first implementation
first implementation


Former-commit-id: cd09b2785cc8c9da6ee7a08cff744e76e5ec8e1d [formerly f4f63753056d6e512b522560f110965127981a77]
Former-commit-id: e7f0ba8f880238e4428dda1b80d990a7d7302d4e
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine