%T A Debugger for Communicating Scala Objects
%A  Andrew Bate,  Gavin Lowe
%E Peter H. Welch,  Frederick R. M. Barnes,  Kevin Chalmers,  Jan Bækgaard Pedersen,  Adam T. Sampson
%B Communicating Process Architectures 2012
%X This paper presents a software tool for visualising and
   reasoning about
the behaviour of message\-passing concurrent
   programs built with the CSO
library for the Scala
   programming language. It describes the models
needed to
   represent the construction of process networks and the
   runtime
behaviour of the resulting program. We detail the
   manner in which
information is extracted from the use of
   concurrency primitives in order
to maintain these models and
   how these models are diagrammed. Our
implementation of
   dynamic deadlock detection is explained. The tool
   can
produce a sequence diagram of process communications,
   the communication
network depicting the pairs of processes
   which share a communication
channel, and the trees resulting
   from the composition of processes.
Furthermore, it allows
   for behavioural specifications to be defined and
then
   checked at runtime, and guarantees to detect the illegal
   usage of
concurrency primitives that could otherwise lead to
   deadlock or data
loss. Our implementation imposes only a
   small overhead on the program
under inspection.