public static ItemCreated Handle(
// This would be the message
CreateItemCommand command,
// Any other arguments are assumed
// to be service dependencies
ItemsDbContext 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);
// This event being returned
// by the handler will be automatically sent
// out as a "cascading" message
return(new ItemCreated
{
Id = item.Id
});
}
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 Task <ItemCreated> Create([FromBody] CreateItemCommand command)
{
// Using Jasper as a Mediator, and receive the
// expected response from Jasper
return(_bus.Invoke <ItemCreated>(command));
}
public Task Create([FromBody] CreateItemCommand command)
{
// Using Jasper as a Mediator
return(_bus.Invoke(command));
}