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Improve the robustness of the ROMs auto-refresh feature

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This commit is contained in:
lynxnb 2023-04-27 00:31:00 +02:00
parent e6efaf26bc
commit 24d4f5e3cd
1 changed files with 25 additions and 11 deletions
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36
app/src/main/java/emu/skyline/MainViewModel.kt
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@ -4,18 +4,18 @@ import android.app.Application
import android.content.Context
import android.net.Uri
import android.util.Log
import androidx.lifecycle.*
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.viewModelScope
import dagger.hilt.android.lifecycle.HiltViewModel
import dagger.hilt.android.qualifiers.ApplicationContext
import emu.skyline.loader.AppEntry
import emu.skyline.loader.RomFormat
import emu.skyline.utils.fromFile
import emu.skyline.utils.toFile
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import java.io.File
import java.util.*
import javax.inject.Inject
sealed class MainState {
@ -42,7 +42,8 @@ class MainViewModel @Inject constructor(@ApplicationContext context : Context, p
* @param loadFromFile If this is false then trying to load cached adapter data is skipped entirely
*/
fun loadRoms(context : Context, loadFromFile : Boolean, searchLocation : Uri, systemLanguage : Int) {
if (state == MainState.Loading) return
if (state == MainState.Loading)
return
state = MainState.Loading
val romsFile = File(getApplication<SkylineApplication>().filesDir.canonicalPath + "/roms.bin")
@ -51,6 +52,7 @@ class MainViewModel @Inject constructor(@ApplicationContext context : Context, p
if (loadFromFile && romsFile.exists()) {
try {
state = MainState.Loaded(fromFile(romsFile))
checkRomHash(searchLocation, systemLanguage)
return@launch
} catch (e : Exception) {
Log.w(TAG, "Ran into exception while loading: ${e.message}")
@ -58,7 +60,6 @@ class MainViewModel @Inject constructor(@ApplicationContext context : Context, p
}
state = if (searchLocation.toString().isEmpty()) {
@Suppress("ReplaceWithEnumMap")
MainState.Loaded(ArrayList())
} else {
try {
@ -74,18 +75,31 @@ class MainViewModel @Inject constructor(@ApplicationContext context : Context, p
}
}
/**
* Tracks whether an auto refresh is already in progress
*/
private var isAutoRefreshingRoms = false
/**
* This checks if the roms have changed since the last time they were loaded and if so it reloads them
*/
fun checkRomHash(searchLocation : Uri, systemLanguage : Int) {
if(state !is MainState.Loaded) return
CoroutineScope(Dispatchers.IO).launch {
val currentHash = (state as MainState.Loaded).items.hashCode()
// Skip if an auto refresh is already in progress or if the state hasn't already loaded
if (isAutoRefreshingRoms || state !is MainState.Loaded)
return
isAutoRefreshingRoms = true
viewModelScope.launch(Dispatchers.IO) {
val currentHash = when (val currentState = state) {
is MainState.Loaded -> currentState.items.hashCode()
else -> 0
}
val romElements = romProvider.loadRoms(searchLocation, systemLanguage)
val newHash = romElements.hashCode()
if (newHash != currentHash) {
if (newHash != currentHash)
state = MainState.Loaded(romElements)
}
isAutoRefreshingRoms = false
}
}
}