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Moved using statements to EventBusRabbitMQ project

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This commit is contained in:
Sumit Ghosh 2021-10-13 16:36:50 +05:30
parent 783c69974a
commit 4ed086f675
3 changed files with 384 additions and 417 deletions
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235
src/BuildingBlocks/EventBus/EventBusRabbitMQ/DefaultRabbitMQPersistentConnection.cs
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@ -1,131 +1,120 @@
using Microsoft.Extensions.Logging; namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ;
using Polly;
using Polly.Retry;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using RabbitMQ.Client.Exceptions;
using System;
using System.IO;
using System.Net.Sockets;
namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ public class DefaultRabbitMQPersistentConnection
: IRabbitMQPersistentConnection
{ {
public class DefaultRabbitMQPersistentConnection private readonly IConnectionFactory _connectionFactory;
: IRabbitMQPersistentConnection private readonly ILogger<DefaultRabbitMQPersistentConnection> _logger;
private readonly int _retryCount;
IConnection _connection;
bool _disposed;
object sync_root = new object();
public DefaultRabbitMQPersistentConnection(IConnectionFactory connectionFactory, ILogger<DefaultRabbitMQPersistentConnection> logger, int retryCount = 5)
{ {
private readonly IConnectionFactory _connectionFactory; _connectionFactory = connectionFactory ?? throw new ArgumentNullException(nameof(connectionFactory));
private readonly ILogger<DefaultRabbitMQPersistentConnection> _logger; _logger = logger ?? throw new ArgumentNullException(nameof(logger));
private readonly int _retryCount; _retryCount = retryCount;
IConnection _connection; }
bool _disposed;
object sync_root = new object(); public bool IsConnected
{
public DefaultRabbitMQPersistentConnection(IConnectionFactory connectionFactory, ILogger<DefaultRabbitMQPersistentConnection> logger, int retryCount = 5) get
{ {
_connectionFactory = connectionFactory ?? throw new ArgumentNullException(nameof(connectionFactory)); return _connection != null && _connection.IsOpen && !_disposed;
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
_retryCount = retryCount;
}
public bool IsConnected
{
get
{
return _connection != null && _connection.IsOpen && !_disposed;
}
}
public IModel CreateModel()
{
if (!IsConnected)
{
throw new InvalidOperationException("No RabbitMQ connections are available to perform this action");
}
return _connection.CreateModel();
}
public void Dispose()
{
if (_disposed) return;
_disposed = true;
try
{
_connection.Dispose();
}
catch (IOException ex)
{
_logger.LogCritical(ex.ToString());
}
}
public bool TryConnect()
{
_logger.LogInformation("RabbitMQ Client is trying to connect");
lock (sync_root)
{
var policy = RetryPolicy.Handle<SocketException>()
.Or<BrokerUnreachableException>()
.WaitAndRetry(_retryCount, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)), (ex, time) =>
{
_logger.LogWarning(ex, "RabbitMQ Client could not connect after {TimeOut}s ({ExceptionMessage})", $"{time.TotalSeconds:n1}", ex.Message);
}
);
policy.Execute(() =>
{
_connection = _connectionFactory
.CreateConnection();
});
if (IsConnected)
{
_connection.ConnectionShutdown += OnConnectionShutdown;
_connection.CallbackException += OnCallbackException;
_connection.ConnectionBlocked += OnConnectionBlocked;
_logger.LogInformation("RabbitMQ Client acquired a persistent connection to '{HostName}' and is subscribed to failure events", _connection.Endpoint.HostName);
return true;
}
else
{
_logger.LogCritical("FATAL ERROR: RabbitMQ connections could not be created and opened");
return false;
}
}
}
private void OnConnectionBlocked(object sender, ConnectionBlockedEventArgs e)
{
if (_disposed) return;
_logger.LogWarning("A RabbitMQ connection is shutdown. Trying to re-connect...");
TryConnect();
}
