Enabling retroactive computing through event sourcing
Hauck, Franz J.
FacultyFakultät für Ingenieurwissenschaften, Informatik und Psychologie
InstitutionInstitut für Verteilte Systeme
Resource / media typeAbschlussarbeit (Master; Diplom), Text
Date of first publication2016-09-30
Event sourcing is a style of software architecture wherein state altering operations to an application are captured as immutable events. Each event is appended to an event log, with the current state of a system derived from this series of events. This thesis addresses the utilization of retroactive capabilities in event-sourced systems: computing alternate application states, post hoc bug ﬁxes, or the support of algorithms which have access to their own history, for example. The possibility of retroactively accessing and modifying this event log is a potential capability of an event-sourced system, but a detailed exploration how these operations can be facilitated and supported has not yet been conducted. We examine how retroaction can be applied to event-sourced systems and discuss conceptual considerations. Furthermore, we demonstrate how diﬀerent architectures can be used to provide retroaction and describe the prototypical implementation of an appropriate programming model. These ﬁndings are applied in the Chronograph research project, in order to utilize potential temporal aspects of this platform.
LicenseCC BY 4.0 International