/
CalculationInSeveralCoroutinesViewModel.kt
49 lines (42 loc) 路 1.58 KB
/
CalculationInSeveralCoroutinesViewModel.kt
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package com.lukaslechner.coroutineusecasesonandroid.usecases.coroutines.usecase12
import androidx.lifecycle.viewModelScope
import com.lukaslechner.coroutineusecasesonandroid.base.BaseViewModel
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import java.math.BigInteger
import kotlin.system.measureTimeMillis
class CalculationInSeveralCoroutinesViewModel(
private val factorialCalculator: FactorialCalculator = FactorialCalculator(),
private val defaultDispatcher: CoroutineDispatcher = Dispatchers.Default
) : BaseViewModel<UiState>() {
fun performCalculation(
factorialOf: Int,
numberOfCoroutines: Int
) {
uiState.value = UiState.Loading
viewModelScope.launch {
var factorialResult = BigInteger.ZERO
val computationDuration = measureTimeMillis {
factorialResult =
factorialCalculator.calculateFactorial(
factorialOf,
numberOfCoroutines
)
}
var resultString = ""
val stringConversionDuration = measureTimeMillis {
resultString = convertToString(factorialResult)
}
uiState.value =
UiState.Success(resultString, computationDuration, stringConversionDuration)
}
}
private suspend fun convertToString(
number: BigInteger
): String =
withContext(defaultDispatcher) {
number.toString()
}
}