private Task CreateChannels() => Task.Run(() =>
{
var options = this.options;
var connection = this.connection;
var controller = this.controller;
foreach (var channelOptions in options.Channels)
{
var channelModel = connection.CreateModel();
if (channelOptions.ChannelPrefetchCount.HasValue)
{
channelModel.BasicQos(0, channelOptions.ChannelPrefetchCount.Value, true);
}
if (channelOptions.ConsumerPrefetchCount.HasValue)
{
channelModel.BasicQos(0, channelOptions.ConsumerPrefetchCount.Value, false);
}
var channel = new RabbitMQChannel(channelOptions, channelModel);
channels.Add(channel.Tag, channel);
controller.On(LifecycleState.DeclareEntities, async() =>
await DeclareEntities(channel)
);
controller.On(LifecycleState.SubscribeQueues, async() =>
await SubscribeQueues(channel)
);
}
});
private async Task SubscribeQueues(RabbitMQChannel channel)
{
var services = options.Services;
var channelOptions = channel.Options;
services.GetContextAccessor()
.Set(channel);
foreach (var subscriberFactory in channelOptions.SubscribersFactories)
{
await channel.Subscribe(subscriberFactory);
}
}
public Task Initialize(RabbitMQChannel channel)
=> Task.Run(() => {
var model = channel.Model;
var consumer = new EventingBasicConsumer(model);
consumer.Received += (_, ea)
=> deliveryHandler.Handle(channel, ea)
.GetAwaiter()
.GetResult();
model.BasicConsume(
queue: queue,
autoAck: acknowledgeMode == AcknowledgeMode.Automatic,
consumer: consumer
);
});
public async Task Handle(RabbitMQChannel channel, BasicDeliverEventArgs source)
{
asyncContextAccessor.Set(channel);
var delivery = new RabbitMQDelivery(channel.Model, acknowledgeMode, source);
if (acknowledgeMode == AcknowledgeMode.BeforeHandling)
{
await delivery.TryAcknowledge();
}
try
{
await handler.Handle(delivery);
}
catch (Exception ex)
{
await delivery.SetException(ex);
}
if (delivery.Exceptions.Any())
{
switch (exceptionMode)
{
case ExceptionMode.Hold:
return;
case ExceptionMode.Reject:
await delivery.TryReject();
return;
case ExceptionMode.Unacknowledge:
await delivery.TryUnacknowledge();
return;
default: // Ignore
break;
}
}
if (acknowledgeMode == AcknowledgeMode.AfterHandling)
{
await delivery.TryAcknowledge();
}
}
private async Task DeclareEntities(RabbitMQChannel channel)
{
var services = options.Services;
var channelOptions = channel.Options;
var channelModel = channel.Model;
foreach (var exchangeOptions in channelOptions.ExchangesOptions)
{
channelModel.ExchangeDeclare(
exchangeOptions.Exchange,
exchangeOptions.Type,
exchangeOptions.Durable,
exchangeOptions.AutoDelete,
exchangeOptions.Arguments
);
}
foreach (var queueOptions in channelOptions.QueuesOptions)
{
var queueDeclaration = channelModel.QueueDeclare(
queueOptions.Queue,
queueOptions.Durable,
queueOptions.Exclusive,
queueOptions.AutoDelete,
queueOptions.Arguments
);
var queue = new RabbitMQQueue(queueOptions, queueDeclaration.QueueName);
channel.AddQueue(queue);
services.GetContextAccessor()
.Set(channel, queue);
foreach (var action in queueOptions.OnDeclaredActions)
{
await action(services);
}
}
}
public Task Initialize(RabbitMQChannel channel)
=> Task.Run(() => {
var model = channel.Model;
var queueName = model.QueueDeclare().QueueName;
model.QueueBind(
queue: queueName,
exchange: exchange,
routingKey: routingKey
);
var consumer = new EventingBasicConsumer(model);
consumer.Received += (_, ea)
=> deliveryHandler.Handle(channel, ea)
.GetAwaiter()
.GetResult();
model.BasicConsume(
queue: queueName,
autoAck: acknowledgeMode == AcknowledgeMode.Automatic,
consumer: consumer
);
});