Hi guys,
This is not directly related to Mahout, but since most of you deal with
computations, I think it is relevant and I seek feedback/ improvement ideas.
If you've ever had to create a large array (or worse: multidimensional
array) of a relatively simple structure-like data holder class then you
probably know the pain of initializing sub-arrays and the memory overhead
that jagged arrays incur. The idea to generate stub code to handle such
cases has been around my head for a long time, but I finally managed to find
some time and implement it. I really like the results so far, especially in
multidimensional case the code is so much nicer. Even if you have a
relatively simple array of byte[][] you can do this:
@Struct(dimensions = 2)
public final class Byte {
public byte value;
}
this will generate stub class ByteArray2D (if javac has access to
apt-processor in hppc-struct, that is; or if your maven project is
configured properly, see hppc-examples for how to do this) with a single
byte[] field and flattened Byte objects, including accessors to individual
fields or valuetype-copying methods for handling entire structures. More is
here:
http://issues.carrot2.org/browse/HPPC-54
And a trivial sample here:
https://github.com/carrotsearch/hppc/blob/master/hppc-examples/src/main/java/com/carrotsearch/hppc/examples/StructExample.java
Again, if you have any ideas/ improvements, they are most welcome (use JIRA
above for comments or fork the code on github).
Dawid
