Meta-Level Architectures and Reflection

Current implementations of re ective Java extensions typically either require access to source code, or require a modi ed Java platform. This makes them unsuitable for applying re ection to Commercialo -the-Shelf (COTS) systems. In order to address this we developed a prototype Java extension Dalang based on class wrapping that worked with compiled code, and was implemented using a standard Java platform. In this paper we evaluate the class wrapper approach, and discuss issues that relate to the transparent application of re ection to COTS systems. This has informed our design of a new version of Dalang called Kava that implements a metaobject protocol through the application of standard byte code transformations. Kava leverages the capabilities of byte code transformation toolkits whilst presenting a high-level abstraction for specifying behavioural changes to Java components.

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