Tuesday, August 18, 2009

Building Tokyo Cabinet for use with Java on OS X

I've been really interested in playing with Tokyo Cabinet lately. I thought that it would be fun to take a hack at the GitHub Contest using Scala and Tokyo Cabinet. I then set out to build Tokyo Cabinet and its Java bindings (since I can call those easily from Scala). The Java bindings for Tokyo Cabinet are not pure Java, they use JNI, so you need to compile some C as well as Java. Everything looked fine and dandy until I tried to run some code. I then ran into this stack trace from Scala:

To translate, what is going on here is that by default Tokyo Cabinet will build a 32 bit binaries. Java 1.6 on OS X is 64 bit and will look for a 64 bit version of the library. Here is what I did to make things happy.

When running the configure script for Tokyo Cabinet itself, I added a flag:

I tried the same trick when configuring the Java bindings, but it didn't seem to end up in the resulting Makefile. So I edited the Makefile by hand. In the end, my CFLAGS line looks like this:

After that, I was able to get a small Scala script to create a Hash database.

As an aside, the Scala IDE for Eclipse seems really nice. I had tried it out a few months ago, and it has clearly made a lot of progress since then.


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The problem isdominical costa rica tours that vectors and strings have variable length. When I pass a void* (my object) to Tokyo Cabinet so it can store it, I also have to pass the size of the object in bytes. But that can't be trivially done.
What is the best way to determine the number of bytes of an object? Or what is the best way to store variable length objects in Tokyo Cabinet.

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