* in the conceptual data tree for supplied path. This initial event will contain all pre-existing data as created.
*
* <p>
+ * Note: If there is no pre-existing data, the method {@link #onInitialData} will be invoked.
+ *
+ * <p>
* A data change event may be triggered spuriously, e.g. such that data before and after compare as equal.
* Implementations of this interface are expected to recover from such events. Event producers are expected to exert
* reasonable effort to suppress such events. In other words, it is completely acceptable to observe
/**
* Invoked only once during registration of the listener if there was no data in the conceptual data tree
- * for the supplied path, which was used to register this listener, and after this {@link #onDataTreeChanged}
- * would always be invoked for data changes.
+ * for the supplied path, which was used to register this listener, and after this
+ * {@link #onDataTreeChanged(Collection)} would always be invoked for data changes.
*
* <p>
- * Users not care about this event could leave it as default with no-op.
+ * Default implementation does nothing and is appropriate for users who do not care about ascertaining
+ * initial stat.
*/
default void onInitialData() {
//no-op