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Unique approach to observer/observable pattern in Ceylon

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The essence of the famous observer/observable pattern is that you have an observable object that produces events of various kinds, and one or more observer objects that register themselves as interested in notification when these events occur. Of course, we represent each kind of event as a type, usually a class, though nothing prevents us from using an interface type ...

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What are the 5 Trends for Testing in the Era of Big Data?

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In today’s world of data explosion, big data applications and their implementations are growing dramatically. As data is at the heart of any big data application, it is important to understand the characteristics of big data. The three most unique characteristics of big data are ‘Volume’, ‘Velocity’ and ‘Variety’. And these data comes in different format from multiple channels. All ...

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Jenkins HOW-TO: build a project from multiple (Git) repositories

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Recently I have been working on a project that has two main modules: Backend and Frontend. The Backend is a Spring Boot application and the Frontend is an AngularJS 1.3 application. While preparing the build we are using Grunt for building AngularJS code and Gradle for building the Spring Boot application. Grunt is creating a JAR file containing all resources ...

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A beginner’s guide to Cache synchronization strategies

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Introduction A system of record is the authoritative data source when information is scattered among various data providers. When we introduce a caching solution, we automatically duplicate our data. To avoid inconsistent reads and data integrity issues, it’s very important to synchronize the database and the cache (whenever a change occurs into the system). There are various ways to keep ...

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The Lean Learning Board

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A while back, when I wore my product hat, I started referring to the product backlog as an option backlog. We had lots of ideas going in there, but they were basically stories that we didn’t commit to implementing. Instead, we could pick from our options based on our understanding  of the market, our capabilities and so on. Only when ...

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R: Removing for loops

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In my last blog post I showed the translation of a likelihood function from Think Bayes into R and in my first attempt at this function I used a couple of nested for loops. likelihoods = function(names, mixes, observations) { scores = rep(1, length(names)) names(scores) = names   for(name in names) { for(observation in observations) { scores[name] = scores[name] * ...

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Things to consider before jumping to enterprise caching

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Introduction Relational database transactions are ACID and the strong consistency model simplifies application development. Because enabling Hibernate caching is one configurations away, it’s very appealing to turn to caching whenever the data access layer starts showing performance issues. Adding a caching layer can indeed improve application performance, but it has its price and you need to be aware of it. ...

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Managing Global Teams – Lessons Learned

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One year ago I took the most challenging decision of my software development career. I quit my daily – 40hr/week job and joined a company as a remote freelancer. That change was even more radical because I made the switch from a hands-on developer role to a “software engineering manager” role. Although I don’t like the term “engineer” for software ...

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Managers are not homogenous

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(If you are not a coder please bear with me…. we’ll get to the business point in a moment.) When a programmer finds a class named Manager in a code base they know – or at least should know – that it is probably a smell. It might be innocent but until proven so it should be considered guilty. For ...

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Automated testing of REST-services

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Despite I’m a Java and Scala developer I still passioned a lot in testing of software. If to be more precisely – web applications. It’s really interesting to develop web app and be confident that the apps have a good quality. When I’ve started a career the most popular web architecture was MVC (Model View Control) and there was pretty ...

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