Allow or Disallow a Subscription

subuta

Hello,

When a user requests a subscription to in item, I want LightStreamer to ask me whether the user is allowed to subscribe to that item. I see how I can implement a method in the metadata provider to check the user's user name and password, but how can I instruct LightStreamer with regard to subscriptions to individual items?

Thank you.

-Dan

Mone

Hi,

You can do that by throwing a CreditsException from the notifyNewTablemethod of the MetadataProvider. Note that you need to return true from the wantsTablesNotifications for the notifyNewTable method to be called

Another way would be to make the check in the getItems method and hijack not-permitted item names to different dummy items; in this case you don't have the user name to do the check but the session id so you should leverage the notifyNewSession and notifySessionClose to keep an index of your user-sessions.

subuta

Thanks, Mone. I guess notifyNewTable method gets called for each new subscription. Is that right?

Mone

Yes exactly; keep in mind that a single subscription may contain several items, anyway you have all the needed information in the notifyNewTable to take your decisions.