Gekko: a metalevel for adaptation in Nexus

We describe the results of an experiment to add support for multimethod communication to the Nexus-Java communications library using metalevel programming techniques. We describe the Nexus architecture and the Java implementation of this architecture. We summarize the technique of metalevel programming, and apply the technique to develop a metalevel for adaptive multimethod communication called Gekko. In addition, we discuss the test environment we use for evaluation of Gekko, and discuss lessons we have learnt in its development.