lhotari commented on code in PR #24938:
URL: https://github.com/apache/pulsar/pull/24938#discussion_r2517541713
##########
managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedCursorImpl.java:
##########
@@ -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:
```suggestion
boolean isPos1Valid = ledger.isValidPosition(pos1);
boolean isPos2Valid = ledger.isValidPosition(pos2);
if (!isPos1Valid && !isPos2Valid) {
return
ledger.getNextValidPosition(pos1).compareTo(ledger.getNextValidPosition(pos2));
} else if (!isPos1Valid) {
return ledger.getNextValidPosition(pos1).compareTo(pos2);
} else if (!isPos2Valid) {
return pos1.compareTo(ledger.getNextValidPosition(pos2));
}
```
@poorbarcode this is what I mean with my previous comment.
##########
managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedCursorImpl.java:
##########
@@ -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:
> I can not fully understand the comment, could you write a demo code?
Please see https://github.com/apache/pulsar/pull/24938/files#r2517541713
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