Reamer commented on code in PR #4612:
URL: https://github.com/apache/zeppelin/pull/4612#discussion_r1221819108
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zeppelin-server/src/main/java/org/apache/zeppelin/socket/ConnectionManager.java:
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@@ -124,11 +122,33 @@ public void removeNoteConnection(String noteId) {
public void removeNoteConnection(String noteId, NotebookSocket socket) {
LOGGER.debug("Remove connection {} from note: {}", socket, noteId);
synchronized (noteSocketMap) {
- List<NotebookSocket> socketList = noteSocketMap.getOrDefault(noteId,
Collections.emptyList());
- if (!socketList.isEmpty()) {
- socketList.remove(socket);
+ Set<NotebookSocket> sockets = noteSocketMap.getOrDefault(noteId,
Collections.emptySet());
+ removeNoteConnection(noteId, sockets, socket);
+ // Remove empty socket collection from map
+ if (sockets.isEmpty()) {
+ noteSocketMap.remove(noteId);
+ }
+ }
+ }
+
+ private void removeNoteConnection(String noteId, Set<NotebookSocket> sockets,
+ NotebookSocket socket) {
+ sockets.remove(socket);
+ checkCollaborativeStatus(noteId, sockets);
+ }
+
+ public void removeConnectionFromAllNote(NotebookSocket socket) {
+ LOGGER.debug("Remove connection {} from all notes", socket);
+ synchronized (noteSocketMap) {
+ Iterator<Entry<String, Set<NotebookSocket>>> iterator =
noteSocketMap.entrySet().iterator();
+ while (iterator.hasNext()) {
+ Entry<String, Set<NotebookSocket>> noteSocketMapEntry =
iterator.next();
+ removeNoteConnection(noteSocketMapEntry.getKey(),
noteSocketMapEntry.getValue(), socket);
+ // Remove empty socket collection from map
+ if (noteSocketMapEntry.getValue().isEmpty()) {
+ iterator.remove();
Review Comment:
You get the `ConcurrentModificationException` if you modify the Map inside a
for-each loop. It is safe to delete elements in the iterator.
Checkout:
https://www.baeldung.com/java-hashmap-remove-entry#removing-an-entry-while-iterating
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