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(Ab)using Java 8 FunctionalInterfaces as Local Methods


If you’re programming in more advanced languages like Scala or Ceylon, or even JavaScript, “nested functions” or “local functions” are a very common idiom to you. For instance, you’ll write things like fibonacci functions as such: def f() = { def g() = "a string!" g() + "– says g" } (Question from Stack Overflow by Aaron Yodaiken) The f() ...

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Couchbase Docker Container


Couchbase Docker images are always at Complete instructions to run Couchbase Docker Container are available at Start Couchbase Docker Container How do you start a Couchbase Docker container? docker run -d -p 8091-8093:8091-8093 -p 11210:11210 couchbase By default, this command starts Couchbase Server 4.1 Enterprise Edition. The latest GA images are always available using this image name. This server needs to be manually ...

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How do low latency applications differ for regular applications?


Overview A common question we get is; What makes a low latency application different? What is it like to read? There is a number of considerations in designing a low latency application which distinguish it from other applications. Simplicity is key The best way to make something go faster is to get the application to do less work. This means; ...

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16 Metrics to Ensure Mobile Apps Success


Smart mobile teams know that developing and releasing a mobile app is just the first step in the long journey to delivering a successful and 5-star mobile app. If you have to make your app successful (however you define success – improved brand, more money, more engagement), you need to measure the right metrics, and optimize and iterate your apps ...

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Negotiating Offers That Meet Your Asking Price


Negotiating job offers is a skill, and many are reluctant to even attempt it. Like interviewing, negotiation is something that most professionals may only do a few times (or less) a decade, so it’s not the type of skill that gets honed through regular use. One question that I often hear relates to scenarios where a candidate provides a target salary/range ...

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Managers who are not managers


I’m continuing my theme of management from my January blog (“It takes an engineer to manage engineering”) we need to clear up some terminology. I often hear form people at Agile conferences that we should get rid of managers but they offer up no definition of manager. Let me suggest that the title “manager” is thrown around quite lightly these ...

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Your JAX-RS APIs were not born equal: using dynamic features


This time we are going to talk a little bit about JAX-RS 2.0 APIs and touch on one very interesting aspect of the specification: dynamic features and how they are useful. Traditionally, when JAX-RS 2.0 APIs are configured and deployed (using Application class, bootstrapped from servlet or created through RuntimeDelegate), there is an option to register additional providers and features. ...

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Longevity of Source Code


Take a look at the code you work in day-to-day. How long has it been there? How old is it? Six months old? A year? Maybe five years old? Ten? Twenty?! How much of the code is old? Less than 10%? Half? Or as much as 90%? Curious to know the answers to these questions I’ve been investigating how long ...

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Apache Spark Machine Learning Tutorial


Editor’s Note: Don’t miss our new free on-demand training course about how to create data pipeline applications using Apache Spark – learn more here. Decision trees are widely used for the machine learning tasks of classification and regression. In this blog post, I’ll help you get started using Apache Spark’s MLlib machine learning decision trees for classification. Overview of ML Algorithms ...

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