Specifying the notification communication method
You can specify that the NexJ application server use streaming or push notifications to receive updates from user folders on Exchange Server.
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Exchange Server 2013 and Exchange Server 2016 support either streaming or push notifications. Exchange Online only supports streaming notifications.
Streaming notifications
The NexJ application server subscribes to a folder on Exchange Server and opens a streaming connection. Notifications are received by the NexJ application server as a response on that connection. You must enable the Autodiscover service to use streaming notifications.
Push notifications
The NexJ application server subscribes to a folder on Exchange Server and provides a callback URL, for example https://<host>/nexj/anon/channel/ExchangeEWSNotificationReceiver, for Exchange Server. When user folders are updated, Exchange Server posts a notification to the NexJ application server.
Specifying notification communication methods
You can enable streaming or push notifications for Exchange Server 2013 and Exchange Server 2016 in NexJ Admin Console.
Before enabling the streaming communication method, you must specify the URL for the Exchange Server target in the ExternalEwsUrl property on Exchange Server 2013 or Exchange Server 2016.
To specify the notification communication method for an Exchange server:
You have enabled streaming or push notifications for the selected Exchange server. If you enabled streaming notifications, note that subscriptions to user folders do not occur immediately. User folders become subscribed as follows:
- The Autodiscover service runs and obtains grouping information for links to user folders.
- Links to user folders subscribe on a periodic timer.
- Subscribed links are placed on a queue and wait to be streamed.
- Messages on the queue are processed and a streaming connection is opened for all links in that message.
You can view the subscription status of individual users folders in the Subscription State field in the Links list at the bottom of the Synchronization page.
Viewing the subscription status of user folders
You can view information about links to user folders for a target server in the Links list at the bottom of the Synchronization page. Statuses vary depending on whether push or streaming notification communication method is used.
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The subscription status for a folder does not update immediately after a server restart.
To view the subscription status of a user folder:
You have viewed the subscription status of a user folder.