public void ProcessSessionSubscription(SubscriptionClient subscriptionClient, TopicClient destinationTopicClient)
{
_activityLogger.Log($"[{subscriptionClient.TopicPath}].[{subscriptionClient.Name}] - Processing subscription requiring a session");
var totalMessagesForwarded = 0;
var messageSessions = subscriptionClient.GetMessageSessions();
if (messageSessions.Any())
{
var sessionIds = new List <string>();
// obtain session IDs and then close these sessions, as they are browse-only
foreach (var messageSession in messageSessions)
{
sessionIds.Add(messageSession.SessionId);
messageSession.Close();
}
foreach (var sessionId in sessionIds)
{
_activityLogger.Log($"[{subscriptionClient.TopicPath}].[{subscriptionClient.Name}] - Processing subscription session ID: {sessionId} ");
var messagesRemaining = true;
while (messagesRemaining)
{
var messageSession = subscriptionClient.AcceptMessageSession(sessionId, _serverWaitTime);
var messages = messageSession.ReceiveBatch(_messagesToHandle, _serverWaitTime);
var messageCount = messages.Count();
if (messageCount > 0)
{
_activityLogger.Log($"Batch of {messageCount} message(s) received for processing", 1);
var messagesForwarded = 0;
foreach (var message in messages)
{
if (!_forwardedMessageIds.Contains(message.MessageId)) // ignore duplicate messages, which have already been forwarded
{
// log message
_messageLogger?.Log($"Subscription: [{subscriptionClient.TopicPath}].[{subscriptionClient.Name}]\n" +
$"{message.GetSingleLineContent()}\n");
// send messages to destination topic
destinationTopicClient.Send(message.Clone());
_forwardedMessageIds.Add(message.MessageId);
messagesForwarded++;
totalMessagesForwarded++;
}
message.Complete();
}
_activityLogger.Log($"Processing complete: {messagesForwarded} message(s) forwarded " +
$"({messageCount - messagesForwarded} duplicate(s) from other subscriptions)", 1);
}
else
{
messagesRemaining = false;
_activityLogger.Log($"No {(totalMessagesForwarded > 0 ? "more " : "")}messages to process in this session", 1);
}
messageSession.Close();
}
}
}
else
{
_activityLogger.Log("No sessions exist - no messages to forward", 1);
}
_activityLogger.Log($"[{subscriptionClient.TopicPath}].[{subscriptionClient.Name}] - Completed processing subscription - {totalMessagesForwarded} message(s) forwarded");
}