Code Combat II : The Code Battle For The Vanguard Continues…

June 28, 2018Akka, Apache Kafka, Apache Spark, Blockchain, Java, ML, AI and Data Engineering, ScalaAkka, Blockchain, events, java, learning, Machine Learning, scala, technology

“If you can dream it, you can do it. ” -Walt Disney For some coding is a job. For some, it is an exercise. But for us folks here at Knoldus, it’s a Passion. So in order to bring a twist in the daily work schedule, Knoldus held an overnight Hackathon competition within the organization on 18th May 2018 which presented an opportunity for every Knolder(employees Continue Reading

Stream a file to AWS S3 using Akka Streams (via Alpakka) in Play Framework

May 4, 2018July 23, 2018Akka, akka-streams, Play Framework, ScalaAkka, akka-streams, alpakka, amazon web services, AWS, aws s3, File Transfer, File upload, Play framework, Reactive Programming, reactive streams, Streaming

In this blog post we’ll see how a file can be streamed from a client (eg: browser) to Amazon S3 (AWS S3) using Alpakka’s AWS S3 connector. Aplakka provides various Akka Stream connectors, integration patterns and data transformations for integration use cases. The example in this blog post uses Play Framework to provide a user interface to submit a file from a web page directly to Continue Reading

Streaming data from PostgreSQL using Akka Streams and Slick in Play Framework

March 26, 2018July 24, 2018Akka, Play Framework, Scala, Slick, SQLAkka, akka-streams, CSV, Play framework, postgreSQL, slick, Streaming

In this blog post I’ll try to explain the process wherein you can stream data directly from PostgreSQL database using Scala Slick (which is Scala’s database access/query library) and Akka Streams (which is an implementation of Reactive Streams specification on top of Akka toolkit) in Play Framework. The process is going to be pretty straightforward in terms of implementation where data is read from one Continue Reading

Knolx: Guaranteed No Stress Baby Steps Using Akka Streams Part-II

February 20, 2018August 10, 2018Akka, Java, Scala, StreamingAkka, akka-streaming, akka-streams, java, scala, Streaming, technology

Hello everyone, Knoldus organized a session on 25th November 2017. The topic was “Guaranteed No Stress Baby Steps Using Akka Streams Part-II”. Many people attended and enjoyed the session. In this blog post, I am going to share the slides & video of the session. Slides:

Knolx: Guaranteed No Stress Baby Steps Using Akka Streams Part-I

February 20, 2018August 10, 2018Akka, Java, Scala, StreamingAkka, akka-streaming, basics, java, scala, Streaming, technology

Hello everyone, Knoldus organized a session on 28th October 2017. The topic was “Guaranteed No Stress Baby Steps Using Akka Streams Part-I”. Many people attended and enjoyed the session. In this blog post, I am going to share the slides & video of the session. Slides:

Akka Split Brain Resolver – Problem and its Solution

July 4, 2017July 4, 2017Akka, ScalaAkka, akka-cluster, Akka-SBR, scala, Spilt-Brain-Resolver

AKKA Split Brain Resolver When operating an Akka cluster the developer will surely comes around network partitions (Split Brain scenarios) and machine crashes. There are multiple strategies present by lightbend to handle such erratic behavior and, after a deeper explanation of the problem we are facing, I will try to present them along with their pros and cons using the Split Brain Resolver in Akka, Continue Reading

Cinnamon: Way For Monitoring & Metrics Generation for Akka ActorSystem

July 3, 2017August 10, 2018Akka, Scala, Telemetry#Cinnamon, #telemetry, actosystem, Akka, cluster, gradle, lightbend, Logback, logs, maven, opensource, sbt, scala, technology

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

Routing DSL in Akka HTTP

June 13, 2017June 8, 2018Akka, akka-http, Scala, Web ServicesAkka, Akka http server, akka-http, directives, dsl, High level server Api, http, http request, HTTP server, https, low level server api, Routes, Routing, routing dsl, Server Api

In this blog we’ll be discussing about the Routing DSl provided by Akka HTTP High level Server Side API. Akka HTTP provides a very flexible “Routing DSL” for elegantly defining RESTful web services. It picks up where the low-level API leaves off and offers much of the higher level functionality of typical web servers or frameworks, like deconstruction of URIs, content negotiation or static content serving. Continue Reading

Akka HTTP vs Other REST API Tools

June 12, 2017June 12, 2017Akka, akka-http, Play Framework, ScalaAkka, akka-http, Finch, http4s, play, scala, Scalatra, Spray

Hi Folks ! Lately there have been a lot of tools that allow us to build rest APIs like the following : Akka Http Play Scalatra http4s Finch Spray In my blog today, I will be discussing Akka Http and its counterparts(competitors) in terms of their advantages, disadvantages, performance and use cases. Let us begin comparsion of Akka-Http with Scalatra. Scalatra is a thread based,it Continue Reading

Say Hello to “Akka-Http”

June 12, 2017July 17, 2017ScalaAkka, akka-http, http, starting with akka

Hello folks, Hope you are enjoying your coding days!!! in this blog, I will explain a cool technology named Akka-Http which i have recently explored in my coding days!! Introduction The Akka HTTP implements a full server- and client-side HTTP stack on top of akka-actor and akka-stream. It’s not a web-framework but rather a more general toolkit for providing and consuming HTTP-based services. Akka.Http comes with Continue Reading

First interaction Artificial Neural Network

June 8, 2017July 12, 2017ScalaAkka, Artificial intelligence, Axon, Cell Body, Dendrites, Machine Learning, neural networks, Neurons, scala, Synapse

I hated biology in my school days and loved mathematics. After a long period of time I get to learn something which combines both mathematics and biology together, that is Artificial Neural Network short for ANN, inspired by biological Neural network. Though you might find it weird, that is how I would like to define the artificial neural network. When we say biology here, it Continue Reading

Solr With Scala : Basic Introduction to Embedded Solr

April 4, 2017April 4, 2017akka-http, Scala, scalatest, TestingAkka, embedded Solr, embeddedSolr, Integration Testing, Solr, SolrJ

Hello Folks, As we discussed earlier Solr with Scala and AkkaHttp in our last blog we have used Solr as a service and tried to hit solr service with the AkkaHttp and spray routes. Here is the link for the Recap. When we want to do testing for those methods which are creating connection with the remote solr server, have to use Embedded Solr for Continue Reading

Knolx – Akka Finite State Machine

March 24, 2017August 13, 2018Akka, ScalaAkka, concurrency, finitestatemachine, fsm, hotswap, knolx, multithreading, opensource, technology

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.

Akka