mino181295 opened a new pull request #1538:
URL: https://github.com/apache/zookeeper/pull/1538
```
public synchronized void processSync(LearnerSyncRequest r) {
if (outstandingProposals.isEmpty()) {
sendSync(r);
} else {
List<LearnerSyncRequest> l = pendingSyncs.get(lastProposed);
if (l == null) {
l = new ArrayList<LearnerSyncRequest>();
}
l.add(r);
pendingSyncs.put(lastProposed, l);
}
}
```
we can use the computeIfAbsent to make the code more clean and elegant
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