Initializing ThreadWork
Each ThreadWorker instance can expect to have its
initializeThreadWork() method called once by the framework before
any actual work is performed. This method may be implemented to do any setup necessary
for that thread's execution, most commonly output files opened, or variables
initialized.
Warning: It is very important that any setup necessary to execute a
WorkUnit, including accessing batch parameters, is done here and
not in the creation of JobWork. There is no guarantee that static
variables set at the time of the JobWork creation will be available at
this time. The framework may be calling ThreadWork in a different
process from the creation of JobWork.