public async Task AggregationWithWhenShouldGetTheCurrentState()
{
var invoiceId = Guid.NewGuid();
var invoiceInitiated = new InvoiceInitiated(
invoiceId,
34.12,
"INV/2021/11/01",
new Person("Oscar the Grouch", "123 Sesame Street"),
DateTime.UtcNow
);
var invoiceIssued = new InvoiceIssued(
invoiceId,
"Cookie Monster",
DateTime.UtcNow
);
var invoiceSent = new InvoiceSent(
invoiceId,
InvoiceSendMethod.Email,
DateTime.UtcNow
);
theSession.Events.Append(invoiceId, invoiceInitiated, invoiceIssued, invoiceSent);
await theSession.SaveChangesAsync();
#region sample_aggregate-stream-usage
var invoice = await theSession.Events.AggregateStreamAsync <Invoice>(invoiceId);
#endregion
invoice.ShouldNotBeNull();
invoice.Id.ShouldBe(invoiceInitiated.InvoiceId);
invoice.Amount.ShouldBe(invoiceInitiated.Amount);
invoice.Number.ShouldBe(invoiceInitiated.Number);
invoice.Status.ShouldBe(InvoiceStatus.Sent);
invoice.IssuedTo.ShouldBe(invoiceInitiated.IssuedTo);
invoice.InitiatedAt.ShouldBe(invoiceInitiated.InitiatedAt);
invoice.IssuedBy.ShouldBe(invoiceIssued.IssuedBy);
invoice.IssuedAt.ShouldBe(invoiceIssued.IssuedAt);
invoice.SentVia.ShouldBe(invoiceSent.SentVia);
invoice.SentAt.ShouldBe(invoiceSent.SentAt);
}
public void AggregationWithWhenShouldGetTheCurrentState()
{
var invoiceInitiated = new InvoiceInitiated(
34.12,
"INV/2021/11/01",
new Person("Oscar the Grouch", "123 Sesame Street"),
DateTime.UtcNow
);
var invoiceIssued = new InvoiceIssued(
"Cookie Monster",
DateTime.UtcNow
);
var invoiceSent = new InvoiceSent(
InvoiceSendMethod.Email,
DateTime.UtcNow
);
// 1. Get all events and sort them in the order of appearance
var events = new object[] { invoiceInitiated, invoiceIssued, invoiceSent };
// 2. Construct empty Invoice object
var invoice = new Invoice();
// 3. Apply each event on the entity.
foreach (var @event in events)
{
invoice.When(@event);
}
invoice.Id.Should().Be(invoiceInitiated.Number);
invoice.Amount.Should().Be(invoiceInitiated.Amount);
invoice.Number.Should().Be(invoiceInitiated.Number);
invoice.Status.Should().Be(InvoiceStatus.Sent);
invoice.IssuedTo.Should().Be(invoiceInitiated.IssuedTo);
invoice.InitiatedAt.Should().Be(invoiceInitiated.InitiatedAt);
invoice.IssuedBy.Should().Be(invoiceIssued.IssuedBy);
invoice.IssuedAt.Should().Be(invoiceIssued.IssuedAt);
invoice.SentVia.Should().Be(invoiceSent.SentVia);
invoice.SentAt.Should().Be(invoiceSent.SentAt);
}
private void Apply(InvoiceSent @event)
{
SentVia = @event.SentVia;
SentAt = @event.SentAt;
Status = InvoiceStatus.Sent;
}
