Time and Relative Distance in Source (Code)

Reasoning about a program’s behavior is extremely tricky in the best of circumstances. When you throw in asynchronicity, it is the absolute worst. It’s like your code is trapped in a convoluted time travel movie. You want to perform some operation, but that requires stepping into a time portal and coming out at some indeterminate […]

Exporting a Java Library to a Xamarin.Forms Android Project

The device on our current project has two unique software development kits (one for Android and one for iOS). My team wanted to use Xamarin.Forms to create an application for the device so that the core logic of the app could be stored in one place. However, in order to also incorporate the platform-specific SDK methods, […]

Dropwizard Deep Dive – Part 3: Multitenancy

Hello once again! This is Part 3 of a three-part series on extending Dropwizard to have custom authentication, authorization, and multitenancy. In Part 1, we set up custom authentication in Dropwizard, and in Part 2, we extended that to have role-based authorization. For this final part, we are going to diverge slightly and tackle the […]

Dropwizard Deep Dive – Part 2: Authorization

Welcome back! This is Part 2 of a three-part series on extending Dropwizard to have custom authentication, authorization, and multitenancy. In Part 1, we set up custom authentication. When we left off, we had just used the Java annotations @RolesAllowed and @PermitAll to authenticate our resource methods, so they will only run for credentialed users. […]

Dropwizard Deep Dive – Part 1: Custom Authentication

This is Part 1 of a three-part series on extending Dropwizard with custom authentication, authorization, and multitenancy. For Part 1, we are going to go over adding custom authentication to Dropwizard.

Unsubscribing from an RxJava Observable Mid-Stream

Imagine a scenario where you need to create an Observable sequence that will acquire a resource, do some processing, and release the resource when unsubscribed from. An example of something like this might be an Observable that acquires a lock and releases it when unsubscribed from. That “lock” signal could be merged with a second […]

Using Hibernate DAOs in DropWizard Tasks

I’ve previously blogged about DropWizard, a Java web framework for developing RESTful web services. One of Dropwizard’s great features is its ability to easily write and deploy runtime administrative tasks for you application.

More Typing, Less Testing: TDD with Static Types, Part 2

In part 1 of this post I claimed it’s easy to test-drive our way into a poor design. We looked at some techniques for using types with TDD, but the examples were simple. Today I’ll walk through Kent Beck’s Money example showing where the design fails and how it can be improved with types.

More Typing, Less Testing: TDD with Static Types, Part 1

I learned test-driven development from Kent Beck’s book Test-Driven Development By Example. It’s an excellent introduction that whets the appetite for one of my other favorites, Growing Object-Oriented Software, Guided by Tests by Steve Freeman and Nat Pryce. Both of these books have a blind spot, though: they are completely silent about how modern static […]

Serving Static Assets with DropWizard

Over the last few months, I’ve had the opportunity to do a lot of work with DropWizard, an awesome Java web framework for developing RESTful web services. I was recently prototyping a small application, and I wanted to serve static files directly from DropWizard. While this isn’t what DropWizard is primarily designed to do, I […]

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