private async Task Subtask(ProfilerThread Thread)
{
await Task.Delay(rnd.Next(10, 1000));
Thread.Start();
Thread.NewState("A");
await Task.Delay(rnd.Next(10, 1000));
Thread.NewState("B");
await Task.Delay(rnd.Next(10, 1000));
Thread.NewState("C");
await Task.Delay(rnd.Next(10, 1000));
Thread.NewState("D");
await Task.Delay(rnd.Next(10, 1000));
Thread.Stop();
}
/// <inheritdoc />
public async Task TryRepairDatabase(ProfilerThread Thread)
{
if (await this.uiDispatcher.DisplayAlert(AppResources.DatabaseIssue, AppResources.DatabaseCorruptInfoText, AppResources.RepairAndContinue, AppResources.ContinueAnyway))
{
string method = "Delete database file(s) and create new empty database";
try
{
Thread?.NewState("Delete");
// 3. Delete and create a new empty database
Directory.Delete(dataFolder, true);
Thread?.NewState("Recreate");
this.databaseProvider = await CreateDatabaseFile();
Thread?.NewState("Repair3");
await this.databaseProvider.RepairIfInproperShutdown(string.Empty);
// If we had to repair, we must register the provider 'again', as one hasn't been provided yet.
if (!Database.HasProvider)
{
method = $"{nameof(Database)}.{nameof(Database.Register)}";
Database.Register(databaseProvider, false);
}
// All is good.
this.SetState(StorageState.Ready);
}
catch (Exception e3)
{
e3 = Log.UnnestException(e3);
Thread?.Exception(e3);
// Delete and create new failed. We're out of options.
this.logService.LogException(e3, this.GetClassAndMethod(MethodBase.GetCurrentMethod(), method));
Thread?.NewState("DisplayAlert2");
await this.uiDispatcher.DisplayAlert(AppResources.DatabaseIssue, AppResources.DatabaseRepairFailedInfoText, AppResources.Ok);
}
}
}
private async Task PerformStartup(bool isResuming)
{
ProfilerThread thread = this.startupProfiler?.MainThread.CreateSubThread("AppStartup", ProfilerThreadType.Sequential);
thread?.Start();
try
{
thread?.NewState("Report");
await this.SendErrorReportFromPreviousRun();
thread?.NewState("Startup");
ProfilerThread sdkStartupThread = this.startupProfiler?.CreateThread("SdkStartup", ProfilerThreadType.Sequential);
sdkStartupThread?.Start();
sdkStartupThread?.NewState("DB");
this.sdk.UiDispatcher.IsRunningInTheBackground = false;
// Start the db.
// This is for soft restarts.
// If this is a cold start, this call is made already in the App ctor, and this is then a no-op.
this.sdk.StorageService.Init(sdkStartupThread);
StorageState dbState = await this.sdk.StorageService.WaitForReadyState();
if (dbState == StorageState.NeedsRepair)
{
await this.sdk.StorageService.TryRepairDatabase(sdkStartupThread);
}
if (!isResuming)
{
await this.CreateOrRestoreConfiguration();
}
sdkStartupThread?.NewState("Network");
await this.sdk.NetworkService.Load(isResuming);
sdkStartupThread?.NewState("Load");
await this.sdk.NeuronService.Load(isResuming);
sdkStartupThread?.NewState("Timer");
TimeSpan initialAutoSaveDelay = Constants.Intervals.AutoSave.Multiply(4);
this.autoSaveTimer = new Timer(async _ => await AutoSave(), null, initialAutoSaveDelay, Constants.Intervals.AutoSave);
sdkStartupThread?.Stop();
thread?.NewState("Navigation");
await this.sdk.NavigationService.Load(isResuming);
thread?.NewState("Cache");
await this.imageCacheService.Load(isResuming);
thread?.NewState("Orchestrators");
await this.contractOrchestratorService.Load(isResuming);
await this.thingRegistryOrchestratorService.Load(isResuming);
}
catch (Exception e)
{
e = Waher.Events.Log.UnnestException(e);
thread?.Exception(e);
this.DisplayBootstrapErrorPage(e.Message, e.StackTrace);
}
thread?.Stop();
this.StartupCompleted("StartupProfile.uml", false);
}
private async Task InitializeAsync(ProfilerThread Thread)
{
string createDbMethod = $"{nameof(FilesProvider)}.{nameof(FilesProvider.CreateAsync)}()";
string method = null;
Thread?.Start();
try
{
Thread?.NewState("Provider");
// 1. Try create database
method = createDbMethod;
this.databaseProvider = await CreateDatabaseFile();
Thread?.NewState("Repair");
method = nameof(FilesProvider.RepairIfInproperShutdown);
await this.databaseProvider.RepairIfInproperShutdown(string.Empty);
}
catch (Exception e1)
{
e1 = Log.UnnestException(e1);
Thread?.Exception(e1);
// Create failed.
this.logService.LogException(e1, this.GetClassAndMethod(MethodBase.GetCurrentMethod(), method));
try
{
Thread?.NewState("Repair2");
// 2. Try repair database
if (this.databaseProvider is null && Database.HasProvider)
{
// This is an attempt that _can_ work.
// During a soft restart, there _may_ be a provider registered already. If so, grab it.
this.databaseProvider = Database.Provider as FilesProvider;
}
if (this.databaseProvider is null)
{
// Reasoning: If we can't create a provider, and the database doesn't have one assigned either, we're in serious trouble.
// Throw an exception, which is caught below, to try and perform a recovery.
const string message = "Database does not have a provider, and one cannot be created because the Database file(s) are locked. Catch 22.";
method = createDbMethod;
throw new InvalidOperationException(message);
}
method = nameof(FilesProvider.RepairIfInproperShutdown);
await this.databaseProvider.RepairIfInproperShutdown(string.Empty);
}
catch (Exception e2)
{
e2 = Log.UnnestException(e2);
Thread?.Exception(e2);
// Repair failed
this.logService.LogException(e2, this.GetClassAndMethod(MethodBase.GetCurrentMethod(), method));
}
}
try
{
Thread?.NewState("Register");
if (databaseProvider != null)
{
method = $"{nameof(Database)}.{nameof(Database.Register)}";
Database.Register(databaseProvider, false);
// All is good.
this.SetState(StorageState.Ready);
}
else
{
this.SetState(StorageState.NeedsRepair);
}
}
catch (Exception e)
{
e = Log.UnnestException(e);
Thread?.Exception(e);
this.logService.LogException(e, this.GetClassAndMethod(MethodBase.GetCurrentMethod(), method));
this.SetState(StorageState.NeedsRepair);
}
finally
{
Thread?.Stop();
}
}