/// <summary>
/// This method checks for a message on the supplied endpoint
/// </summary>
/// <param name="endpointName">Name of the endpoint configuration</param>
/// <returns>True if a message was found on the queue and handled, otherwise false</returns>
public virtual bool CheckForMessage(string endpointName)
{
var retVal = false;
var endpoint = QueueEndpointProvider.GetEndpointByName(endpointName);
ValidateEndpoint(endpoint);
EndpointName = endpointName;
var subscription = endpoint.Subscription;
var factory = RabbitMqFactory.GetConnectionFactory(endpoint);
using (IConnection connection = factory.CreateConnection())
{
using (var channel = connection.CreateModel())
{
ChannelConfigurator.ConfigureErrorHandling(endpoint, channel);
}
using (var channel = connection.CreateModel())
{
ChannelConfigurator.ConfigureQueue(endpoint, channel);
_consumer = RabbitMqFactory.GetBasicConsumer(channel, connection);
var result = channel.BasicGet(subscription.QueueName, subscription.NoAck);
if (result != null)
{
HandleReceivedMessage(channel, subscription, result);
retVal = true;
}
_consumer.Close();
}
}
return retVal;
}
public virtual void Start(string endpointName)
{
if (Receivers.Count == 0)
throw new InvalidOperationException(
"ReceiveListener cannot be started without receivers. Register at least 1 receiver by calling AddReceiver(IReceiver receiver)");
_isStarted = true;
var endpoint = QueueEndpointProvider.GetEndpointByName(endpointName);
EndpointName = endpointName;
ValidateEndpoint(endpoint);
var subscription = endpoint.Subscription;
var factory = RabbitMqFactory.GetConnectionFactory(endpoint);
using (var connection = factory.CreateConnection())
{
using (var channel = connection.CreateModel())
{
ChannelConfigurator.ConfigureErrorHandling(endpoint, channel);
}
using (var channel = connection.CreateModel())
{
ChannelConfigurator.ConfigureQueue(endpoint, channel);
_consumer = RabbitMqFactory.GetBasicConsumer(channel, connection);
channel.BasicConsume(endpoint.RoutingKey, subscription.NoAck, _consumer.GetConsumer());
try
{
while (_isStarted)
{
var ea =
(BasicDeliverEventArgs) _consumer.Dequeue();
HandleReceivedMessage(channel, subscription, ea);
}
}
catch (EndOfStreamException)
{
// This try-catch is not as ugly as it may seem;)
// http://www.rabbitmq.com/releases/rabbitmq-dotnet-client/v2.6.1/rabbitmq-dotnet-client-2.6.1-client-htmldoc/html/type-RabbitMQ.Util.SharedQueue.html#method-M:RabbitMQ.Util.SharedQueue.Dequeue
var sb = new StringBuilder();
sb.AppendLine("An EndOfStreamException was caught.");
sb.AppendLine("This behaviour is expected when a connection/channel is closed by the client.");
Logger.Log(sb.ToString());
}
}
}
}
