public void SendMessage(byte[] message, string queueName, string exchange = "", string routingKey = null)
{
if (message is null)
{
throw new ArgumentNullException(nameof(message));
}
else if (queueName != null && queueName.Trim().Length == 0)
{
throw new ArgumentException("Queue name can not be empty or whitespace!");
}
using (var conn = AmqpConnectionWrapper.GetInstance())
using (var channel = conn.CreateModel())
{
if (queueName != null && NonDeclaredYet(queueName))
{
channel.QueueDeclare(
queue: queueName,
durable: false,
exclusive: false,
autoDelete: false,
arguments: null);
}
channel.BasicPublish(
exchange: exchange,
routingKey: routingKey ?? queueName ?? string.Empty,
basicProperties: null,
body: message);
}
}
private void Setup(string type, string exchange, IDictionary <string, object> routing)
{
if (string.IsNullOrWhiteSpace(exchange))
{
throw new ArgumentNullException(nameof(exchange));
}
else if (routing is null)
{
throw new ArgumentNullException(nameof(routing));
}
if (NonDeclaredYet(type, exchange, routing.Keys, routing.Values))
{
using (var conn = AmqpConnectionWrapper.GetInstance())
using (var channel = conn.CreateModel())
{
channel.ExchangeDeclare(exchange, type);
foreach (var r in routing)
{
if (NonDeclaredYet(r.Key))
{
channel.QueueDeclare(
queue: r.Key,
durable: false,
exclusive: false,
autoDelete: false,
arguments: null);
}
foreach (var rountingKey in GetRountingKeysByValue(r.Value))
{
channel.QueueBind(r.Key, exchange, rountingKey);
}
}
}
}
}
/// <summary>
/// Registre um consumidor para obter mensagens da fila alvo.
/// O processo ficará preso até solicitar o <see cref="Unregister{TModel}(string)"/> ou
/// <see cref="UnregisterAll"/> que finalizará o consumer.
/// </summary>
/// <typeparam name="TModel">
/// tipo do modelo serializado na mensagem na fila.
/// </typeparam>
/// <param name="onConsumedCallback">
/// callback que será executado para receber o objeto json
/// consumido da fila.
/// </param>
/// <param name="queueName">
/// nome da fila
/// </param>
/// <param name="autoAck">
/// true, define mensagem consumida automaticamente, false,
/// aguarda finalizacao do callback para confirmar consumo.
/// </param>
/// <param name="requeue">
/// define se deve reenfileirar mensagem caso nao seja ocorra algum erro.
/// </param>
/// <param name="throwsException">
/// define se deve lançar a exceção caso ocorra ao tentar consumir mensagem da fila.
/// </param>
/// <param name="balanceCount">
/// caso maior que 0 (zero), o message broker vai entregar por requisição do consumer
/// apenas o numero de mensagens definido.
/// Caso menor ou igual a 0 (zero), será verificado se existe a variavel de ambiente
/// AMQP_DBC, caso exista com um valor numérico maior que zero, será considerado
/// com a regra descrita acima, caso constrário, não habilita Qos Prefetch.
/// Viavel para balanceamento de carga.
/// </param>
/// <param name="logger">
/// log que armazenará mensagens de erro gerada.
/// </param>
/// <returns>
/// true, processo foi finalizado corretamente através de um
/// Unregister. false, processo foi interrompido por algum erro.
/// </returns>
public bool Register <TModel>(
Action <TModel> onConsumedCallback,
string queueName = null,
bool autoAck = false,
bool requeue = true,
bool throwsException = true,
ushort balanceCount = 0 /*not enabled*/,
ILogger logger = null)
{
if (queueName is null)
{
queueName = nameof(TModel);
}
else if (queueName.Trim().Length == 0)
{
throw new ArgumentException("Invalid queue name!");
}
Exception error = null;
var hash = GetResetEventHash <TModel>(queueName);
if (resetEvents.TryGetValue(hash, out var resetEvent))
{
throw new InvalidOperationException("Operation already registered before to " +
"the same model type and target queue!");
}
else if (!resetEvents.TryAdd(hash, resetEvent = new ManualResetEvent(false)))
{
return(false);//another process did it.
}
try
{
using (var conn = AmqpConnectionWrapper.GetInstance())
using (var channel = conn.CreateModel())
{
if (balanceCount > 0 ||
(balanceCount = ConnectionEnvironment.AMQP_DBC.ToUInt16()) > 0)
{
channel.BasicQos(0u, balanceCount, false /*per consumer*/);
}
channel.QueueDeclare(
queue: queueName,
durable: false,
exclusive: false,
autoDelete: false,
arguments: null);
var consumer = new EventingBasicConsumer(channel);
void received(object ch, BasicDeliverEventArgs args)
{
try
{
var body = args.Body.Span;
TModel model = JsonSerializer.Deserialize <TModel>(body);
onConsumedCallback.Invoke(model);
if (!autoAck && channel.IsOpen)
{
channel.BasicAck(args.DeliveryTag, false);
}
}
catch (Exception ex)
{
if (!autoAck && channel.IsOpen)
{
channel.BasicNack(args.DeliveryTag, false, requeue);
}
logger?.LogE(ex);
if (throwsException)
{
error = ex;
}
resetEvent.Set();
}
}
void shutdown(object ch, ShutdownEventArgs args)
{
consumer.Received -= received;
consumer.Shutdown -= shutdown;
try
{
resetEvent.Set();
}
catch (ObjectDisposedException) { /*disposed*/ }
};
consumer.Received += received;
consumer.Shutdown += shutdown;
channel.BasicConsume(
queue: queueName,
autoAck: autoAck,
consumer: consumer);
bool result = resetEvent.WaitOne();
if (result && throwsException && error != null)
{
throw new AggregateException(error);
}
return(!result);
}
}
catch (Exception)
{
Unregister <TModel>(queueName);
throw;
}
}
static AmqpConnectionWrapper()
{
locker = new object();
instance = new AmqpConnectionWrapper();
}
