Module Transition_handler

Catchup_scheduler defines a process which schedules catchup jobs and monitors them for invalidation. This allows the transition frontier controller to handle out of order transitions without spinning up and tearing down catchup jobs constantly. The Catchup_scheduler must receive notifications whenever a new transition is added to the transition frontier so that it can determine if any pending catchup jobs can be invalidated. When catchup jobs are invalidated, the catchup scheduler extracts all of the invalidated catchup jobs and spins up a process to materialize breadcrumbs from those transitions, which will write the breadcrumbs back into the processor as if catchup had successfully completed.

Generic caching library

This module contains the transition processor. The transition processor is * the thread in which transitions are attached the to the transition frontier. * * Two types of data are handled by the transition processor: validated external transitions * with precomputed state hashes (via the block producer and validator pipes) * and breadcrumb rose trees (via the catchup pipe).