maoling created ZOOKEEPER-4000:
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Summary: use the computeIfAbsent to simplify the
Leader#processSync method
Key: ZOOKEEPER-4000
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4000
Project: ZooKeeper
Issue Type: Improvement
Components: server
Reporter: maoling
Fix For: 3.7.0
Look at the *Leader#processSync* method:
{code:java}
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);
}
}
{code}
we can use the *computeIfAbsent* to make the code more clean and elegant
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