5단계 - 자동차 경주(리팩터링)

src/main/kotlin/racingcar/view/store/CarGroupStore.kt

@@ -2,20 +2,4 @@ package racingcar.view.store
 
 import racingcar.domain.CarGroup
 
-object CarGroupStore : Store<CarGroup>() {
-    private var carGroup = CarGroup(cars = listOf())
-
-    override fun getState(): CarGroup {
-        return this.carGroup
-    }
-
-    override fun setState(state: CarGroup) {
-        this.carGroup = state
-        this.listeners.forEach { listener -> listener() }
-    }
-
-    override fun subscribe(listener: Listener): UnSubscribe {
-        this.listeners.add(listener)
-        return { this.listeners.remove(listener) }
-    }
-}
+object CarGroupStore : Store<CarGroup>(initialState = CarGroup(cars = listOf()))

src/main/kotlin/racingcar/view/store/RoundStore.kt

@@ -2,20 +2,4 @@ package racingcar.view.store
 
 import racingcar.domain.Round
 
-object RoundStore : Store<List<Round>>() {
-    private var rounds = listOf<Round>()
-
-    override fun getState(): List<Round> {
-        return this.rounds
-    }
-
-    override fun setState(state: List<Round>) {
-        this.rounds = state
-        this.listeners.forEach { listener -> listener() }
-    }
-
-    override fun subscribe(listener: Listener): UnSubscribe {
-        this.listeners.add(listener)
-        return { this.listeners.remove(listener) }
-    }
-}
+object RoundStore : Store<List<Round>>(initialState = listOf())

src/main/kotlin/racingcar/view/store/Store.kt

@@ -3,10 +3,19 @@ package racingcar.view.store
 typealias Listener = () -> Unit
 typealias UnSubscribe = () -> Unit
 
-abstract class Store<T> {
-    protected val listeners = HashSet<Listener>()
+open class Store<T>(initialState: T) {
+    private var state = initialState
+    private val listeners = HashSet<Listener>()
 
-    abstract fun getState(): T
-    abstract fun setState(state: T)
-    abstract fun subscribe(listener: Listener): UnSubscribe
+    fun getState(): T {
+        return this.state
+    }
+    fun setState(state: T) {
+        this.state = state
+        this.listeners.forEach { listener -> listener() }
+    }
+    fun subscribe(listener: Listener): UnSubscribe {
+        listeners.add(listener)
+        return { listeners.remove(listener) }
+    }
 }

src/test/kotlin/racingcar/view/store/StoreTest.kt

@@ -32,20 +32,4 @@ class StoreTest : FunSpec({
     }
 })
 
-object CarNameStore : Store<CarName>() {
-    private var carName = CarName(value = "")
-
-    override fun getState(): CarName {
-        return this.carName
-    }
-
-    override fun subscribe(listener: Listener): UnSubscribe {
-        this.listeners.add(listener)
-        return { listeners.remove(listener) }
-    }
-
-    override fun setState(state: CarName) {
-        this.carName = state
-        listeners.forEach { listener -> listener() }
-    }
-}
+object CarNameStore : Store<CarName>(initialState = CarName(value = "동구"))