Feat: MviViewModel 구현

Author: l5x5l

presentation/src/main/java/com/threegap/bitnagil/presentation/common/mviviewmodel/MviIntent.kt

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+package com.threegap.bitnagil.presentation.common.mviviewmodel
+
+interface MviIntent

presentation/src/main/java/com/threegap/bitnagil/presentation/common/mviviewmodel/MviSideEffect.kt

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+package com.threegap.bitnagil.presentation.common.mviviewmodel
+
+interface MviSideEffect

presentation/src/main/java/com/threegap/bitnagil/presentation/common/mviviewmodel/MviState.kt

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+package com.threegap.bitnagil.presentation.common.mviviewmodel
+
+import android.os.Parcelable
+
+interface MviState : Parcelable

presentation/src/main/java/com/threegap/bitnagil/presentation/common/mviviewmodel/MviViewModel.kt

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+package com.threegap.bitnagil.presentation.common.mviviewmodel
+
+import androidx.lifecycle.SavedStateHandle
+import androidx.lifecycle.ViewModel
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.StateFlow
+import org.orbitmvi.orbit.Container
+import org.orbitmvi.orbit.ContainerHost
+import org.orbitmvi.orbit.syntax.simple.intent
+import org.orbitmvi.orbit.syntax.simple.postSideEffect
+import org.orbitmvi.orbit.syntax.simple.reduce
+import org.orbitmvi.orbit.viewmodel.container
+
+abstract class MviViewModel<STATE : MviState, SIDE_EFFECT : MviSideEffect, INTENT : MviIntent>(
+    private val initState: STATE,
+    private val savedStateHandle: SavedStateHandle,
+) : ContainerHost<STATE, SIDE_EFFECT>, ViewModel() {
+    override val container: Container<STATE, SIDE_EFFECT>
+        get() = container(initialState = initState, savedStateHandle = savedStateHandle)
+
+    val stateFlow: StateFlow<STATE> = container.stateFlow
+
+    val sideEffectFlow: Flow<SIDE_EFFECT> = container.sideEffectFlow
+
+    protected fun sendSideEffect(sideEffect: SIDE_EFFECT) =
+        intent {
+            postSideEffect(sideEffect)
+        }
+
+    protected abstract fun reduceState(intent: INTENT): STATE?
+
+    protected fun sendIntent(intent: INTENT) =
+        intent {
+            val newState = reduceState(intent)
+
+            newState?.let {
+                reduce { newState }
+            }
+        }
+}