IDataSourceListener is implemented by the OSP Data Object.
The methods of IDataSourceListener notify the data consumer that an existing data member has become available, unavailable, or has been refreshed. The data consumer should release its hold on any data access interfaces for that member and call IDataSource::GetDataMember to get the new data (if available).
Following are the IDataSourceListener methods used with OSP.
| Method | Description |
| dataMemberChanged | Notifies the data consumer that an existing data member has changed. |
| dataMemberAdded | Notifies the data consumer that an existing data member has become available, unavailable, or refreshed. |
| dataMemberRemoved | Notifies the data consumer that an existing data member has been removed. |