/// <summary>
/// Объявить очередь.
/// </summary>
/// <param name="channel">Канал.</param>
/// <param name="settings">Настройки подписчика.</param>
/// <param name="messageType">Тип сообщения.</param>
public void DeclareQueue(IModel channel, SubscriberSettings settings, Type messageType)
{
var queueName = _namingConvention.QueueNamingConvention(messageType, settings);
if (settings.UseDeadLetter)
{
settings.Arguments[QueueArgument.DEAD_LETTER_EXCHANGE] = _namingConvention.DeadLetterExchangeNamingConvention(messageType, settings);
settings.Arguments[QueueArgument.DEAD_LETTER_ROUTING_KEY] = queueName;
}
if (settings.ScalingSettings.UseSingleActiveConsumer)
{
settings.Arguments[QueueArgument.SINGLE_ACTIVE_CONSUMER] = true;
}
channel.QueueDeclare(
queueName,
settings.Durable,
settings.Exclusive,
settings.AutoDelete,
settings.Arguments
);
foreach (var binding in settings.Bindings)
{
// пустая строка - обменник по-умолчанию. Его создавать нельзя.
if (!string.IsNullOrWhiteSpace(binding.FromExchange))
{
channel.ExchangeDeclare(
binding.FromExchange,
durable: settings.Durable,
autoDelete: settings.AutoDelete,
type: binding.ExchangeType
);
}
if (string.Equals(binding.ExchangeType, ExchangeType.Fanout, StringComparison.OrdinalIgnoreCase))
{
channel.QueueBind(
queueName,
binding.FromExchange,
string.Empty,
binding.Arguments
);
continue; // для Fanout не требуются routingKeys, 1 биндинг на обменник и всё.
}
if (string.Equals(binding.ExchangeType, ExchangeType.Headers, StringComparison.OrdinalIgnoreCase) && binding.Arguments.Any())
{
channel.QueueBind(
queueName,
binding.FromExchange,
string.Empty,
binding.Arguments
);
continue; // для Headers не требуются routingKeys, 1 биндинг на обменник без ключей роутинга. А роут вычисляется по аргументам.
}
// для всех остальных кейсов (direct.. и прочее)
foreach (var routingKey in binding.RoutingKeys)
{
channel.QueueBind(
queueName,
binding.FromExchange,
routingKey,
binding.Arguments
);
}
}
}