public RabbitContext(MessageQueueSettings settings, ILogger logger)
{
var rabbitConnFactory = new ConnectionFactory
{
HostName = settings.Hostname,
UserName = settings.Username,
Password = settings.Password,
RequestedHeartbeat = 60,
AutomaticRecoveryEnabled = true,
TopologyRecoveryEnabled = true,
NetworkRecoveryInterval = TimeSpan.FromSeconds(5)
};
_connection = rabbitConnFactory.CreateConnection();
_logger = logger;
using (var channel = _connection.CreateModel())
{
channel.ExchangeDeclare(exchange: ExchangeName, type: ExchangeType.Topic, durable: true, autoDelete: false, arguments: null);
channel.QueueDeclare(queue: QueueName, durable: true, exclusive: false, autoDelete: false);
channel.QueueBind(QueueName, ExchangeName, RoutingKey, null);
}
}
// http://stackoverflow.com/questions/16658915/reactive-extensions-concurrency-within-the-subscriber
// https://social.msdn.microsoft.com/Forums/en-US/6ef0caba-709d-450a-830d-8fc80f0a815d/the-rx-serialization-guarantee?forum=rx
private static async Task RabbitMqObserver(ILogger logger, CancellationToken cancellationToken = default(CancellationToken))
{
logger.LogInformation("ConcurrencyLevel: {concurrencyLevel}", ConcurrencyLevel);
Sleep(logger, TimeSpan.FromSeconds(10), "to let RabbitMQ start up");
var config = ConfigBuilder.Build();
var settings = new MessageQueueSettings();
ConfigurationBinder.Bind(config.GetSection("MessageQueue"), settings);
using (var context = new RabbitContext(settings, logger))
{
var publisher = Task.Run(async() =>
{
do
{
context.Publish(new Bogus.Faker().Lorem.Sentence(20));
await Task.Delay(TimeSpan.FromMilliseconds(100));
} while (cancellationToken.IsCancellationRequested == false);
});
var subscriber = Task.Run(async() =>
{
Action <IMessage <string> > onNextImpl = message =>
{
logger.LogDebug("Started handling {messageId}", message.Id);
try
{
Thread.Sleep(3000);
Console.WriteLine(message.GetContent());
message.CompleteAsync().Wait();
}
catch (Exception ex)
{
logger.LogError(0, ex, "Error while handling {messageId}", message.Id);
message.AbandonAsync().Wait();
}
};
// Action to invoke for each element in the observable sequence.
Action <IMessage <string> > onNext = message => Task.Run(() => onNextImpl(message));
// Action to invoke upon exceptional termination of the observable sequence
Action <Exception> onError = ex =>
{
logger.LogError(0, ex, "Exceptional termination of the observable sequence");
};
// Action to invoke upon graceful termination of the observable sequence.
Action onCompleted = () =>
{
logger.LogDebug("Graceful termination of the observable sequence");
};
using (var subscription = context.CreateSubscription())
using (subscription.Observable.ObserveOn(NewThreadScheduler.Default).Subscribe(onNext, onError, onCompleted))
{
await SleepTillCancelledAsync(cancellationToken);
}
});
await Task.WhenAll(publisher, subscriber);
}
}