private async Task AppendReadingsCollectedEvents(string streamId, DateTime fromDate, int dayCount)
{
IEventStore eventStore = new CosmosEventStore(this, EndpointUrl, AuthorizationKey, DatabaseId);
var stream = await eventStore.LoadStreamAsync(streamId);
// Only append more ReadingsCollected events if we haven't done this before.
// This can be detected by looking at the stream version.
var events = Enumerable.Range(0, dayCount - 1)
.Select(i => new MeterReadingsCollected
{
Date = fromDate.AddDays(i),
Readings = GenerateMeterReadings(fromDate.AddDays(i)).ToArray()
})
.ToList();
await eventStore.AppendToStreamAsync(streamId, stream.Version, events);
// Wait a little while before adding the last one.
// This ensures that the last event will be at a different timestamp
// which is better for explaining the mechanism.
await Task.Delay(TimeSpan.FromSeconds(2));
await eventStore.AppendToStreamAsync(streamId, stream.Version + events.Count, new IEvent[]
{
new MeterReadingsCollected
{
Date = fromDate.AddDays(dayCount - 1),
Readings = GenerateMeterReadings(fromDate.AddDays(dayCount - 1)).ToArray()
}
});
}
public async Task SC02_AppendToExistingStreamAsync()
{
IEventStore eventStore = new CosmosEventStore(this, EndpointUrl, AuthorizationKey, DatabaseId);
var streamId = $"meter:87000001";
var stream = await eventStore.LoadStreamAsync(streamId);
var readingsCollected = new MeterReadingsCollected
{
Date = new DateTime(2020, 4, 30),
Readings = GenerateMeterReadings(new DateTime(2020, 4, 30)).ToArray()
};
var succes = await eventStore.AppendToStreamAsync(
streamId,
stream.Version,
new IEvent[] { readingsCollected });
Assert.IsTrue(succes, "Unexpected stream version encountered.");
}
