internal HostOperation(
OperationConfiguration <TRequest, TResponse> operation,
HostOperationSettings settings)
{
ServiceName = settings.ServiceName;
ExchangeName = settings.ExchangeName;
Serializer = settings.Serializer;
Logger = settings.Logger;
_operation = operation;
_connection = settings.Connection;
_models = new Dictionary <string, HostModel>();
CreateQueue();
for (var i = 0; i < NumberOfConsumers; i++)
{
var model = _connection.CreateModel();
var consumer = new AsyncEventingBasicConsumer(model);
var consumerTag = model.BasicConsume(QueueName, true, consumer);
consumer.Received += OnMessageReceived;
_models.Add(consumerTag, new HostModel(model, consumerTag));
}
}
internal HostOperation(
OperationConfiguration <TRequest, TResponse> operation,
HostOperationSettings settings)
{
ServiceName = settings.ServiceName;
ExchangeName = settings.ExchangeName;
Serializer = settings.Serializer;
Logger = settings.Logger;
_operation = operation;
_connection = settings.Connection;
_model = _connection.CreateModel();
var queueName = QueueName;
_model.QueueDeclare(queueName, true, false, false);
_model.QueueBind(queueName, ExchangeName, operation.OperationName);
var consumer = new EventingBasicConsumer(_model);
_model.BasicConsume(queueName, false, consumer);
consumer.Received += OnMessageReceived;
}
public async Task StartAsync()
{
Logger.Log(LogLevel.Trace, "Starting CQRS host");
try
{
if (_lock == null || _disposed)
{
throw new ObjectDisposedException(nameof(CQRSHost));
}
await _lock.WaitAsync();
if (_isStarted)
{
throw new Exception("Host already started.");
}
// Dispose the previous connection and operations (if any)
DisposeOperations();
DisposeConnection();
// Create a new RabbitMQ connection
_connection = _config.CreateConnection();
// Create the service exchange
using (var model = _connection.CreateModel())
{
model.ExchangeDeclare(ExchangeName, "direct", true, false);
}
// Create a model, queue, bindings and consumer for each operation
var hostOperationGenericType = typeof(HostOperation <,>);
var hostOperationSettings = new HostOperationSettings()
{
Connection = _connection,
Serializer = Serializer,
Logger = Logger,
ServiceName = ServiceName,
ExchangeName = ExchangeName
};
foreach (var operation in _config.Operations)
{
Type[] hostOperationTypeArgs =
{
operation.RequestType,
operation.ResponseType
};
var hostOperationType = hostOperationGenericType.MakeGenericType(hostOperationTypeArgs);
object[] hostOperationParams =
{
operation,
hostOperationSettings
};
var hostOperation = (IDisposable)Activator.CreateInstance(
hostOperationType,
BindingFlags.NonPublic | BindingFlags.Instance,
null,
hostOperationParams,
CultureInfo.InvariantCulture);
_operations.Add(hostOperation);
}
Logger.Log(LogLevel.Trace, "Started CQRS host");
_isStarted = true;
}
finally
{
_lock?.Release();
}
}