//use QueueUtil to create the queues that we'll use
public static void CreateAllQueues()
{
QueueUtils.CreateQueue(inQpath, true);
QueueUtils.CreateQueue(primaryServicePath, true);
QueueUtils.CreateQueue(backupServicePath, true);
QueueUtils.CreateQueue(primaryLoggingPath, true);
QueueUtils.CreateQueue(backupLoggingPath, true);
}
//after each exercise, clear out all the queues for the next example
private static void EmptyQueues()
{
QueueUtils.PurgeQueue(inQpath);
QueueUtils.PurgeQueue(primaryServicePath);
QueueUtils.PurgeQueue(backupServicePath);
QueueUtils.PurgeQueue(primaryLoggingPath);
QueueUtils.PurgeQueue(backupLoggingPath);
QueueUtils.PurgeQueue("FormatName:Direct=OS:.\\System$;DEADXACT");
}
private static void RunMulticastErrorHandlingCase4()
{
EmptyQueues();
System.Console.Write("In the final example, we also delete the backup logging queue. Now the Routing Service will be unable to transactionally deliver the ");
System.Console.Write("message to both a service queue and a backup queue, so it shouldn't move the message at all. At the end of this, we should see that ");
System.Console.Write("because the Routing Service was unable to transactionally deliver the message to both a service queue and a logging queue, MSMQ marks ");
System.Console.WriteLine("the message undeliverable. Based on our MSMQ settings, this should place it in the system Transactional DLQ. ");
System.Console.WriteLine("Deleting the backup logging queue");
QueueUtils.DeleteQueue(backupLoggingPath);
QueueUtils.InsertMessageIntoQueue("net.msmq://localhost/private/inQ");
System.Console.WriteLine("Press <Enter> to begin routing messages");
System.Console.ReadLine();
PrintQueueStatus();
}
private static void RunMulticastErrorHandlingCase1()
{
EmptyQueues();
QueueUtils.InsertMessageIntoQueue("net.msmq://localhost/private/inQ");
System.Console.Write("In this case, we should see one message show up in the primary service queue and one message show up in the primary logging queue.");
System.Console.Write(" This is because the Routing Service is receiving one message from the inbound queue and multicasting it to the two endpoint");
System.Console.Write(" lists we configured before. Since the primary endpoints are responding, both of them accept the message and the Routing Service ");
System.Console.Write("is able to complete the transaction, successfully moving the message from the inbound queue to the primary service queue and the ");
System.Console.WriteLine("primary logging queue.");
System.Console.WriteLine("Press <Enter> to begin routing messages");
System.Console.ReadLine();
PrintQueueStatus();
System.Console.WriteLine("Press <Enter> to continue");
System.Console.ReadLine();
}
private static void RunMulticastErrorHandlingCase3()
{
EmptyQueues();
System.Console.Write("In this example, we also delete the primary logging queue, forcing the Routing Service to send the message to both the backup ");
System.Console.Write("service queue and the backup logging queue. Since both primary queues are unavailable, but the backup queues are present, we should ");
System.Console.Write("see that the Routing Service is able to complete the transaction, successfully moving the message from the inbound queue to both the ");
System.Console.WriteLine("backup service queue and the backup logging queue.");
System.Console.WriteLine("Deleting the primary logging queue");
QueueUtils.DeleteQueue(primaryLoggingPath);
QueueUtils.InsertMessageIntoQueue("net.msmq://localhost/private/inQ");
System.Console.WriteLine("Press <Enter> to begin routing messages");
System.Console.ReadLine();
PrintQueueStatus();
System.Console.WriteLine("Press <Enter> to continue");
System.Console.ReadLine();
}
private static void RunMulticastErrorHandlingCase2()
{
EmptyQueues();
System.Console.Write("In this example, we are going to delete the primary service queue, simulating a situation in which the system is unavailable ");
System.Console.Write("for some reason. In this case, we should see one message show up in the backup service queue, and one message show up in the ");
System.Console.Write("primary logging queue. This is beacuse the Routing Service is failing to contact the primary service queue (it doesn't exist), ");
