*
* @param store Logical data store from which read should occur.
* @param path Path which uniquely identifies subtree which client want to read
- * @return a FluentFuture containing the result of the read. The Future blocks until the commit operation is
- * complete. Once complete:
+ * @return a FluentFuture containing the result of the read. The Future blocks until the operation is complete. Once
+ * complete:
* <ul>
* <li>If the data at the supplied path exists, the Future returns an Optional object containing the data.
* </li>
* an exception derived from ReadFailedException.</li>
* </ul>
* @throws NullPointerException if any of the arguments is null
+ * @throws IllegalArgumentException if the path is {@link InstanceIdentifier#isWildcarded()}
*/
<T extends DataObject> @NonNull FluentFuture<Optional<T>> read(@NonNull LogicalDatastoreType store,
@NonNull InstanceIdentifier<T> path);
+
+ /**
+ * Determines if data data exists in the provided logical data store located at the provided path.
+ *
+ * <p>
+ * Default implementation just delegates to {@link #read(LogicalDatastoreType, InstanceIdentifier)}. Implementations
+ * are recommended to override with a more efficient implementation.
+ *
+ * @param store Logical data store from which read should occur.
+ * @param path Path which uniquely identifies subtree which client want to read
+ * @return a FluentFuture containing the result of the check. The Future blocks until the operation is complete.
+ * Once complete:
+ * <ul>
+ * <li>If the data at the supplied path exists, the Future returns {@link Boolean#TRUE}.
+ * </li>
+ * <li>If the data at the supplied path does not exist, the Future returns {@link Boolean#FALSE}.</li>
+ * <li>If the check fails, the Future will fail with a {@link ReadFailedException} or an exception derived
+ * from ReadFailedException.</li>
+ * </ul>
+ * @throws NullPointerException if any of the arguments is null
+ * @throws IllegalArgumentException if the path is {@link InstanceIdentifier#isWildcarded()} and the implementation
+ * does not support evaluating wildcards.
+ */
+ @NonNull FluentFuture<Boolean> exists(@NonNull LogicalDatastoreType store, @NonNull InstanceIdentifier<?> path);
}