Name 

Description 

 

ClearSnapshot 

Called by a Data Adapter to signal to Lightstreamer Kernel that the current Snapshot of the Item has suddenly become empty. More precisely:
- for subscriptions in MERGE mode, the current state of the Item will be cleared, as though an update with all fields valued as null were issued;
- for subscriptions in COMMAND mode, the current state of the Item will be cleared, as though a DELETE event for each key were issued;
- for subscriptions in DISTINCT mode, a suitable notification that the Snapshot for the Item should be cleared will be sent to all the clients... more 

 

EndOfSnapshot 

Called by a Data Adapter to signal to Lightstreamer Kernel that no more Item Event belonging to the Snapshot are expected for an Item. This call is optional, because the Snapshot completion can also be inferred from the isSnapshot flag in the update calls. However, this call allows Lightstreamer Kernel to be informed of the Snapshot completion before the arrival of the first non-snapshot event. Calling this function is recommended if the Item is to be subscribed in DISTINCT mode. In case the Data Adapter returned false to IsSnapshotAvailable for the same Item, this function should not be called.
The... more 

 

Failure 

Called by a Data Adapter to notify Lightstreamer Kernel of the occurrence of a severe problem that can compromise future operation of the Data Adapter.  

 

Update 

This is the overview for the Update method overload.