CREST researchers published a paper in IEEE Access Journal
Continuous Integration, Delivery and Deployment: A systematic Review on Approaches, Tools, Challenges and Practices
Mojtaba Shahin, Muhammad Ali Babar, Liming Zhu
Context: Continuous practices, i.e., continuous integration, delivery, and deployment, are the software development industry practices that enable organizations to frequently and reliably release new features and products. With the increasing interest in and literature on continuous practices, it is important to systematically review and synthesize the approaches, tools, challenges, and practices reported for adopting and implementing continuous practices.
Objective: This research aimed at systematically reviewing the state of the art of continuous practices to classify approaches and tools, identify challenges and practices in this regard, and identify the gaps for future research.
Method: We used systematic literature review (SLR) method for reviewing the peer-reviewed papers on continuous practices published between 2004 and 1st June 2016. We applied thematic analysis method for analysing the data extracted from reviewing 69 papers selected using predefined criteria.
Results: We have identified thirty approaches and associated tools, which facilitate the implementation of continuous practices in the following ways: (1) “reducing build and test time in continuous integration (CI)”; (2) “increasing visibility and awareness on build and test results in CI”; (3) “supporting (semi-) automated continuous testing”; (4) “detecting violations, flaws and faults in CI”; (5) “addressing security and scalability issues in deployment pipeline”, and (6) “improving dependability and reliability of deployment process”. We have also determined a list of critical factors such as “testing (effort and time)”, “team awareness and transparency”, “good design principles”, “customer”, “highly skilled and motivated team”, “application domain”, and “appropriate infrastructure” that should be carefully considered when introducing continuous practices in a given organization. The majority of the reviewed papers were validation (34.7%) and evaluation (36.2%) research types. This review also reveals that continuous practices have been successfully applied to both greenfield and maintenance projects.
Conclusion: Continuous practices have become an important area of software engineering research and practice. Whilst the reported approaches, tools, and practices are addressing a wide range of challenges, there are several challenges and gaps which require future research work for:improving the capturing and reporting of contextual information in the studies reporting different aspects of continuous practices; gaining a deep understanding of how software-intensive systems should be (re-) architected to support continuous practices; addressing the lack of knowledge and tools for engineering processes of designing and running secure deployment pipelines.