Vijay Konnackal - Vijay Konnackal

Using AWS Device Farm for Pixel Validation

Use aws device farm to run selenium browser tests that validate tracker URLs in Campaign landing pages. The job is triggered by a Kubernetes CronJob.

grpc

Transcoding gRPC to HTTP/JSON

gRPC being a binary protocol, it poses challenge for quick validations using Postman or cURL. Envoy proxy can be deployed with grpc-json encoder to ease this pain. In our deployment,

nodejs

Packaging node module for AWS Lambda deployment

This article talks about a way to package multiple Lambda functions into a npm module. The module is deployed as an AWS Lambda layer, and function are required from the

protobuf

Protobufs as Kafka Messages

The article discusses using Protobufs as the messages on Kafka Topics/Streams

redis

Distributed Locks in Node applications using Redis

This article talks about using Redis as a distributed lock provider in a NodeJs application. Concurrent Access to Shared ResourcesAt each abstraction level, techniques vary for serializing access to critical

Strongly Typed Identifiers for Domain Objects

Domain objects should use strongly typed identifier as ids of Domain objects. It will make the code more readable, APIs self documenting and less error prone. How many times have

redis

Redis on Windows with Windows Subsystem for Linux (WSL)

Run Redis on Windows using Windows Subsystem for Linux.

artifact repository

S3 as Maven/Gradle Artifact Repository

The article shows how S3 can be used as a maven repository for gradle. We currently do not have a privately deployed artifact repository to easily share pre-built artifacts. While

The Stream

The stream flowing next to home...

Java Deployment Ruleset for legacy Web Start application

We have a legacy Java web-start application. As the code is downloaded remotely, the Java Security system need to instructed that the code downloaded from the source URL is safe. The URL to download the code is in the JNLP file (https://app.domain.

Handling Latency in Distributed Systems

Enterprise Applications rarely are islands. Often they have many dependencies and most often they depend on the other services. A typical example of an order usecase maybe as follows. If any of the services that the use case depends on become latent, it has

Task Throttling using Java Concurrent Utilities (Sync)

The Task Throttling using Java Concurrent Utilities (ASync) article discussed how to throttle requests asynchronously using a ThreadPoolExecutor and BlockingQueue. It is also possible to have the throttling done by the caller threads itself synchronously. This will make the caller thread to wait if

Task Throttling using Java Concurrent Utilities (Async)

Say we want to limit the concurrent access to a resource to specific number; we can use the concurrent utilities in java to achieve this. For example, as per SLA you can make only a certain number of concurrent requests. Or writes to the

Regex Development - regex101.com

Next to the Jeffrey Friedl's authoritative book Mastering Regular Expressions, the most useful tool that I've found while working on regular expression is the website regex101.com. The explanation, match info and reference are all invaluable tools, available right there.

A font story

Started off with the following font-family for the web application that I’m building font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;Helvetica Neue is a smart font popularized by iOS. But it got rendered as follows on various browsers: Chrome/Windows 8.1 - HelveticaFirefox/

IE8 - Pdf Rendering Issues

As of this writing, IE8 is still the most popular browser out there on account of Windows 7 being the most widely used OS. So naturally we end up supporting IE8, however unpleasant that may sound. Came across couple of issues around pdf rendering

JDBC - reading LOB Data as Stream (DB2)

A system stores large (>50MB) XML files in DB2 V8 (actually V8 went out of support in April, 2009. long live V8!). Following that a message is pushed to a queue to which we listen. We read the XML based on the message