ДЗ Coroutines

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

@@ -7,6 +7,8 @@ import android.view.ViewGroup
 import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.viewModels
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.launch
 import ru.otus.coroutineshomework.databinding.ContentBinding
 import ru.otus.coroutineshomework.databinding.FragmentLoginBinding
 import ru.otus.coroutineshomework.databinding.LoadingBinding
@@ -43,12 +45,14 @@ class LoginFragment : Fragment() {
         setupLogin()
         setupContent()
 
-        loginViewModel.state.observe(viewLifecycleOwner) {
-            when(it) {
-                is LoginViewState.Login -> showLogin(it)
-                LoginViewState.LoggingIn -> showLoggingIn()
-                is LoginViewState.Content -> showContent(it)
-                LoginViewState.LoggingOut -> showLoggingOut()
+        viewLifecycleOwner.lifecycleScope.launch {
+            loginViewModel.state.collect {
+                when (it) {
+                    is LoginViewState.Login -> showLogin(it)
+                    LoginViewState.LoggingIn -> showLoggingIn()
+                    is LoginViewState.Content -> showContent(it)
+                    LoginViewState.LoggingOut -> showLoggingOut()
+                }
             }
         }
     }

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

@@ -1,27 +1,60 @@
 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.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.flow
+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 _state = MutableStateFlow<LoginViewState>(LoginViewState.Login())
+    val state: StateFlow<LoginViewState> = _state.asStateFlow()
+
+    fun loginFlow(name: String, password: String): Flow<LoginViewState> = flow {
+        emit(LoginViewState.LoggingIn)
+        try {
+            val user = withContext(Dispatchers.IO) {
+                LoginApi().login(Credentials(name, password))
+            }
+            delay(3000L)
+            emit(LoginViewState.Content(user = user))
+        } catch (e: Exception) {
+            emit(LoginViewState.Login(error = e))
+        }
+    }
 
     /**
      * 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 = name, password = password).collect { viewState ->
+                _state.value = viewState
+            }
+        }
     }
 
     /**
      * Logout from the network
      */
     fun logout() {
-        // TODO: Implement logout
+        viewModelScope.launch {
+            _state.value = LoginViewState.LoggingOut
+            withContext(Dispatchers.IO) {
+                LoginApi().logout()
+            }
+            delay(3000L)
+            _state.value = LoginViewState.Login()
+        }
     }
 }

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 +21,30 @@ class NetworkViewModel : ViewModel() {
     val result: LiveData<Long?> = _result
 
     fun startTest(numberOfThreads: Int) {
-        // TODO: Implement the logic
+        viewModelScope.launch {
+            _running.value = true
+
+            val networkResultsList = mutableListOf<Result<Long>>()
+
+            repeat(numberOfThreads) {
+                val networkResultDef = async {
+                    emulateBlockingNetworkRequest()
+                }
+                networkResultsList.add(networkResultDef.await())
+            }
+
+            var divisor = 0L
+            var time = 0L
+            networkResultsList.forEach { networkResult ->
+                if (networkResult.isSuccess) {
+                    networkResult.map { milliseconds -> time += milliseconds }
+                    divisor += 1
+                }
+            }
+            val averageTime = if (divisor != 0L) time /divisor else 0L
+            _result.value = averageTime
+            _running.value = false
+        }
     }
 
     private companion object {

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

@@ -8,22 +8,22 @@ 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
 import java.util.Locale
 import kotlin.properties.Delegates
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.Duration.Companion.seconds
 
 class TimerFragment : Fragment() {
 
     private var _binding: FragmentTimerBinding? = null
     private val binding get() = _binding!!
 
-    private var time: Duration by Delegates.observable(Duration.ZERO) { _, _, newValue ->
-        binding.time.text = newValue.toDisplayString()
-    }
+    private var timeFlow: MutableStateFlow<Duration> = MutableStateFlow(Duration.ZERO)
 
     private var started by Delegates.observable(false) { _, _, newValue ->
         setButtonsState(newValue)
@@ -34,6 +34,8 @@ class TimerFragment : Fragment() {
         }
     }
 
+    private var timerJob: Job? = null
+
     private fun setButtonsState(started: Boolean) {
         with(binding) {
             btnStart.isEnabled = !started
@@ -52,13 +54,21 @@ class TimerFragment : Fragment() {
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+
         savedInstanceState?.let {
-            time = it.getLong(TIME).milliseconds
+            timeFlow = MutableStateFlow(it.getLong(TIME).milliseconds)
             started = it.getBoolean(STARTED)
         }
+
         setButtonsState(started)
+
+        viewLifecycleOwner.lifecycleScope.launch {
+            timeFlow.collect { duration ->
+                binding.time.text = duration.toDisplayString()
+            }
+        }
+
         with(binding) {
-            time.text = this@TimerFragment.time.toDisplayString()
             btnStart.setOnClickListener {
                 started = true
             }
@@ -70,16 +80,23 @@ 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?.cancel()
+        timerJob = viewLifecycleOwner.lifecycleScope.launch {
+            while (isActive) {
+                delay(1000L)
+                timeFlow.emit(timeFlow.value + 1.seconds)
+            }
+        }
     }
 
     private fun stopTimer() {
-        // TODO: Stop timer
+        timerJob?.cancel()
+        timerJob = null
     }
 
     override fun onDestroyView() {
@@ -94,9 +111,9 @@ class TimerFragment : Fragment() {
         private fun Duration.toDisplayString(): String = String.format(
             Locale.getDefault(),
             "%02d:%02d.%03d",
-            this.inWholeMinutes.toInt(),
-            this.inWholeSeconds.toInt(),
-            this.inWholeMilliseconds.toInt()
+            this.inWholeMinutes,
+            this.inWholeSeconds % 60,
+            this.inWholeMilliseconds % 1000
         )
     }
 }