private string EnsureQueueExists(string queueName, RabbitWorkQueueMode mode, IDictionary <string, object> queueArgs = null)
{
queueName = queueName ?? "";
using (var ch = CreateChannel())
{
// try to create queue
try
{
var res = ch.QueueDeclare(queue: queueName ?? "",
durable: mode == RabbitWorkQueueMode.OpenOrCreatePersistent,
exclusive: false,
autoDelete: mode == RabbitWorkQueueMode.OpenOrCreateTemporary,
arguments: queueArgs);
// set queue name if a random one was generated
if (String.IsNullOrEmpty(queueName) && res != null)
{
queueName = res.QueueName;
}
}
catch { }
}
return(queueName);
}
private void Initialize(string address, int port, string username, string password, string queueName, ushort batchSize, RabbitWorkQueueMode mode, int retryDelayMilliseconds, int maxRetry)
{
QueueName = queueName;
Mode = mode;
_batchSize = batchSize;
_retryDelayMilliseconds = retryDelayMilliseconds;
_maxRetry = maxRetry;
// open connection and channel
_factory = new RabbitConnectionFactory(address, port, username, password);
// create our channels
_publishChannel = CreateChannel();
_consumerChannel = CreateChannel();
// publish mode
_publishPersistent = mode == RabbitWorkQueueMode.OpenOrCreatePersistent || mode == RabbitWorkQueueMode.OpenPersistent;
// create queue (only if not exists)
if (mode != RabbitWorkQueueMode.OpenPersistent && mode != RabbitWorkQueueMode.OpenInMemory)
{
if (String.IsNullOrEmpty(queueName))
{
queueName = "temp_" + System.IO.Path.GetRandomFileName().Replace(".", "") + "_" + DateTime.UtcNow.ToString("yyyyMMdd");
}
// declare delayed exchange
if (retryDelayMilliseconds > 0)
{
delayedExchange = queueName + ".delayed";
SafeExecute(c => c.ExchangeDeclare(delayedExchange, "x-delayed-message", true, true, CreateProperty("x-delayed-type", "direct")));
}
// create dead letter queue
// note: dead-letter queue will be create only if needed
// check if queue already exists
var args = new Dictionary <string, object> ();
args.AddProperty("x-dead-letter-exchange", delayedExchange ?? "");
// args.AddProperty ("x-dead-letter-routing-key", queueName);
QueueName = EnsureQueueExists(queueName, mode, args);
// bind together exchanges to queue
SafeExecute(c => c.QueueBind(QueueName, delayedExchange, QueueName));
}
}
/// <summary>
/// Initializes a new instance of the <see cref="RabbitWorkQueue" /> class.
/// </summary>
/// <param name="queueUri">The queue URI address formated as amqp://login:password@address:port</param>
/// <param name="queueName">Queue name. If empty, a temporary queue with a random queue name will be created.</param>
/// <param name="batchSize">Maximum number of unacknowledged messages for this connection. This helps to improve throughput as multiple messages are received for each request. Use '0' for ilimited.</param>
/// <param name="mode">How to handle queue creation and message publishing.</param>
/// <param name="retryDelayMilliseconds">The retry delay milliseconds. In case of failed message (Nack) will wait the retry delay before becoming available again.</param>
/// <param name="maxRetry">The max retry for failed (Nack) messages.</param>
public RabbitWorkQueue(string queueUri, string queueName, ushort batchSize = 10, RabbitWorkQueueMode mode = RabbitWorkQueueMode.OpenOrCreateInMemory, int retryDelayMilliseconds = 0, int maxRetry = 0)
{
if (queueUri.IndexOf("://") < 0)
{
queueUri = "amqp://" + queueUri;
}
var uri = new Uri(queueUri);
var auth = uri.UserInfo.Split(':');
Initialize(uri.Host, uri.Port > 0 ? uri.Port : 5672, auth[0], auth.Length > 1 ? auth[1] : "", queueName, batchSize, mode, retryDelayMilliseconds, maxRetry);
}
/// <summary>
/// Initializes a new instance of the <see cref="RabbitWorkQueue" /> class.
/// </summary>
/// <param name="address">RabbitMQ address.</param>
/// <param name="port">RabbitMQ server port. Defaults to 5672.</param>
/// <param name="username">RabbitMQ username.</param>
/// <param name="password">RabbitMQ password.</param>
/// <param name="queueName">Queue name. If empty, a temporary queue with a random queue name will be created.</param>
/// <param name="batchSize">Maximum number of unacknowledged messages for this connection. This helps to improve throughput as multiple messages are received for each request. Use '0' for ilimited.</param>
/// <param name="mode">How to handle queue creation and message publishing.</param>
/// <param name="retryDelayMilliseconds">The retry delay milliseconds. In case of failed message (Nack) will wait the retry delay before becoming available again.</param>
/// <param name="maxRetry">The max retry for failed (Nack) messages.</param>
public RabbitWorkQueue(string address, int port, string username, string password, string queueName, ushort batchSize = 10, RabbitWorkQueueMode mode = RabbitWorkQueueMode.OpenOrCreateInMemory, int retryDelayMilliseconds = 0, int maxRetry = 0)
{
Initialize(address, port, username, password, queueName, batchSize, mode, retryDelayMilliseconds, maxRetry);
}