ManagementClient - Check if a rule exists on subscription

Description

In service bus SDK, it would be nice to have a method, that would check if a named rule exists on the a service bus topic. There are rules which include GetRuleAsync, UpdateRuleAsync and UpdateRuleAsync.

Actual Behavior

1. To programmatically create/update/delete a subscription rule the relevant SDK methods are to be used. However, if the rule does not exist, the SDK raises MessagingEntityNotFoundException.

To check if a rule exists, a check as below needs to be done by an developer.

private static async Task<bool> RuleExistsAsync(
            ManagementClient managementClient, 
            string topicPath, 
            string subscriptionName, 
            string ruleName)
        {
            // There is no method in the SDK to check if a particular rule exists.
            try
            {
                if (await managementClient.GetRuleAsync
                    (topicPath, subscriptionName, ruleName) != null)
                {
                    return false;
                }
            }
            catch (MessagingEntityNotFoundException){}

            return true;
        }

Proposed Behavior

1. Expose a method in the ManagementClient named RuleExistsAsync, similar to TopicExistsAsync or SubscriptionExistsAsync.

[SeanFeldman]

ManagementClient while exposing server-side options belongs to the client side SDK. You might want to move this issue to the SDK repo, replacing this one with an issue to provide a way on the broker to achieve this functionality.

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