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https://issues.apache.org/jira/browse/LUCENENET-480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295239#comment-13295239
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Christopher Currens commented on LUCENENET-480:
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I'm assuming we're going to define some sort of symbol to compile code if it's
3.5 vs 4.0. If so, we can do a few things to make it easier.
1. We can. The only reason we're using the interface is because Java is. I
can see in the future this might be a problem if we has to use a set class that
was not HashSet...but at least not it's not a problem. Alternatively, we can
write our own ISet class based on the .NET 4.0 one, and use a class that wraps
HashSet and implements ISet.
2. I think the only way to do this one is write our own, as you said.
3. We can just define these in the support class, when using .NET 3.5
{code}
public delegate TResult Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, TResult>(T1
arg1, T2 arg2, T3 arg3, T4 arg4,
T5
arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9)
public delegate TResult Func<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10,
TResult>(T1 arg1, T2 arg2, T3 arg3, T4 arg4,
T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9, T10 arg10)
{code}
4. We can either use Digy's (I think it uses a WeakHashTable) or we can write
our own (more work), using Thread.AllocateDataSlot(). I believe that is how it
is done internally in .NET 4.
5. ParallelMultiSearcher does have the biggest changes between .NET 3.5 (and
actually Java's version of the class, because of the use of Tasks instead of
manually spawning threads). I feel like we could remove it from the 3.5
version (at least for now), or have two versions of 3.5, where one has a
dependency on the TPL for 3.5.
> Investigate what needs to happen to make both .NET 3.5 and 4.0 builds possible
> ------------------------------------------------------------------------------
>
> Key: LUCENENET-480
> URL: https://issues.apache.org/jira/browse/LUCENENET-480
> Project: Lucene.Net
> Issue Type: Task
> Components: Lucene.Net Contrib, Lucene.Net Core, Lucene.Net Demo,
> Lucene.Net Test
> Affects Versions: Lucene.Net 2.9.4, Lucene.Net 2.9.4g, Lucene.Net 3.0.3
> Reporter: Christopher Currens
>
> We need to investigate what needs to be done with the source to be able to
> support both a .NET 3.5 and 4.0 build. There was some concern from at least
> one member of the community ([see
> here|http://mail-archives.apache.org/mod_mbox/lucene-lucene-net-dev/201202.mbox/%3C004b01cce111$871f4990$955ddcb0$@fr%3E])
> that we've alienated some of our user base by making such a heavy jump from
> 2.0 to 4.0. There are major benefits to using 4.0 over the 2.0-based
> runtimes, specifically FAR superior memory management, particularly with the
> LOH, where Lucene.NET has had major trouble with in the past.
> Based on what has been done with Lucene.NET 3.0.3, we can't (easily) drop
> .NET 3.5/3.0 libraries and go back to 2.0. HashSet<T> and ISet<T> is used
> extensively in the code, that would be a major blocker to get done. I
> suppose it could be possible, but there hasn't been a whole lot of talk about
> what runtimes we intend to support. The big change between lucene 2.x and
> 3.x for java was also a change in runtimes, that allowed generics and enums
> to be used in the base code. We have a similar situation with the API (it's
> substantially different, with the addition of properties alone) for this next
> version of Lucene.NET, so I think it's reasonable to at least make a
> permanent move from 2.0 to 3.5, though that's only my opinion, hasn't been
> discussed with the committers.
> It seems that supporting 3.5 and 4.0 should be fairly easy, and is a decent
> compromise in supporting both a 2.0 and 4.0 runtime. At the very least, we
> should try our best to support it.
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