The CommonjWorkerMonitorImpl is responsible for dispatching jobs to workers
It wraps CommonJ WorkManager supported by IBM WebSphere and BEA WebLogic sever.
The RenderingJob is responsible for storing all necessary objets for
asynchronous portlet rendering as well as implementing the rendering logic
in its Runnable method.
The WorkerMonitor is responsible for dispatching jobs to workers
It uses an Apache HTTPd configuration style of min/max/spare workers
threads to throttle the rendering work.