Toolbox stuff for our business integration project

Since our own Java-client products predate the Toolbox, and the one bit of
server-side Java I've written is simple enough that the ILE RPG program
that calls it just shells out a JAVA command through QCMDEXC call, I've
still never had a reason to use the Toolbox. (The reliance on Host
Servers, which we don't use much around here, didn't exactly help
matters).

So if it seems like I don't know scat about the Toolbox, it's because I
don't. Please be patient with me as I relieve my ignorance.

Question: Is there a way (preferably going through Native
Optimizations/Record Level Access, rather than through a Host Servers
socket connection) to have a Java program go to sleep until either a new
record appears in a database, or a timer runs out, whichever comes first?
Sort of the way an ILE call to the "select()" API can wait on one or more
sockets and a timer, or an ILE C "deq()" or a QRCVDTAQ waits on various
types of OS/400-native queues?

--
JHHL