protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
_logger.LogInformation("Booking Processing Service Started");
// Magic line to yield control of this background service back to the rest of the startup process
await Task.Yield();
// Create new consumer and producer
var kafkaConsumerService = new KafkaConsumerService(_logger, _consumerConfig, KafkaTopics.TOPIC_BOOKING_REQUEST);
var kafkaProducerService = new KafkaProducerService(_logger, _producerConfig, KafkaTopics.TOPIC_BOOKING_CONFIRMATION);
while (!stoppingToken.IsCancellationRequested)
{
try
{
// Wait for a new booking request
var bookingRequest = kafkaConsumerService.WaitAndRead <MovieBooking>(stoppingToken);
if (bookingRequest != null)
{
_logger.LogInformation($"Processing new booking: {bookingRequest}");
// Create new booking confirmation based on a request
var bookingConfirmation = new BookingConfirmation(bookingRequest);
// Publish a booking confirmation to a Kafka stream
await kafkaProducerService.Write(bookingConfirmation);
}
}
catch (Exception e)
{
_logger.LogError($"Error in processing : {e.Message}");
}
}
}
static void Main(string[] args)
{
CancellationTokenSource token = new CancellationTokenSource();
Console.CancelKeyPress += (_, e) =>
{
e.Cancel = true;
token.Cancel();
};
// Create consumer config
var conf = new ConsumerConfig
{
GroupId = "kafka_test_cli",
BootstrapServers = "localhost:9092",
AutoOffsetReset = AutoOffsetReset.Earliest,
EnablePartitionEof = true,
};
// Create a logger
var loggerFactory = LoggerFactory.Create(builder =>
{
builder
.AddConsole()
.AddDebug();
});
ILogger <Program> logger = loggerFactory.CreateLogger <Program>();
logger.LogInformation("Consumer CLI started");
// Create Kafka consumer and consume messages
var kafkaConsumerService = new KafkaConsumerService(logger, conf, "topic_booking_request");
try
{
while (!token.IsCancellationRequested)
{
var bookingRequest = kafkaConsumerService.WaitAndRead(token.Token);
if (bookingRequest != null)
{
Console.WriteLine($"Consumed message '{bookingRequest}'");
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
}