enixon commented on a change in pull request #870: ZOOKEEPER-3335: Prefer
ArrayList over LinkedList
URL: https://github.com/apache/zookeeper/pull/870#discussion_r269365587
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File path:
zookeeper-server/src/main/java/org/apache/zookeeper/server/ZKDatabase.java
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@@ -187,18 +190,21 @@ public ReentrantReadWriteLock getLogLock() {
}
- public synchronized List<Proposal> getCommittedLog() {
+ public synchronized Collection<Proposal> getCommittedLog() {
+ final Collection<Proposal> result;
ReadLock rl = logLock.readLock();
- // only make a copy if this thread isn't already holding a lock
- if(logLock.getReadHoldCount() <=0) {
+ // make a copy if this thread is not already holding a lock
+ if (logLock.getReadHoldCount() > 0) {
+ result = this.committedLog;
+ } else {
+ rl.lock();
try {
- rl.lock();
- return new LinkedList<Proposal>(this.committedLog);
+ result = new ArrayList<>(this.committedLog);
} finally {
rl.unlock();
}
}
- return this.committedLog;
+ return Collections.unmodifiableCollection(result);
Review comment:
For other reviewers - the changes here are the most interesting (imo).
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