CoroutinesHomework

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

@@ -7,6 +7,10 @@ import android.view.ViewGroup
 import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.viewModels
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import kotlinx.coroutines.launch
 import ru.otus.coroutineshomework.databinding.ContentBinding
 import ru.otus.coroutineshomework.databinding.FragmentLoginBinding
 import ru.otus.coroutineshomework.databinding.LoadingBinding
@@ -43,12 +47,16 @@ 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 {
+            viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                loginViewModel.state.collect { state ->
+                    when(state) {
+                        is LoginViewState.Login -> showLogin(state)
+                        LoginViewState.LoggingIn -> showLoggingIn()
+                        is LoginViewState.Content -> showContent(state)
+                        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.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.catch
+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 _state = MutableStateFlow<LoginViewState>(LoginViewState.Login())
+    val state: StateFlow<LoginViewState> = _state.asStateFlow()
+    private val loginApi = LoginApi()
 
     /**
      * 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 { viewState ->
+                _state.value = viewState
+            }
+        }
     }
 
+    private fun loginFlow(name: String, password: String): Flow<LoginViewState> = flow {
+        emit(LoginViewState.LoggingIn)
+        val user = loginApi.login(Credentials(name, password))
+        emit(LoginViewState.Content(user))
+    }.catch { e ->
+        emit(LoginViewState.Login(error = e as? Exception))
+    }.flowOn(Dispatchers.IO)
+
     /**
      * Logout from the network
      */
     fun logout() {
-        // TODO: Implement logout
+        viewModelScope.launch {
+            _state.value = LoginViewState.LoggingOut
+            try {
+                withContext(Dispatchers.IO) {
+                    loginApi.logout()
+                }
+                _state.value = LoginViewState.Login()
+            } catch (e: Exception) {
+                _state.value = LoginViewState.Login(error = e)
+            }
+        }
     }
-}
+}

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

@@ -4,8 +4,12 @@ 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.awaitAll
 import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import kotlin.random.Random
 
@@ -18,7 +22,29 @@ class NetworkViewModel : ViewModel() {
     val result: LiveData<Long?> = _result
 
     fun startTest(numberOfThreads: Int) {
-        // TODO: Implement the logic
+        viewModelScope.launch {
+            _running.value = true
+            _result.value = null
+
+            try {
+                val tasks = (1..numberOfThreads).map {
+                    async {
+                        emulateBlockingNetworkRequest()
+                    }
+                }
+
+                val results = tasks.awaitAll()
+
+                val successTimes = results.mapNotNull { it.getOrNull() }
+                if (successTimes.isNotEmpty()) {
+                    _result.value = successTimes.average().toLong()
+                }
+            } catch (e: Exception) {
+                Log.e(TAG, "Test failed", e)
+            } finally {
+                _running.value = false
+            }
+        }
     }
 
     private companion object {

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

@@ -5,9 +5,12 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
 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
@@ -21,9 +24,7 @@ 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 val timeFlow = MutableStateFlow(Duration.ZERO)
 
     private var started by Delegates.observable(false) { _, _, newValue ->
         setButtonsState(newValue)
@@ -53,33 +54,47 @@ class TimerFragment : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         savedInstanceState?.let {
-            time = it.getLong(TIME).milliseconds
+            val savedMs = it.getLong(TIME)
+            timeFlow.value = savedMs.milliseconds
             started = it.getBoolean(STARTED)
         }
         setButtonsState(started)
-        with(binding) {
-            time.text = this@TimerFragment.time.toDisplayString()
-            btnStart.setOnClickListener {
-                started = true
-            }
-            btnStop.setOnClickListener {
-                started = false
+        viewLifecycleOwner.lifecycleScope.launch {
+            viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                timeFlow.collect { duration ->
+                    binding.time.text = duration.toDisplayString()
+                }
             }
         }
+        with(binding) {
+            btnStart.setOnClickListener { started = true }
+            btnStop.setOnClickListener { started = false }
+        }
     }
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
-        outState.putLong(TIME, time.inWholeMilliseconds)
+        outState.putLong(TIME, timeFlow.value.inWholeMilliseconds)
         outState.putBoolean(STARTED, started)
     }
 
+    private var timerJob: Job? = null
+
     private fun startTimer() {
-        // TODO: Start timer
+        timerJob?.cancel()
+        timerJob = viewLifecycleOwner.lifecycleScope.launch {
+            val startTimestamp = System.currentTimeMillis() - timeFlow.value.inWholeMilliseconds
+
+            while (isActive) {
+                delay(10)
+                val currentMs = System.currentTimeMillis() - startTimestamp
+                timeFlow.emit(currentMs.milliseconds)
+            }
+        }
     }
 
     private fun stopTimer() {
-        // TODO: Stop timer
+        timerJob?.cancel()
     }
 
     override fun onDestroyView() {
@@ -91,12 +106,14 @@ class TimerFragment : Fragment() {
         private const val TIME = "time"
         private const val STARTED = "started"
 
-        private fun Duration.toDisplayString(): String = String.format(
-            Locale.getDefault(),
-            "%02d:%02d.%03d",
-            this.inWholeMinutes.toInt(),
-            this.inWholeSeconds.toInt(),
-            this.inWholeMilliseconds.toInt()
-        )
+        private fun Duration.toDisplayString(): String {
+            return String.format(
+                Locale.getDefault(), "%02d:%02d.%03d",
+                inWholeMinutes % 60,
+                inWholeSeconds % 60,
+                inWholeMilliseconds % 1000
+
+            )
+        }
     }
 }