public void Consume()
{
Task.Run(() =>
{
Console.WriteLine($"Starting Kafka subscription to {this.topic}");
using (var consumer = new Consumer <Null, string>(this.config, null, new StringDeserializer(Encoding.UTF8)))
{
consumer.OnError += (_, error) =>
Console.WriteLine($"Orders Error: {error}");
consumer.OnConsumeError += (_, error) =>
Console.WriteLine($"Orders Consume Error: {error}");
consumer.OnMessage += (_, msg) =>
Console.WriteLine($"Orders message available: {msg}");
consumer.Subscribe(new[] { this.topic });
consumer.Assign(new List <TopicPartitionOffset> {
new TopicPartitionOffset(this.topic, 0, 0)
});
//consumer.Seek(new TopicPartitionOffset(topic, 0, 0));
while (true)
{
Message <Null, string> msg;
if (consumer.Consume(out msg, TimeSpan.FromSeconds(1)))
{
Console.WriteLine($"Topic: {msg.Topic} Partition: {msg.Partition} Offset: {msg.Offset} {msg.Value}");
string rawJson = msg.Value;
try
{
OrderAcceptedEvent evt = JsonConvert.DeserializeObject <OrderAcceptedEvent>(rawJson);
this.eventProcessor.HandleOrderAcceptedEvent(evt);
var committedOffsets = consumer.CommitAsync(msg).Result;
if (committedOffsets.Error.HasError)
{
Console.WriteLine($"Failed to commit offsets : {committedOffsets.Error.Reason}");
}
}
catch (Exception ex)
{
Console.WriteLine(ex.StackTrace);
Console.WriteLine($"Failed to handle order accepted event : ${ex}");
}
}
}
}
});
}
public bool HandleOrderAcceptedEvent(OrderAcceptedEvent evt)
{
Console.WriteLine("Handling order accepted event.");
var result = this.orderRepository.Add(new Order
{
OrderId = evt.OrderId,
CreatedOn = (long)evt.CreatedOn,
TaxRate = (int)evt.TaxRate,
UserId = evt.UserId,
LineItems = (from itm in evt.LineItems
select new Entities.LineItem
{
SKU = itm.SKU,
OrderId = evt.OrderId,
Quantity = (int)itm.Quantity,
UnitPrice = (int)itm.UnitPrice
}).ToArray()
});
return(result != null);
}
public bool HandleOrderAcceptedEvent(OrderAcceptedEvent evt)
{
Console.WriteLine("Handling order accepted event.");
Order result = orderRepository.Add(new Order
{
OrderID = evt.OrderID,
CreatedOn = (long)evt.CreatedOn,
TaxRate = (int)evt.TaxRate,
UserID = evt.UserID,
LineItems = (from itm in evt.LineItems
select new PartialFoods.Services.OrderManagementServer.Entities.LineItem
{
SKU = itm.SKU,
OrderID = evt.OrderID,
Quantity = (int)itm.Quantity,
UnitPrice = (int)itm.UnitPrice
}).ToArray()
});
return(result != null);
}
