public async Task <IActiveConsumer> StartListeningQueueAsync <T>(string queueName, ConsumerOptions <T> consumerOptions, ProcessorMessageDelegate <T> messageProcessor) where T : class
{
var activeMessageProcessorCanceller = new ActiveMessageProcessorCanceller();
const string consumerTagKey = "consumerTag";
var pipeContext = new ClientPipeContextAction((channel, context) =>
{
var consumerTag = BeginConsumeQueue(channel, queueName, consumerOptions, messageProcessor, activeMessageProcessorCanceller);
context.Items[consumerTagKey] = consumerTag;
return(Task.CompletedTask);
});
await ClientPipe.ExecutePipelineAsync(pipeContext, _consumerPipeline.Value);
return(new ActiveConsumer(pipeContext.GetItemValue <string>(consumerTagKey), pipeContext.ChannelContainer !, activeMessageProcessorCanceller));
}
// create new class that handle all cancel Logic: (Create pipe too)
// - Immediate cancel: Cancel token given to the pipeline, and wait it to leave (catch in finally ?)
// - Do not cancel token, but when it's been cancelled, if a task is in progress then it should wait the task to complete.
private string BeginConsumeQueue <T>(
IModel channel,
string queueName,
ConsumerOptions <T> consumerOptions,
ProcessorMessageDelegate <T> messageProcessor,
ActiveMessageProcessorCanceller activeMessageProcessorCanceller
) where T : class
{
var consumer = new AsyncEventingBasicConsumer(channel);
consumer.Received += async(_, message) =>
{
var consumerPipeContext = new ConsumerPipeContext <T>(_options.RabbitMqConnectionManager, channel, message, messageProcessor, activeMessageProcessorCanceller);
await ConsumerPipe <T> .ExecutePipelineAsync(consumerPipeContext, consumerOptions.BuildPipeline());
};
if (consumerOptions.PrefetchCount.HasValue)
{
channel.BasicQos(0, consumerOptions.PrefetchCount.Value, false);
}
return(channel.BasicConsume(queueName, false, consumer));
}