void OnCallbackException(object sender, CallbackExceptionEventArgs e)
{
if (_disposed) return;
_logger.LogWarning("A RabbitMQ connection throw exception. Trying to re-connect...");
TryConnect();
}
void OnConnectionShutdown(object sender, ShutdownEventArgs reason)
{
if (_disposed) return;
_logger.LogWarning("A RabbitMQ connection is on shutdown. Trying to re-connect...");
TryConnect();
} }
} }
public IModel CreateModel()
{
if (!IsConnected)
{
throw new InvalidOperationException("No RabbitMQ connections are available to perform this action");
}
return _connection.CreateModel();
}
public void Dispose()
{
if (_disposed) return;
_disposed = true;
try
{
_connection.Dispose();
}
catch (IOException ex)
{
_logger.LogCritical(ex.ToString());
}
}
public bool TryConnect()
{
_logger.LogInformation("RabbitMQ Client is trying to connect");
lock (sync_root)
{
var policy = RetryPolicy.Handle<SocketException>()
.Or<BrokerUnreachableException>()
.WaitAndRetry(_retryCount, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)), (ex, time) =>
{
_logger.LogWarning(ex, "RabbitMQ Client could not connect after {TimeOut}s ({ExceptionMessage})", $"{time.TotalSeconds:n1}", ex.Message);
}
);
policy.Execute(() =>
{
_connection = _connectionFactory
.CreateConnection();
});
if (IsConnected)
{
_connection.ConnectionShutdown += OnConnectionShutdown;
_connection.CallbackException += OnCallbackException;
_connection.ConnectionBlocked += OnConnectionBlocked;
_logger.LogInformation("RabbitMQ Client acquired a persistent connection to '{HostName}' and is subscribed to failure events", _connection.Endpoint.HostName);
return true;
}
else
{
_logger.LogCritical("FATAL ERROR: RabbitMQ connections could not be created and opened");
return false;
}
}
}
private void OnConnectionBlocked(object sender, ConnectionBlockedEventArgs e)
{
if (_disposed) return;
_logger.LogWarning("A RabbitMQ connection is shutdown. Trying to re-connect...");
TryConnect();
}
void OnCallbackException(object sender, CallbackExceptionEventArgs e)
{
if (_disposed) return;
_logger.LogWarning("A RabbitMQ connection throw exception. Trying to re-connect...");
TryConnect();
}
void OnConnectionShutdown(object sender, ShutdownEventArgs reason)
{
if (_disposed) return;
_logger.LogWarning("A RabbitMQ connection is on shutdown. Trying to re-connect...");
TryConnect();
}
} }

550
src/BuildingBlocks/EventBus/EventBusRabbitMQ/EventBusRabbitMQ.cs
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@ -1,297 +1,279 @@
using Autofac; namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ;
using Microsoft.eShopOnContainers.BuildingBlocks.EventBus;
using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Abstractions;
using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Events;
using Microsoft.eShopOnContainers.BuildingBlocks.EventBus.Extensions;
using Microsoft.Extensions.Logging;
using Polly;
using Polly.Retry;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using RabbitMQ.Client.Exceptions;
using System;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Text.Json;
namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ public class EventBusRabbitMQ : IEventBus, IDisposable
{ {
public class EventBusRabbitMQ : IEventBus, IDisposable const string BROKER_NAME = "eshop_event_bus";
const string AUTOFAC_SCOPE_NAME = "eshop_event_bus";
private readonly IRabbitMQPersistentConnection _persistentConnection;
private readonly ILogger<EventBusRabbitMQ> _logger;
private readonly IEventBusSubscriptionsManager _subsManager;
private readonly ILifetimeScope _autofac;
private readonly int _retryCount;
private IModel _consumerChannel;
private string _queueName;
public EventBusRabbitMQ(IRabbitMQPersistentConnection persistentConnection, ILogger<EventBusRabbitMQ> logger,
ILifetimeScope autofac, IEventBusSubscriptionsManager subsManager, string queueName = null, int retryCount = 5)
{ {
const string BROKER_NAME = "eshop_event_bus"; _persistentConnection = persistentConnection ?? throw new ArgumentNullException(nameof(persistentConnection));
