public ReceiveResult TryReceiveFrom(TableBasedQueue queue)
{
MessageReadResult readResult;
using (var connection = sqlConnectionFactory.OpenNewConnection(connectionString))
{
readResult = queue.TryReceive(connection);
if (readResult.IsPoison)
{
errorQueue.Send(readResult.DataRecord, connection);
return(ReceiveResult.NoMessage());
}
}
if (!readResult.Successful)
{
return(ReceiveResult.NoMessage());
}
var result = ReceiveResult.Received(readResult.Message);
try
{
tryProcessMessageCallback(readResult.Message);
return(result);
}
catch (Exception ex)
{
return(result.FailedProcessing(ex));
}
}
ReceiveResult TryReceiveWithDTCTransaction()
{
var result = new ReceiveResult();
using (var scope = new TransactionScope(TransactionScopeOption.Required, transactionOptions))
{
var message = Receive();
if (message == null)
{
scope.Complete();
return(result);
}
result.Message = message;
try
{
if (tryProcessMessage(message))
{
scope.Complete();
scope.Dispose(); // We explicitly calling Dispose so that we force any exception to not bubble, eg Concurrency/Deadlock exception.
}
}
catch (Exception ex)
{
result.Exception = ex;
}
return(result);
}
}
public ReceiveResult TryReceiveFrom(TableBasedQueue queue)
{
using (var connection = new SqlConnection(connectionString))
{
connection.Open();
using (pipelineExecutor.SetConnection(connectionString, connection))
{
using (var transaction = connection.BeginTransaction(isolationLevel))
{
using (pipelineExecutor.SetTransaction(connectionString, transaction))
{
MessageReadResult readResult;
try
{
readResult = queue.TryReceive(connection, transaction);
}
catch (Exception)
{
transaction.Rollback();
throw;
}
if (readResult.IsPoison)
{
errorQueue.Send(readResult.DataRecord, connection, transaction);
transaction.Commit();
return(ReceiveResult.NoMessage());
}
if (!readResult.Successful)
{
transaction.Commit();
return(ReceiveResult.NoMessage());
}
var result = ReceiveResult.Received(readResult.Message);
try
{
if (tryProcessMessageCallback(result.Message))
{
transaction.Commit();
}
else
{
transaction.Rollback();
}
return(result);
}
catch (Exception ex)
{
transaction.Rollback();
return(result.FailedProcessing(ex));
}
}
}
}
}
}
ReceiveResult TryReceiveWithNativeTransaction()
{
var result = new ReceiveResult();
using (var connection = new SqlConnection(ConnectionString))
{
connection.Open();
using (var transaction = connection.BeginTransaction(GetSqlIsolationLevel(settings.IsolationLevel)))
{
TransportMessage message;
try
{
message = ReceiveWithNativeTransaction(connection, transaction);
}
catch (Exception)
{
transaction.Rollback();
throw;
}
if (message == null)
{
transaction.Commit();
return(result);
}
result.Message = message;
try
{
if (MessageSender != null)
{
MessageSender.SetTransaction(transaction);
}
if (tryProcessMessage(message))
{
transaction.Commit();
}
else
{
transaction.Rollback();
}
}
catch (Exception ex)
{
result.Exception = ex;
transaction.Rollback();
}
return(result);
}
}
}
public ReceiveResult TryReceiveFrom(TableBasedQueue queue)
{
using (var scope = new TransactionScope(TransactionScopeOption.Required, transactionOptions))
{
using (var connection = new SqlConnection(connectionString))
{
connection.Open();
using (pipelineExecutor.SetConnection(connectionString, connection))
{
var readResult = queue.TryReceive(connection);
if (readResult.IsPoison)
{
errorQueue.Send(readResult.DataRecord, connection);
scope.Complete();
return(ReceiveResult.NoMessage());
}
if (!readResult.Successful)
{
scope.Complete();
return(ReceiveResult.NoMessage());
}
var result = ReceiveResult.Received(readResult.Message);
try
{
if (tryProcessMessageCallback(readResult.Message))
{
scope.Complete();
scope.Dispose(); // We explicitly calling Dispose so that we force any exception to not bubble, eg Concurrency/Deadlock exception.
