When building micro-services it is very important to take into consideration which messaging mechanism you use. There are several ways in which micro-services communicate using different messaging protocols. Today we will focus on the AMQP messaging protocol with rabbitmq and asp.net core. What is Rabbitmq ? Rabbitmq is a messaging system that permits your applications communicate together using messages and queues. Rabbitmq uses the AMQP (Advanced Message Queuing Protocol) messaging protocol. It is opensource and is very robust. Rabbitmq is written in Erlang, a functional programming language created for telecommunication systems by Ericsson. Erlang is a concurrent programming language with several other features which permit it to be an ideal choice for building highly robust and resilient messaging systems. How Rabbitmq Works As we mentioned earlier, Rabbitmq implements the AMQP protocol. Here is a brief overview of how messages are sent via rabbitmq. An application willing to send messages (Producer) to another application, does so through a broker (Rabbitmq). The broker then receives the message via an Exchange which is then responsible for routing that message to appropriate Queues using routing keys and rules called bindings. The message is then received by another application which subscribes to the given queue (Consumer). You can learn more about this process here. Some other attributes of this communication process could be configured, like sending acknowledgements when a message is received, persisting a queue in a database e.t.c. There are several types of exchanges in Rabbitmq and each determines the way in which your message is routed to corresponding queues. Rabbitmq and ASP.net Core Though rabbitmq seams a little bit complicated in the...
While CSS isn’t as widely used as JavaScript, it’s still in the top 10 coding languages, according to Redmonk. Since CSS is quite robust, reasonably easy to learn, and universal across different browsers, it’s popular among website developers. As it is with every coding language, there are several shortcuts or hacks with CSS that allow you to write cleaner code, improve design elements, and save valuable time. Furthermore, you can directly insert these snippets to your site using a code editor. It is also important to know that you don’t have to be a senior web developer to use CSS. Data from W3Techs show that CSS is used by 96 percent of all websites, and being able to use CSS to enhance the layout and appearance of a website is integral to the functioning of major open source CMSs like WordPress. In fact, most of the biggest website builder tools (generally known for promoting a “What You See Is What You Get” or WYSIWYG approach) now allow users to insert custom CSS code. If you’re new to CSS, freeCodeCamp has an excellent tutorial video on Youtube where you can learn the basics. If you already know the fundamental aspects, then let’s get started with these ten CSS hacks. 1. How to position content in the center with CSS Placing content in the middle of the screen might be tricky. However, you can use position: absolute to override the dynamic placement and always position the content in the center. It also works with every resolution across devices. However, always double-check if everything is positioned as you want it and the...
Greetings! Glad to see you back. This is the fourth and final chapter in our React Native and Redux cryptocurrency app series. So far we have: Set-up our project Wired up Redux Fetched data with Redux The only thing for us to do is create our views with React. The most fun part! Where we left off Quick change: set the CryptoReducer.js intialState data prop to an empty array instead of null! It won’t work if you don’t do this — apologies! https://medium.com/media/16bd7b521486654913c023e861688a0d/href Alrighty, here’s what’s left to do: Create a stateless component called CoinCard.js and create the list item. Remember the sketch called “thinking in React” from the old times? “Thinking in React” Source This perfectly explains how our app works. It goes like this: The yellow border is our App.js — app container Blue border is our Header.js component Green border is our CryptoContainer.js — holds our list items Red and neon blue is our CoinCard.js — lists items. Makes sense, right? All we need to do is implement the red and neon blue borders. Start by creating the stateless component. Looks good! Import View, Text, StyleSheet from “react-native” — we need these to create our view. Next let’s declare our props. Let’s name these the same as the data in our API. Next up, let’s add the coin icons. Unfortunately, the API does not include icons, so we have to compensate. Not to worry — I’ve got your back! Make a file in Utils called CoinIcons.js and add these links. I uploaded the icons to and host them as static assets. If you want to help me — feel free to add the rest and make a PR! Here’s the icon set. https://medium.com/media/85f3cf9bfadd9144241eef24be98ccbf/href Did you notice something new other than the CoinIcons folder? Yep, we imported the Image tag from...
by Michael Cheary Looking for a new skill? Cyber security could be for you… With businesses increasingly concerned about the safety and security of their information, demand for people working in the industry is on the rise. In fact, cyber security jobs advertised on reed.co.uk are up 99% year-on-year – meaning there’s never been a better time get started. We spoke to the experts at e-Careers, one of the UK’s biggest providers of cyber security qualifications, to find out more about the current skills shortage – and how you can help fill it. What is cyber security? Cyber security is the name given to the technologies and processes set out to protect online data – primarily from attacks and unauthorised access. It’s a billion pound industry, and one that continues to grow as threats from the likes of malware, ransomware, phishing, DDoS attacks and hacking steadily increase. Why is cyber security important? With almost all of our personal data now stored online, cyber security attacks have the potential to completely ruin businesses – not to mention people’s lives – in the process. And with a number of recent high-profile attacks, such as those on the NHS, Yahoo and LinkedIn, companies are becoming increasingly concerned with any potential leaks that could occur. This means companies large and small are turning to cyber security professionals to help them keep their sites and their customers’ details safe. Why is there a cyber security skills gap? Because of how fast the numbers of cyber security opportunities out there are rising, the UK workforce is struggling to meet demand. According to a 2020...
Credit: CC0 Public Domain A huge volume of digital data has been harvested, stored and shared in the last few years from sources such as social media, geolocation systems and aerial images from drones and satellites, giving researchers many new ways to study information and decrypt our world. In Switzerland, the Federal Statistical Office (FSO) has taken an interest in the big data revolution and the possibilities it offers to generate predictive statistics for the benefit of society. Conventional methods such as censuses and surveys remain the benchmark for generating socio-economic indicators at the municipal, cantonal and national levels. But these methods can now be supplemented with secondary, mostly pre-existing data, from sources such as cell-phone subscriptions and credit cards. According to the FSO’s 2017 Data Innovation Strategy, “The goal of data innovation is to enhance the quality, scope and cost-efficiency of statistical products and to reduce the response burden on households and businesses.” Anonymized data Against this backdrop, a team of scientists at EPFL’s Laboratory on Human-Environment Relations in Urban Systems (HERUS) conducted a ground-breaking study on novel uses for the data held by insurance companies. The lab’s leading partner company, La Mobilière, provided anonymized data from hundreds of thousands of policyholders. These data included factors such as age, residential postal code, car- and homeownership, and employment status. “We wanted to see if we could use these data to predict specific socio-economic indicators—ones that could give us a better picture of the quality of Switzerland’s urban areas. One big advantage of the data held by insurers—provided they’re willing to share it—is that they are cheap to use, since...
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