const string AUTOFAC_SCOPE_NAME = "eshop_event_bus"; _logger = logger ?? throw new ArgumentNullException(nameof(logger));
_subsManager = subsManager ?? new InMemoryEventBusSubscriptionsManager();
_queueName = queueName;
_consumerChannel = CreateConsumerChannel();
_autofac = autofac;
_retryCount = retryCount;
_subsManager.OnEventRemoved += SubsManager_OnEventRemoved;
}
private readonly IRabbitMQPersistentConnection _persistentConnection; private void SubsManager_OnEventRemoved(object sender, string eventName)
private readonly ILogger<EventBusRabbitMQ> _logger; {
private readonly IEventBusSubscriptionsManager _subsManager; if (!_persistentConnection.IsConnected)
private readonly ILifetimeScope _autofac;
private readonly int _retryCount;
private IModel _consumerChannel;
private string _queueName;
public EventBusRabbitMQ(IRabbitMQPersistentConnection persistentConnection, ILogger<EventBusRabbitMQ> logger,
ILifetimeScope autofac, IEventBusSubscriptionsManager subsManager, string queueName = null, int retryCount = 5)
{ {
_persistentConnection = persistentConnection ?? throw new ArgumentNullException(nameof(persistentConnection)); _persistentConnection.TryConnect();
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
_subsManager = subsManager ?? new InMemoryEventBusSubscriptionsManager();
_queueName = queueName;
_consumerChannel = CreateConsumerChannel();
_autofac = autofac;
_retryCount = retryCount;
_subsManager.OnEventRemoved += SubsManager_OnEventRemoved;
} }
private void SubsManager_OnEventRemoved(object sender, string eventName) using (var channel = _persistentConnection.CreateModel())
{ {
if (!_persistentConnection.IsConnected) channel.QueueUnbind(queue: _queueName,
exchange: BROKER_NAME,
routingKey: eventName);
if (_subsManager.IsEmpty)
{ {
_persistentConnection.TryConnect(); _queueName = string.Empty;
} _consumerChannel.Close();
using (var channel = _persistentConnection.CreateModel())
{
channel.QueueUnbind(queue: _queueName,
exchange: BROKER_NAME,
routingKey: eventName);
if (_subsManager.IsEmpty)
{
_queueName = string.Empty;
_consumerChannel.Close();
}
}
}
public void Publish(IntegrationEvent @event)
{
if (!_persistentConnection.IsConnected)
{
_persistentConnection.TryConnect();
}
var policy = RetryPolicy.Handle<BrokerUnreachableException>()
.Or<SocketException>()
.WaitAndRetry(_retryCount, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)), (ex, time) =>
{
_logger.LogWarning(ex, "Could not publish event: {EventId} after {Timeout}s ({ExceptionMessage})", @event.Id, $"{time.TotalSeconds:n1}", ex.Message);
});
var eventName = @event.GetType().Name;
_logger.LogTrace("Creating RabbitMQ channel to publish event: {EventId} ({EventName})", @event.Id, eventName);
using (var channel = _persistentConnection.CreateModel())
{
_logger.LogTrace("Declaring RabbitMQ exchange to publish event: {EventId}", @event.Id);
channel.ExchangeDeclare(exchange: BROKER_NAME, type: "direct");
var body = JsonSerializer.SerializeToUtf8Bytes(@event, @event.GetType(), new JsonSerializerOptions
{
WriteIndented = true
});
policy.Execute(() =>
{
var properties = channel.CreateBasicProperties();
properties.DeliveryMode = 2; // persistent
_logger.LogTrace("Publishing event to RabbitMQ: {EventId}", @event.Id);
channel.BasicPublish(
exchange: BROKER_NAME,
routingKey: eventName,
mandatory: true,
basicProperties: properties,
body: body);
});
}
}
public void SubscribeDynamic<TH>(string eventName)
where TH : IDynamicIntegrationEventHandler
{
_logger.LogInformation("Subscribing to dynamic event {EventName} with {EventHandler}", eventName, typeof(TH).GetGenericTypeName());
DoInternalSubscription(eventName);
_subsManager.AddDynamicSubscription<TH>(eventName);
StartBasicConsume();
}
public void Subscribe<T, TH>()
where T : IntegrationEvent
where TH : IIntegrationEventHandler<T>
{
var eventName = _subsManager.GetEventKey<T>();
DoInternalSubscription(eventName);
