-----Original Message-----
From: Daiter, Sophie
Sent: Wednesday, November 01, 2023 13:03
To: users-h...@activemq.apache.org
Subject: RE: WELCOME to users@activemq.apache.org
Hi,
I am using Apache.NMS.ActiveMQ.NetStd nuget version 1.8.0 We implemented
producer and consumer.
Everything is working fine but few times a day we encounter strange behavior
where "producer.send(message)" finishes successfully but the consumer doesn’t
get the message.
Could you help me to figure out why this might happen?
Can the actual queue may be loosing messages? Maybe producer.send() is
swallowing exceptions it has and doesn’t succeed?
Attached producer and consumer we implemented
Please advice
Sophie
-----Original Message-----
From: users-h...@activemq.apache.org <users-h...@activemq.apache.org>
Sent: Wednesday, November 01, 2023 12:51
To: Daiter, Sophie <sophie.dai...@intel.com>
Subject: WELCOME to users@activemq.apache.org
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From: "Daiter, Sophie" <sophie.dai...@intel.com>
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using System;
using System.Threading.Tasks;
using Apache.NMS;
using Apache.NMS.ActiveMQ;
using CSharpFunctionalExtensions;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using OrchestratorService.Configuration;
using OrchestratorService.Logging;
using IAmqMessage = Apache.NMS.IMessage;
namespace OrchestratorService.Queue.ActiveMq
{
public class ActiveMqConsumer<T> : IQueueConsumer
where T : IMessage
{
private readonly ISparkLogger<ActiveMqConsumer<T>> _logger;
private readonly IOptions<QueueOptions> _queueOptions;
private Apache.NMS.IMessageConsumer _consumer;
private Func<string, Task> _onMessage;
private IConnection _connection;
private ISession _session;
public ActiveMqConsumer(ISparkLogger<ActiveMqConsumer<T>> logger,
IOptions<QueueOptions> queueOptions)
{
_logger = logger;
_queueOptions = queueOptions;
}
public Result StartConsuming(Func<string, Task> onMessage)
{
var config = _queueOptions.Value;
_onMessage = onMessage;
try
{
var factory = new ConnectionFactory(config.BrokerUri);
_connection = factory.CreateConnection(config.Username,
config.Password);
_connection.Start();
// todo: use transactional ack to handle failures in execution
// _session =
_connection.CreateSession(AcknowledgementMode.Transactional); // with client
ack for a specific message:
https://activemq.apache.org/components/nms/msdoc/1.6.0/vs2005/Output/html/T_Apache_NMS_AcknowledgementMode.htm
_session = _connection.CreateSession();
var destination = _session.GetQueue(config.QueueName);
var messageType = typeof(T).Name;
var selector = $"messageType = '{messageType}'";
_consumer = _session.CreateConsumer(destination, selector);
_logger.LogInformation("Start consuming messages....");
_consumer.Listener += OnTextMessage;
_connection.ExceptionListener += ConnectionOnExceptionListener;
_connection.ConnectionInterruptedListener +=
ConnectionOnConnectionInterruptedListener;
_connection.ConnectionResumedListener +=
ConnectionOnConnectionResumedListener;
}
catch (Exception e)
{
return Result.Fail($"Cannot start handling messages, error:
{e}");
}
return Result.Ok();
}
public Result StopConsuming()
{
try
{
_consumer.Listener -= OnTextMessage;
_onMessage = null;
_consumer.Dispose();
_session.Dispose();
_connection.ExceptionListener -= ConnectionOnExceptionListener;
_connection.ConnectionInterruptedListener -=
ConnectionOnConnectionInterruptedListener;
_connection.ConnectionResumedListener -=
ConnectionOnConnectionResumedListener;
_connection.Stop();
_connection.Dispose();
}
catch (Exception e)
{
return Result.Fail($"Cannot stop handling messages, error:
{e}");
}
_logger.LogInformation("Stopped consuming messages....");
return Result.Ok();
}
// see:
https://docs.microsoft.com/en-us/archive/msdn-magazine/2013/march/async-await-best-practices-in-asynchronous-programming
// for explanation on async void here
