Soft Cero

Dudas y aportes al desarrollo de software

2/12/13

Movie: Responsive Web (comedy)

I've been reading about Single Page Applications concept. This is a "new and revolutionary" concept, as it pretends to make web applications more responsive for the user.
Now, I'm wondering what is "more responsive".

To answer this, let me go back in the time. I won't go through the History of Programming languages, but I'll go to when the Web Development started.

We started to do "pages" when internet became popular. And the reason was, mainly, to allow business to sell products and services online to the customers.
 The dot-com bobble was starting. You could hear everywhere that if you were not in internet, you didn't exist. And, of course, companies needed technical people to take them to internet: the web designers (at that time, the pages were statics). The demand was very high, and suddenly, there were more designers than desktop programmers in the market.

But, modifying a page each time a change was needed, was not good. The constant maintenance was a pain, for the business and for designers.

That's when IT companies, started to sell the "dynamic pages". Pages that were modified in the server before they were served.
Of course, to do this, you needed to tell the server how, and that's where specific languages and technologies came to the field. If you was a web designer, you needed to learn these languages, so, you could be a web developer.

Some of these languages were PHP and ASP. At that time, I was a desktop developer. I never thought this "web thing" would ever replace my "very responsive" desktop applications. But as every geek, I was looking at that other world very closely.

Suddenly, something went wrong. Dot-com bubble exploded, and all these developers started to join the companies they had been working for. The applications exposed to internet were still there, but the demand was low now. The companies, started to need, again, internal applications to manage their business. But they were full of these web developers... and if all you have is a hammer, every problem is a nail.

The web developers were that much, that soon you could not talk about desktop applications. They, helped by the IT companies (remember the publicity of the Browsers war) sold to the business that web apps was the future. And the companies bought it.

But, there were some problems.
1) Web is stateless, so, you needed some tricks to maintain the status of the page (most of the time, using hidden fields, maintained manually, even Microsoft created the Viewstate... which was another headache)

2) Responsiveness:  Users were used to work with very responsive desktop applications (most of them, working with mainframe terminals, DOS+xBase, or some old good apps made with Visual Basic 6) , started to ask the same to these web applications. But the apps, were not designed for that... because the protocol they were running (HTTP) was not designed for that either. When the client needed to send data to the server, the whole page was redrawn. I still remember myself waiting 12 seconds looking at a white screen to get a response.
 Why would a user need to see 200 records at the same time? Just because he could do that with his old desktop app?  No way! This new web application is not wrong, the user is!. He is working wrong and he has to learn that now he will need to filter better and paginate the results.

Desktops apps never had these problems.

Meanwhile the world, with the Web 2.0, was selling the web as the silver bullet, the developers were used to solve the web development problems, to live with them, and to convince everyone those where not problems at all, but features.

There was a little star in the sky, it was Flash. But, the fans of the web, didn't like it, because compared to writing text, real programming was too hard. Also, Microsoft tried to introduce  Silverlight, getting the best from both worlds (web apps availability and desktop responsiveness), but the open and standard web wave was too big (Quickly Microsoft understood that instead of fighting, it was better to mount it, becoming one of the promoter of HTML 5)

Some more ingenious developers, started to work within the client side, to do little things in the browser. Of course, at the beginning it was clandestine, not standard... but hey, this solve those inexistent problems! That was the beginning of AJAX. (which had the AJAX frameworks war itself)


Now, we have a salad made with server side code, html (and its DOM), javascript and XML.

The apps are not responsive enough though. So, let's season the salad with some condiments. Let's add  new techno-patches like Jquery, Knockout.js, Json, Node.js, Angular.js, and God knows what else.

Yes, now we have Single Page Applications.

The apps are becoming more complex than ever. And they will be more complex even. The internet of things is almost there.

And the effort to develop and maintain this apps is huge, compared to do the same with desktop applications. And of course, the responsiveness of the web, will never be the same than the desktop one: web transmits text, desktop transmits binary.

The users are being changed. The old people is retiring, and the new employees are used to the web. They don't mind to wait a half a second to get the result. They don't know it could be much faster.

End of the story.

