public IDisposable Subscribe(
Endpoint endpoint,
Action <BinaryMessage, AcknowledgeDelegate> callback,
string messageType,
string processingGroup,
int priority)
{
if (string.IsNullOrEmpty(processingGroup))
{
throw new ArgumentNullException(nameof(processingGroup), "should be not empty string");
}
if (m_IsDisposing)
{
throw new ObjectDisposedException(GetType().Name);
}
var subscriptionHandler = new MultipleAssignmentDisposable();
Action <int> doSubscribe = null;
doSubscribe = attemptNumber =>
{
string processingGroupName = null;
if (subscriptionHandler.IsDisposed)
{
return;
}
try
{
var group = GetProcessingGroup(processingGroup);
processingGroupName = group.Name;
_log.WriteInfo(
nameof(ProcessingGroupManager),
nameof(Subscribe),
attemptNumber > 0
? $"Resubscribing for endpoint {endpoint} within processing group '{processingGroupName}'. Attempt# {attemptNumber}"
: $"Subscribing for endpoint {endpoint} within processing group '{processingGroupName}'");
var sessionName = GetSessionName(group, priority);
var session = m_TransportManager.GetMessagingSession(endpoint, sessionName, Helper.CallOnlyOnce(() =>
{
_log.WriteInfo(
nameof(ProcessingGroupManager),
nameof(Subscribe),
$"Subscription for endpoint {endpoint} within processing group '{processingGroupName}' failure detected. Attempting subscribe again.");
doSubscribe(0);
}));
var subscription = group.Subscribe(
session,
endpoint.Destination.Subscribe,
(message, ack) => callback(message, CreateDeferredAcknowledge(ack)),
messageType,
priority);
var brokenSubscription = subscriptionHandler.Disposable;
subscriptionHandler.Disposable = subscription;
try
{
if (attemptNumber > 0)
{
brokenSubscription.Dispose();
}
}
catch
{
}
_log.WriteInfo(
nameof(ProcessingGroupManager),
nameof(Subscribe),
$"Subscribed for endpoint {endpoint} in processingGroup '{processingGroupName}' using session {sessionName}");
}
catch (InvalidSubscriptionException e)
{
_log.WriteErrorAsync(
nameof(ProcessingGroupManager),
nameof(Subscribe),
$"Failed to subscribe for endpoint {endpoint} within processing group '{processingGroupName}'",
e);
throw;
}
catch (Exception e)
{
_log.WriteErrorAsync(
nameof(ProcessingGroupManager),
nameof(Subscribe),
$"Failed to subscribe for endpoint {endpoint} within processing group '{processingGroupName}'. Attempt# {attemptNumber}. Will retry in {ResubscriptionTimeout}ms",
e);
ScheduleSubscription(doSubscribe, attemptNumber + 1);
}
};
doSubscribe(0);
return(subscriptionHandler);
}
