Visualizing data with Google Maps

map-screenshot A few weeks ago, a club I’m a member of was updating its membership information. Since the data was being collected in a Google spread sheet, I thought it would be interesting to create a map visualization to show where the members come from. In this post, we’ll write a map overlay which will generate a display like the one in the following image using data drawn from a Google spread sheet. Basically, we’re going to give a map a nasty rash.

You can also see the map here, or download the files here. Note that the size of each location has been fudged and bears no relation to the values originally collected in the membership survey.

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Because we can

A few days ago, my next desk neighbour, Joe, put together a neat little Chrome extension which adds keyboard shortcuts for use in NeoGAF. It looked like fun, so I wanted to make one too, and, over the course of a smoking break, decided that it should tell me how many days are left until next St. Patrick’s day. Because hey, beer.

so_far

Version 0.1 of the plugin can be installed from its own page in the Chrome extensions repository. Enjoy!
The icons used in the plugin are from the Windows Beer Set from iconka.com.

Build even less (or incredibly more) useful stuff. Check out The Little Book of JavaScript!

RESTful Web Applications with Jersey and Spring

A couple of months ago, we were tasked with creating an API to expose some functions in our system to third party developers. We chose to expose these functions as a series of REST web services. I got to play with Jersey, the reference implementation of JSR 311 (Java API for Restful Services); this turned out to be a nice surprise, as it proved to be extremely powerful and elegant. In this post, we’ll create a very simple REST web service using Jersey.

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Message formatting in Java

Whatever kind application you’re working on, you will probably need to create some sort of message more complex than “Hello World!” at some point. Whether it’s a log message, or some text to plonk into your nice UI, you will probably also need to format it in some way to include some variable values, and maybe some embellishments like using the correct words for plural and singular values.

Java provides a number of ways to do this. In this post, we’ll look at a few of them.

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Scheduling tasks with Quartz

It’s been some time since I started off in the world of software development, but I have found myself looking for a good way to schedule tasks more than once, and I’m sure you have too. You know the sort. Run this report every third Friday of the month, clean out this table at the end of every day, sacrifice a goat every summer and winter solstice, and so on.

Some tasks can happily run in Cron, provided that your operating system has Cron. However, some tasks require a bit more flexibility than this old workhorse can provide. You may need to run the task in the context of your application, for instance, or your requirements might dictate that the scheduling of certain tasks must be controlled by the users. In the case of a Java application, you might not want to start and stop the JVM every time a small task needs to execute.

Enter Quartz, OpenSymphony’s enterprise job scheduler. This API allows you to schedule tasks within your own application, which means that you’re more or less free to control the scheduling your way. In this post, we’ll look at some of the most basic tools which this API brings to the table.

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