Delegate TopicDeletedCallback

In case a topic is deleted, it is a forceful deletion and deletes all messages and related meta-info form the cache. Hence, the subscriber and publisher must be notified of this deletion through TopicDeleteCallback method for notifying application about topic deletion.

Namespace:
Assembly: Alachisoft.NCache.Runtime.dll
Syntax
public delegate void TopicDeletedCallback(object sender, TopicDeleteEventArgs args);
Parameters
Type Name Description
System.Object sender

Sender's information
TopicDeleteEventArgs args

Event Arguments
Examples

The following example demonstrates how to use the TopicDeletedCallback class to notify an application about topic deletion.

First initialize cache.

Cache cache = NCache.InitializeCache("myCache");

Then get messaging service from cache.

IMessagingService messagingService=cache.MessagingService;

Then get topic from messagingService

ITopic topic=messagingService.GetTopic("mytopic");  
if(topic==null)  //Create the topic if it doesnt exist.
{
  topic=messagingService.CreateTopic("mytopic");
}

Then register for topic deletion events.

public void TopicDeletedCallback(object sender, TopicDeleteEventArgs args)
{
    // ...
}

topic.OnTopicDeleted = TopicDeletedCallback;