public Task <bool> ReceiveMessageAsync()
{
try
{
_logger.LogInformation($"Begin to receive the message queue of Rabbit MQ: {_connectString}");
var factory = new ConnectionFactory()
{
HostName = _connectString, DispatchConsumersAsync = true
};
using var connection = factory.CreateConnection();
using var channel = connection.CreateModel();
Console.WriteLine("======================================================");
Console.WriteLine("Press ENTER key to exit after receiving all the messages of RabbitMQ.");
Console.WriteLine("======================================================");
_logger.LogInformation($"Declare a new chanel with queue name {_queueName}");
channel.QueueDeclare(queue: _queueName,
durable: false,
exclusive: false,
autoDelete: false,
arguments: null);
var consumer = new AsyncEventingBasicConsumer(channel);
consumer.Received += async(model, ea) =>
{
var body = ea.Body;//Maybe fix "Convert ReadOnlyMemory<byte> to byte[]": .ToArray()
var messageBody = Encoding.UTF8.GetString(body.Span);
// await SaveData.Execute(messageBody, _bookService);
_logger.LogInformation($"Start to process the message body: {messageBody}");
await _saveData.ExecuteQuery(messageBody);
};
channel.BasicConsume(queue: _queueName,
autoAck: true,
consumer: consumer);
_logger.LogInformation($"End Rabbit MQ");
Console.WriteLine(" Press [enter] to exit.");
Console.ReadLine();
}
catch (Exception ex)
{
_logger.LogError($"An error occurred {ex.Message}");
throw ex;
}
return(Task.FromResult(true));
}
async System.Threading.Tasks.Task ProcessMessagesAsync(Message message, CancellationToken token)
{
string messageBody = Encoding.UTF8.GetString(message.Body);
// Console.WriteLine(messageInfo.actionType.ToUpper() + " successful." + Environment.NewLine);
// Complete the message so that it is not received again.
// This can be done only if the queue Client is created in ReceiveMode.PeekLock mode (which is the default).
await queueClient.CompleteAsync(message.SystemProperties.LockToken);
// _logger.LogInformation($"Saved message Number: {message.SystemProperties.SequenceNumber}");
//Console.WriteLine($"Saved message Number: {message.SystemProperties.SequenceNumber}"+ Environment.NewLine);
// Note: Use the cancellationToken passed as necessary to determine if the queueClient has already been closed.
// If queueClient has already been closed, you can choose to not call CompleteAsync() or AbandonAsync() etc.
// to avoid unnecessary exceptions.
// Process the message.
_logger.LogInformation($"Start to process the message body: {messageBody}");
await _saveData.ExecuteQuery(messageBody);
}
public Task <bool> ReceiveMessageAsync()
{
Console.WriteLine("======================================================");
Console.WriteLine("Press ENTER key to exit after receiving all the messages of NATS.");
Console.WriteLine("======================================================");
// Create a new connection factory to create
// a connection.
ConnectionFactory cf = new ConnectionFactory();
// Creates a live connection to the default
// NATS Server running locally
_client = cf.CreateConnection(_connectionString);
// Setup an event handler to process incoming messages.
// An anonymous delegate function is used for brevity.
EventHandler <MsgHandlerEventArgs> h = (sender, args) =>
{
// print the message
//Console.WriteLine(args.Message);
var messageBody = Encoding.UTF8.GetString(args.Message.Data);
_saveData.ExecuteQuery(messageBody);
// Here are some of the accessible properties from
// the message:
// args.Message.Data;
// args.Message.Reply;
// args.Message.Subject;
// args.Message.ArrivalSubcription.Subject;
// args.Message.ArrivalSubcription.QueuedMessageCount;
// args.Message.ArrivalSubcription.Queue;
// Unsubscribing from within the delegate function is supported.
// args.Message.ArrivalSubcription.Unsubscribe();
};
// The simple way to create an asynchronous subscriber
// is to simply pass the event in. Messages will start
// arriving immediately.
IAsyncSubscription s = _client.SubscribeAsync(_queueName, h);
Console.ReadLine();
s.Unsubscribe();
return(Task.FromResult(true));
}