a sneak preview

I leave the full code required to write the typical Hello World:

 print ("Hello World") 
 

If you want to install the python interpreter to begin programming, download the appropriate platform to you use this link: Download PYTHON

Greetings .-

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Python creators of programming languages \u200b\u200bJava varargs

Here is the link where you can see photos of the creators of some programming languages \u200b\u200blike java, python, c #, php and more ... Click HERE



What do you think the creators of your favorite programming language? Greetings .-

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for-each loops and

Since Java 5 concepts were incorporated varargs (variable arguments) and loops for-each .

The first allows us to pass a variable number of arguments to a method in a transparent manner. The second gives us on way how loops are made.

Both features give us the same dynamism provided by other languages \u200b\u200blike Python or PHP.

Here's an example that blends these features
"Most Java programmers write code like this:

 
 public class VarargsForEach {
 public static void main (String [] args) {
 for (int i = 0; i \u0026lt; ; args.lengt; i + +) {String argument = args 
 [i]; 
 System.out.println (argument); 
 
}}} 
 
 

"Now using varargs and for-each loops, our code would be as follows: public class

 
 
 VarargsForEach {public static void main (String. .. args) {
 foreach (String argument: args) {System.out.println 
 ( argument);} 
 
 
 print ("Hello," "As," "these," "...", 1,2,3, "bye"); 
 
 
} public static void print (Object.. . parameters) {
 foreach (Object parameter: parameters) {System.out.println 
 (parameter); 
 
}}} 
 
 

The varargs give us more abstract and flexibility in the methods. On the other hand for-each loops give us simplicity and elegance in code.

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J2EE: Struts 2 + log4j + AJAX (III)

Hi all,

As I was in the previous Post ( post 1, post 2 ), the new version of Struts (Struts 2 ) is very different from its predecessor.

[if first time you see this post I recommend you visit the previous post]

is why I will explain in more detail how it works and set up this framework.
For this I will rely on Struts 2 project posted on the Google Group (file: MVCStruts2.rar).

first thing to do is edit the deployment descriptor (web.xml file) to add the Struts2 filter that allows to run on our project. Shall We
web.xml look like:

 \u0026lt;? Xml version = "1.0" encoding = "UTF-8"?> 
 \u0026lt;web-app xmlns: xsi = "http://www.w3.org / 2001/XMLSchema-instance "xmlns =" \u200b\u200bhttp://java.sun.com/xml/ns/javaee "xmlns: web =" http://java.sun.com/xml/ns/javaee/web-app_2_5 . xsd "xsi: schemaLocation =" http://java.sun.com/xml/ns/javaee  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> 
  
 <display-name>MVCStruts2</display-name> 
 <welcome-file-list> 
 <welcome-file>index.html</welcome-file> 
 </welcome-file-list> 
  
  
 <filter>   
 <filter-name>struts</filter-name>   
 <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>   
 </filter>   
 \u0026lt;filter-mapping> 
 
 \u0026lt;filter-name> struts \u0026lt;/ filter-name> 
 \u0026lt;url-pattern> / * \u0026lt;/ url-pattern> 
 \u0026lt;/ filter-mapping> 
 
 \u0026lt;/ web-app> 
 

In this way the web server (Tomcat in this case) know that any request made to pass through the filter FilterDispatcher, which is the controller nuestas of Web application.

Struts 2 lets you create a xml configuration file, which you can specify what to do our Controller according to the request received by the customer. This file is called struts.xml and package must be created on the default Web Project Resources: src.
The project file can be written as follows:

 \u0026lt;? Xml version = "1.0" encoding = "UTF-8"?> 
 \u0026lt;! DOCTYPE struts PUBLIC "- / / Apache Software Foundation / / DTD Struts Configuration 2.0 / / EN "" http://struts.apache.org/dtds/struts-2.0.dtd "> 
 
 \u0026lt;struts> 
 \u0026lt;include file="login-config.xml" /> 
 \u0026lt;/ struts> 
 

As can be seen almost there is nothing on file content, this is because you are using a xml tag called include , which allows you to import content from other Struts 2 xml configuration files. In this way we avoid that as our application grows, it does at the same rate our archive struts.xml. Now let's see the contents of the login-config.xml (which contains the login action in our application).

