Untitled @adeydas2014 - Tumblr Blog

Store elements at every level separately during level order traversal

To explain the problem, say we have the following tree:

And we want to store elements at every level in a separate list. For this example, we would have the following three lists:

1

2 3

4 5 6 7

We will use the usual BFS algorithm but with a small modification. To know the level, we will keep two variables: one to store the numbers of variables in the current level and the second to store the…

View On WordPress

#bfs #binary tree

Why the inability to access ElastiCache from outside is a deal breaker

AWS ElastiCache cannot be accessed from the outside. Amazon cites latency issues as the cause for it but this may turn out to be a deal breaker for many customers. Here’s why:

The entire infrastructure might not be AWS based

Private-public hybrid clouds is a very real scenario and most companies prefer to have their test infrastructure on their own hardware and deploy on the cloud. While it…

View On WordPress

#amazon #aws #cache #cloud #elasticache #google #memcache

GeoKettle version mismatch while developing plugins

I faced this error yesterday while working on a GeoKettle plugin:

Exception in thread “main” java.lang.NoSuchMethodError: org.pentaho.di.i18n.BaseMessages.getString(Ljava/lang/Class;Ljava/lang/String;[Ljava/lang/String;)Ljava/lang/String;

Apparently this happens when there is a version mismatch of the jars included in your project and those used by GeoKettle/Spoon.

View On WordPress

#geokettle

Found this chat with a Amazon service representative somewhere…. absolutely hillarious

#amazon #loki #odin #service #thor

Share photos with friends and family

There are so many options for this right? But lets look at the facts. Nothing is for free and there are so many places where you don’t want your photos to be even if its for free. Major services like Dropbox, OneDrive etc would charge you anywhere between $5-$10 a month once you cross their free tier, which is rather easy to do if you have photos from a couple of trips to share (photos from my…

View On WordPress

#aws #java #S3 #share photo

Avoiding race conditions in your code

Recently I was writing some code that had to be used by multiple threads in the same application. That reminded me of writing about the oh, so important race condition and how to avoid it in a multi-threaded application.

What is race condition and why should I care about it?

A race condition occurs when more than one thread tries to access the same resource and the order in which it is accessed…

View On WordPress

#critical section #race condition

Is your webservice really RESTful

REST is the new buzzword in town and more often than not I have seen people claiming their webservices being RESTful when they are not. So here is a list of things that make your webservice NOT RESTful.

It should not perform an action

The REST architecture is resource based, meaning it should provide access only to resources and not actions. If an end-point performs an action and changes the…

View On WordPress

#architecture #client #resource #REST #RESTful #server

Rajnikanth humor Found this old and gold article at Funspace. Great actor but even better is the humor surrounding him. Enjoy!

#humor #rajnikanth

Mac OSX Yosemite Beta

I got a copy of the Mac OS X Yosemite Beta and here’s some first impressions of Apple’s upcoming iteration of OS X through pictures.

Safari

Safari got several welcome changes like listing of recently visited or bookmarked pages beneath the address bar and a better visualization of tabs.

And a more beautiful tabbed view including a list of pages opened on other connected iDevices.

iCloud got…

View On WordPress

#apple #beta #mac #osx #yosemite

Notes on Jackson version mismatch with Stormpath SDK v1.0.beta

One of our projects at Tango uses Stormpath and who doesn’t use Jackson, right. So while using version 1.0.beta of their JAVA SDK, I came across this problem.

My project used jackson-asl version 0.9.5 and the Stormpath JAVA SDK uses version 1.9.11 of jackson-mapper-asl. This might cause a version mismatch conflict while constructing a new Client, typically on the third line of this piece of code:

View On WordPress

#jackson #sdk #stormpath

Amazon Zocalo: first experiences

Zocalo is a file sharing service from Amazon. Its still in limited preview but I just got access to it. So here’s a video of my first experience of Amazon Zocalo.

http://www.youtube.com/embed?listType=user_uploads&list=deydasabhishek

View On WordPress

#amazon #amazon zocalo #dropbox #file sharing

Integration testing with JUnit and Maven failsafe plugin

I am sure you know the differences between integration and unit testing but for the sake of completeness I am going to re-iterate the major difference from the perspective of a test designer.

When designing an unit test, you are concerned only about that one class, so all data coming into the class are usually mocked. However, during integration tests you need to use “real” data from the intended…

View On WordPress

#integration testing #java #Maven #maven failsafe plugin #unit testing

Find your stolen computer

If you own a laptop I am sure you are concerned about its safety. Computers get stolen everyday and while there are several softwares out there to track it down, you have to pay for most of them or very simply they might be too bloated for your needs. This is how I felt when I started looking for a software to protect my Mac. So I decided to write my own piece of software to alert me when my…

View On WordPress

#computer #IP #java #project

Hour of code - something we can learn from?!

Hour of code – something we can learn from?!

The United States is known for its entrepreneurial spirit. After all some of the most innovative organizations on the planet are headquartered here. Recently I was reading about the hour of code, a public initiative by several individual and corporate donors like Google and Facebook. The idea revolves around teaching kids programming an hour a day and help them innovate and write apps. Here’s a…

View On WordPress

#code #code chef #code.org #hour of code #programming

Remote Method Invocation with Spring

Passing objects over RPC seems like something you might not need to do too often but if you do need to do it, Spring could be a great choice. Remote method invocation (RMI) with Spring is a breeze to use and its very powerful as well. So here goes a small tutorial on how to go about it.

First a small architecture diagram depicting the flow with one server and client.

Now to the code.

(more…)

View On WordPress

#java #spring

Hello World

View On WordPress

#hello world #java #misc

Trending Blogs

Recently Viewed Blogs

Untitled