Riven :: code </> brain :: dump

I found an odd bug that seems to be related with the new Java7 optimisations regarding StringBuilder concatenation. The following code works...

This is a simple bash script that allows you to add (multiple) port-knocking rules into iptables. Usage is explained below. KNOCK_NAME =$1 ...

Those tutorials explaining reverse SSH tunnels are ambiguous at best in their examples, often using the same port number twice, making it un...

Continuations, or green threads, are a concept mostly seen in scripting languages. Green threads are just like native threads, but you can r...

It got cold while she called for juice from , not awaiting the tide and tied a tight knot. A scene never seen again, maybe missed due to th...

A simple optimization to the gradient function makes the noise function twice as fast. PerlinNoise.grad() inline float grad(int hash, flo...

Because the ClassShutter in Rhino doesn't usually provide enough information to make decisions on whether or not certain Java objects, ...

public class Functional { /** * Consumes (removes) all items while iterating */ public static <T> Iterable<T> ...

public interface Operator { public void operate(T item); } public class Functional { /** * Performs a callback on each element-...

public interface Transformer <I, O> { public O transform(I item); } public class Functional { /** * Transforms Iterable...

Functional programming has its strengths when iterating over data. If you want a view on a subset data, you can make a filter, and iterate ...

For any reasonably sized Histogram, you probably want to look at this Histogram class based on a HashMap . However, if your histograms are t...

Direct ByteBuffers can have an unexpected massive overhead. For every allocation, a number of bytes equal to the system pagesize (typically...

Delaying security dialogs in Java until you need them, is a bit harder than it should be. By default, the dialog appears before the first li...

It's a nightmare to find the code to create animated GIFs in Java. Once you found it, you notice you can't set the frame disposal, a...

public static BufferedImage readTGA (File file) throws IOException { if (!file.exists()) throw new FileNotFoundException(f...

Calling Math.floor() simply takes too long. The problem with optimizing is that you can't simply cast the floatingpoint number to an int...

If you would believe Google, everybody is searching for code that reads the dimensions of an image,without loading all those colorful pixels...

THIS WAS FUN. Proved the math teacher wrong. public class Graycode { public static int normalToGray (int orig) { int gray =...

Everybody should have these. It's just a drag to rewrite it time and time again. public class SetUtil { public static <T> Se...

The point of this class is to pre-calculate the sort-order in advance, so that we're not comparing objects all the time, and then do a p...

public class Histogram <T> { private final Map<T, Integer> map; public Histogram () { this.map = new HashMap<...

   private final static Unsafe unsafe; private static long addressOffset; private static long positionOffset; ...

If you want to monitor CPU usage, per thread, things couldn't get easier! ThreadGroupMonitor gmonitor = new ThreadGroupMonitor(); whi...

So you have this pluggable stuff, and you want to support realtime loading of new classes. That's not so hard, but what if old classes t...