Created
March 25, 2022 03:09
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Testing IQuerySession in async projections
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public class QuerySessionInProjections : OneOffConfigurationsContext | |
{ | |
private readonly ITestOutputHelper _output; | |
public QuerySessionInProjections(ITestOutputHelper output) | |
{ | |
_output = output; | |
} | |
[Fact] | |
public async Task OnAsyncProjection() | |
{ | |
StoreOptions(_ => { _.Projections.SelfAggregate<SessionProjection>(ProjectionLifecycle.Async); }); | |
var theEvent = new SomeEvent(Guid.NewGuid()); | |
TheSession.Events.StartStream<SessionProjection>(theEvent.Id, theEvent); | |
await TheSession.SaveChangesAsync(); | |
using var daemon = await TheStore.BuildProjectionDaemonAsync(); | |
await daemon.RebuildProjection<SessionProjection>(CancellationToken.None); | |
var asyncResult = await TheSession.Events.AggregateStreamAsync<SessionProjection>(theEvent.Id); | |
_output.WriteLine("Results::"); | |
if (asyncResult is null) | |
{ | |
_output.WriteLine(" Null. Projection doesn't exist."); | |
return; | |
} | |
_output.WriteLine(" Id: {0}", asyncResult.Id); | |
_output.WriteLine(" Connection Valid: {0}", asyncResult.ConnectionIsValid); | |
_output.WriteLine(" Exception details: {0}", asyncResult.ConnectionExceptionDetails); | |
} | |
public record SomeEvent(Guid Id); | |
public record SessionProjection(Guid Id, bool ConnectionIsValid, | |
string ConnectionExceptionDetails) | |
{ | |
public static SessionProjection Create(SomeEvent @event, IQuerySession session) | |
{ | |
var connectionIsValid = false; | |
var connectionExceptionDetails = string.Empty; | |
try | |
{ | |
// Debug here! You will see that the async daemon goes through this method 3 times, with the first 2 times throwing exception inside session.Connection. | |
_ = session.Connection; | |
connectionIsValid = true; | |
} | |
catch (Exception e) | |
{ | |
connectionExceptionDetails = e.ToString(); | |
} | |
return new SessionProjection(@event.Id, connectionIsValid, connectionExceptionDetails); | |
} | |
} | |
} |
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