System.Console.Write("and so automatically fails that transaction and creates another to wrap the sends that occur to the backup service queue and the ");
System.Console.Write("primary logging queue. Since the backup service queue and the primary logging queue both respond, the Routing Service is able ");
System.Console.Write("to complete the transaction, successfully moving the message from the inbound queue to the backup service queue and the primary ");
System.Console.WriteLine("logging queue");
System.Console.WriteLine("Deleting the primary service queue");
QueueUtils.DeleteQueue(primaryServicePath);
QueueUtils.InsertMessageIntoQueue("net.msmq://localhost/private/inQ");
System.Console.WriteLine("Press <Enter> to begin routing messages");
System.Console.ReadLine();
PrintQueueStatus();
System.Console.WriteLine("Press <Enter> to continue");
System.Console.ReadLine();
}
//go to each queue and print out the number of messages it contains
private static void PrintQueueStatus()
{
System.Threading.Thread.Sleep(5000);
System.Console.WriteLine("The inbound queue has {0} messages.", QueueUtils.GetMessageCount(inQpath));
if (QueueUtils.QueueExists(primaryServicePath))
{
Console.WriteLine("The primary service queue has {0} messages.", QueueUtils.GetMessageCount(primaryServicePath));
}
else
{
Console.WriteLine("The primary service queue does not exist.");
}
if (QueueUtils.QueueExists(backupServicePath))
{
Console.WriteLine("The backup service queue has {0} messages.", QueueUtils.GetMessageCount(backupServicePath));
}
else
{
Console.WriteLine("The backup service queue does not exist.");
}
if (QueueUtils.QueueExists(primaryLoggingPath))
{
Console.WriteLine("The primary logging queue has {0} messages.", QueueUtils.GetMessageCount(primaryLoggingPath));
}
else
{
Console.WriteLine("The primary logging queue does not exist.");
}
if (QueueUtils.QueueExists(backupLoggingPath))
{
Console.WriteLine("The backup logging queue has {0} messages.", QueueUtils.GetMessageCount(backupLoggingPath));
}
else
{
Console.WriteLine("The backup logging queue does not exist.");
}
}
//main method to run the four test cases
static void Main(string[] args)
{
CreateAllQueues();
using (ServiceHost host = new ServiceHost(typeof(RoutingService)))
{
//uncomment this call and rename the provided App.config to something
//else like App.config.example to run a Router configured via code
//ConfigureRouterViaCode(host);
host.Open();
System.Console.WriteLine("Routing Service Configured and Opened");
System.Console.WriteLine("Press Enter to Run Case 1");
System.Console.ReadLine();
RunMulticastErrorHandlingCase1();
}
using (ServiceHost host = new ServiceHost(typeof(RoutingService)))
{
//uncomment this call and rename the provided App.config to something
//else like App.config.example to run a Router configured via code
//ConfigureRouterViaCode(host);
host.Open();
System.Console.WriteLine("Press Enter to Run Case 2");
System.Console.ReadLine();
RunMulticastErrorHandlingCase2();
}
using (ServiceHost host = new ServiceHost(typeof(RoutingService)))
{
//uncomment this call and rename the provided App.config to something
//else like App.config.example to run a Router configured via code
//ConfigureRouterViaCode(host);
host.Open();
System.Console.WriteLine("Press Enter to Run Case 3");
System.Console.ReadLine();
RunMulticastErrorHandlingCase3();
}
using (ServiceHost host = new ServiceHost(typeof(RoutingService)))
{
//uncomment this call and rename the provided App.config to something
//else like App.config.example to run a Router configured via code
//ConfigureRouterViaCode(host);
host.Open();
System.Console.WriteLine("Press Enter to Run Case 4");
System.Console.ReadLine();
RunMulticastErrorHandlingCase4();
}
System.Console.WriteLine("The System Dead Letter queue has {0} messages.", QueueUtils.GetMessageCount("FormatName:Direct=OS:.\\System$;DEADXACT"));
System.Console.WriteLine("Press <Enter> to Quit");
System.Console.ReadLine();
EmptyQueues();
QueueUtils.DeleteQueue(Environment.MachineName + "\\private$\\backupServiceQueue");
QueueUtils.DeleteQueue(Environment.MachineName + "\\private$\\inQ");
}