Abstract

Visualizing, testing and debugging distributed systems is a challenging task that is not well ad- dressed by conventional software tools. OverView, an event-based Eclipse plug-in that provides runtime visualization of systems running on distributed Java virtual machines is presented. In the same way that the coding and debugging tools in Eclipse make writing software more accessible by visually representing both a program's static components: packages, classes, and interfaces, as well as a program's dynamic components: objects, threads, and invocation stacks; OverView in- tends to make distributed systems more accessible to programmers by creating an analogous visual workspace with appropriate abstractions for distributed component naming, state, location, remote communication, and migration. Overview is a generic visualization framework that uses an Entity Specification Language (ESL) to enable developers to map high-level concurrency and distribution abstractions into lower-level Java threads, network connections and objects.

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