Category Archives: Technology

Making Thread Dumps Intelligent

When you have to spend hours and hours and mostly on night, weekends and your anniversaries you ask yourself what could I have done better during development to make this all go easy on me.

Thread Dumps are you best friend when a production application (Java) crashes and if you can enable it to tell you something about the application then thats something. Here I have explained how and have included a bunch of Java Code you can reuse.

Unit Testing in AEM (thinking loud)

Unit testing is an art – an art that doesn’t need to be confined to boundaries drawn decades back. AEM has made unit testing even more tough with its evolution and people are still trying to find the best fit aka what will work for them.

This article tries to explain some of my thoughts and what ways i would like to tackle unit testing in AEM and it’s not traditional in any ways.

I dont think there is one right way of doing it and this is just a beginning….

High availability design

Of course, eventually with many fixes over time you will eradicate a lot of cases that led to failures but it would have taken you so long and the reputation that the brand holds do dear is already damaged. You can chose to design for High Availability or you can chose to be just like Indian Railways – always delayed and always cancelled – a perspective that will i don’t think will ever be fixed no matter what they do.

AEM Development Workflow – Part 3 (Coding Old School)

The journey was nothing but painful all along the way. It took me 5 hours to do what should have been a few minutes job. The Site developer had the code up and running in a HTML file in a browser and all I had to do was to make it work “as is” within CQ. It seemed like the Force of Nature were working against me and everything I did, had a problem in it. I finally got it up and running (the designs done match off as is still), but it was excruciating pain.

AEM Development Workflow – Part 2 (finding the problem)

The AEM workflow problem is not really an inefficiency in the handover of HTMLs to CQ developers but how we should have been writing the code to begin with. We start here by seeing where the problem starts and how the code has been written. Unfortunately, we do see the OOTB Code in AEM as provided by Adobe itself are not coded to solve the problem. When I speak with Adobe they make it clear that these are reference sites and are to used as “Self-learning” but little did they know at the time that people will take this a practice and convert this into a culture.

Tip: Using AEM Developer Tools for Eclipse

This is a key step, and unless you get all those dependencies and if your project is brand new your project will not compile. If you are using an existing project it may just work if you have added those dependencies, but from experience as we dont compile JSPs those dependencies will not kick in. The code still works on CQ server because those dependencies are available at runtime.

(Unit Testing) – Cost vs. Benefit

In the current world of marketing, where we have clients who want to run campaigns in next 2 weeks, we can’t be slow in how soon we release code. You can only be relevant in the industry if you can move quickly, achieve the Continuous Delivery or at least reach a point when you can get releases out in production with a reasonable speed. Those days where releases used to happen once every 6 months are gone; or at least gone in the environment/market I am operating.

We have to have Self Testing Code, We have to Unit Test, We have to have feedback loops and We have to have feedback loop as soon as possible. There is no avoidance; let’s understand and embrace Or be extinct in a few years.

Unit Testing – Why not?

Not doing Unit Testing (again not saying “automated”), is like someone telling me – Kapil, you are driving to go to your wedding and you are late and now you have to drive faster. But, instead of putting in a few more airbags and giving you better set of wheels, better brakes; We are going to take the 1 Air Bag you have today and also replace your wheels with an older set. Now, go drive else you will not get married. What do you think I would do – Drive faster and risk my life or start driving even slower because I hope that my would be wife loves enough to know that I had no option but to drive slowly. Well you get the point – While I may get married, She is going to stay mad at me for a very long time for ruining her perfect day.

Thick Clients and CMS

Can a technology like Angular be used in the world of a CMS to solve the process problems where it just takes too long to get HTMLs from Site Developers into CQ’s templates and that too with a degree of quality that we are expected to deliver. This article lays down the foundation of what the challenges are and how it has started to impact our day to day life. The answer is not that simple, but at the looks of it, it seems we are using a technology to solve for a problem which is actually a people or a process problem. You can of course introduce a new component in the mix, but I still believe until people are ready to change, this new component wont do shit.

Caching Architecture (Adobe AEM) – Part 1

Cache (as defined by Wikipedia) is a component that transparently stores data such that future requests for data can be faster. I hereby presume that you understand cache as a component and any architectural patterns around caching and thereby with this presumption I will not go into depth of caching in this article. This article will cover some of the very basics of fundamentals of caching (wherever relevant) and then will take a deep dive into the point-of-view on the caching architecture with respect a Content Management Plan in context to Adobe’s AEM implementation.

 

Problem Statement

Principles for high performance and high availability don’t change but for conversation sakes lets assume we have a website where we have to meet the following needs.

  • 1 Billion hits on a weekend (hit is defined by a call to the resource and includes static resources like CSS, JS, Images, etc.)
  • 700 million hits in a day
  • 7.2 million page views in a day
  • 2.2 million page views in an hour
  • 80K hits in a second
  • 40K page views in a minute
  • 612 page views in a second
  • 24×7 site availability
  • 99.99% uptime
  • Content availability to consumers in under 5 minutes from the time editors publish content

While the data looks steep┬áthe use case is not uncommon one. In current world where everyone is moving to devices, and digital there will be cases when brands are running campaigns. When those campaigns are running there will be needs for support such steep loads. These loads don’t stay for long but when then come they come fast, they come thick and we will have to support them.

For the record, this is not some random theory I am writing, I have had the opportunity of being on a project (I cant name) where we supported similar number.

The use case I picked here is of a Digital Media Platform where we have a large portion of the content is static, but the principles I am going to talk here will apply to any other platform or application.

Learning MongoDB // The CRUD

The other big takeaway was that working with mongo’s document structure is much more simpler to what RDBMS is. While was I working in mongoshell where I was using JavaScirpt to write code and later when i moved over to Java classes it was fairly simple. It was all about knowing 3 classes (if not 2) and you are done. Working with Maps (or Dictionaries) is pretty simple and using that knowledge in any language cant really be difficult. I was able to go back and learn JavaSciprt all over again and code a logic pretty quick.

Learning MongoDB // It sinks in

a) Pretty quick to get going off the ground. I’d actually use this one instead of a mysql if i am trying a few things and need to use quick-start backend. (where in production – i don’t know yet)

b) If you are taking this course be mindful of not making judgements on the technology or how you’d want to use it especially model your schemas (or shall I say documents). Wait for the now or go and read more.