#13 [Feat] : 추가 State, Event, SideEffect 공통 관리를 위한 BaseViewModel 생성

app/src/main/java/org/sopt/and/presentation/core/BaseViewModel.kt

@@ -0,0 +1,38 @@
+package org.sopt.and.presentation.core
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
+
+abstract class BaseViewModel<State : UiState, SideEffect : UiSideEffect, Event : UiEvent> :
+    ViewModel() {
+
+    private val initialState: State by lazy { createInitialState() }
+    abstract fun createInitialState(): State
+
+    private val _uiState = MutableStateFlow(initialState)
+    val uiState: StateFlow<State> = _uiState.asStateFlow()
+
+    private val _sideEffect = MutableSharedFlow<SideEffect>()
+    val sideEffect: SharedFlow<SideEffect> = _sideEffect.asSharedFlow()
+
+    fun setState(reduce: State.() -> State) {
+        _uiState.value = _uiState.value.reduce()
+    }
+
+    fun setSideEffect(builder: () -> SideEffect) {
+        viewModelScope.launch { _sideEffect.emit(builder()) }
+    }
+
+    fun setEvent(event: Event) {
+        viewModelScope.launch { handleEvent(event) }
+    }
+
+    protected abstract suspend fun handleEvent(event: Event)
+}