We have a bunch of tomcat servers running job. Jobs are triggered by a external scheduler and run anywhere from minutes to hours.

We need to introduce continuous delivery to these servers. The operations team also want to include scheduled restarts of these servers to include windows maintenance.

What architectural design principles can we apply to allow tomcat and OS restarts without interfering with the jobs. Tomcat/OS must not be restarted when jobs are executing.

I am think this cannot be done unless Tomcat is itself responsible for its restart, so that it triggers its own restart when it is done processing a job, but before the next is started.