public async Task Send(SagaConsumeContext <TSaga, TMessage> context)
{
var proxy = new EntityFrameworkSagaConsumeContext <TSaga, TMessage>(_dbContext, context, context.Saga, false);
proxy.LogAdded();
await _next.Send(proxy).ConfigureAwait(false);
if (!proxy.IsCompleted)
{
_dbContext.Set <TSaga>().Add(context.Saga);
}
await _dbContext.SaveChangesAsync(context.CancellationToken).ConfigureAwait(false);
}
public async Task Send(SagaConsumeContext <TSaga, TMessage> context)
{
if (_log.IsDebugEnabled)
{
_log.DebugFormat("SAGA:{0}:{1} Added {2}", TypeMetadataCache <TSaga> .ShortName,
context.Saga.CorrelationId,
TypeMetadataCache <TMessage> .ShortName);
}
var proxy = new EntityFrameworkSagaConsumeContext <TSaga, TMessage>(_dbContext, context, context.Saga, false);
await _next.Send(proxy).ConfigureAwait(false);
if (!proxy.IsCompleted)
{
_dbContext.Set <TSaga>().Add(context.Saga);
}
await _dbContext.SaveChangesAsync(context.CancellationToken).ConfigureAwait(false);
}
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 SendToInstance <T>(SagaQueryConsumeContext <TSaga, T> context, DbContext dbContext, ISagaPolicy <TSaga, T> policy, TSaga instance,
IPipe <SagaConsumeContext <TSaga, T> > next)
where T : class
{
try
{
if (_log.IsDebugEnabled)
{
_log.DebugFormat("SAGA:{0}:{1} Used {2}", TypeMetadataCache <TSaga> .ShortName, instance.CorrelationId, TypeMetadataCache <T> .ShortName);
}
var sagaConsumeContext = new EntityFrameworkSagaConsumeContext <TSaga, T>(dbContext, context, instance);
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);
}
}
private 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 <T>(dbContext, instance, context.CancellationToken).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
{
if (_log.IsDebugEnabled)
{
_log.DebugFormat("SAGA:{0}:{1} Used {2}", TypeMetadataCache <TSaga> .ShortName, instance.CorrelationId,
TypeMetadataCache <T> .ShortName);
}
var sagaConsumeContext = new EntityFrameworkSagaConsumeContext <TSaga, T>(dbContext, context, instance);
await policy.Existing(sagaConsumeContext, next).ConfigureAwait(false);
}
await dbContext.SaveChangesAsync(context.CancellationToken).ConfigureAwait(false);
transaction.Commit();
}
catch (DbUpdateConcurrencyException)
{
try
{
transaction.Rollback();
}
catch (Exception innerException)
{
if (_log.IsWarnEnabled)
{
_log.Warn("The transaction rollback failed", innerException);
}
}
throw;
}
catch (DbUpdateException ex)
{
if (IsDeadlockException(ex))
{
// deadlock, no need to rollback
}
else
{
if (_log.IsErrorEnabled)
{
_log.Error($"SAGA:{TypeMetadataCache<TSaga>.ShortName} Exception {TypeMetadataCache<T>.ShortName}", ex);
}
try
{
transaction.Rollback();
}
catch (Exception innerException)
{
if (_log.IsWarnEnabled)
{
_log.Warn("The transaction rollback failed", innerException);
}
}
}
throw;
}
catch (Exception ex)
{
if (_log.IsErrorEnabled)
{
_log.Error($"SAGA:{TypeMetadataCache<TSaga>.ShortName} Exception {TypeMetadataCache<T>.ShortName}", ex);
}
try
{
transaction.Rollback();
}
catch (Exception innerException)
{
if (_log.IsWarnEnabled)
{
_log.Warn("The transaction rollback failed", innerException);
}
}
throw;
}
}
async Task ISagaRepository <TSaga> .Send <T>(ConsumeContext <T> context, ISagaPolicy <TSaga, T> policy,
IPipe <SagaConsumeContext <TSaga, T> > next)
{
if (!context.CorrelationId.HasValue)
{
throw new SagaException("The CorrelationId was not specified", typeof(TSaga), typeof(T));
}
var sagaId = context.CorrelationId.Value;
using (var dbContext = _sagaDbContextFactory())
using (var transaction = await dbContext.Database.BeginTransactionAsync(_isolationLevel, context.CancellationToken).ConfigureAwait(false))
{
if (!_optimistic)
{
// Hack for locking row for the duration of the transaction.
var tableName = dbContext.GetTableName <TSaga>();
await dbContext.Database.ExecuteSqlCommandAsync(
$"select 1 from {tableName} WITH (UPDLOCK, ROWLOCK) WHERE CorrelationId = @p0",
new object[] { sagaId },
context.CancellationToken).ConfigureAwait(false);
}
var inserted = false;
TSaga instance;
if (policy.PreInsertInstance(context, out instance))
{
inserted = await PreInsertSagaInstance <T>(dbContext, instance, context.CancellationToken).ConfigureAwait(false);
}
try
{
if (instance == null)
{
instance =
await QuerySagas <T>(dbContext).SingleOrDefaultAsync(x => x.CorrelationId == sagaId, context.CancellationToken).ConfigureAwait(false);
}
if (instance == null)
{
var missingSagaPipe = new MissingPipe <T>(dbContext, next);
await policy.Missing(context, missingSagaPipe).ConfigureAwait(false);
}
else
{
if (_log.IsDebugEnabled)
{
_log.DebugFormat("SAGA:{0}:{1} Used {2}", TypeMetadataCache <TSaga> .ShortName, instance.CorrelationId,
TypeMetadataCache <T> .ShortName);
}
var sagaConsumeContext = new EntityFrameworkSagaConsumeContext <TSaga, T>(dbContext, context, instance);
await policy.Existing(sagaConsumeContext, next).ConfigureAwait(false);
}
await dbContext.SaveChangesAsync(context.CancellationToken).ConfigureAwait(false);
transaction.Commit();
}
catch (DbUpdateConcurrencyException ex)
{
try
{
transaction.Rollback();
}
catch (Exception innerException)
{
if (_log.IsWarnEnabled)
{
_log.Warn("The transaction rollback failed", innerException);
}
}
throw;
}
catch (DbUpdateException ex)
{
if (IsDeadlockException(ex))
{
// deadlock, no need to rollback
}
else
{
if (_log.IsErrorEnabled)
{
_log.Error($"SAGA:{TypeMetadataCache<TSaga>.ShortName} Exception {TypeMetadataCache<T>.ShortName}", ex);
}
try
{
transaction.Rollback();
}
catch (Exception innerException)
{
if (_log.IsWarnEnabled)
{
_log.Warn("The transaction rollback failed", innerException);
}
}
}
throw;
}
catch (Exception ex)
{
if (_log.IsErrorEnabled)
{
_log.Error($"SAGA:{TypeMetadataCache<TSaga>.ShortName} Exception {TypeMetadataCache<T>.ShortName}", ex);
}
try
{
transaction.Rollback();
}
catch (Exception innerException)
{
if (_log.IsWarnEnabled)
{
_log.Warn("The transaction rollback failed", innerException);
}
}
throw;
}
}
}
