public void REGISTER_PROJECTIONS()
{
var appendStore = new FileAppendOnlyStore( @"C:\Users\wydev\Documents\GitHub\Clones\lokad-iddd-sample\DomainTests\Store\");
var eventStore = new EventStore(appendStore);
var publisher = new DomainEventPublisher(eventStore,0,500);
var store = new FileDocumentReaderWriter<CustomerId,CustomerTransactions>(@"C:\Users\wydev\Documents\GitHub\Clones\lokad-iddd-sample\DomainTests\Store\",
new ViewStrategy(@"C:\Users\wydev\Documents\GitHub\Clones\lokad-iddd-sample\DomainTests\Views\"));
IDocumentWriter<CustomerId,CustomerTransactions> writer = store;
var projection = new CustomerTransactionsProjection(writer);
publisher.RegisterProjection(projection);
var id = new CustomerId(2);
var @event = new CustomerCreated
{
Id = id,
Name = "Microsoft",
Currency = Currency.Eur
};
IList<IEvent> Changes = new List<IEvent>();
Changes.Add(@event);
eventStore.AppendToStream(id,0,Changes);
publisher.ProcessNewEvents();
}
// method with direct call, as illustrated in the IDDD Book
// Step 1: LockCustomerForAccountOverdraft method of
// Customer Application Service is called
public void LockCustomerForAccountOverdraft(CustomerId customerId, string comment)
{
// Step 2.1: Load event stream for Customer, given its id
var stream = _eventStore.LoadEventStream(customerId);
// Step 2.2: Build aggregate from event stream
var customer = new Customer(stream.Events);
// Step 3: call aggregate method, passing it arguments and pricing domain service
customer.LockForAccountOverdraft(comment, _pricingService);
// Step 4: commit changes to the event stream by id
_eventStore.AppendToStream(customerId, stream.Version, customer.Changes);
}
public void Create(CustomerId id, string name, Currency currency, IPricingService service)
{
if (_state.Created)
throw new InvalidOperationException("Customer was already created");
Apply(new CustomerCreated
{
Created = DateTime.UtcNow,
Name = name,
Id = id,
Currency = currency
});
var bonus = service.GetWelcomeBonus(currency);
AddPayment("Welcome bonus", bonus);
}
public void Create(CustomerId id, string name, Currency currency, IPricingService service)
{
if (_state.Created)
{
throw new InvalidOperationException("Customer was already created");
}
Apply(new CustomerCreated
{
Created = DateTime.UtcNow,
Name = name,
Id = id,
Currency = currency
});
var bonus = service.GetWelcomeBonus(currency);
AddPayment("Welcome bonus", bonus);
}
void Update(CustomerId id, Action<Customer> execute)
{
// Load event stream from the store
EventStream stream = _eventStore.LoadEventStream(id);
// create new Customer aggregate from the history
Customer customer = new Customer(stream.Events);
// execute delegated action
execute(customer);
// append resulting changes to the stream
_eventStore.AppendToStream(id, stream.Version, customer.Changes);
}
// Sample of method that would apply simple conflict resolution.
// see IDDD book or Greg's videos for more in-depth explanation
void UpdateWithSimpleConflictResolution(CustomerId id, Action<Customer> execute)
{
while (true)
{
EventStream eventStream = _eventStore.LoadEventStream(id);
Customer customer = new Customer(eventStream.Events);
execute(customer);
try
{
_eventStore.AppendToStream(id, eventStream.Version, customer.Changes);
return;
}
catch (OptimisticConcurrencyException ex)
{
foreach (var clientEvent in customer.Changes)
{
foreach (var actualEvent in ex.ActualEvents)
{
if (ConflictsWith(clientEvent, actualEvent))
{
var msg = string.Format("Conflict between {0} and {1}",
clientEvent, actualEvent);
throw new RealConcurrencyException(msg, ex);
}
}
}
// there are no conflicts and we can append
_eventStore.AppendToStream(id, ex.ActualVersion, customer.Changes);
}
}
}
