async Task SendToInstance <T>(SagaQueryConsumeContext <TSaga, T> context, DbContext dbContext, ISagaPolicy <TSaga, T> policy, TSaga instance,
IPipe <SagaConsumeContext <TSaga, T> > next)
where T : class
{
try
{
var sagaConsumeContext = new EntityFrameworkSagaConsumeContext <TSaga, T>(dbContext, context, instance);
sagaConsumeContext.LogUsed();
await policy.Existing(sagaConsumeContext, next).ConfigureAwait(false);
}
catch (SagaException)
{
throw;
}
catch (Exception ex)
{
throw new SagaException(ex.Message, typeof(TSaga), typeof(T), instance.CorrelationId, ex);
}
}
async Task SendLogic <T>(IDbContextTransaction transaction, DbContext dbContext, ConsumeContext <T> context, ISagaPolicy <TSaga, T> policy,
IPipe <SagaConsumeContext <TSaga, T> > next)
where T : class
{
var sagaId = context.CorrelationId.Value;
if (policy.PreInsertInstance(context, out var instance))
{
var inserted = await PreInsertSagaInstance(dbContext, context, instance).ConfigureAwait(false);
if (!inserted)
{
instance = null; // Reset this back to null if the insert failed. We will use the MissingPipe to create instead
}
}
try
{
if (instance == null)
{
IQueryable <TSaga> queryable = QuerySagas(dbContext);
// Query with a row Lock instead using FromSql. Still a single trip to the DB (unlike EF6, which has to make one dummy call to row lock)
var rowLockQuery = _rawSqlLockStatements?.GetRowLockStatement <TSaga>(dbContext);
if (rowLockQuery != null)
{
instance = await queryable.FromSql(rowLockQuery, new object[] { sagaId }).SingleOrDefaultAsync(context.CancellationToken)
.ConfigureAwait(false);
}
else
{
instance = await queryable.SingleOrDefaultAsync(x => x.CorrelationId == sagaId, context.CancellationToken).ConfigureAwait(false);
}
}
if (instance == null)
{
var missingSagaPipe = new MissingPipe <T>(dbContext, next);
await policy.Missing(context, missingSagaPipe).ConfigureAwait(false);
}
else
{
var sagaConsumeContext = new EntityFrameworkSagaConsumeContext <TSaga, T>(dbContext, context, instance);
sagaConsumeContext.LogUsed();
await policy.Existing(sagaConsumeContext, next).ConfigureAwait(false);
}
await dbContext.SaveChangesAsync(context.CancellationToken).ConfigureAwait(false);
transaction.Commit();
}
catch (DbUpdateConcurrencyException)
{
try
{
transaction.Rollback();
}
catch (Exception innerException)
{
LogContext.Warning?.Log(innerException, "Transaction rollback failed");
}
throw;
}
catch (DbUpdateException ex)
{
if (IsDeadlockException(ex))
{
// deadlock, no need to rollback
}
else
{
context.LogFault(this, ex, instance?.CorrelationId);
try
{
transaction.Rollback();
}
catch (Exception innerException)
{
LogContext.Warning?.Log(innerException, "Transaction rollback failed");
}
}
throw;
}
catch (Exception ex)
{
context.LogFault(this, ex, instance?.CorrelationId);
try
{
transaction.Rollback();
}
catch (Exception innerException)
{
LogContext.Warning?.Log(innerException, "Transaction rollback failed");
}
throw;
}
}