Д.З. по теме Coroutines & Flow

app/src/main/kotlin/ru/otus/coroutineshomework/ui/login/LoginFragment.kt

@@ -11,6 +11,8 @@ import ru.otus.coroutineshomework.databinding.ContentBinding
 import ru.otus.coroutineshomework.databinding.FragmentLoginBinding
 import ru.otus.coroutineshomework.databinding.LoadingBinding
 import ru.otus.coroutineshomework.databinding.LoginBinding
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.launch
 
 class LoginFragment : Fragment() {
 
@@ -39,16 +41,17 @@ class LoginFragment : Fragment() {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-
         setupLogin()
         setupContent()
 
-        loginViewModel.state.observe(viewLifecycleOwner) {
-            when(it) {
-                is LoginViewState.Login -> showLogin(it)
-                LoginViewState.LoggingIn -> showLoggingIn()
-                is LoginViewState.Content -> showContent(it)
-                LoginViewState.LoggingOut -> showLoggingOut()
+        lifecycleScope.launch {
+            loginViewModel.stateFlow.collect { viewState ->
+                when (viewState) {
+                    is LoginViewState.Login -> showLogin(viewState)
+                    LoginViewState.LoggingIn -> showLoggingIn()
+                    is LoginViewState.Content -> showContent(viewState)
+                    LoginViewState.LoggingOut -> showLoggingOut()
+                }
             }
         }
     }

app/src/main/kotlin/ru/otus/coroutineshomework/ui/login/LoginViewModel.kt

@@ -3,25 +3,63 @@ package ru.otus.coroutineshomework.ui.login
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import ru.otus.coroutineshomework.ui.login.data.Credentials
 
 class LoginViewModel : ViewModel() {
 
-    private val _state = MutableLiveData<LoginViewState>(LoginViewState.Login())
-    val state: LiveData<LoginViewState> = _state
+    private val _stateFlow = MutableStateFlow<LoginViewState>(LoginViewState.Login())
+    val stateFlow: StateFlow<LoginViewState> = _stateFlow.asStateFlow()
+    val loginApi = LoginApi()
+
+    fun loginFlow(name: String, password: String) = flow<LoginViewState> {
+        emit(LoginViewState.LoggingIn)
+
+        val credentials = Credentials(name, password)
+
+        try {
+            val user = loginApi.login(credentials)
+            emit(LoginViewState.Content(user))
+        } catch (e: Exception){
+            emit(LoginViewState.Login(e))
+        }
+    }.flowOn(Dispatchers.IO)
+
+    fun logoutFlow() = flow<LoginViewState> {
+        emit(LoginViewState.LoggingOut)
+        loginApi.logout()
+        emit(LoginViewState.Login())
+    }.flowOn(Dispatchers.IO)
 
     /**
      * Login to the network
      * @param name user name
      * @param password user password
      */
     fun login(name: String, password: String) {
-        // TODO: Implement login
+        viewModelScope.launch {
+            loginFlow(name, password).collect {
+                _stateFlow.emit(it)
+            }
+        }
     }
 
     /**
      * Logout from the network
      */
     fun logout() {
-        // TODO: Implement logout
+        viewModelScope.launch {
+            logoutFlow().collect {
+                _stateFlow.emit(it)
+            }
+        }
     }
 }

app/src/main/kotlin/ru/otus/coroutineshomework/ui/network/NetworkViewModel.kt

@@ -4,8 +4,11 @@ import android.util.Log
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
 import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import kotlin.random.Random
 
@@ -18,7 +21,24 @@ class NetworkViewModel : ViewModel() {
     val result: LiveData<Long?> = _result
 
     fun startTest(numberOfThreads: Int) {
-        // TODO: Implement the logic
+        viewModelScope.launch {
+            _running.value = true
+            _result.value = null
+
+            val jobs = List(numberOfThreads) {
+                async { emulateBlockingNetworkRequest() }
+            }
+
+            val successfulTimeList = jobs.mapNotNull { it.await().getOrNull() }
+
+            val averageTime = if (successfulTimeList.isNotEmpty()) {
+                successfulTimeList.average().toLong()
+            } else {
+                0L
+            }
+            _result.value = averageTime
+            _running.value = false
+        }
     }
 
     private companion object {

app/src/main/kotlin/ru/otus/coroutineshomework/ui/timer/TimerFragment.kt

@@ -8,6 +8,7 @@ import androidx.fragment.app.Fragment
 import androidx.lifecycle.lifecycleScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
 import ru.otus.coroutineshomework.databinding.FragmentTimerBinding
@@ -18,6 +19,8 @@ import kotlin.time.Duration.Companion.milliseconds
 
 class TimerFragment : Fragment() {
 
+    private var timerJob: Job? = null
+    private val timeFlow = MutableStateFlow<Duration>(Duration.ZERO)
     private var _binding: FragmentTimerBinding? = null
     private val binding get() = _binding!!
 
@@ -53,12 +56,16 @@ class TimerFragment : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         savedInstanceState?.let {
-            time = it.getLong(TIME).milliseconds
+            timeFlow.value = it.getLong(TIME).milliseconds
             started = it.getBoolean(STARTED)
         }
         setButtonsState(started)
         with(binding) {
-            time.text = this@TimerFragment.time.toDisplayString()
+            lifecycleScope.launch {
+                timeFlow.collect {
+                    time.text = this@TimerFragment.timeFlow.value.toDisplayString()
+                }
+            }
             btnStart.setOnClickListener {
                 started = true
             }
@@ -70,16 +77,21 @@ class TimerFragment : Fragment() {
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
-        outState.putLong(TIME, time.inWholeMilliseconds)
+        outState.putLong(TIME, timeFlow.value.inWholeMilliseconds)
         outState.putBoolean(STARTED, started)
     }
 
     private fun startTimer() {
-        // TODO: Start timer
+        timerJob = viewLifecycleOwner.lifecycleScope.launch {
+            while (true){
+                delay(10)
+                timeFlow.emit(timeFlow.value + 10.milliseconds)
+            }
+        }
     }
 
     private fun stopTimer() {
-        // TODO: Stop timer
+        timerJob?.cancel()
     }
 
     override fun onDestroyView() {