All Known Implementing Classes:
    JTAJobRunShellFactory, StdJobRunShellFactory

Responsible for creating the instances of JobRunShell to be used within the QuartzScheduler instance.

Although this interface looks a lot like an 'object pool', implementations do not have to support the re-use of instances. If an implementation does not wish to pool instances, then the borrowJobRunShell() method would simply create a new instance, and the returnJobRunShell method would do nothing.

author: James - House

 public JobRunShell borrowJobRunShell() throws SchedulerException

Called by the org.quartz.core.QuartzSchedulerThread 
to obtain instances of JobRunShell .

 public  void initialize(Scheduler scheduler,
    SchedulingContext schedCtxt) throws SchedulerConfigException

Initialize the factory, providing a handle to the Scheduler
that should be made available within the JobRunShell and
the JobExecutionCOntext s within it, and a handle to the
SchedulingContext that the shell will use in its own
operations with the JobStore.

 public  void returnJobRunShell(JobRunShell jobRunShell)

Called by the org.quartz.core.QuartzSchedulerThread 
to return instances of JobRunShell .