static async Task UsePulsarClient(string topic, CancellationToken cancel)
{
var client = new PulsarClientBuilder()
.ServiceUrl("pulsar://pulsar:6650")
.Build();
var producer = await client.NewProducer()
.Topic(topic)
.CreateAsync();
var consumer = await client.NewConsumer()
.Topic(topic)
.SubscriptionName("sub")
.SubscribeAsync();
var messageId = await producer.SendAsync(Encoding.UTF8.GetBytes($"Sent from C# at '{DateTime.Now}'"));
Console.WriteLine($"MessageId is: '{messageId}'");
var message = await consumer.ReceiveAsync();
Console.WriteLine($"Received: {Encoding.UTF8.GetString(message.Data)}");
await consumer.AcknowledgeAsync(message.MessageId);
}
static async Task Main(string[] args)
{
var subscription = "pulsar-dead-letter-tester";
var topic = $"public/default/{Guid.NewGuid()}";
var deadLetterTopic = $"{topic}-{subscription}-DLQ";
await WaitForPulsar(TimeSpan.FromSeconds(30));
// SUCCESSFUL
// await CreateTopic(topic);
// UNSUCCESSFUL
await CreateTopic(topic, 2);
string serviceUrl = "pulsar://pulsar:6650";
PulsarClient client = new PulsarClientBuilder().ServiceUrl(serviceUrl)
.Build();
var producer = await client.NewProducer().Topic(topic)
.CreateAsync();
var consumer = await client.NewConsumer().Topic(topic).ConsumerName("test").SubscriptionName(subscription)
.NegativeAckRedeliveryDelay(TimeSpan.FromSeconds(2))
.DeadLetterPolicy(new DeadLetterPolicy(maxRetry))
.SubscriptionType(SubscriptionType.Shared)
.SubscribeAsync();
var deadLetterConsumer = await client.NewConsumer().Topic(deadLetterTopic).ConsumerName("test").SubscriptionName(subscription)
.SubscriptionType(SubscriptionType.Shared)
.SubscribeAsync();
await producer.SendAsync(System.Text.Encoding.UTF8.GetBytes(Guid.NewGuid().ToString()));
var consumerTask = ConsumeTopic(consumer);
var deadLetterConsumerTask = ConsumeDeadLetterTopic(deadLetterConsumer);
Task.WaitAny(new[]
{
consumerTask, deadLetterConsumerTask
});
if (consumerTask.IsFaulted)
{
throw consumerTask.Exception;
}
if (deadLetterConsumerTask.IsCompletedSuccessfully)
{
Console.WriteLine("Successfully moved to dead letter queue!");
return;
}
if (!consumerTask.IsCompleted)
{
throw new Exception("No new messages but no dead letter messages either.");
}
}