The AsyncLatch is an asynchronous latch.
Allows resources to register their handlers to be invoked when service is closing.
A simple, lock-free, non-blocking ring buffer.
A Proc is a process that can receive messages.
Implements a com.twitter.util.Timer in terms of a org.jboss.netty.util.Timer.
ExitGuard prevents the process from exiting normally by use of a nondaemon thread whenever there is at least one guarder.
Load a singleton class in the manner of java.util.ServiceLoader.