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https://issues.apache.org/jira/browse/LUCENE-3761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205632#comment-13205632
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Simon Willnauer commented on LUCENE-3761:
-----------------------------------------
bq. Hmm, I would prefer sticking with simple synchronized methods here...
swapSearcher is called once during reopen, and by definition called from a
single thread, so it will be uncontended. The added cost is surely minor, while
keeping the code simple.
I didn't raise this due to perf reasons. I think using AtomicRef make is
simpler since it encapsulates everything rather than using synchronized +
volatile
we'd replace this:
{code}
final G oldThingy = current;
current = newThingy;
release(oldThingy);
{code}
with:
{code}
release(atomicRef.getAndSet(newThingy));
{code}
seems simpler to me though... for read access you simply call atomicRef.get()
> Generalize SearcherManager
> --------------------------
>
> Key: LUCENE-3761
> URL: https://issues.apache.org/jira/browse/LUCENE-3761
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/search
> Reporter: Shai Erera
> Assignee: Shai Erera
> Priority: Minor
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3761.patch, LUCENE-3761.patch
>
>
> I'd like to generalize SearcherManager to a class which can manage instances
> of a certain type of interfaces. The reason is that today SearcherManager
> knows how to handle IndexSearcher instances. I have a SearcherManager which
> manages a pair of IndexSearcher and TaxonomyReader pair.
> Recently, few concurrency bugs were fixed in SearcherManager, and I realized
> that I need to apply them to my version as well. Which led me to think why
> can't we have an SM version which is generic enough so that both my version
> and Lucene's can benefit from?
> The way I see SearcherManager, it can be divided into two parts: (1) the part
> that manages the logic of acquire/release/maybeReopen (i.e., ensureOpen,
> protect from concurrency stuff etc.), and (2) the part which handles
> IndexSearcher, or my SearcherTaxoPair. I'm thinking that if we'll have an
> interface with incRef/decRef/tryIncRef/maybeRefresh, we can make
> SearcherManager a generic class which handles this interface.
> I will post a patch with the initial idea, and we can continue from there.
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