How can I pass selected row id to a commandLink outside a primefaces datatable?

How can I pass selected row id to a commandLink outside a primefaces
datatable?

PF 3.5.11, Mojarra 2.1.20 Omnifaces 1.5 I have primefaces datatable, with
single row selection enabled. Also I have buttons outside of datable which
make some operations on selected row.
I see the following options to pass selected row (id):
use EL-Binding
event on selection with setter
Are there another options ? Link with very nice explanation if buttons are
inside datatable: How can I pass a parameter to a commandLink inside a
datatable?