+DiskAction* DiskS19Model::io_start(const DiskImpl* disk, sg_size_t size, s4u::Io::OpType type)
+{
+ auto* action = new DiskS19Action(this, static_cast<double>(size), not disk->is_on());
+ get_maxmin_system()->expand(disk->get_constraint(), action->get_variable(), 1.0);
+ switch (type) {
+ case s4u::Io::OpType::READ:
+ get_maxmin_system()->expand(disk->get_read_constraint(), action->get_variable(), 1.0);
+ break;
+ case s4u::Io::OpType::WRITE:
+ get_maxmin_system()->expand(disk->get_write_constraint(), action->get_variable(), 1.0);
+ break;
+ default:
+ THROW_UNIMPLEMENTED;
+ }
+ const auto& factor_cb = disk->get_factor_cb();
+ if (factor_cb) { // handling disk variability
+ action->set_rate_factor(factor_cb(size, type));
+ }
+ return action;
+}
+