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Bulk Delete Listener

Listeners for bulk deletion work identically to the ones for single deletion. The difference is in the method names to add and remove listener objects:

Conditional bulk delete listener

A conditional bulk delete listener receives an event when an API client uses the bulkDelete API to delete multiple objects in a table with the same whereClause statement as specified by the RT client:

EventHandler<Map> eventHandler = Backendless.Data.of( "TABLE-NAME" ).rt();
eventHandler.addBulkDeleteListener( String whereClause, AsyncCallback<BulkEvent> callback );

EventHandler<T> eventHandler = Backendless.Data.of( T.class ).rt();
eventHandler.addBulkDeleteListener( String whereClause, AsyncCallback<BulkEvent> callback );

Unconditional bulk delete listener

A unconditional bulk delete listener receives events when a client uses the bulkDelete API with any whereClause statement:

EventHandler<Map> eventHandler = Backendless.Data.of( "TABLE-NAME" ).rt();
eventHandler.addBulkDeleteListener( AsyncCallback<BulkEvent> callback );

EventHandler<T> eventHandler = Backendless.Data.of( T.class ).rt();
eventHandler.addBulkDeleteListener( AsyncCallback<BulkEvent> callback );

Both conditional and unconditional event listeners receive the following information in the callback object. The properties listed below are included  into the BulkEvent object delivered to the listener's callback.

  • whereClause - the where clause value used in the API call to identify the objects deleted from the database.
  • count - the number of objects deleted from the database.

Removing listeners

The method removes all registered listeners for the bulkDelete event:

eventHandler.removeBulkDeleteListeners();

The method below removes all listeners which process events for a specific where clause. The value of the whereClause argument must be the same as one in the addBulkDeleteListener method:

eventHandler.removeBulkDeleteListeners( String whereClause );

Removing a specific listener

This method removes a listener identified by the callback object:

// for the class-based approach:
eventHandler.removeBulkDeleteListener( AsyncCallback<T> listenerObject );

// for the map-based approach:
eventHandler.removeBulkDeleteListener( AsyncCallback<Map> listenerObject );