add a game exampe for chain_of_responsibility

behavior/06_chain_of_responsibility/responsibility_chain_game_test.go

@@ -0,0 +1,75 @@
+package chain
+
+import "testing"
+
+type GameType int
+
+const (
+	TypeFPS GameType = 1
+	TypeRPG          = TypeFPS << 1
+)
+
+type Game interface {
+	Type() GameType
+	Start(player string)
+}
+
+// chain of responsibility
+type GameSelector struct {
+	GameList []Game
+}
+
+func (g *GameSelector) AddGame(games ...Game) {
+	g.GameList = append(g.GameList, games...)
+}
+
+func (g GameSelector) Start(t GameType, player string) {
+	for _, v := range g.GameList {
+		if v.Type() == t {
+			v.Start(player)
+			return
+		}
+	}
+}
+
+type FPSGame struct {
+	t GameType
+}
+
+func (f FPSGame) Start(player string) {
+	println(player, "join in fps game")
+}
+
+func (f FPSGame) Type() GameType {
+	return f.t
+}
+
+type RPGGame struct {
+	t GameType
+}
+
+func (RPGGame) Start(player string) {
+	println(player, "join in rpg game")
+}
+
+func (r RPGGame) Type() GameType {
+	return r.t
+}
+
+func TestChainsOfResponsibilityInGame(t *testing.T) {
+	fps := FPSGame{TypeFPS}
+	rpg := RPGGame{TypeRPG}
+
+	sl := GameSelector{}
+	sl.AddGame(fps, rpg)
+
+	player := "icg"
+	sl.Start(TypeRPG, player)
+	println()
+	sl.Start(TypeFPS, player)
+	// output:
+	/*
+		icg join in rpg game
+		icg join in fps game
+	*/
+}