private async void OnTextMessage(IAmqMessage message)
{
if (!(message is ITextMessage textMessage))
{
_logger.LogCritical($"received message {message.NMSMessageId}
is not a text message");
return;
}
_logger.LogInformation($"Received message: {textMessage.Text}");
if (_onMessage == null)
{
_logger.LogCritical($"cannot handle message
{message.NMSMessageId}, onMessage is null");
}
else
{
await _onMessage(textMessage.Text);
}
}
// Active MQ has automatic failover when the connection is interrupted
// the connection is recreated & resumed automatically
private void ConnectionOnConnectionResumedListener()
{
_logger.LogInformation("ActiveMQ consumer connection resumed");
}
private void ConnectionOnConnectionInterruptedListener()
{
_logger.LogInformation("ActiveMQ consumer connection interrupted");
}
private void ConnectionOnExceptionListener(Exception exception)
{
_logger.LogError($"ActiveMQ consumer connection caught exception:
${exception}");
}
}
}
using System;
using Apache.NMS;
using Apache.NMS.ActiveMQ;
using CSharpFunctionalExtensions;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using OrchestratorService.Configuration;
using OrchestratorService.Logging;
namespace OrchestratorService.Queue.ActiveMq
{
public class ActiveMqProducer : IQueueProducer, IDisposable
{
private readonly ISparkLogger<ActiveMqProducer> _logger;
private readonly IConnection _connection;
private readonly ISession _session;
private readonly Apache.NMS.IMessageProducer _producer;
public ActiveMqProducer(IOptions<QueueOptions> queueOptions,
ISparkLogger<ActiveMqProducer> logger)
{
_logger = logger;
var config = queueOptions.Value;
var factory = new ConnectionFactory(config.BrokerUri);
_connection = factory.CreateConnection(config.Username,
config.Password);
_connection.Start();
_session = _connection.CreateSession();
var destination = _session.GetQueue(config.QueueName);
_producer = _session.CreateProducer(destination);
_connection.ExceptionListener += ConnectionOnExceptionListener;
_connection.ConnectionInterruptedListener +=
ConnectionOnConnectionInterruptedListener;
_connection.ConnectionResumedListener +=
ConnectionOnConnectionResumedListener;
}
public void Dispose()
{
try
{
_producer.Dispose();
_session.Dispose();
_connection.ExceptionListener -= ConnectionOnExceptionListener;
_connection.ConnectionInterruptedListener -=
ConnectionOnConnectionInterruptedListener;
_connection.ConnectionResumedListener -=
ConnectionOnConnectionResumedListener;
_connection.Stop();
_connection.Dispose();
}
catch (Exception e)
{
_logger.LogCritical($"failed to dispose producer, error: {e}");
}
_logger.LogInformation("producer disposed successfully");
}
public Result QueueMessage<T>(string message)
{
var messageToSend = _session.CreateTextMessage(message);
// create a property with the message type that can be used as a
selector by the consumer.
// this can be used later on for messages that are of other types
than WorkItemMessage
var messageType = typeof(T).Name;
messageToSend.Properties.SetString("messageType", messageType);
_logger.LogInformation($"Sending message to queue: {message}...");
try
{
_producer.Send(messageToSend);
}
catch (Exception e)
{
var error = $"failed to add message to queue, \nerror: ${e}
\nmessage: {message}";
return Result.Fail(error);
}
_logger.LogInformation($"message was added successfully to queue,
message: {message}");
return Result.Ok();
}
// Active MQ has automatic failover when the connection is interrupted
// the connection is recreated & resumed automatically
private void ConnectionOnConnectionResumedListener()
{
_logger.LogInformation("ActiveMQ producer connection resumed");
}
private void ConnectionOnConnectionInterruptedListener()
{
_logger.LogInformation("ActiveMQ producer connection interrupted");
}
private void ConnectionOnExceptionListener(Exception exception)
{
_logger.LogError($"ActiveMQ producer connection caught exception:
${exception}");
}
}
}
