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https://issues.apache.org/jira/browse/ZOOKEEPER-4000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17231083#comment-17231083
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maoling commented on ZOOKEEPER-4000:
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Haha, the Jira number has entered the new 4XXX era :)
> 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
> Priority: Minor
> 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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