We’re hiring a new Java developer and decided to start by asking them to write code instead of the usual Q&A.
Recently we needed to add an hourly scheduler to our sliding window data aggregator and decided this would be a good test to see how people think and code.
Data Pipeline’s query engine allows you to use XPath to query XML, JSON, and Java objects. This walkthrough will show you how to query Java objects using XPath and save the results to a CSV file. While the reading and writing will be done with the JavaBeanReader and CSVWriter classes, you can swap out the CSVWriter for any other endpoint or transformation that Data Pipeline supports. Continue reading
This blog will demonstrate how to upload Excel and CSV files into a database while using Data Pipeline to handle the differences in format and structure of the individual files. Continue reading
Data Pipeline Builder – our new web GUI – is now available in early access. DPB generates Java code for Data Pipeline by letting you configure your inputs, outputs, and transformations.
Getting exception handling right can save you hours (or even days) of troubleshooting. Unexpected production issues can ruin your dinner and weekend plans. They can even affect your reputation if not resolved quickly. Having a clear policy on how to manage exceptions will save you time diagnosing, reproducing, and correcting issues. Here are 6 tips to improve your exception handling.
We’re finally tackling a UI for Data Pipeline. Over the next few weeks, we’ll be drawing up plans and working on the first iteration/MVP (Minimum Viable Product) of Data Pipeline Builder, our online code generator. Continue reading
Data Pipeline is typically used in non-GUI applications to move data from one place and/or format to another. However, Data Pipeline can just as easily be plugged into your web, mobile, and desktop applications. Its small size and Java-centric approach makes it perfect for handling your data conversion and data manipulation use-cases.
This article will demonstrate how to download CSV (comma-separated values) and Excel data from Java web applications using Data Pipeline. It will also show one way to plug Data Pipeline into your JSPs.
In his Google I/O session Best Practices For Architecting Your GWT App, Ray Ryan discusses the benefits of using an event bus in GWT (Google Web Toolkit) applications. Inspired by this talk, I decided to try my hand at building a simple GWT event bus modeled after our pure java event bus.
In part 1 of the event bus series we discussed implementing a simple and powerful event bus using just three classes. If you haven’t read it yet, I strongly recommend you read it first.
Use dynamic proxies to create a simple, powerful event bus (Part 1)
In this blog we’ll build on part 1 by adding several important features to the event bus to make it production ready. Continue reading
In this blog I’m going to walk you through one of my favourite uses for Java’s dynamic proxies. Why favourite? Because it takes a powerful, sometimes misunderstood, feature of Java and creates a simple, useful tool that we can use every day.