+---------------+ | Change Source |----->----+ +---------------+ | Changes | +---------------+ v | Change Source |----->----+ +---------------+ v +-----+-------+ | | v v +-----------+ +-----------+ | Scheduler | | Scheduler | +-----------+ +-----------+ | | | +------+---------+ +---+ +-----+ | | | | v | | Build : : : v v : Request : : : : | : ---- : : : | : ---- : : ---- : | +======+ +======+ : v : | | : : v v : : +---------+ +---------+ :queue : | Builder | | Builder | +======+ +---------+ +---------+ | v +---------+ | Builder | +---------+