Elena Lyulina

Elena Lyulina, Mahmoud Jahanshahi

The Open-Source Software community has become the center of attention for many researchers, who are investigating various aspects of collaboration in this extremely large ecosystem. Due to its size, it is difficult to grasp whether or not it has structure, and if so, what it may be. Our hackathon project aims to facilitate the understanding of the developer collaboration structure and relationships among projects based on the bi-graph of what projects developers contribute to by providing an interactive collaboration graph of this ecosystem, using the data obtained from World of Code infrastructure. Our attempts to visualize the entirety of projects and developers were stymied by the inability of the layout and visualization tools to process the exceedingly large scale of the full graph. We used WoC to filter the nodes (developers and projects) and edges (developer contributions to a project) to reduce the scale of the graph that made it amenable to an interactive visualization and published the resulting visualizations. We plan to apply hierarchical approaches to be able to incorporate the entire data in the interactive visualizations and also to evaluate the utility of such visualizations for several tasks.

Anastasiia Birillo, Elena Lyulina, Maria Malysheva et al.

Reflection in Kotlin is a powerful mechanism to introspect program behavior during its execution at run-time. However, among the variety of practical tasks involving reflection, there are scenarios when the poor performance of run-time approaches becomes a significant disadvantage. This problem manifests itself in Kotless, a popular framework for developing serverless applications, because the faster the applications launch, the less their cloud infrastructure costs. In this paper, we present Reflekt - a compile-time reflection library which allows to perform the search among classes, object expressions (which in Kotlin are implemented as singleton classes), and functions in Kotlin code based on the given search query. It comes with a convenient DSL and better performance comparing to the existing run-time reflection approaches. Our experiments show that replacing run-time reflection calls with Reflekt in serverless applications created with Kotless resulted in a significant performance boost in start-up time of these applications.

Elena Lyulina, Anastasiia Birillo, Vladimir Kovalenko et al.

The process of writing code and use of features in an integrated development environment (IDE) is a fruitful source of data in computing education research. Existing studies use records of students' actions in the IDE, consecutive code snapshots, compilation events, and others, to gain deep insight into the process of student programming. In this paper, we present a set of tools for collecting and processing data of student activity during problem-solving. The first tool is a plugin for IntelliJ-based IDEs (PyCharm, IntelliJ IDEA, CLion). By capturing snapshots of code and IDE interaction data, it allows to analyze the process of writing code in different languages -- Python, Java, Kotlin, and C++. The second tool is designed for the post-processing of data collected by the plugin and is capable of basic analysis and visualization. To validate and showcase the toolkit, we present a dataset collected by our tools. It consists of records of activity and IDE interaction events during solution of programming tasks by 148 participants of different ages and levels of programming experience. We propose several directions for further exploration of the dataset.