public void TestVerifyPopulatedChecks()
{
var producerOptions = new ProducerOptions();
Assert.False(producerOptions.VerifyPopulated());
producerOptions.ExchangeName = "";
Assert.False(producerOptions.VerifyPopulated());
producerOptions.ExchangeName = "Test.ExchangeName";
Assert.True(producerOptions.VerifyPopulated());
var consumerOptions = new ConsumerOptions();
Assert.False(consumerOptions.VerifyPopulated());
consumerOptions.QueueName = "Test.QueueName";
Assert.False(consumerOptions.VerifyPopulated());
consumerOptions.QoSPrefetchCount = 1234;
Assert.True(consumerOptions.VerifyPopulated());
}
/// <summary>
/// Setup a subscription to a queue which sends messages to the <see cref="IConsumer"/>.
/// </summary>
/// <param name="consumerOptions">The connection options.</param>
/// <param name="consumer">Consumer that will be sent any received messages.</param>
/// <param name="isSolo">If specified, will ensure that it is the only consumer on the provided queue</param>
/// <returns>Identifier for the consumer task, can be used to stop the consumer without shutting down the whole adapter</returns>
public Guid StartConsumer(ConsumerOptions consumerOptions, IConsumer consumer, bool isSolo = false)
{
if (ShutdownCalled)
{
throw new ApplicationException("Adapter has been shut down");
}
if (consumerOptions == null)
{
throw new ArgumentNullException(nameof(consumerOptions));
}
if (!consumerOptions.VerifyPopulated())
{
throw new ArgumentException("The given ConsumerOptions has invalid values");
}
// Client label is the same for the IConnection and Subscription since we have a separate connection per consumer
string label = string.Format("{0}::Consumer::{1}", _hostId, consumerOptions.QueueName);
IConnection connection = _factory.CreateConnection(label);
connection.ConnectionBlocked += (s, a) => _logger.Warn($"ConnectionBlocked for {consumerOptions.QueueName} ( Reason: {a.Reason})");
connection.ConnectionUnblocked += (s, a) => _logger.Warn($"ConnectionUnblocked for {consumerOptions.QueueName}");
IModel model = connection.CreateModel();
model.BasicQos(0, consumerOptions.QoSPrefetchCount, false);
// Check queue exists
try
{
// Passively declare the queue (equivalent to checking the queue exists)
model.QueueDeclarePassive(consumerOptions.QueueName);
}
catch (OperationInterruptedException e)
{
model.Close(200, "StartConsumer - Queue missing");
connection.Close(200, "StartConsumer - Queue missing");
throw new ApplicationException($"Expected queue \"{consumerOptions.QueueName}\" to exist", e);
}
if (isSolo && model.ConsumerCount(consumerOptions.QueueName) > 0)
{
model.Close(200, "StartConsumer - Already a consumer on the queue");
connection.Close(200, "StartConsumer - Already a consumer on the queue");
throw new ApplicationException($"Already a consumer on queue {consumerOptions.QueueName} and solo consumer was specified");
}
Subscription subscription = null;
var connected = false;
var failed = 0;
while (!connected)
{
try
{
subscription = new Subscription(model, consumerOptions.QueueName, consumerOptions.AutoAck, label);
connected = true;
}
catch (TimeoutException)
{
if (++failed >= MaxSubscriptionAttempts)
{
_logger.Warn("Retries exceeded, throwing exception");
throw;
}
_logger.Warn($"Timeout when creating Subscription, retrying in 5s...");
Thread.Sleep(TimeSpan.FromSeconds(5));
}
catch (OperationInterruptedException e)
{
throw new ApplicationException(
$"Error when creating subscription on queue \"{consumerOptions.QueueName}\"", e);
}
finally
{
if (!connected)
{
model.Close(200, "StartConsumer - Couldn't create subscription");
connection.Close(200, "StartConsumer - Couldn't create subscription");
}
}
}
Guid taskId = Guid.NewGuid();
var taskTokenSource = new CancellationTokenSource();
var consumerTask = new Task(() => Consume(subscription, consumer, taskTokenSource.Token));
var resources = new ConsumerResources
{
Connection = connection,
Model = model,
Subscription = subscription,
ConsumerTask = consumerTask,
TokenSource = taskTokenSource
};
lock (_oResourceLock)
{
_rabbitResources.Add(taskId, resources);
}
consumer.OnFatal += (s, e) =>
{
resources.Shutdown(DefaultOperationTimeout);
_hostFatalHandler(s, e);
};
consumerTask.Start();
_logger.Debug($"Consumer task started [QueueName={subscription?.QueueName}]");
return(taskId);
}