public static EventingBasicConsumer CreateConsumer(IModel channel, IModel resultChannel)
{
var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
if (Encoding.UTF8.GetString((Byte[])ea.BasicProperties.Headers["language"]) != null)
{
var language = (Encoding.UTF8.GetString((Byte[])ea.BasicProperties.Headers["language"])).ToLower();
var body = ea.Body;
string message = Encoding.UTF8.GetString(body);
JObject messageJObject = new JObject();
if (language.Equals(LANGUAGEJSON))
{
messageJObject = JObject.Parse(message);
Console.WriteLine("Received: {0}", messageJObject.ToString());
messageJObject.Add("bankName", JSONBANK);
}
else if (language.Equals(LANGUAGEXML))
{
try
{
XmlSerializer serializer = new XmlSerializer(typeof(LoanResponse));
MemoryStream memStream = new MemoryStream(Encoding.UTF8.GetBytes(message));
LoanResponse tempLR = (LoanResponse)serializer.Deserialize(memStream);
messageJObject = JObject.FromObject(tempLR);
Console.WriteLine("Received: {0}", messageJObject.ToString());
messageJObject.Add("bankName", XMLBANK);
}
catch (Exception e)
{
Console.WriteLine("Message was: \n");
Console.WriteLine(message + "\n");
Console.WriteLine("ERROR: \n");
Console.WriteLine(e.Message + "\n");
Console.WriteLine("Header was: " + Encoding.UTF8.GetString((Byte[])ea.BasicProperties.Headers["language"]) + "\n");
}
}
else if (language.Equals(LANGUAGESTRING))
{
string ssn = message.Split(',')[0].Split(':')[1];
string interestRate = message.Split(',')[1].Split(':')[1];
Console.WriteLine("Received: ssn: {0} : interestRate: {1}", ssn, interestRate);
messageJObject.Add("ssn", ssn);
messageJObject.Add("interestRate", interestRate);
messageJObject.Add("bankName", LAURBAERBANK);
}
else
{
Console.WriteLine("Language-Header was not null, but not correct either. \nHeader was:" + Encoding.UTF8.GetString((Byte[])ea.BasicProperties.Headers["language"]));
}
var resultBody = Encoding.UTF8.GetBytes(messageJObject.ToString());
Console.WriteLine("Header was: " + Encoding.UTF8.GetString((Byte[])ea.BasicProperties.Headers["language"]) + "\n");
resultChannel.BasicPublish(exchange: RESULTEXCHANGE, routingKey: RESULTROUTINGKEY, basicProperties: ea.BasicProperties, body: resultBody);
}
else
{
Console.WriteLine("Language-Header was null");
}
};
return(consumer);
}
public void StartReceiving()
{
LoanResponse loanResponse;
//Setup the consumer and where sets what queues it should consume from
var consumer = new EventingBasicConsumer(rabbitConn.Channel);
//We set noAck to false so consumer would not acknowledge that you have received and processed the message and remove it from the queue;
//This is done to ensure that the message has been processed before it is remove from the queue it is consumed from.
//this way, if the program has a breakdown, the message will still be on the queue and another can consume the message and process it.
rabbitConn.Channel.BasicConsume(queue: "groupB.json.bank.reply",
noAck: false,
consumer: consumer);
rabbitConn.Channel.BasicConsume(queue: "groupB.xml.bank.reply",
noAck: false,
consumer: consumer);
rabbitConn.Channel.BasicConsume(queue: "groupB.our.bank.reply",
noAck: false,
consumer: consumer);
rabbitConn.Channel.BasicConsume(queue: "groupB.web.bank.reply",
noAck: false,
consumer: consumer);
//If a message is detected then it consumes it, and process it
consumer.Received += (model, ea) =>
{
//get the header and body of the message
var body = ea.Body;
var header = ea.BasicProperties;
//we find what bank the message is from out from the queue name(in RabiitMQ default messaging is the RoutingKey equal to the queue name)
string[] values = ea.RoutingKey.Split('.');
//we know that the queue name follows this format "groupB.bankname.bank.reply" so the bank name is value 1 in the array
switch (values[1])
{
case "json":
//we have a try catch in case, that the message cannot be Deserialized, then a error message is send to the Deadletter queue
//this will prevent the program from crashing.
