- resolveAnyChangeEvent(candidate.getRootPath(), Collections.singleton(w.getRootNode()), candidate.getRootNode());
- return createNotificationTasks();
- }
- }
-
- /**
- *
- * Walks map of listeners to data change events, creates notification
- * delivery tasks.
- *
- * Walks map of registered and affected listeners and creates notification
- * tasks from set of listeners and events to be delivered.
- *
- * If set of listeners has more then one event (applicable to wildcarded
- * listeners), merges all data change events into one, final which contains
- * all separate updates.
- *
- * Dispatch between merge variant and reuse variant of notification task is
- * done in
- * {@link #addNotificationTask(com.google.common.collect.ImmutableList.Builder, Node, java.util.Collection)}
- *
- * @return Collection of notification tasks.
- */
- private Collection<ChangeListenerNotifyTask> createNotificationTasks() {
- ImmutableList.Builder<ChangeListenerNotifyTask> taskListBuilder = ImmutableList.builder();
- for (Entry<ListenerTree.Node, Collection<DOMImmutableDataChangeEvent>> entry : events.asMap().entrySet()) {
- addNotificationTask(taskListBuilder, entry.getKey(), entry.getValue());
- }
- return taskListBuilder.build();
- }
-
- /**
- * Adds notification task to task list.
- *
- * If entry collection contains one event, this event is reused and added to
- * notification tasks for listeners (see
- * {@link #addNotificationTaskByScope(com.google.common.collect.ImmutableList.Builder, Node, DOMImmutableDataChangeEvent)}
- * . Otherwise events are merged by scope and distributed between listeners
- * to particular scope. See
- * {@link #addNotificationTasksAndMergeEvents(com.google.common.collect.ImmutableList.Builder, Node, java.util.Collection)}
- * .
- *
- * @param taskListBuilder
- * @param listeners
- * @param entries
- */
- private static void addNotificationTask(final ImmutableList.Builder<ChangeListenerNotifyTask> taskListBuilder,
- final ListenerTree.Node listeners, final Collection<DOMImmutableDataChangeEvent> entries) {
-
- if (!entries.isEmpty()) {
- if (entries.size() == 1) {
- addNotificationTaskByScope(taskListBuilder, listeners, Iterables.getOnlyElement(entries));
- } else {
- addNotificationTasksAndMergeEvents(taskListBuilder, listeners, entries);
- }
- }
- }
-
- /**
- *
- * Add notification deliveries task to the listener.
- *
- *
- * @param taskListBuilder
- * @param listeners
- * @param event
- */
- private static void addNotificationTaskByScope(
- final ImmutableList.Builder<ChangeListenerNotifyTask> taskListBuilder, final ListenerTree.Node listeners,
- final DOMImmutableDataChangeEvent event) {
- DataChangeScope eventScope = event.getScope();
- for (DataChangeListenerRegistration<?> listenerReg : listeners.getListeners()) {
- DataChangeScope listenerScope = listenerReg.getScope();
- List<DataChangeListenerRegistration<?>> listenerSet = Collections
- .<DataChangeListenerRegistration<?>> singletonList(listenerReg);
- if (eventScope == DataChangeScope.BASE) {
- taskListBuilder.add(new ChangeListenerNotifyTask(listenerSet, event));
- } else if (eventScope == DataChangeScope.ONE && listenerScope != DataChangeScope.BASE) {
- taskListBuilder.add(new ChangeListenerNotifyTask(listenerSet, event));
- } else if (eventScope == DataChangeScope.SUBTREE && listenerScope == DataChangeScope.SUBTREE) {
- taskListBuilder.add(new ChangeListenerNotifyTask(listenerSet, event));
- }
- }
- }
-
- /**
- *
- * Add notification tasks with merged event
- *
- * Separate Events by scope and creates merged notification tasks for each
- * and every scope which is present.
- *
- * Adds merged events to task list based on scope requested by client.
- *
- * @param taskListBuilder
- * @param listeners
- * @param entries
- */
- private static void addNotificationTasksAndMergeEvents(
- final ImmutableList.Builder<ChangeListenerNotifyTask> taskListBuilder, final ListenerTree.Node listeners,
- final Collection<DOMImmutableDataChangeEvent> entries) {
-
- final Builder baseBuilder = builder(DataChangeScope.BASE);
- final Builder oneBuilder = builder(DataChangeScope.ONE);
- final Builder subtreeBuilder = builder(DataChangeScope.SUBTREE);
-
- boolean baseModified = false;
- boolean oneModified = false;
- boolean subtreeModified = false;
- for (final DOMImmutableDataChangeEvent entry : entries) {
- switch (entry.getScope()) {
- // Absence of breaks is intentional here. Subtree contains base and
- // one, one also contains base
- case BASE:
- baseBuilder.merge(entry);
- baseModified = true;
- case ONE:
- oneBuilder.merge(entry);
- oneModified = true;
- case SUBTREE:
- subtreeBuilder.merge(entry);
- subtreeModified = true;
- }
- }
-
- if (baseModified) {
- addNotificationTaskExclusively(taskListBuilder, listeners, baseBuilder.build());
- }
- if (oneModified) {
- addNotificationTaskExclusively(taskListBuilder, listeners, oneBuilder.build());
- }
- if (subtreeModified) {
- addNotificationTaskExclusively(taskListBuilder, listeners, subtreeBuilder.build());
- }
- }
-
- private static void addNotificationTaskExclusively(
- final ImmutableList.Builder<ChangeListenerNotifyTask> taskListBuilder, final Node listeners,
- final DOMImmutableDataChangeEvent event) {
- for (DataChangeListenerRegistration<?> listener : listeners.getListeners()) {
- if (listener.getScope() == event.getScope()) {
- Set<DataChangeListenerRegistration<?>> listenerSet = Collections
- .<DataChangeListenerRegistration<?>> singleton(listener);
- taskListBuilder.add(new ChangeListenerNotifyTask(listenerSet, event));
+ // Defensive: reset internal state
+ collectedEvents = ArrayListMultimap.create();
+
+ // Run through the tree
+ final ResolveDataChangeState s = ResolveDataChangeState.initial(candidate.getRootPath(), w.getRootNode());
+ resolveAnyChangeEvent(s, candidate.getRootNode());
+
+ /*
+ * Convert to tasks, but be mindful of multiple values -- those indicate multiple
+ * wildcard matches, which need to be merged.
+ */
+ for (Entry<DataChangeListenerRegistration<?>, Collection<DOMImmutableDataChangeEvent>> e : collectedEvents.asMap().entrySet()) {
+ final Collection<DOMImmutableDataChangeEvent> col = e.getValue();
+ final DOMImmutableDataChangeEvent event;
+
+ if (col.size() != 1) {
+ final Builder b = DOMImmutableDataChangeEvent.builder(DataChangeScope.BASE);
+ for (DOMImmutableDataChangeEvent i : col) {
+ b.merge(i);
+ }
+
+ event = b.build();
+ LOG.trace("Merged events {} into event {}", col, event);
+ } else {
+ event = col.iterator().next();
+ }
+
+ manager.submitNotification(e.getKey(), event);