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  1. Camille Teruel. Adaptability and Encapsulation in Dynamically-Typed Languages: Taming Reflection and Extension Methods. Ph.D. thesis, Université Lille 1 - France, 2016. PDF 
    Abstract

    Users expect modern software to be both continually available and updated on the fly. Introduction of new features and integration of bug fixes should not trouble the smooth running of an application. Developers also benefit from dynamic modifications of software, e.g. they can adapt code to new unanticipated situations or they can run dynamic analyses to get feedback about the behavior of running applications for monitoring, debugging and optimization purposes. Programming languages and their runtimes should thus provides developers with mechanisms that improve software adaptability. At the same time, the increasing size and complexity of software call for applications made up of many interacting components developed by different parties. In this context, either all components are trusted or each component needs to be properly protected from other ones. For example, a plugin should not be able to manipulate the internal structures or leaks private data of its host application unrestrictedly. Likewise, a malicious library should not be able to corrupt its clients or interfere with their operations. Programming languages should thus provide developers with mechanisms that improve software isolation, such as encapsulation and custom access control policies. The need for dynamic adaptations that can change nearly every aspect of an application on the one hand and the need for properly confined components on the other hand pulls programming language design in two opposite directions: ei- ther more flexibility or more control. This dissertation studies this tension in the context of dynamically-typed object-oriented languages with two language mechanisms that promote software adaptability: reflection and extension methods. For both mechanisms, we demonstrate their usefulness, their harmful effect on encap- sulation and propose solutions to retain their power while maintaining encapsulation.