public async Task <WidgetDto> CreateWidget(WidgetDto dto)
{
var entity = new Domain.Widget()
{
Text = dto.Text,
Width = dto.Width,
Height = dto.Height
};
// user initiated transaction with retry strategy set needs to execute in new strategy
var strategy = db.Database.CreateExecutionStrategy();
await strategy.ExecuteAsync(async() => {
// need a transaction and 2 savechanges so that I have the id for the widget in the event
using (var tx = await db.Database.BeginTransactionAsync().ConfigureAwait(false)) {
try {
db.Widgets.Add(entity);
await db.SaveChangesAsync().ConfigureAwait(false);
var @event = new WidgetStageChangedEvent()
{
WidgetId = entity.WidgetId, Text = entity.Text, Width = entity.Width, Height = entity.Height, Timestamp = DateTime.UtcNow
};
await publisher.PublishAsync(@event).ConfigureAwait(false);
await db.SaveChangesAsync().ConfigureAwait(false);
await tx.CommitAsync().ConfigureAwait(false);
} catch (Exception ex) {
logger.LogError(ex, "unhandled exception");
await tx.RollbackAsync().ConfigureAwait(false);
throw;
}
}
});
return(ToWidgetDto(entity));
}
public async Task Handle(AddWidget request, CancellationToken cancellationToken)
{
var widget = new Domain.Widget
{
Name = request.Name
};
await this.DataService.Insert(widget);
}
private WidgetDto ToWidgetDto(Domain.Widget entity)
{
return(new WidgetDto()
{
WidgetId = entity.WidgetId,
Text = entity.Text,
Width = entity.Width,
Height = entity.Height
});
}
