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Creating a MongoDB Capped Collection in Java

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In MongoDB, it’s possible to preserve the insertion order of documents into a collection in a circular fashion. These types of collections are called Capped Collections in MongoDB. The MongoDB documentation describes Capped Collections: “Capped collections are fixed-size collections that support high-throughput operations that insert, retrieve, and delete documents based on insertion order. Capped collections work in a way similar ...

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Enumerating @NamedQuery within @NamedQueries

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Introduction If you’re a Java developer using JPA, chances are that you’ve declared one or more @NamedQuery objects on your entities. To declare a @NamedQuery on a class, the class must simply be annotated with the name of the query and its JPQL, such as: @Entity @NamedQuery(name = "findAllProjects", query = "select p from Project p order by p.id") public ...

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A Non-Blocking Benchmark

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A couple of weeks ago I asked the question “Why non-blocking?”. And I didn’t reach a definitive answer, although it seemed that writing non-blocking code is not the better option – it’s not supposed to be faster or have higher throughput, even though conventional wisdom says it should. So, leaving behind the theoretical questions, I decided to do a benchmark. ...

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Functional Interfaces

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Table Of Contents 1. Introduction 2. Justification 3. Lambda Expressions 4. Predicate<T> 5. BiPredicate<T,U> 6. Function<T,R> 7. BiFunction<T,U,R> 8. Consumer<T> 9. BiConsumer<T,U> 10. Supplier<T> 11. UnaryOperator<T> 12. BinaryOperator<T> 1. Introduction Functional interfaces are a powerful mechanism provided by Java 8 to give us the possibility to pass functions as parameters to other methods. Actually, this option already existed on previous ...

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Testing Interface Invariants

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Today’s article is something a little special. It’s the first article where I use code from my current personal project for examples. You will be getting “real world” examples and not silly, made-up examples like my Scientist and Pen example in my factories article. My Project Because of this, I’m going to make a quick introduction to what the project ...

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Making Refactoring Work

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A recent academic study raises some questions about how useful and how important refactoring really is. The researchers found that refactoring didn’t seem to make code measurably easier to understand or change, or even measurably cleaner (measured by cyclomatic complexity, depth of inheritance, class coupling or lines of code). But as other people have discussed, this study is deeply flawed. ...

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User Story Guidelines

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Disclaimer: This post was extracted from an internal Codurance document used to help our apprentices to learn how we work. We all understand that each project is different and that by no means we can apply exactly the same techniques and practices everywhere. However, the text below serves not only as a foundation but also as a guideline for all ...

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Creating Fakes in Go with Channels

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Fakes are a common testing technique that involve creating a bare implementation of an interface that you can use in testing. They usually allow you to check how they were used so you can ensure the behavior of the object under test. Normally, fakes have storage and retrieval methods, but in this post we’re going to explore using Go’s channels ...

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Displaying Paths in Ant

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In the blog posts Java and Ant Properties Refresher and Ant <echoproperties /> Task, I wrote about how being able to see how properties are seen by an Ant build can be helpful in understanding that build better. It is often the case that it’d also be valuable to see various paths used in the build as the build sees ...

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NFC Android: Read NDEF Tag

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In this post we want to describe how to read NFC tag. Android SDK provides a set of API that can be used to read the NFC payload, anyway if we look at the NFC spec we can notice there are several type of payload depending on the type of the tag. Android SDK doesn’t provide any support to parse ...

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