Trailer for the second part: There is coming an age, where the amount of data is unbelievable. That half second could become half an hour easily. When that time arrives, will we start to use the right tools to do the job, or will we still be selling that the low responsiveness is normal and what is wrong is the amount of data?


 


1/10/13

Call yourself a programmer, if you want to.

First, I recommend to read this article called "Don't  call yourself a programmer" (or you can just read the resume in the lines below)

It says that business is  divided in two big areas: Profit Center (part of the business that generates money) and Cost Center  (a necessary waste), and that engineers should be attached to the first one, either adding revenues or reducing costs.

I agree. Add revenue or reduce cost. It's a simple rule.

And then, he says that "“Programmer” sounds like “anomalously high-cost peon who types some mumbo-jumbo into some other mumbo-jumbo.”

And I deeply disagree.

If you've decided to create a piece of software because this will add value to the business, then the added value must be greater than the costs of creating it.

Added value > software costs

So, how we increase the added value? This is what our leaders are trying to teach us: "Know the business", "Think in their processes", "We are here for the business", "The new vision", etc., etc.

But also, we could try to decrease costs.

What are these costs?
Several. But one of the most important is the maintenance costs. In average the 60% of all the costs in the software life cycle (from an IEEE Software's article: "Frequently Forgotten Fundamental Facts about Software Engineering")


How could you reduce it?
Focusing in the quality of the software. The bigger the quality, the less maintenance effort needed.

And how could you get that high quality?
Directly from the people. But not any kind of people. Programmers, developers. Technical people.

What's the point of creating new programming languages, techniques and tools for different activities of the software life cycle, design patterns, frameworks, conventions, etc. etc.? It's to increase software quality, and so for to reduce costs!

And these are only learnt by programmers. So, you need them.

Call yourself a programmer, if you want to. You will be a valuable asset for any company leaded by smart people.

22/2/13

Evolution?



A: I use TCP to communicate computers.

B: TCP! But it has no standarized message format, and it is not human readable! What if I need to communicate with your computer? Should I learn your language?

A: Well... if you want to communicate with me, then yes.

B: That's not acceptable. Hold on, I will make something awesome.

-- Time later

B: Here, let me introduce HTTP. It's a protocol over TCP, where anyone can read the message!

A: Isn't it to allow browsers to request HTML to display pages?

B: Yes, but we can use it for other things, like communicate our computers! It's perfectably readable by any human...

A: But I don't want to read the message, I just need my computer does...

B: No sense. How do you know if a message is wrong? You need to read it! And, you have not to configure the router to open ports anymore!

A: Well, everybody is pushing it, so, let's try.

-- Time later

B: Hey, A! This message is wrong.

A: No, it is not.

B: Yes. It's supposed you should send me the charater 'X' in the position 'Y'.

A: No, it is not supposed to. As you can read the message, I assume you know where the 'X' character is.

B: Humgrpfh... hold on.

-- Time later

B: Hey A!, look at this! I've called it XML. You can define your own tags! No more HTML!

A: It's more text.

B: Yes, but it's designed to transport and store data. Over HTTP!

A: Weren't we ok with TCP?

B: No, no, no. This is the silver bullet!

A: ok... :(

-- Time later

B: Looooook what I ha-ave!

A: Oh no, not again.

B: Yes! It's called SOAP! People was using XML over HTTP that much that I needed to standarize it in some way. Now, you can define how to communicate with you through this new thing: the WSDL

A: So, now I have to tell anyone how to talk with me! Wasn't that the problem with TCP in first place?

B: This is different. You publish your specifications once, everyone can read it.

A: Here we go again...

-- Time later

B: Hey, this thing, HTTP+SOAP... they are calling it webservices.

A: Yep.

B: And Microsoft now have WCF, that groups all the communications services in just one API.

A: Yep.

B: Well, it's being used a lot, but you know... Web browsers cannot handle well SOAP..

A: That's why they read HTML. But, hold on... why a web browser is consuming a web service?

B: To make a web page more responsive.

A: What! Don't we have binary code running in our machines that is enough responsive?

B: You know, internet is pushing everything to HTTP, even transactional applications...

A: It's crazy! Web pages are slow! You have to have a browser to run them! You are not taking advantage of the client power! And even worse: developing a web application with similar functionality and responsiveness than a binary takes more time and effort!

