Design a Print Job Queue

Problem

Design an object-oriented print spooler / job queue.

Requirements

• Submit, cancel, prioritize print jobs
• Multiple printers, dispatch to a free one
• Job states: queued, printing, done, failed

What evaluators look for

• Clean classes: Job, Printer, Spooler, Scheduler
• Priority and fairness
• Retry on failure

Extension

Add per-printer capabilities (color/duplex) and route jobs accordingly.