public CompatibilityVersionHandlerTests()
{
_schemaMigrationDataStore = Substitute.For <ISchemaDataStore>();
var collection = new ServiceCollection();
collection.Add(sp => new CompatibilityVersionHandler(_schemaMigrationDataStore)).Singleton().AsSelf().AsImplementedInterfaces();
ServiceProvider provider = collection.BuildServiceProvider();
_mediator = new Mediator(type => provider.GetService(type));
_cancellationToken = new CancellationTokenSource().Token;
}
public async Task ExecuteAsync(SchemaInformation schemaInformation, string instanceName, CancellationToken cancellationToken)
{
EnsureArg.IsNotNull(schemaInformation, nameof(schemaInformation));
_logger.LogInformation($"Polling started at {Clock.UtcNow}");
while (!cancellationToken.IsCancellationRequested)
{
try
{
using IServiceScope scope = _serviceProvider.CreateScope();
ISchemaDataStore schemaDataStore = scope.ServiceProvider.GetRequiredService <ISchemaDataStore>();
int?previous = schemaInformation.Current;
schemaInformation.Current = await schemaDataStore.UpsertInstanceSchemaInformationAsync(instanceName, schemaInformation, cancellationToken).ConfigureAwait(false);
// If there was a change in the schema version and this isn't the base schema
if (schemaInformation.Current != previous && schemaInformation.Current > 0)
{
var isFullSchemaSnapshot = previous == 0;
await _mediator.NotifySchemaUpgradedAsync((int)schemaInformation.Current, isFullSchemaSnapshot).ConfigureAwait(false);
}
await schemaDataStore.DeleteExpiredInstanceSchemaAsync(cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
// The job failed.
_logger.LogError(ex, "Unhandled exception in the worker.");
}
try
{
await Task.Delay(TimeSpan.FromSeconds(_sqlServerDataStoreConfiguration.SchemaOptions.JobPollingFrequencyInSeconds), cancellationToken).ConfigureAwait(false);
}
catch (OperationCanceledException) when(cancellationToken.IsCancellationRequested)
{
// Cancel requested.
break;
}
}
}
public CurrentVersionHandler(ISchemaDataStore schemaMigrationDataStore)
{
EnsureArg.IsNotNull(schemaMigrationDataStore, nameof(schemaMigrationDataStore));
_schemaDataStore = schemaMigrationDataStore;
}
public CompatibilityVersionHandler(ISchemaDataStore schemaDataStore)
{
EnsureArg.IsNotNull(schemaDataStore, nameof(schemaDataStore));
_schemaDataStore = schemaDataStore;
}