public void VacationEventHandler()
{
var conf = new Dictionary <string, object>
{
{ "group.id", "vacation-group" },
{ "bootstrap.servers", "localhost:9092" },
{ "auto.commit.interval.ms", 5000 },
{ "auto.offset.reset", "earliest" }
};
using (var consumer = new Consumer <Null, string>(conf, null, new StringDeserializer(Encoding.UTF8)))
{
consumer.OnMessage += (_, msg)
=>
{
VacationCreated vacationCreated = JsonConvert.DeserializeObject <VacationCreated>(msg.Value);
Console.WriteLine($"Read '{msg.Value}' from: {msg.TopicPartitionOffset}");
//write to mongodb
WriteToMongoDb(vacationCreated);
//raise message in Kafka
PublishEvent("vacation.request.received", vacationCreated);
};
consumer.OnError += (_, error)
=> Console.WriteLine($"Error: {error}");
consumer.OnConsumeError += (_, msg)
=> Console.WriteLine($"Consume error ({msg.TopicPartitionOffset}): {msg.Error}");
consumer.Subscribe("vacation.requested");
consumer.Poll(100);
}
}
void PublishEvent(string eventId, VacationCreated vacationCreated)
{
var config = new Dictionary <string, object>
{
{ "bootstrap.servers", "localhost:9092" }
};
Producer <string, string> producer = null;
try
{
producer = new Producer <string, string>(config, new StringSerializer(Encoding.UTF8), new StringSerializer(Encoding.UTF8));
producer.ProduceAsync("vacation.request.received", vacationCreated.Id.ToString(), JsonConvert.SerializeObject(vacationCreated));
}
finally
{
if (producer != null)
{
producer.Dispose();
}
}
}
void WriteToMongoDb(VacationCreated vacationCreated)
{
// Create a New HttpClient object.
HttpClient client = new HttpClient();
CreateVacation createVacation = new CreateVacation(vacationCreated.Data.EmployeeId, vacationCreated.Data);
// Call asynchronous network methods in a try/catch block to handle exceptions
try
{
client.PostAsync("http://v1/api/vacationHandler/Vacation", new JsonContent(createVacation)).Wait();
}
catch (HttpRequestException e)
{
Console.WriteLine("\nException Caught!");
Console.WriteLine("Message :{0} ", e.Message);
}
// Need to call dispose on the HttpClient object
// when done using it, so the app doesn't leak resources
client.Dispose();
}
