BewareMyPower commented on code in PR #23958:
URL: https://github.com/apache/pulsar/pull/23958#discussion_r1950782616
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managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/cache/PendingReadsManager.java:
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@@ -211,73 +211,95 @@ private FindPendingReadOutcome
findPendingRead(PendingReadKey key, ConcurrentMap
private class PendingRead {
final PendingReadKey key;
final ConcurrentMap<PendingReadKey, PendingRead> ledgerCache;
- final List<ReadEntriesCallbackWithContext> callbacks = new
ArrayList<>(1);
- boolean completed = false;
+ final List<ReadEntriesCallbackWithContext> listeners = new
ArrayList<>(1);
+ PendingReadState state = PendingReadState.INITIALISED;
+
+ enum PendingReadState {
+ INITIALISED,
+ ATTACHED,
+ COMPLETED
+ }
Review Comment:
`INITIALISED` and `ATTACHED` are used to guarantee `attach` could only be
called once.
`COMPLETED` is used to guarantee `addListener` won't work once
`completeAndRemoveFromCache` has been called.
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