Beispiel #1
0
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")
}
Beispiel #2
0
func (w *actionWatcher) loop() error {
	var (
		changes set.Strings
		in      <-chan watcher.Change = w.source
		out     chan<- []string       = w.sink
	)

	w.st.watcher.WatchCollectionWithFilter(w.st.actions.Name, w.source, w.filterFn)
	defer w.st.watcher.UnwatchCollection(w.st.actions.Name, w.source)

	initial, err := w.initial()
	if err != nil {
		return err
	}
	changes = initial

	for {
		select {
		case <-w.tomb.Dying():
			return tomb.ErrDying
		case <-w.st.watcher.Dead():
			return stateWatcherDeadError(w.st.watcher.Err())
		case ch := <-in:
			updates, ok := collect(ch, in, w.tomb.Dying())
			if !ok {
				return tomb.ErrDying
			}
			if err := w.merge(changes, initial, updates); err != nil {
				return err
			}
			if !changes.IsEmpty() {
				out = w.sink
			} else {
				out = nil
			}
		case out <- changes.Values():
			changes = set.NewStrings()
			out = nil
		}
	}
}