func (stringSetSuite) TestUninitialized(c *C) { var uninitialized set.Strings c.Assert(uninitialized.Size(), Equals, 0) c.Assert(uninitialized.IsEmpty(), Equals, true) // You can get values and sorted values from an unitialized set. AssertValues(c, uninitialized) // All contains checks are false c.Assert(uninitialized.Contains("foo"), Equals, false) // Remove works on an uninitialized Strings uninitialized.Remove("foo") var other set.Strings // Union returns a new set that is empty but initialized. c.Assert(uninitialized.Union(other), DeepEquals, set.NewStrings()) c.Assert(uninitialized.Intersection(other), DeepEquals, set.NewStrings()) c.Assert(uninitialized.Difference(other), DeepEquals, set.NewStrings()) other = set.NewStrings("foo", "bar") c.Assert(uninitialized.Union(other), DeepEquals, other) c.Assert(uninitialized.Intersection(other), DeepEquals, set.NewStrings()) c.Assert(uninitialized.Difference(other), DeepEquals, set.NewStrings()) c.Assert(other.Union(uninitialized), DeepEquals, other) c.Assert(other.Intersection(uninitialized), DeepEquals, set.NewStrings()) c.Assert(other.Difference(uninitialized), DeepEquals, other) // Once something is added, the set becomes initialized. uninitialized.Add("foo") AssertValues(c, uninitialized, "foo") }
func (w *minUnitsWatcher) merge(serviceNames *set.Strings, change watcher.Change) error { serviceName := change.Id.(string) if change.Revno == -1 { delete(w.known, serviceName) serviceNames.Remove(serviceName) return nil } doc := minUnitsDoc{} if err := w.st.minUnits.FindId(serviceName).One(&doc); err != nil { return err } revno, known := w.known[serviceName] w.known[serviceName] = doc.Revno if !known || doc.Revno > revno { serviceNames.Add(serviceName) } return nil }