 \u0026lt;? Xml version = "1.0" encoding = "UTF-8"?> 
 \u0026lt;! DOCTYPE struts PUBLIC "- / / Apache Software Foundation / / DTD Struts Configuration 2.0 / / EN" "http:// struts.apache.org/dtds/struts-2.0.dtd "> 
   
 <struts> 
 <package name="accesopackage" extends="struts-default"> 
 <action name="login" method="validarUsuario" class="cl.struts2.login.action.LoginAction">   
 <result name="success">/WEB-INF/home/home.jsp</result> 
 <result name="error">/WEB-INF/index.jsp</result> 
 </action> 
  
 <action name="logout" method="cerrarSessionUsuario" class="cl.struts2.login.action.LoginAction"> 
 <result name="success">/WEB-INF/index.jsp</result> 
 \u0026lt;/ action> 
 \u0026lt;/ package> 
 \u0026lt;/ struts> 
 

This file is only telling us to run the class' cl.struts2.login.action.LoginAction 'and method' validarUsuario () 'when you get the' login 'action, and the same class, but the method' cerrarSessionUsuario () 'when you get action' logout '. In stock
login, if the implementation of the method is correct, the action returns SUCCESS, which will lead to the '/ WEB-INF/home/home.jsp', or to otherwise take us ERROR to the home page '/ WEB-INF/index.jsp'.

Now we can create our index.jsp which will make user login and call to action 'login'.

 \u0026lt;% @ page language = "java" contentType = "text / html; charset = ISO-8859-1" 
 pageEncoding = "ISO-8859-1"%> 
 \u0026lt;! DOCTYPE html PUBLIC "- / / W3C / / DTD HTML 4.01 Transitional / / EN "" http://www.w3.org/TR/html4/loose.dtd "> 
 \u0026lt;html> 
 \u0026lt;head> 
 \u0026lt;meta http-equiv = "Content-Type" content = "text / html; charset = ISO-8859-1"> 
 \u0026lt;title> Log On \u0026lt;/ title>  
 <link rel="stylesheet" href="estilos/estilos.css" type="text/css" /> 
 <script type="text/javascript" language="javascript"> 
 function validar(){ 
 var user = document.form.username.value; 
 var pass = document.form.password.value; 
 if( user!=null && pass!=null ){ 
 document.form.submit(); 
 } 
 else{ 
 alert("Ingrese usuario y contraseña"); 
 } 
 } 
 </script> 
  
 </head> 
 <body> 
 <form method="post" name="form" action="login"> \u0026lt;table 
 class="tabla"> 
 \u0026lt;tr> 
 \u0026lt;td align="center" colspan="2" class="franja-titulo"> 
 
 System Login \u0026lt;/ td> 
 \u0026lt;/ tr> \u0026lt;td class="texto"> 
 
 \u0026lt;tr> 
 User: 
 \u0026lt;/ td> 
 \u0026lt;td> 
 \u0026lt;input type = "text" name = "username" id = "username" class = "field" text "> 
 \u0026lt;/ td> 
 \u0026lt;/ tr> \u0026lt;td class="texto"> 
 
 \u0026lt;tr> 
 Password: 
 \u0026lt;/ td> \u0026lt;input type="password" 
 
 \u0026lt;td> name="password" id="password" class="campo-texto"> 
 \u0026lt;/ td> 
 \u0026lt;/ tr> \u0026lt;td align="center" 
 
 \u0026lt;tr> colspan="2" class="texto-tabla"> 
 \u0026lt;% 
 if (request.getAttribute ("error")! = null) {
%> 
 Failed to validate the data 
 \u0026lt;%} 
 
%> 
 \u0026lt;/ td> 
 \u0026lt;/ tr> 
 \u0026lt;tr> \u0026lt;td Align="center" colspan="2"> 
 
 \u0026lt;input type="button" value="Aceptar" onclick="validar();"> 
 \u0026lt;/ td> 
 \u0026lt;/ tr> 
 \u0026lt;/ table> 
 \u0026lt;/ form> 
 \u0026lt;/ body> 
 \u0026lt;/ html> 
 

As you can see in the image, the web form index.jsp redirect to action login '.
So let's see the code for our class 'cl.struts2.login.action.LoginAction'.

 loginAction public class extends implements ActionSupport ServletRequestAware, ServletResponseAware { 
 
 private static final long serialVersionUID = 1L; 
 
 Logger logger = Logger.getLogger private (LoginAction.class) 
 
 private HttpServletRequest request; 
 private HttpServletResponse response; 
 validarUsuario 
 
 public String () {
 if (SessionUtil. existeSession (request, SessionUtil.SESSION_USUARIO)) {
 logger.debug ("[validarUsuario] user already validated"); 
 return SUCCESS;} 
 
 
 String username = request.getParameter ("username") String password = request 
 . getParameter ("password"); 
 
 logger.debug ("[validarUsuario] received parameters: {user =" + username + " password = "+ password +"}"); 
 
 User user = null; 
 
 if (username! = null & & password! = null) {
 logger.debug (" [validarUsuario] are valid user "); 
 User usu = new User (); 
 usu.setUsername (username); 
 usu.setPassword (password); 
 ServicioUsuarios 
 ServicioUsuarios service = new (); 
 user = servicio.obtenerUsuario (usu); 
 
 
} if (user ! = null) {
 logger.debug ("[validarUsuario] proper validation"); 
 SessionUtil.crearSession (request, SessionUtil.SESSION_USUARIO, user, 15); 
 return SUCCESS;} 
 
