Consumers in Java Lambda World

A I mentioned in the previous post, Lambda expressions have helped simplify Collection use cases. We saw that with sorting a Collection. Let me explore some more simplifications in this post.

Lambda

This is kind of late - very late, but then like always - better late than never. So while java lovers world over have dug deep, praised, criticized and in some cases confused the developer community about Lambda expressions in Java 8, I have finally woken and decided to throw my two cents into the pit.
I was kinda too busy/lazy until I got a code review that used Lambdas. With no escape but to review it, I had to start learning Lambdas.  This post is a collection of thoughts I found online and like always just my ready notes to be available for me to refer back when the next code review comes around. With that time to get started.....

Introducing database to Spring Batch

Until now we have seen Spring batch without its meta data persistence features. When I say meta-data for Spring batch it includes batch related information - a listing of the steps executed, and their audit information, how many items did the framework read/write, did it skip any items, what was the duration of each step executed etc. This meta data is maintained in a database - persistence.

Multiple Steps in a Job

In the previous post we saw how to execute a job with a single step. A job can be composed of multiple steps. So I decided to extend the previous job to include two steps.

1. Step 1 is same as before - read csv -> process -> write to List.
2. Step 2 is read from List -> process -> write to CSV file.

Hello Spring Batch

Batch processing is something that we keep hearing in the enterprise industry. Most software projects will at some point require that certain tasks happen in the background on certain scheduled times. Such offline tasks constitute batch jobs. Send reminder emails to clients, sending job alerts to prospective candidates, fetching transactions from financial systems and loading them into analytical systems. Batch always creeps into the picture.