public override async Task <Message> HandleMessage(Message sourceMessage)
{
// Validate supported language
// For simplicity, message key corresponds to selected language
var validationPassed = false;
var message = (Message <int, string>)sourceMessage;
if (languageStore.ContainsKey(message.Key))
{
validationPassed = true;
}
else
{
var errorMessage = $"No language corresponds to message key '{message.Key}'";
validationErrorProducer.ProduceEvent(
new Confluent.Kafka.Message <int, string>
{
Key = message.Key,
Value = errorMessage
});
logger.LogInformation($"Validation handler: {errorMessage}");
return(null);
}
// Call next handler
var sinkMessage = new Message <int, string>(message.Key, message.Value);
if (validationPassed)
{
logger.LogInformation($"Validation handler: Passed { sinkMessage.Key } { sinkMessage.Value }");
}
return(await base.HandleMessage(sinkMessage));
}
public override async Task <Message> HandleMessage(Message sourceMessage)
{
// Transform message
var message = ((MockMessage <string>)sourceMessage).Value.ToLower();
// Notify subscribers
messageHandledProducer.ProduceEvent(message);
// Call next handler
var sinkMessage = new MockMessage <string>(message);
return(await base.HandleMessage(sinkMessage));
}
public override async Task <Message> HandleMessage(Message sourceMessage)
{
// Get count
var count = ((MockMessage <string>)sourceMessage).Value.Length;
// Notify subscribers
messageHandledProducer.ProduceEvent(count);
// Call next handler
var sinkMessage = new MockMessage <int>(count);
return(await base.HandleMessage(sinkMessage));
}
public override async Task <Message> HandleMessage(Message sourceMessage)
{
// Transform message
var message = (Message <int, string>)sourceMessage;
var chars = message.Value.ToCharArray();
Array.Reverse(chars);
message.Value = new string(chars);
// Notify subscribers
messageHandledProducer.ProduceEvent(message.Value);
// Call next handler
var sinkMessage = new Message <int, string>(message.Key, message.Value);
return(await base.HandleMessage(sinkMessage));
}