feature/#12: BaseViewModel 추가

presentation/src/main/java/org/sopt/and/presentation/util/base/BaseViewModel.kt

@@ -0,0 +1,45 @@
+package org.sopt.and.presentation.util.base
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
+
+abstract class BaseViewModel<State: UiState, Event: UiEvent, SideEffect: UiSideEffect>() : ViewModel() {
+
+    private val initialState: State by lazy { createInitialState() }
+    abstract fun createInitialState(): State
+
+    private val _uiState: MutableStateFlow<State> = MutableStateFlow(initialState)
+    val uiState = _uiState.asStateFlow()
+    val currentState: State
+        get() = _uiState.value
+
+    private val _event: MutableSharedFlow<Event> = MutableSharedFlow()
+    val event = _event.asSharedFlow()
+
+    private val _sideEffect: MutableSharedFlow<SideEffect> = MutableSharedFlow()
+    val sideEffect = _sideEffect.asSharedFlow()
+
+    fun setState(reduce: State.() -> State) {
+        _uiState.value = currentState.reduce()
+    }
+
+    open fun setEvent(event: Event) {
+        dispatchEvent(event)
+    }
+
+    private fun dispatchEvent(event: Event) = viewModelScope.launch {
+        handleEvent(event)
+    }
+
+    protected abstract suspend fun handleEvent(event: Event)
+
+    fun setSideEffect(sideEffect: SideEffect) {
+        viewModelScope.launch { _sideEffect.emit(sideEffect) }
+    }
+
+}

presentation/src/main/java/org/sopt/and/presentation/util/base/UiEvent.kt

@@ -0,0 +1,3 @@
+package org.sopt.and.presentation.util.base
+
+interface UiEvent

presentation/src/main/java/org/sopt/and/presentation/util/base/UiSideEffect.kt

@@ -0,0 +1,3 @@
+package org.sopt.and.presentation.util.base
+
+interface UiSideEffect

presentation/src/main/java/org/sopt/and/presentation/util/base/UiState.kt

@@ -0,0 +1,3 @@
+package org.sopt.and.presentation.util.base
+
+interface UiState