Notifications
Notification change token tool.
Notification is used to create or obtain change tokens, often in conjunction with cache dependencies, configuration refresh, and status observation.
Notified
A token that is always in a changed state.
GetToken(CancellationToken)
Wrap a cancelable token as a change token.
GetToken(CancellationTokenSource)
Creates a change token from the cancellation source; returns Notified when null is passed in.
Source: framework/Zongsoft.Core/src/Data/DataAccessBase.cs (excerpt; see source for context).
public IChangeToken Disposed => Notification.GetToken(_cancellation);The above is the Disposed attribute of the framework data accessor. Discussions Obtains an accessor from Module.Accessor and uses this property as a dependency when caching the accessor: releasing the accessor will trigger an invalidation, causing it to be re-created the next time it is acquired. See memory cache for the complete link.
Notification itself does not send business messages, nor does it hold reload logic; it converts a cancellation notification into an observable change signal for the cache and configuration components. The token cannot be reset after it expires, and a new cancellation source should be created when the next round of observation is required.
Notified is suitable for expressing dependencies that immediately expire, such as scenarios where cache items need to be forced to expire after they are created.
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