jessitron This week I had a major success improving the performance of our application, thanks to some judicious use of JProfiler. The key was setting the filters correctly. This post will show you how to do that. First, you need JProfiler. This is a commercial product You can get a ten-day evaluation license for free, and … Read moreProfiling for Fun and Profit
There’s a big rant floating around the internet this week about Products vs Platforms. Platforms are service-based, with layer upon layer of exposed and secured and throttled services, while Products give the user everything they need in a perfect streamlined form. That is, Products give the user exactly what the builder of the Product believes … Read moreProduct vs Platform in Programming Languages
Dart is a nascent web development language. What’s the point? I observe two. Uniformity and familiarity: Like Node.js, Dart wants to run both in the browser and on the server. It tries to look familiar to both JavaScript and Java developers, so that either can adapt quickly. The goal is to move away from having … Read moreDart. What’s the point?
Guava’s CacheBuilder provides several options for keeping a cache down to a reasonable size. Entries can expire for multiple reasons, entries can be limited to a certain number, and entries can be made available for garbage collection. These options can be used individually or together. Each is simply one more method call during cache creation. … Read moreKeeping Your Cache Down to Size
Google has released a new version of Guava, and it’s bad news for one of my favorite classes, MapMaker. The exciting feature of MapMaker is its ability to produce an insta-cache, a key-value mapping that calculates values on the fly, expires them, and limits the quantity stored — all while maintaining thread safety. In release … Read moreGoodbye, MapMaker. Hello, CacheBuilder.
A common behaviour of a program, and therefore of my SQL script to replicate the program, is:1) Retrieve some value from reference data2) Use it repeatedly in SQL statements If this reference data differs by environment or by day, this adds a manual step to the SQL script. Here’s a neat trick to save the … Read moreStupid Oracle Tricks #1: SQL substitution variables
I’m currently distracted from life, immersed in Concepts of Modern Mathematics. Did you know that you can find out whether a number is prime by multiplying all the integers before it, adding one, and then dividing by the number of interest? Me neither! it’s like this: a number p is prime if and only if: … Read moreFinding Primes in Haskell
Remember the early days of XML, when people were all excited about using it to wire up applications? “You can change which implementation is used without changing any code!” Sure, right, XML isn’t code. It gets packaged in your jar files, with the code. It controls how your application works, like the code. It breaks … Read moreSpring configuration returns home
Google’s guava library provides a few constructs that let us use functional style in Java. Personally, I enjoy the slightly more declarative style that results, and have a new game of eliminating loops. Unfortunately, it’s Java. Attempting to do anything functionally is rather ugly. What do you think – worth it? or unreadable? Before: public … Read moreGuava: pidgin functional programming in Java
In Professional F# 2.0, an example is given for using an active pattern to match against a struct. The example could be improved. The original: []type Point(x : int, y : int) = member pt.X = x member pt.Y = y override pt.ToString() = System.String.Format(“({0},{1})”, x, y)let newPoint = new Point(0,0)let (|Point|) (x : int, … Read moreA small correction: F# active patterns