_logger.LogInformation("Subscribing to event {EventName} with {EventHandler}", eventName, typeof(TH).GetGenericTypeName());
_subsManager.AddSubscription<T, TH>();
StartBasicConsume();
}
private void DoInternalSubscription(string eventName)
{
var containsKey = _subsManager.HasSubscriptionsForEvent(eventName);
if (!containsKey)
{
if (!_persistentConnection.IsConnected)
{
_persistentConnection.TryConnect();
}
_consumerChannel.QueueBind(queue: _queueName,
exchange: BROKER_NAME,
routingKey: eventName);
}
}
public void Unsubscribe<T, TH>()
where T : IntegrationEvent
where TH : IIntegrationEventHandler<T>
{
var eventName = _subsManager.GetEventKey<T>();
_logger.LogInformation("Unsubscribing from event {EventName}", eventName);
_subsManager.RemoveSubscription<T, TH>();
}
public void UnsubscribeDynamic<TH>(string eventName)
where TH : IDynamicIntegrationEventHandler
{
_subsManager.RemoveDynamicSubscription<TH>(eventName);
}
public void Dispose()
{
if (_consumerChannel != null)
{
_consumerChannel.Dispose();
}
_subsManager.Clear();
}
private void StartBasicConsume()
{
_logger.LogTrace("Starting RabbitMQ basic consume");
if (_consumerChannel != null)
{
var consumer = new AsyncEventingBasicConsumer(_consumerChannel);
consumer.Received += Consumer_Received;
_consumerChannel.BasicConsume(
queue: _queueName,
autoAck: false,
consumer: consumer);
}
else
{
_logger.LogError("StartBasicConsume can't call on _consumerChannel == null");
}
}
private async Task Consumer_Received(object sender, BasicDeliverEventArgs eventArgs)
{
var eventName = eventArgs.RoutingKey;
var message = Encoding.UTF8.GetString(eventArgs.Body.Span);
try
{
if (message.ToLowerInvariant().Contains("throw-fake-exception"))
{
throw new InvalidOperationException($"Fake exception requested: \"{message}\"");
}
await ProcessEvent(eventName, message);
}
catch (Exception ex)
{
_logger.LogWarning(ex, "----- ERROR Processing message \"{Message}\"", message);
}
// Even on exception we take the message off the queue.
// in a REAL WORLD app this should be handled with a Dead Letter Exchange (DLX).
// For more information see: https://www.rabbitmq.com/dlx.html
_consumerChannel.BasicAck(eventArgs.DeliveryTag, multiple: false);
}
private IModel CreateConsumerChannel()
{
if (!_persistentConnection.IsConnected)
{
_persistentConnection.TryConnect();
}
_logger.LogTrace("Creating RabbitMQ consumer channel");
var channel = _persistentConnection.CreateModel();
channel.ExchangeDeclare(exchange: BROKER_NAME,
type: "direct");
channel.QueueDeclare(queue: _queueName,
durable: true,
exclusive: false,
autoDelete: false,
arguments: null);
channel.CallbackException += (sender, ea) =>
{
_logger.LogWarning(ea.Exception, "Recreating RabbitMQ consumer channel");
_consumerChannel.Dispose();
_consumerChannel = CreateConsumerChannel();
StartBasicConsume();
};
return channel;
}
private async Task ProcessEvent(string eventName, string message)
{
_logger.LogTrace("Processing RabbitMQ event: {EventName}", eventName);
if (_subsManager.HasSubscriptionsForEvent(eventName))
{
using (var scope = _autofac.BeginLifetimeScope(AUTOFAC_SCOPE_NAME))
{
var subscriptions = _subsManager.GetHandlersForEvent(eventName);
foreach (var subscription in subscriptions)
{
if (subscription.IsDynamic)
{
var handler = scope.ResolveOptional(subscription.HandlerType) as IDynamicIntegrationEventHandler;
if (handler == null) continue;
using dynamic eventData = JsonDocument.Parse(message);
await Task.Yield();
await handler.Handle(eventData);
}
else
{
var handler = scope.ResolveOptional(subscription.HandlerType);
if (handler == null) continue;
var eventType = _subsManager.GetEventTypeByName(eventName);
var integrationEvent = JsonSerializer.Deserialize(message, eventType, new JsonSerializerOptions() { PropertyNameCaseInsensitive= true});
var concreteType = typeof(IIntegrationEventHandler<>).MakeGenericType(eventType);
await Task.Yield();
