RAA - join

Join-Patterns for Ruby implements the Join-Calculus as in JoCaml (http://pauillac.inria.fr/jocaml/) in Ruby.

Uses tuplespace.rb.

Is great for synchronizing concurrent calls, and
should work easily with dRuby (not tested).

Example on defining a counter:

# ...
js.let_def "count! n | inc ()" do
send "count!", @n+1
reply_to "inc"
end

js.let_def "count! n | get ()" do
send "count!", @n
reply_to "get", @n
end

# initialize counter with 4
js.send "count!", 4


# now you can increment from everywhere

js.send "inc"
js.send "inc"

p (js.send "get") # => 6

##########

The same in JoCaml:

let def count! n | inc () = count (n+1) | reply to inc

or count! n | get () = count n | reply to get ;;