func (stringSetSuite) TestUninitialized(c *gc.C) {
var uninitialized set.Strings
c.Assert(uninitialized.Size(), gc.Equals, 0)
c.Assert(uninitialized.IsEmpty(), gc.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"), gc.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), gc.DeepEquals, set.NewStrings())
c.Assert(uninitialized.Intersection(other), gc.DeepEquals, set.NewStrings())
c.Assert(uninitialized.Difference(other), gc.DeepEquals, set.NewStrings())
other = set.NewStrings("foo", "bar")
c.Assert(uninitialized.Union(other), gc.DeepEquals, other)
c.Assert(uninitialized.Intersection(other), gc.DeepEquals, set.NewStrings())
c.Assert(uninitialized.Difference(other), gc.DeepEquals, set.NewStrings())
c.Assert(other.Union(uninitialized), gc.DeepEquals, other)
c.Assert(other.Intersection(uninitialized), gc.DeepEquals, set.NewStrings())
c.Assert(other.Difference(uninitialized), gc.DeepEquals, other)
// Once something is added, the set becomes initialized.
uninitialized.Add("foo")
AssertValues(c, uninitialized, "foo")
}
func (w *actionWatcher) merge(changes *set.Strings, updates map[interface{}]bool) error {
for id, exists := range updates {
if id, ok := id.(string); ok {
if exists {
changes.Add(id)
} else {
changes.Remove(id)
}
} else {
return fmt.Errorf("id is not of type string")
}
}
return nil
}
// merge cleans up the pending changes to account for actionId's being
// removed before this watcher consumes them, and to account for the slight
// potential overlap between the inital actionIds pending before the watcher
// starts, and actionId's the watcher detects
func (w *actionWatcher) merge(changes, initial set.Strings, updates map[interface{}]bool) error {
for id, exists := range updates {
switch id := id.(type) {
case string:
if exists {
if !initial.Contains(id) {
changes.Add(id)
}
} else {
changes.Remove(id)
}
default:
return errors.Errorf("id is not of type string, got %T", id)
}
}
return nil
}
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
}