undo
Undoes (cancels) another expression referred by its tag.
pdef = Ruote.process_definition do
concurrence do
alpha :tag => 'kilroy'
undo :ref => 'kilroy'
end
end
This example is rather tiny, but it shows a process branch (undo) cancelling
another (alpha).
cancel
This expression is aliased to ‘cancel’
cancel :ref => 'invoicing_stage'
a bit shorter
It’s OK to shorten
cancel :ref => 'invoicing_stage'
to
cancel 'invoicing_stage'
kill
kill :ref => 'invoicing stage'
will cancel the target expression and bypass any on_cancel handler set for
it.
concurrence do
sequence :tag => 'x', :on_cancel => 'y' do
# ...
end
sequence do
# ...
kill 'x'
end
end
In this example the :on_cancel => ‘y’ will get ignored if kill ‘x’ kicks
in.