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DebuggingCoroutinesViewModel.kt
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DebuggingCoroutinesViewModel.kt
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package com.lukaslechner.coroutineusecasesonandroid.usecases.coroutines.usecase9
import androidx.lifecycle.viewModelScope
import com.lukaslechner.coroutineusecasesonandroid.base.BaseViewModel
import com.lukaslechner.coroutineusecasesonandroid.mock.MockApi
import com.lukaslechner.coroutineusecasesonandroid.utils.addCoroutineDebugInfo
import kotlinx.coroutines.*
import timber.log.Timber
class DebuggingCoroutinesViewModel(
private val api: MockApi = mockApi()
) : BaseViewModel<UiState>() {
fun performSingleNetworkRequest() {
uiState.value = UiState.Loading
// This property needs to be set so that the coroutine name is printed when logging Thread.currentName()
// System.setProperty("kotlinx.coroutines.debug", if (BuildConfig.DEBUG) "on" else "off")
// It is set in [CoroutineUsecasesOnAndroidApplication]
viewModelScope.launch(CoroutineName("Initial Coroutine")) {
Timber.d(addCoroutineDebugInfo("Initial coroutine launched"))
try {
val recentVersions = api.getRecentAndroidVersions()
Timber.d(addCoroutineDebugInfo("Recent Android Versions returned"))
uiState.value = UiState.Success(recentVersions)
} catch (exception: Exception) {
Timber.d(addCoroutineDebugInfo("Loading recent Android Versions failed"))
uiState.value = UiState.Error("Network Request failed")
}
// Perform two calculations in parallel
val calculation1Deferred =
async(CoroutineName("Calculation1")) { performCalculation1() }
val calculation2Deferred =
async(CoroutineName("Calculation2")) { performCalculation2() }
Timber.d(addCoroutineDebugInfo("Result of Calculation1: ${calculation1Deferred.await()}"))
Timber.d(addCoroutineDebugInfo("Result of Calculation2: ${calculation2Deferred.await()}"))
}
}
private suspend fun performCalculation1() = withContext(Dispatchers.Default) {
Timber.d(addCoroutineDebugInfo("Starting Calculation1"))
delay(1000)
Timber.d(addCoroutineDebugInfo("Calculation1 completed"))
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}
private suspend fun performCalculation2() = withContext(Dispatchers.Default) {
Timber.d(addCoroutineDebugInfo("Starting Calculation2"))
delay(2000)
Timber.d(addCoroutineDebugInfo("Calculation2 completed"))
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}
}