lhotari commented on code in PR #24938:
URL: https://github.com/apache/pulsar/pull/24938#discussion_r2487071447
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managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedCursorImpl.java:
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@@ -1453,6 +1453,23 @@ public Position getFirstPosition() {
return firstLedgerId == null ? null :
PositionFactory.create(firstLedgerId, 0);
}
+ /**
+ * Compare two positions. It is different with {@link
Position#compareTo(Position)} when the params are invalid.
+ * For example: position-1 is "1:{latest entry}", and position-2 is "2:0",
they are the same position.
+ */
+ private int comparePositions(Position pos1, Position pos2) {
+ if (pos1 == null || pos2 == null) {
+ throw new IllegalArgumentException("Positions must not be null");
+ }
+ if (pos1.getLedgerId() == pos2.getLedgerId() && pos1.getEntryId() ==
pos2.getEntryId()) {
+ return 0;
+ }
+ if (!ledger.isValidPosition(pos1) || !ledger.isValidPosition(pos2)) {
+ return
ledger.getNextValidPosition(pos1).compareTo(ledger.getNextValidPosition(pos2));
+ }
Review Comment:
Why is getNextValidPosition call made for both positions? Could this be
handled in way so that getNextValidPosition is called for pos1 and pos2
separately only if it's not valid? The result would be slightly different, for
example in cases where pos2 is already a valid position and pos1 becomes the
same as pos2 only by calling getNextValidPosition.
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