public void OpenSubscription(long id, SubscriptionConnectionOptions options)
{
if (openSubscriptions.TryAdd(id, options))
{
UpdateClientActivityDate(id);
return;
}
SubscriptionConnectionOptions existingOptions;
if(openSubscriptions.TryGetValue(id, out existingOptions) == false)
throw new SubscriptionDoesNotExistException("Didn't get existing open subscription while it's expected. Subscription id: " + id);
if (existingOptions.ConnectionId.Equals(options.ConnectionId, StringComparison.OrdinalIgnoreCase))
{
// reopen subscription on already existing connection - might happen after network connection problems the client tries to reopen
UpdateClientActivityDate(id);
return;
}
var config = GetSubscriptionConfig(id);
if (SystemTime.UtcNow - config.TimeOfLastClientActivity > TimeSpan.FromTicks(existingOptions.ClientAliveNotificationInterval.Ticks * 3))
{
// last connected client didn't send at least two 'client-alive' notifications - let the requesting client to open it
ReleaseSubscription(id);
openSubscriptions.TryAdd(id, options);
return;
}
throw new SubscriptionInUseException("Subscription is already in use. There can be only a single open subscription connection per subscription.");
}
public void OpenSubscription(long id, SubscriptionConnectionOptions options)
{
SizeLimitedConcurrentSet<string> releasedConnections;
if (forciblyReleasedSubscriptions.TryGetValue(id, out releasedConnections) && releasedConnections.Contains(options.ConnectionId))
throw new SubscriptionClosedException("Subscription " + id + " was forcibly released. Cannot reopen it.");
if (openSubscriptions.TryAdd(id, options))
{
UpdateClientActivityDate(id);
return;
}
SubscriptionConnectionOptions existingOptions;
if(openSubscriptions.TryGetValue(id, out existingOptions) == false)
throw new SubscriptionDoesNotExistException("Didn't get existing open subscription while it's expected. Subscription id: " + id);
if (existingOptions.ConnectionId.Equals(options.ConnectionId, StringComparison.OrdinalIgnoreCase))
{
// reopen subscription on already existing connection - might happen after network connection problems the client tries to reopen
UpdateClientActivityDate(id);
return;
}
var config = GetSubscriptionConfig(id);
var now = SystemTime.UtcNow;
var timeSinceBatchSent = now - config.TimeOfSendingLastBatch;
if (timeSinceBatchSent > existingOptions.BatchOptions.AcknowledgmentTimeout &&
SystemTime.UtcNow - config.TimeOfLastClientActivity > TimeSpan.FromTicks(existingOptions.ClientAliveNotificationInterval.Ticks * 3))
{
// last connected client exceeded ACK timeout and didn't send at least two 'client-alive' notifications - let the requesting client to open it
ForceReleaseAndOpenForNewClient(id, options);
return;
}
switch (options.Strategy)
{
case SubscriptionOpeningStrategy.TakeOver:
if (existingOptions.Strategy != SubscriptionOpeningStrategy.ForceAndKeep)
{
ForceReleaseAndOpenForNewClient(id, options);
return;
}
break;
case SubscriptionOpeningStrategy.ForceAndKeep:
ForceReleaseAndOpenForNewClient(id, options);
return;
}
throw new SubscriptionInUseException("Subscription is already in use. There can be only a single open subscription connection per subscription.");
}
private void ForceReleaseAndOpenForNewClient(long id, SubscriptionConnectionOptions options)
{
ReleaseSubscription(id);
openSubscriptions.TryAdd(id, options);
UpdateClientActivityDate(id);
}
