Defining Software Architecture Modalities Based on Event Sourcing Architecture Pattern

The main focus of this paper is the development of data-intensive systems. One of the key issues is maintaining consistency while being able to promptly process frequent data requests. The central premise is that CQRS (Command Query Responsibility Segregation) and Event sourcing concepts can be utilized for addressing these challenges. To ensure the development of a system that would be capable of executing the immense number of required operations, yet at the same time provide the desired reliability, a software architecture (combining CQRS, Event sourcing, and the Service Fabric) is proposed based on a real-life project. Furthermore, several modalities of the architecture are defined to be used in different scenarios, depending on the volume of data that is to be processed. The presented modalities of the described software architecture were then implemented as a part of the information system that supports the organization and grading of exams for an immense number of candidates. Consequently, a large volume of data is generated, and the proposed architecture has proven best suited for reporting purposes which will be described in this paper.