Bandwidth Throttling

I'm writing a Bit Torrent Client, Comrade, in java, its pretty far along, mainly doing GUI work. I cannot find any good information on bandwidth throttling techinques. I found unexplained code from limewire.org and the freenet project. I thought I kind of understood it, but it didn't work and just corruptted the data.

Anyone got any ideas or links on bandwidth throttling in java?