await (Task)concreteType.GetMethod("Handle").Invoke(handler, new object[] { integrationEvent });
}
}
}
}
else
{
_logger.LogWarning("No subscription for RabbitMQ event: {EventName}", eventName);
} }
} }
} }
public void Publish(IntegrationEvent @event)
{
if (!_persistentConnection.IsConnected)
{
_persistentConnection.TryConnect();
}
var policy = RetryPolicy.Handle<BrokerUnreachableException>()
.Or<SocketException>()
.WaitAndRetry(_retryCount, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)), (ex, time) =>
{
_logger.LogWarning(ex, "Could not publish event: {EventId} after {Timeout}s ({ExceptionMessage})", @event.Id, $"{time.TotalSeconds:n1}", ex.Message);
});
var eventName = @event.GetType().Name;
_logger.LogTrace("Creating RabbitMQ channel to publish event: {EventId} ({EventName})", @event.Id, eventName);
using (var channel = _persistentConnection.CreateModel())
{
_logger.LogTrace("Declaring RabbitMQ exchange to publish event: {EventId}", @event.Id);
channel.ExchangeDeclare(exchange: BROKER_NAME, type: "direct");
var body = JsonSerializer.SerializeToUtf8Bytes(@event, @event.GetType(), new JsonSerializerOptions
{
WriteIndented = true
});
policy.Execute(() =>
{
var properties = channel.CreateBasicProperties();
properties.DeliveryMode = 2; // persistent
_logger.LogTrace("Publishing event to RabbitMQ: {EventId}", @event.Id);
channel.BasicPublish(
exchange: BROKER_NAME,
routingKey: eventName,
mandatory: true,
basicProperties: properties,
body: body);
});
}
}
public void SubscribeDynamic<TH>(string eventName)
where TH : IDynamicIntegrationEventHandler
{
_logger.LogInformation("Subscribing to dynamic event {EventName} with {EventHandler}", eventName, typeof(TH).GetGenericTypeName());
DoInternalSubscription(eventName);
_subsManager.AddDynamicSubscription<TH>(eventName);
StartBasicConsume();
}
public void Subscribe<T, TH>()
where T : IntegrationEvent
where TH : IIntegrationEventHandler<T>
{
var eventName = _subsManager.GetEventKey<T>();
DoInternalSubscription(eventName);
_logger.LogInformation("Subscribing to event {EventName} with {EventHandler}", eventName, typeof(TH).GetGenericTypeName());
_subsManager.AddSubscription<T, TH>();
StartBasicConsume();
}
private void DoInternalSubscription(string eventName)
{
var containsKey = _subsManager.HasSubscriptionsForEvent(eventName);
if (!containsKey)
{
if (!_persistentConnection.IsConnected)
{
_persistentConnection.TryConnect();
}
_consumerChannel.QueueBind(queue: _queueName,
exchange: BROKER_NAME,
routingKey: eventName);
}
}
public void Unsubscribe<T, TH>()
where T : IntegrationEvent
where TH : IIntegrationEventHandler<T>
{
var eventName = _subsManager.GetEventKey<T>();
_logger.LogInformation("Unsubscribing from event {EventName}", eventName);
_subsManager.RemoveSubscription<T, TH>();
}
public void UnsubscribeDynamic<TH>(string eventName)
where TH : IDynamicIntegrationEventHandler
{
_subsManager.RemoveDynamicSubscription<TH>(eventName);
}
public void Dispose()
{
if (_consumerChannel != null)
{
_consumerChannel.Dispose();
}
_subsManager.Clear();
}
private void StartBasicConsume()
{
_logger.LogTrace("Starting RabbitMQ basic consume");
if (_consumerChannel != null)
{
var consumer = new AsyncEventingBasicConsumer(_consumerChannel);
consumer.Received += Consumer_Received;
_consumerChannel.BasicConsume(
queue: _queueName,
autoAck: false,
consumer: consumer);
}
else
{
_logger.LogError("StartBasicConsume can't call on _consumerChannel == null");
}
}
private async Task Consumer_Received(object sender, BasicDeliverEventArgs eventArgs)
{
var eventName = eventArgs.RoutingKey;
var message = Encoding.UTF8.GetString(eventArgs.Body.Span);
try
{
if (message.ToLowerInvariant().Contains("throw-fake-exception"))
{
throw new InvalidOperationException($"Fake exception requested: \"{message}\"");
}
await ProcessEvent(eventName, message);
}
catch (Exception ex)
{
_logger.LogWarning(ex, "----- ERROR Processing message \"{Message}\"", message);
}
// Even on exception we take the message off the queue.
