A3: Documentation
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@ -14,11 +14,6 @@ const (
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west
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)
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//definiert die nächste Richtung in der Reihenfolge north -> east -> south -> west -> north ...
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func nextDirection(direction CardinalDirection) CardinalDirection {
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return (direction + 1) % (west + 1)
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}
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func (direction CardinalDirection) String() string {
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return [...]string{"North", "East", "South", "West"}[direction]
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}
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@ -56,6 +51,7 @@ func getAxisChannel(direction CardinalDirection) chan string {
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return eastWestChannel
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}
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//Channel für Kommunikation zur rechts folgendem TrafficLight erhalten.
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func getNextChannel(direction CardinalDirection) chan string {
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if direction == north || direction == east {
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return northEastChannel
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@ -66,6 +62,7 @@ func getNextChannel(direction CardinalDirection) chan string {
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func main() {
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var quitChannel = make(chan string)
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//starten der Routinen
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go TrafficLight(north)
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go TrafficLight(south)
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go TrafficLight(east)
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@ -77,24 +74,28 @@ func main() {
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func TrafficLight(direction CardinalDirection) {
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var colour = red
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//warten bis handover ausgelöst wurde wenn Osten/Westen
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if direction == east || direction == west {
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select {
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case <-getNextChannel(direction):
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}
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}
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//Dauerschleife
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for {
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show(direction, colour)
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show(direction, colour) //Zustand zeigen
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if colour == red {
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sync("wait", direction)
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handover("changeDirection", direction)
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if colour == red { //wenn zu rot gewechselt wurde
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sync("wait", direction) //synchronisieren
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handover("changeDirection", direction) //Nächstfolgende Ampel auslösen, warten bis diese fertig durchgelaufen ist.
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}
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sync("changeLight"+nextColour(colour).String(), direction)
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colour = nextColour(colour)
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sync("changeLight", direction) //synchronisieren
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colour = nextColour(colour) //Ampel umschalten
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}
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}
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//der Routine für die rechts folgende Richtung eine Nachricht senden.
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//erst wenn eine Nachricht der linken Routine empfangen wird, wird fortgefahren.
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func handover(message string, direction CardinalDirection) {
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getNextChannel(direction) <- message
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@ -104,6 +105,7 @@ func handover(message string, direction CardinalDirection) {
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}
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//mit der Routine für die gegenüberliegende Ampel synchronisieren.
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func sync(message string, direction CardinalDirection) {
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select {
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@ -113,6 +115,7 @@ func sync(message string, direction CardinalDirection) {
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}
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//zeigen des aktuellen Zustands.
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func show(direction CardinalDirection, colour Colour) {
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fmt.Println(direction.String(), " : ", colour.String())
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}
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