public void Unsubscribe(string topicName, string subscriberReference)
{
SystemWideLogging.LogServiceClient.LogEvent("MessageBus :: VideoMessageBus\\SubscriptionService.cs :: public void Unsubscribe(string topicName, string subscriberReference)", "Unsubscription Request for " + topicName + " received");
ConsoleHelper.WriteLine(ConsoleColor.Yellow, "Unsubscription for " + topicName + " received");
SubscriptionRegistry.RemoveSubscriber(topicName, subscriberReference);
}
public void Publish(VideoMessage message)
{
if (message is DeliveryRequestMessage)
{
SystemWideLogging.LogServiceClient.LogEvent("MessageBus :: VideoMessageBus\\PublisherService.cs :: public void Publish(VideoMessage message)", "Received DeliveryRequestMessage Publish Request from VideoStore ( message.TopicName=" + message.TopicName + " )");
var deliveryMessage = message as DeliveryRequestMessage;
// Find the scubscriber who matches with region of delivery address
string keyword = deliveryMessage.TopicName + "/" + deliveryMessage.RegionName;
IEnumerable <string> subscribers = SubscriptionRegistry.GetSubscribers(keyword);
if (subscribers == null ||
((IList <string>)subscribers).Count == 0)
{
// Save the message
SystemWideLogging.LogServiceClient.LogEvent("MessageBus :: VideoMessageBus\\PublisherService.cs :: public void Publish(VideoMessage message)", "Can't find any subscribers, storing message in queue ( message.TopicName=" + message.TopicName + " )");
PutMessageIntoQueue(message);
return;
}
foreach (string subscriberAddress in subscribers)
{
var service = ServiceFactory.GetService <ISubscriberService>(subscriberAddress);
if (service == null)
{
SystemWideLogging.LogServiceClient.LogEvent("MessageBus :: VideoMessageBus\\PublisherService.cs :: public void Publish(VideoMessage message)", "Following service was unsubscribed because no such address is available: " + subscriberAddress);
PutMessageIntoQueue(message);
// It must be a dead service so unsubscribe it
SubscriptionRegistry.RemoveSubscriber(message.TopicName, subscriberAddress);
ConsoleHelper.WriteLine(ConsoleColor.Yellow,
"Following service was unsubscribed because no such address is available: " +
subscriberAddress);
return;
}
try
{
SystemWideLogging.LogServiceClient.LogEvent("MessageBus :: VideoMessageBus\\PublisherService.cs :: public void Publish(VideoMessage message)", "Forwarding message to subscriber ( subscriberAddress=" + subscriberAddress + " , message.TopicName=" + message.TopicName + " )");
service.PublishToSubscriber(message);
Console.WriteLine("Request sent to " + subscriberAddress);
}
catch
{
// It must be a dead service so unsubscribe it
SubscriptionRegistry.RemoveSubscriber(message.TopicName, subscriberAddress);
ConsoleHelper.WriteLine(ConsoleColor.Red,
"An failue has occurred to publish the message to " + subscriberAddress +
" so the service was unsubscribed!");
}
}
}
}
