%T Integrating and Extending JCSP
%A Peter H. Welch, Neil C.C. Brown, James Moores, Kevin Chalmers, Bernhard H.C. Sputh
%E Alistair A. McEwan, Steve Schneider, Wilson Ifill, Peter H. Welch
%B Communicating Process Architectures 2007
%X This paper presents the extended and re\-integrated JCSP
library of CSP packages for Java. It integrates the
differing advances made by Quickstone\[rs]s JCSP Network
Edition and the "core" library maintained
at Kent. A more secure API for connecting networks and
manipulating channels is provided, requiring significant
internal re\-structuring. This mirrors developments in the
occam\-pi language for mandated direction specifiers on
channel\-ends. For JCSP, promoting the concept of
channel\-ends to first\-class entities has both semantic
benefit (the same as for occampi) and increased safety.
Major extensions include alting barriers (classes supporting
external choice over multiple multi\-way synchronisations),
channel output guards (straightforward once we have the
alting barriers), channel poisoning (for the safe and simple
termination of networks or sub\-networks) and extended
rendezvous on channel communications (that simplify the
capture of several useful synchronisation design patterns).
Almost all CSP systems can now be directly captured with the
new JCSP. The new library is available under the LGPL open
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