B: These are not web pages any more. Now they are web applications.

A: What the... Call it as you want !

B: And, this thing, SOAP, is not well managed by javascript...

A: We are asking to HTTP more than it was designed for!

B: I think this is not the problem... So, now MS has been pushing ASP.NET MVC... and people is using the controllers as a service layer

A: ..

B: They are not using SOAP...

A: ..

B: They are using JSON, that is readable by the browsers.

A: Right. Let the server serve what the customers-browsers want. I remember when to consume a service, you needed to know what to ask and handle the response as you could.

B: Yes. Well, and now, because of the servers returning JSON, we have something called Web API, that uses the HTTP verbs.

A: Hey, wouldn't it have been better to standarize a TCP port, create a new protocol over TCP and standarize the messages structures than trying to use HTTP for what it was not designed for?

B: No, no. HTTP is fine. It was already there, so we took it.

A: It still is stateless, and we have 2 intermediaries: Browser and Web Server... so it is slow.

B: That's why they are trying to make web applications more responsive.

A: Solving the problem they created, you mean.

B:  C'mon. How hard this can be?

A: Let me put this black over white: I have a lot in the desktop development: C# with Generics, Linq, lambda expressions, reflection; a complete .NET framework; a great editor that alows me to make refactoring, handle files, debug, edit and continue, etc... And because you dont't want people to download the application we are making everything web?

B: Right.

A:  Now, compare that to the technology in the client: HTML + javascript.

B: Right.

A: Javascript! Are you kidding me? A not evolutioned langauge? Not typed? A deficient Intellisense? No refactoring tools? Not decent editor? Not compiling errors! You know what we are talking about? NOT COMPILING ERRORS! of course, if it is not compiled... Everything is a string in there !! So, a typo is not dected until the application is running!...

B: You have frameworks: Jquery, Knockout...

A: Great, frameworks that only encapsulate functionallity. They do not add anything. Is it much to ask Generics? Even VB6 was better than that!

B: There are people working in something called Typescript...

A: And what is my view? a DOM. At least I have Objects in there... but with JQuery selectors, everything is a string again! I dare you to rename a control, and find it in you code in javascript...

B: You can find in the files...

A: And when I get the data... what is this JSON thing? More string! And if I want to use this information, what type of data are these? We don't know, as it is not typed !



A: Even when I developed desktop applications, my received binary package could be mapped to an object using MS Remoting! Can these be done in javascript? Of course! How? JSON is a 'Object Notation', right?. So, when I get the data... OMG, IT'S A STRING AGAIN!!

B: Well...
A: And what if the string comes with the 'X' character in another position different than 'Y'? Does it sound familiar to you?

B: Errr... I have to go. Happy development!


Based on a couple of conversations in ALT.NET Hispano, and this entry: http://blogs.microsoft.co.il/blogs/idof/archive/2012/03/05/wcf-or-asp-net-web-apis-my-two-cents-on-the-subject.aspx

27/4/12

Coding level: OMFG

------------------------------------------------------------
isActive = True

If InStr(straTemp(0, 0), "inactive") > 0 Then
    isActive = False
ElseIf InStr(straTemp(0, 0), "Inactive") > 0 Then
    isActive = False
ElseIf InStr(straTemp(0, 0), "INACTIVE") > 0 Then
    isActive = False
End If
--------------------------------------------------------------

'My comment: Dios quiera que el usuario no tipee "inActive"

25/12/10

Simplemente sin desperdicio

So, you wanted to be a computer programmer.
Tan parecido a la realidad...

http://gizmodo.com/5716226/so-you-wanted-to-be-a-computer-programer

18/8/10

Complejidad

"Cómo manejamos la complejidad?, pregunté a unos cuantos arquitectos de software... Todos ellos contestaron:[Abstracción]... en matemáticas, hay un principio que ningún arquitecto tiene en cuenta: La complejidad es constante. En otras palabras, si estás diseñando un sistema inherentemente complejo, no puedes reducir la complejidad... La abstracción, básicamente esconde esa complejiad... En muchos diseños, el problema es que una vez que la abstracción escondió la complejidad, los diseñadores tienden a olvidarla...y volverá algún día"

Excelente comienzo de éste artículo.

Seguidores