Reactive Streams and DynamoDB

Introduction

In this blog post, I'm going to demonstrate how Reactive Streams can allow us to elegantly work with DynamoDB, a key-value data store with a predetermined write capacity.

DynamoDB

DynamoDB is an Amazon managed NoSQL database. Amazon DynamoDB Documentation

The performance characteristics and client behaviour of DynamoDB are very different to traditional data stores (for example, databases). When working with a relational database, performance may gradually decrease as load on the database increases. DynamoDB tables have a configurable read and write capacity, specified as the number of reads / writes per second the table will accept. AWS charges based on the provisioned capacity. Exceed this limit and DynamoDB will reject the read / write. If using the AWS Java client, this failure will be represented as a ProvisionedThroughputExceededException.


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What are these Applicatives you speak of?

Introduction

In this blog post, I'm going to provide a very simple explanation for Applicatives (aka "Applicative Functors") just the way I know them. I'm not going to cover the math behind it, or the laws which applicatives must obey.

I've taken a reverse approach compared to many other posts explaining Applicatives: rather than starting with what Applicatives are, I'm going to start with some examples to demonstrate the need for them, then I'll show how Applicatives can be used and at the end, I'll briefly cover how they can be implemented.

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Girlapalooza – for women who dig digital at REA

Hello and welcome to the inaugural Girlapalooza blog post, with me Miss Leah(pleurodon) Eramo, at your service.

What is Girlapalooza?

A couple of years ago, a few of us who were interested in technology came together and formed a group to collectively harness the talent, passion & creativity that women at REA possess.

Girlapalooza is a community that positively engages women within REA in activities relating to digital technology, marketing, design and leadership.

Girlapalooza embraces women of all abilities and backgrounds, with a positive philosophy of fun and inclusion.

This month I am featuring an interview with REA’s 2016 Big Idea winner and my team mate, Linda Brunetti. So read all the way through to catch her interview.

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Functions as Child Components and Higher Order Components

I have recently been on a Higher Order Component (HOC) craze. HOCs are a good tool for implementing cross-cutting concerns or common functionalities, such as logging and tracking. For more information on HOCs, check out this recent post by my colleague Mehdi Mollaverdi!

Then I discovered Functions as Child Components (FaCC) and a couple of my brain cells perished. FaCC’s are components that receive a function as their child. For example:

So let’s take a trip through struggle town.

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And so we tried to build the Census Platform.

REA runs a plethora of special interest guilds that anybody can join. These guilds get together every now and then to trade smarts, share stories, or just to talk about new, shiny tech.

One of these guilds is the Ops Guild – which over time, has morphed into a challenge/gauntlet where everyone with an interest in Operations can get together and sharpen their Ops skills. We run troubleshooting dojos, breakfix scenarios, and a couple of games – and given recent events, we felt the need to be relevant…

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