}
return(result);
}
catch (Exception ex)
{
return(result.FailedProcessing(ex));
}
}
}
}
}
private void Action(object obj)
{
var cancellationToken = (CancellationToken)obj;
var backOff = new BackOff(1000);
while (!cancellationToken.IsCancellationRequested)
{
var result = new ReceiveResult();
try
{
if (settings.IsTransactional)
{
if (settings.DontUseDistributedTransactions)
{
result = TryReceiveWithNativeTransaction();
}
else
{
result = TryReceiveWithDTCTransaction();
}
}
else
{
result = TryReceiveWithNoTransaction();
}
}
finally
{
//since we're polling the message will be null when there was nothing in the queue
if (result.Message != null)
{
endProcessMessage(result.Message, result.Exception);
}
}
circuitBreaker.Success();
backOff.Wait(() => result.Message == null);
}
}
ReceiveResult TryReceiveWithNoTransaction()
{
var result = new ReceiveResult();
var message = Receive();
if (message == null)
{
return(result);
}
result.Message = message;
try
{
tryProcessMessage(message);
}
catch (Exception ex)
{
result.Exception = ex;
}
return(result);
}
ReceiveResult TryReceiveWithNoTransaction()
{
var result = new ReceiveResult();
var message = Receive();
if (message == null)
return result;
result.Message = message;
try
{
tryProcessMessage(message);
}
catch (Exception ex)
{
result.Exception = ex;
}
return result;
}
ReceiveResult TryReceiveWithNativeTransaction()
{
var result = new ReceiveResult();
using (var connection = new SqlConnection(ConnectionString))
{
connection.Open();
using (var transaction = connection.BeginTransaction(GetSqlIsolationLevel(settings.IsolationLevel)))
{
TransportMessage message;
try
{
message = ReceiveWithNativeTransaction(connection, transaction);
}
catch (Exception)
{
transaction.Rollback();
throw;
}
if (message == null)
{
transaction.Commit();
return result;
}
result.Message = message;
try
{
if (MessageSender != null)
{
MessageSender.SetTransaction(transaction);
}
if (tryProcessMessage(message))
{
transaction.Commit();
}
else
{
transaction.Rollback();
}
}
catch (Exception ex)
{
result.Exception = ex;
transaction.Rollback();
}
return result;
}
}
}
ReceiveResult TryReceiveWithDTCTransaction()
{
var result = new ReceiveResult();
using (var scope = new TransactionScope(TransactionScopeOption.Required, transactionOptions))
{
var message = Receive();
if (message == null)
{
scope.Complete();
return result;
}
result.Message = message;
try
{
if (tryProcessMessage(message))
{
scope.Complete();
scope.Dispose(); // We explicitly calling Dispose so that we force any exception to not bubble, eg Concurrency/Deadlock exception.
}
}
catch (Exception ex)
{
result.Exception = ex;
}
return result;
}
}
private void Action(object obj)
{
var cancellationToken = (CancellationToken)obj;
var backOff = new BackOff(1000);
while (!cancellationToken.IsCancellationRequested)
{
var result = new ReceiveResult();
try
{
if (settings.IsTransactional)
{
if (settings.DontUseDistributedTransactions)
{
result = TryReceiveWithNativeTransaction();
}
else
{
result = TryReceiveWithDTCTransaction();
}
}
else
{
result = TryReceiveWithNoTransaction();
}
}
finally
{
//since we're polling the message will be null when there was nothing in the queue
if (result.Message != null)
endProcessMessage(result.Message, result.Exception);
}
circuitBreaker.Success();
backOff.Wait(() => result.Message == null);
}
}