try
{
loanResponse = JsonConvert.DeserializeObject <LoanResponse>(Encoding.UTF8.GetString(body));
Console.WriteLine();
Console.WriteLine(" [x] Received {0}", loanResponse.ToString());
loanResponse.BankName = values[1];
rabbitConn.Send(loanResponse.ToString(), sendToQueueName, header, false);
}
catch (Exception)
{
errorMsg = "Normalizer Error: Deserializing of" + values[1] + " bank message failed, message send:" + Encoding.UTF8.GetString(body);
rabbitConn.Send(errorMsg, "groupB.deadletter", header, false);
Console.WriteLine();
Console.WriteLine("Error message send to deadletter queue: " + errorMsg);
}
break;
case "xml":
try
{
TextReader reader = new StringReader(Encoding.UTF8.GetString(body));
loanResponse = (LoanResponse)myXmlSerializer.Deserialize(reader);
Console.WriteLine();
Console.WriteLine(" [x] Received {0}", loanResponse.ToString());
loanResponse.BankName = values[1];
rabbitConn.Send(loanResponse.ToString(), sendToQueueName, header, false);
}
catch (Exception)
{
errorMsg = "Normalizer Error: Deserializing of" + values[1] + " bank message failed, message send: " + Encoding.UTF8.GetString(body);
rabbitConn.Send(errorMsg, "groupB.deadletter", header, false);
Console.WriteLine();
Console.WriteLine("Error message send to deadletter queue: " + errorMsg);
}
break;
case "web":
try
{
loanResponse = JsonConvert.DeserializeObject <LoanResponse>(Encoding.UTF8.GetString(body));
Console.WriteLine();
Console.WriteLine(" [x] Received {0}", loanResponse.ToString());
loanResponse.BankName = values[1];
rabbitConn.Send(loanResponse.ToString(), sendToQueueName, header, false);
}
catch (Exception)
{
errorMsg = "Normalizer Error: Deserializing of" + values[1] + " bank message failed, message send: " + Encoding.UTF8.GetString(body);
rabbitConn.Send(errorMsg, "groupB.deadletter", header, false);
Console.WriteLine();
Console.WriteLine("Error message send to deadletter queue: " + errorMsg);
}
break;
case "our":
try
{
string reply = Encoding.UTF8.GetString(body);
string[] replyArray = reply.Split('*');
loanResponse = new LoanResponse();
loanResponse.SSN = replyArray[1];
loanResponse.InterestRate = Double.Parse(replyArray[2]);
Console.WriteLine();
Console.WriteLine(" [x] Received {0}", loanResponse.ToString());
loanResponse.BankName = values[1];
rabbitConn.Send(loanResponse.ToString(), sendToQueueName, header, false);
}
catch (Exception)
{
errorMsg = "Normalizer Error: Deserializing of" + values[1] + " bank message failed, message send: " + Encoding.UTF8.GetString(body);
rabbitConn.Send(errorMsg, "groupB.deadletter", header, false);
Console.WriteLine();
Console.WriteLine("Error message send to deadletter queue: " + errorMsg);
}
break;
default:
errorMsg = "Normalizer Error: do not know a bank named" + values[1] + ", message send: " + ea.RoutingKey;
rabbitConn.Send(errorMsg, "groupB.deadletter", header, false);
Console.WriteLine();
Console.WriteLine("Error message send to deadletter queue: " + errorMsg);
break;
}
//Acknowledge that the message has been received and processed, then release the message from the queue, allowing us to take in the next message
rabbitConn.Channel.BasicAck(ea.DeliveryTag, false);
};
}