public async Task Create([FromBody] CreateItemCommand command)
{
// Start the "Outbox" transaction
await _messaging.EnlistInTransaction(_db);
// Create a new Item entity
var item = new Item
{
Name = command.Name
};
// Add the item to the current
// DbContext unit of work
_db.Items.Add(item);
// Publish an event to anyone
// who cares that a new Item has
// been created
var @event = new ItemCreated
{
Id = item.Id
};
// Because the message context is enlisted in an
// "outbox" transaction, these outgoing messages are
// held until the ongoing transaction completes
await _messaging.Send(@event);
// Commit the unit of work. This will persist
// both the Item entity we created above, and
// also a Jasper Envelope for the outgoing
// ItemCreated message
await _db.SaveChangesAsync();
// After the DbContext transaction succeeds, kick out
// the persisted messages in the context "outbox"
await _messaging.SendAllQueuedOutgoingMessages();
}
public void Handle(ItemCreated @event)
{
Console.WriteLine("You created a new item with id " + @event.Id);
}