Author: Harmeet Singh(Taara)

Back2Basics: Do you know Scala Eta-Expansion and HOF Chemistry?

I am working on Scala from last 2 years, and pretty confident about Scala concept like HOF, Currying and more. But Recently again looking into the HOF (Higher Order Functions) in Scala. I am pretty confident, HOF is “Passed a function as an argument”, “Assign functions to variables” and “Return functions from function” and the conclusion is Functions are First Class Citizen. For me, these Continue Reading

Developers Needs SDKMAN Not Super-Man

Every developer has pain for setup development environment to his/her machine with lots of the setups. Sometimes, the pain goes beyond while we need to test same application on multiple versions of SDKs or virtual machines. If you are a Mac user, you have the best option called brew installer. But if you are Linux user, your pain is unpredictable. We are JVM stack developers Continue Reading

Knolders review of #venkat_50_50_tour at #DelhiJUG17 meetup

Dr. Venkat Subramaniam celebrates his 50th anniversary with distributing his smiles throughout the world’s Java User Groups (JUG) meetups, conferences, and events. Recently, he was in India and Delhi-NCR Java User Group organized one stop meetup for him. Needless to say, core to our culture of knowledge sharing caring,  Knolders were a part of the event. In meetup, Venkat spoke about Designing Functional Programs Java 8 streams and why functional programming is Continue Reading

Simple Things You Can Learn From Cassandra Nodetool (Monitor/Manage) For DC/OS

Cassandra native tool called nodetool is used for monitoring and managing cassandra cluster for dcos

Cinnamon: Way For Monitoring & Metrics Generation for Akka ActorSystem

We are developing huge applications and deployed on multiple virtual machines and clusters. For monitoring applications, we need to enable logs into our application and analysis that logs with help of some tools like elastic stack. But !! what if we need to check health of application on virtual machines and clusters? For that, we are using several Metrics for system health check like Gauges, Continue Reading

Knolx – Java 9 Modulatiry

Hi all, Knoldus has organized a 30 min session on 28th May 2017 at 4:05 PM. The topic was Java 9 Modularity. Many people have joined and enjoyed the session. I am going to share the slides and Video here. Please let me know if you have any question related to linked slides.  

Reverse engineering using Slick 3.2 and Scala

Sometime, we have requirements for create classes corresponding to the existing database or Sometimes, in our initial phase of project, we are going to design database and tables first, after that, we are going to create classes for mapping our tables. As we know, Slick is a FRM(Functional Relational Mapping) for scala. Its a kind of ORM but for scala, it supports Functional and Reactive Continue Reading

Scala Trait and Mixin – Points to Remember

Scala Trait and Mixin – Points to Remember Trait can be viewed not only as interfaces in other languages, but also as classes with only parameterless constructor. Whenever there is some code in trait, the trait is called mixin. trait Alarm { def trigger(): String } In scala trait, If we create simple class and pass parameter in constructor, without any val or var, it Continue Reading

Knolx – Akka Finite State Machine

Hi all, Knoldus has organized a 30 min session on 17th February 2017 at 4:05 PM. The topic was Akka Finite State Machine. Many people have joined and enjoyed the session. I am going to share the slides and Video here. Please let me know if you have any question related to linked slides.

Building Microservices Architecture Based Enterprise Applications in Java Using Lagom – Part I

As we know, now days, most of the enterprise applications design as a “Microservices Architecture” because of scalability, sharding, loosely-coupling and many others reasons are there. On the other hand  JavaEE help us for building an Enterprise Applications. As we know, Java help us for building a good applications, but with JavaEE monolithic approach our applications are not scalable as compare to microservices. That’s why, Continue Reading

Short Interview With SMACK Tech Stack !!!

Hello guy’s, today’s we conduct short interview with SMACK about its architecture and there uses. Let’s start with of some introduction. Interviewer: How would you describe your self ? SMACK: I am SMACK (Spark, Mesos, Akka, Cassandra and Kafka) and belongs to all open source technologies. Mesosphere and Cisco collaboration bundles these technologies together and create a product called Infinity.  Which is used to solved Continue Reading

Akka Persistence using MongoDB – Part I

Akka is a powerful actor based tool kit for Concurrency, Parallelism and Clustering. But for every concurrent applications, Akka actors are not fit because Futures are another alternative for performing Concurrency. Most of the developers follow simple rules for using Future and Actors is “Futures for Concurrency, Actors for State“. In concurrent applications most of the time we are facing race conditions and deadlocks. Because Continue Reading

Kick-Off Java 9 (Project Jigsaw & ServiceLoader) Part – II

Java  comes with major changes and new surprises for developers. Major changes came in  Java 5 and Java 8, but now Java 9 will come with new mysteries and changes. In the last post we were discussing about Java 9 with Jigsaw and in another post we were using ServiceLoader in Java instead of dependencies injections. Java 9 gives us a clean way for using Continue Reading

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