// Start the ConsensusModule running with the given ChangeListener.
//
// This starts a goroutine that drives ticks.
//
// Should only be called once.
func (cm *ConsensusModule) Start(changeListener ChangeListener) error {
cm.mutex.Lock()
defer cm.mutex.Unlock()
if changeListener == nil {
return errors.New("'changeListener' cannot be nil")
}
if cm.ticker != nil {
return ErrAlreadyStartedOnce
}
cm.passiveConsensusModule.SetChangeListener(changeListener)
cm.stopped = false
// Start the ticker goroutine
cm.ticker = util.NewTicker(cm.safeTick, cm.tickerDuration)
return nil
}
func TestTicker(t *testing.T) {
var n int32 = 0
getN := func() int32 {
return atomic.LoadInt32(&n)
}
f := func() {
atomic.AddInt32(&n, 1)
}
ticker := util.NewTicker(f, 10*time.Millisecond)
if getN() != 0 {
t.Fatal(getN())
}
time.Sleep(15 * time.Millisecond)
if getN() != 1 {
t.Fatal(getN())
}
time.Sleep(10 * time.Millisecond)
if getN() != 2 {
t.Fatal(getN())
}
time.Sleep(10 * time.Millisecond)
if getN() != 3 {
t.Fatal(getN())
}
ticker.StopAsync()
time.Sleep(10 * time.Millisecond)
if getN() != 3 {
t.Fatal(getN())
}
}