func newStringsHandlerWorker(c *gc.C, setupError, handlerError, teardownError error) (*stringsHandler, worker.Worker) {
sh := &stringsHandler{
actions: nil,
handled: make(chan []string, 1),
setupError: setupError,
teardownError: teardownError,
handlerError: handlerError,
watcher: &testStringsWatcher{
changes: make(chan []string),
},
setupDone: make(chan struct{}),
}
w := legacy.NewStringsWorker(sh)
select {
case <-sh.setupDone:
case <-time.After(coretesting.ShortWait):
c.Error("Failed waiting for stringsHandler.Setup to be called during SetUpTest")
}
return sh, w
}
// NewMinUnitsWorker returns a Worker that runs service.EnsureMinUnits()
// if the number of alive units belonging to a service decreases, or if the
// minimum required number of units for a service is increased.
func NewMinUnitsWorker(st *state.State) worker.Worker {
mu := &MinUnitsWorker{st: st}
return legacy.NewStringsWorker(mu)
}