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Instant Search using Kotlin Coroutines/Flows with Single Source of Truth (SSOT)
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| import androidx.lifecycle.ViewModel | |
| import androidx.lifecycle.viewModelScope | |
| import kotlinx.coroutines.Dispatchers | |
| import kotlinx.coroutines.delay | |
| import kotlinx.coroutines.flow.MutableStateFlow | |
| import kotlinx.coroutines.flow.SharingStarted | |
| import kotlinx.coroutines.flow.StateFlow | |
| import kotlinx.coroutines.flow.catch | |
| import kotlinx.coroutines.flow.debounce | |
| import kotlinx.coroutines.flow.distinctUntilChanged | |
| import kotlinx.coroutines.flow.flatMapLatest | |
| import kotlinx.coroutines.flow.flow | |
| import kotlinx.coroutines.flow.flowOf | |
| import kotlinx.coroutines.flow.flowOn | |
| import kotlinx.coroutines.flow.stateIn | |
| import kotlinx.coroutines.flow.update | |
| class SearchViewModel : ViewModel() { | |
| private val _searchQuery = MutableStateFlow("") | |
| val searchQuery: StateFlow<String> = _searchQuery | |
| val searchResults: StateFlow<List<String>> = _searchQuery | |
| .debounce(300L) | |
| .distinctUntilChanged() | |
| .flatMapLatest { query -> | |
| if (query.isBlank()) { | |
| flowOf(emptyList()) | |
| } else { | |
| fetchSearchResults(query) | |
| .catch { emit(emptyList()) } | |
| } | |
| } | |
| .flowOn(Dispatchers.IO) | |
| .stateIn( | |
| scope = viewModelScope, | |
| started = SharingStarted.WhileSubscribed(5_000L), | |
| initialValue = emptyList() | |
| ) | |
| fun onSearchQueryChange(query: String) { | |
| _searchQuery.update { query } | |
| } | |
| private fun fetchSearchResults(query: String) = flow { | |
| delay(3_000L) | |
| emit( | |
| listOf( | |
| "Result 1 for $query", | |
| "Result 2 for $query", | |
| "Result 3 for $query", | |
| "Result 4 for $query", | |
| "Result 5 for $query" | |
| ) | |
| ) | |
| } | |
| } |
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