public async Task WriteWithETagViolation()
{
GrainState <EntityWithIntegerKeyWithEtag> grainState =
Internal.Utils.CreateAndStoreGrainState <EntityWithIntegerKeyWithEtag>(_serviceProvider);
TestGrainReference grainRef
= TestGrainReference.Create(grainState.State);
// update the database
EntityWithIntegerKeyWithEtag clone = grainState.State.Clone();
clone.Title = "Updated";
using (var context = _serviceProvider.GetRequiredService <TestDbContext>())
{
context.Entry(clone).State = EntityState.Modified;
context.SaveChanges();
}
// This should fail
grainState.State.Title = "Failing Update";
await Assert.ThrowsAsync <InconsistentStateException>(() =>
_storage.WriteStateAsync(typeof(GrainWithIntegerKeyWithEtag).FullName,
grainRef,
grainState));
}
private void MockConcurrencyChecks()
{
// Check etags as the in-memory storage doesn't
foreach (EntityWithIntegerKeyWithEtag entitiy in this.ETagEntities.Local)
{
var entry = this.Entry(entitiy);
if (entry.State != EntityState.Modified)
{
continue;
}
EntityWithIntegerKeyWithEtag storedEntity = this.ETagEntities.AsNoTracking()
.Single(e => e.Id == entitiy.Id);
if (!storedEntity.ETag.SequenceEqual(entitiy.ETag))
{
throw new DbUpdateConcurrencyException("ETag violation",
entry.GetInfrastructure().StateManager.Entries.Select(
e => (IUpdateEntry)e).ToList());
}
entitiy.ETag = BitConverter.GetBytes(Random.Next());
}
}
