Yea! My first gem ever released!
[YUCK! It was a disaster in a few ways! Don't look at this! It's hideous! There's a new jruby_producer_consumer gem on gemcutter that is slightly different from this in that it works. Ignore the stuff below.]
[In working on a threaded JRuby-based MARC-to-Solr project, I realized that my threading stuff was...ugly. [...]