 
 SessionUtil.cerrarSession (request); 
 request.setAttribute ("error", "1"); 
 logger.debug ("[validarUsuario] error when validating user"); 
 return ERROR;} 
 
 
 
 
 cerrarSessionUsuario public String () {
 logger.debug ("[cerrarSessionUsuario] Close user session"); 
 SessionUtil.cerrarSession (request); 
 return SUCCESS;} 
 
 
 
 getServletRequest public HttpServletRequest () {return 
 this.request; 
} 
 
 getServletResponse public HttpServletResponse () {return 
 this.response; 
} public void 
 
 setServletResponse (HttpServletResponse response) {
 this.response = response; 
} public void 
 
 
 setServletRequest (HttpServletRequest request) {
 this.request = request; 
}} 
 
 
 

The code can see the class and method loginAction validarUsuario () , which will run under the 'login' action. I will not explain in detail the contents of this method (as with the previously published material ought not have trouble understanding this;)), but it is understood that somehow validates the user's username and password. If the validation is successful the action returns SUCCESS, otherwise ERROR (if you doubt this becomes to see the photo of the login-config.xml file).

will detail later how the interceptor and how to run the AJAX calls. Atento

their doubts. Greetings .-

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Phrases: Software Design

"There are two ways of designing software: the first is to make it so simple that there are obviously no deficiencies and the second is make it so complicated that there are no obvious deficiencies. The first way is much more difficult. "

- CAR Hoare


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J2EE: Strus2 + log4j + AJAX (II)

In previous post showed the various frameworks used to develop a Web project Java, which can be downloaded from the Google Group (file: MVCStruts2.rar).

I will explain the project's architecture and what is the function of each one of the components thereof.
In this picture we see the architectural design of the system.

This image shows how the architectural division of the application clearly shows how to apply the MVC pattern. Also Unveils flow and how they communicate the different components participate in the system.

Here are defined the different types of classes that constitute the system:

HTML and JSP: Basically Web pages are displayed graphically to the user system. Users to perform functions on Web pages (view layer) generate events, which are captured by the Controller .

Controller: is the intermediary between the view layer and the layer model, gets the events held by the user in the View layer and performs the action ( ActionClases ) for the model, which respond to a request by the customer. The controller is consisting of XML configuration files (struts.xml) that are interpreted by the framwork Struts2.

InterceptorClases: are classes that inherit from the Interceptor interface that provides the Struts2 framework. Its function is to intercept the invocations performed on the view layer to invoke the driver ActionClases (and vice versa) during this break these classes can perform validations (ie validating user session, etc.). and if it is correct flow or action is performed normally.

ActionClases: inherit ActionSupport class provided by the Struts2 framework. Its function (in this project) is to validate the integrity of the received data and invoke the various Services which will provide the information necessary to return the required response by the View layer.

Services: are business classes, which can get data through the invocation of various ClasesDAO , process and return the information requested by the Web tier.

ClasesDAO: These classes access "directly" to various data sources (databases, text files).

ClasesTO: These classes provide transfer objects, which "travel" through the application. For example, a DAO consult a data source and return a list of objects TO.

ClasesUtil: are classes that provide utility functions that may be used by all components of the system.

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J2EE: Strus2 + log4j + AJAX

Hi all,

few days ago I became interested in learning how to use Struts2 , the new version of
web development framework for Java Apache Struts. I was impressed by how different is it compared to his predecessor, to develop research discovered that were not based on
Struts 1.x , but in another framework called WebWork .

The Struts 2 framework based on MVC pattern . Struts 2 can be downloaded from this link HERE .

On the other hand we log4j , also developed by the Apache Foundation. This framework allows to define the output messages in the application at runtime (very useful and implemented in several languages \u200b\u200band organizations). This can be downloaded from this link HERE .

Finally, the project uses AJAX to "facilitate" the implementation and abstract management AJAX call status and compatibility with browsers is that they used the framework PrototypeJS .

precursor that I must learn by doing.
's why I uploaded to Google Group (file: MVCStruts2.rar) a Java web project done on the Eclipse IDE with a practical example using all the tools listed above. This way everyone will have a knowledge base to start any project.

This Web project running on Tomcat 6.x and as the title of the post, use log4j , ajax (framework PrototypeJS) and Struts2 .

Any questions or concerns may make it available right here, in any case later publish more information and details on how the technologies mentioned.

Ah! here I leave photos of how they see the project pages.

To acclimate the project aims to have installed the Java virtual machine (JDK ) Eclipse IDE and Tomcat 6.x .

When running the project on your computer remember edit
environment variables that are defined in the web.xml file.

The test user of the application is: user = egacl; pass = turd.
This information can be edited (or add more users)
in the users.txt file, which you will find within the project.

In THIS LINK you will find the project [filename = MVCStruts2.rar].

Any questions or see you posting here.