In my day job I have written a synchronization primitive that may be of
interest for the proposed concurrent package of the new version of
commons-lang. I first want to check whether there is interest in this
stuff, then I can talk to my employer about the code donation (which
hopefully should not be a problem).
Now to the synchronization primitive: It is a class called "LoadBarrier"
that is somewhat similar to a semaphor in that it allows a configurable
number of locks to be hold. But there is also a timing aspect: The limit
of locks is enforced in a configurable time unit. If a thread requests
another lock when the maximum number of locks is already reached, it
gets blocked until the time unit is over. After that all blocked threads
are freed and can again try to aquire a lock.
The background of this class is that it provides an easy way of
controlling the load produced by a process or enforcing a threashold. In
our use case we had a background process running queries on a database
for statistical evaluations. To ensure that the database load does not
affect the system a LoadBarrier was used that enforced a limit of
database queries per second.
WDYT? If there is interest, I am going to address my employer and then
create a JIRA enhancement ticket.
Oliver
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