private void EnsureTopicExists(string topic)
{
if (_topicCreated || _makeChannel.Equals(OnMissingChannel.Assume))
{
return;
}
try
{
if (_managementClientWrapper.TopicExists(topic))
{
_topicCreated = true;
return;
}
if (_makeChannel.Equals(OnMissingChannel.Validate))
{
throw new ChannelFailureException($"Topic {topic} does not exist and missing channel mode set to Validate.");
}
_managementClientWrapper.CreateTopic(topic);
_topicCreated = true;
}
catch (Exception e)
{
//The connection to Azure Service bus may have failed so we re-establish the connection.
_managementClientWrapper.Reset();
s_logger.LogError(e, "Failing to check or create topic.");
throw;
}
}
private void EnsureSubscription()
{
const int maxDeliveryCount = 2000;
if (_subscriptionCreated || _makeChannel.Equals(OnMissingChannel.Assume))
{
return;
}
try
{
if (_managementClientWrapper.SubscriptionExists(_topicName, _subscriptionName))
{
_subscriptionCreated = true;
return;
}
if (_makeChannel.Equals(OnMissingChannel.Validate))
{
throw new ChannelFailureException($"Subscription {_subscriptionName} does not exist on topic {_topicName} and missing channel mode set to Validate.");
}
_managementClientWrapper.CreateSubscription(_topicName, _subscriptionName, maxDeliveryCount);
_subscriptionCreated = true;
}
catch (MessagingEntityAlreadyExistsException)
{
s_logger.LogWarning("Message entity already exists with topic {Topic} and subscription {ChannelName}.", _topicName,
_subscriptionName);
_subscriptionCreated = true;
}
catch (Exception e)
{
s_logger.LogError(e, "Failing to check or create subscription.");
//The connection to Azure Service bus may have failed so we re-establish the connection.
_managementClientWrapper.Reset();
throw new ChannelFailureException("Failing to check or create subscription", e);
}
}