// in a REAL WORLD app this should be handled with a Dead Letter Exchange (DLX).
// For more information see: https://www.rabbitmq.com/dlx.html
_consumerChannel.BasicAck(eventArgs.DeliveryTag, multiple: false);
}
private IModel CreateConsumerChannel()
{
if (!_persistentConnection.IsConnected)
{
_persistentConnection.TryConnect();
}
_logger.LogTrace("Creating RabbitMQ consumer channel");
var channel = _persistentConnection.CreateModel();
channel.ExchangeDeclare(exchange: BROKER_NAME,
type: "direct");
channel.QueueDeclare(queue: _queueName,
durable: true,
exclusive: false,
autoDelete: false,
arguments: null);
channel.CallbackException += (sender, ea) =>
{
_logger.LogWarning(ea.Exception, "Recreating RabbitMQ consumer channel");
_consumerChannel.Dispose();
_consumerChannel = CreateConsumerChannel();
StartBasicConsume();
};
return channel;
}
private async Task ProcessEvent(string eventName, string message)
{
_logger.LogTrace("Processing RabbitMQ event: {EventName}", eventName);
if (_subsManager.HasSubscriptionsForEvent(eventName))
{
using (var scope = _autofac.BeginLifetimeScope(AUTOFAC_SCOPE_NAME))
{
var subscriptions = _subsManager.GetHandlersForEvent(eventName);
foreach (var subscription in subscriptions)
{
if (subscription.IsDynamic)
{
var handler = scope.ResolveOptional(subscription.HandlerType) as IDynamicIntegrationEventHandler;
if (handler == null) continue;
using dynamic eventData = JsonDocument.Parse(message);
await Task.Yield();
await handler.Handle(eventData);
}
else
{
var handler = scope.ResolveOptional(subscription.HandlerType);
if (handler == null) continue;
var eventType = _subsManager.GetEventTypeByName(eventName);
var integrationEvent = JsonSerializer.Deserialize(message, eventType, new JsonSerializerOptions() { PropertyNameCaseInsensitive= true});
var concreteType = typeof(IIntegrationEventHandler<>).MakeGenericType(eventType);
await Task.Yield();
await (Task)concreteType.GetMethod("Handle").Invoke(handler, new object[] { integrationEvent });
}
}
}
}
else
{
_logger.LogWarning("No subscription for RabbitMQ event: {EventName}", eventName);
}
}
} }

16
src/BuildingBlocks/EventBus/EventBusRabbitMQ/IRabbitMQPersistentConnection.cs
View File

@ -1,15 +1,11 @@
using RabbitMQ.Client; namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ;
using System;
namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ public interface IRabbitMQPersistentConnection
: IDisposable
{ {
public interface IRabbitMQPersistentConnection bool IsConnected { get; }
: IDisposable
{
bool IsConnected { get; }
bool TryConnect(); bool TryConnect();
IModel CreateModel(); IModel CreateModel();
}
} }