private async Task SaveChanges <T>(
EventStoreDbContext context,
Guid sourceId,
CancellationToken cancellationToken)
where T : class, IEventSourced
{
try
{
await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
}
catch (DbUpdateException exception)
when(exception.InnerException is UpdateException)
{
var updateException = (UpdateException)exception.InnerException;
Correlation correlation = updateException
.StateEntries
.Select(s => s.Entity)
.OfType <Correlation>()
.FirstOrDefault();
if (correlation != null)
{
throw new DuplicateCorrelationException(
typeof(T),
sourceId,
correlation.CorrelationId,
exception);
}
throw;
}
}
private async Task PublishEvents(
Guid sourceId,
CancellationToken cancellationToken)
{
using (EventStoreDbContext context = _dbContextFactory.Invoke())
{
List <PendingEvent> pendingEvents = await context
.PendingEvents
.Where(e => e.AggregateId == sourceId)
.OrderBy(e => e.Version)
.ToListAsync(cancellationToken)
.ConfigureAwait(false);
List <Envelope> envelopes = pendingEvents
.Select(e => RestoreEnvelope(e))
.ToList();
if (envelopes.Any() == false)
{
return;
}
await _messageBus.SendBatch(envelopes, cancellationToken).ConfigureAwait(false);
context.PendingEvents.RemoveRange(pendingEvents);
await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
}
}
private async Task SaveChanges <T>(
EventStoreDbContext context,
Guid sourceId,
Guid?correlationId,
CancellationToken cancellationToken)
where T : class, IEventSourced
{
try
{
using (IDbContextTransaction transaction = await
context.Database.BeginTransactionAsync(cancellationToken).ConfigureAwait(false))
{
await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
transaction.Commit();
}
}
catch (DbUpdateException exception) when(correlationId.HasValue)
{
IQueryable <Correlation> query = from c in context.Correlations
where c.AggregateId == sourceId && c.CorrelationId == correlationId
select c;
if (await query.AnyAsync().ConfigureAwait(false))
{
throw new DuplicateCorrelationException(
typeof(T),
sourceId,
correlationId.Value,
exception);
}
throw;
}
}
private static async Task RemoveEvents(
EventStoreDbContext context,
List <PendingEvent> pendingEvents,
CancellationToken cancellationToken)
{
foreach (PendingEvent pendingEvent in pendingEvents)
{
try
{
context.PendingEvents.Remove(pendingEvent);
await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
}
catch (DbUpdateConcurrencyException)
{
context.Entry(pendingEvent).State = EntityState.Detached;
}
}
}
public async Task FlushPendingEvents_absorbs_exception_caused_by_that_some_pending_event_already_deleted_since_loaded()
{
// Arrange
var completionSource = new TaskCompletionSource <bool>();
IMessageBus messageBus = new AwaitingMessageBus(completionSource.Task);
var fixture = new Fixture();
FakeUser user = fixture.Create <FakeUser>();
user.ChangeUsername(fixture.Create(nameof(user.Username)));
var eventStore = new SqlEventStore(CreateDbContext, _serializer);
await eventStore.SaveEvents <FakeUser>(user.FlushPendingEvents());
var sut = new SqlEventPublisher(CreateDbContext, _serializer, messageBus);
// Act
Func <Task> action = async() =>
{
Task flushTask = sut.FlushPendingEvents(user.Id, CancellationToken.None);
using (EventStoreDbContext db = CreateDbContext())
{
List <PendingEvent> pendingEvents = await db
.PendingEvents
.Where(e => e.AggregateId == user.Id)
.OrderBy(e => e.Version)
.Take(1)
.ToListAsync();
db.PendingEvents.RemoveRange(pendingEvents);
await db.SaveChangesAsync();
}
completionSource.SetResult(true);
await flushTask;
};
// Assert
action.ShouldNotThrow();
using (EventStoreDbContext db = CreateDbContext())
{
(await db.PendingEvents.AnyAsync(e => e.AggregateId == user.Id))
.Should().BeFalse("all pending events should be deleted");
}
}
private static async Task RemoveEvents(
EventStoreDbContext context,
List <PendingEvent> pendingEvents,
CancellationToken cancellationToken)
{
foreach (PendingEvent pendingEvent in pendingEvents)
{
try
{
context.PendingEvents.Remove(pendingEvent);
await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
}
#if NETSTANDARD2_0
catch (DbUpdateConcurrencyException)
#else
catch (DbUpdateConcurrencyException exception)
when(exception.InnerException is OptimisticConcurrencyException)
#endif
{
context.Entry(pendingEvent).State = EntityState.Detached;
}
}
}
private async Task SaveChanges <T>(
EventStoreDbContext context,
Guid sourceId,
Guid?correlationId,
CancellationToken cancellationToken)
where T : class, IEventSourced
{
#if NETSTANDARD2_0
try
{
using (IDbContextTransaction transaction = await
context.Database.BeginTransactionAsync(cancellationToken).ConfigureAwait(false))
{
await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
transaction.Commit();
}
}
catch (DbUpdateException exception) when(correlationId.HasValue)
{
IQueryable <Correlation> query = from c in context.Correlations
where c.AggregateId == sourceId && c.CorrelationId == correlationId
select c;
if (await query.AnyAsync().ConfigureAwait(false))
{
throw new DuplicateCorrelationException(
typeof(T),
sourceId,
correlationId.Value,
exception);
}
throw;
}
#else
try
{
await context.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
}
catch (DbUpdateException exception)
when(exception.InnerException is UpdateException)
{
var updateException = (UpdateException)exception.InnerException;
Correlation correlation = updateException
.StateEntries
.Select(s => s.Entity)
.OfType <Correlation>()
.FirstOrDefault();
if (correlation != null)
{
throw new DuplicateCorrelationException(
typeof(T),
sourceId,
correlation.CorrelationId,
exception);
}
throw;
}
#endif
}