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Posted to dev@lucenenet.apache.org by "Stefano (Jira)" <ji...@apache.org> on 2019/10/31 11:13:00 UTC
[jira] [Commented] (LUCENENET-602) Error using Lucene.Net.Facet
4.8.0-beta00005 with Xamarin.iOS
[ https://issues.apache.org/jira/browse/LUCENENET-602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16963883#comment-16963883 ]
Stefano commented on LUCENENET-602:
-----------------------------------
Hi Shad,
we encountered the same issue about LurchTable reported by Axel, while using the facets on Xamarin iOS.
If it can help, we've found this issue, where the same problem is discussed: [https://github.com/mono/mono/issues/7016]
The problem is due to the the use, in LurchTable, of some structs that implement some generic interfaces.
It seems that they tried to handle this situation in Mono, but actually it doesn't work yet.
At the end of the discussion, they says here [https://github.com/mono/sysdrawing-coregraphics/pull/24]
"Replace LurchTable with much simpler LruCache.
The LurchTable was quite a complex code that was not necessary for the particular use. In fact it used so complex generics that it managed to break Mono AOT in some cases (mono/mono#7016)."
We tried the other fixes you proposed in the previous comments, but they didn't work.
It worked by replacing the structs in LurchTable with classes, but actually we don't know which other problems this can create, so I think this is not a good solution.
Do you suggest any other solution?
We are available for further test.
> Error using Lucene.Net.Facet 4.8.0-beta00005 with Xamarin.iOS
> --------------------------------------------------------------
>
> Key: LUCENENET-602
> URL: https://issues.apache.org/jira/browse/LUCENENET-602
> Project: Lucene.Net
> Issue Type: Bug
> Components: Lucene.Net.Facet
> Affects Versions: Lucene.Net 4.8.0
> Environment: Xamarin Forms 3.0.0.561731
> Ios 10.3.3 and Higher
> Lucene.Net.Facet 4.8.0-beta00005
> Reporter: Enrico Caltran
> Priority: Minor
> Labels: AOT, Xamarin.iOS, lucene.net.facet
> Fix For: Lucene.Net 4.8.0
>
> Attachments: AppTestLucene.zip, image-2019-08-08-02-26-40-582.png
>
> Original Estimate: 120h
> Remaining Estimate: 120h
>
> I'm using Lucene.Net.Facet 4.8.0-beta00005 in a big Xamarin project.
> +With Xamarin.Android and Xamarin.UWP it's all right.+
> *+But With Xamarin.iOS on device (Ipad)+*, i'm receiving this error:
> _Attempting to JIT compile method 'Lucene.Net.Support.LurchTable2<Lucene.Net.Facet.Taxonomy.FacetLabel, Lucene.Net.Facet.Taxonomy.Directory.DirectoryTaxonomyReader/Int32Class>:InternalInsert<Lucene.Net.Support.LurchTable2/Add2Info<Lucene.Net.Facet.Taxonomy.FacetLabel, Lucene.Net.Facet.Taxonomy.Directory.DirectoryTaxonomyReader/Int32Class>> (int,Lucene.Net.Facet.Taxonomy.FacetLabel,int&,Lucene.Net.Support.LurchTable`2/Add2Info<Lucene.Net.Facet.Taxonomy.FacetLabel, Lucene.Net.Facet.Taxonomy.Directory.DirectoryTaxonomyReader/Int32Class>&)' while running in aot-only mode. See [https://developer.xamarin.com/guides/ios/advanced_topics/limitations/] for more information._
> _{color:#d04437}at Lucene.Net.Support.LurchTable2[TKey,TValue].Insert[T] (TKey key, T& value) <0x2570f48 + 0x000e0> in <063e095c95d945a4ace32ab83d1227eb#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at (wrapper unknown) System.Object.gsharedvt_in() at Lucene.Net.Support.LurchTable2[TKey,TValue].AddOrUpdate (TKey key, TValue addValue, Lucene.Net.Support.KeyValueUpdate2[TKey,TValue] fnUpdate) <0x232824c + 0x0013b> in <063e095c95d945a4ace32ab83d1227eb#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Lucene.Net.Facet.Taxonomy.LRUHashMap2[TKey,TValue].Put (TKey key, TValue value) <0x2c487f8 + 0x0015b> in <79d3a7b905954d0993025c09c5d087ce#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Lucene.Net.Facet.Taxonomy.Directory.DirectoryTaxonomyReader.GetOrdinal (Lucene.Net.Facet.Taxonomy.FacetLabel cp) <0x2c51970 + 0x0019b> in <79d3a7b905954d0993025c09c5d087ce#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Lucene.Net.Facet.Taxonomy.Int32TaxonomyFacets.GetTopChildren{color} (System.Int32 topN, System.String dim, System.String[] path) <0x2c481dc + 0x0008f> in <79d3a7b905954d0993025c09c5d087ce#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Login.MyMB.Lucene.Client.LuceneArticoliSearcher.GetListaArticoloXRicercaAvanzataConRicercaSemplice (System.Collections.Generic.List1[T] listParametri) <0x224add0 + 0x001bb> in <8f49891e0f0546e185aba7424d294ef7#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at Login.MyMB.Lucene.Client.LuceneArticoliSearcher.GetListaArticoloConRicercaSemplice (System.Collections.Generic.List1[T] listParametri) <0x224afbc + 0x0009f> in <8f49891e0f0546e185aba7424d294ef7#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 at MyMB.Forms.RicercaLucene.RicercaArticoloLucene.GetListaArticoliXRicercaSemplice (Login.MyMB.Interface.IAmbiente ambiente, Login.MyMB.Lucene.Client.LuceneArticoliSearcher las, System.Collections.Generic.List`1[T] ListParametri, System.Boolean isAbilitataRicercaBarcode) <0xe47fc0 + 0x000e7> in <f1bb3149abe145459612794f1a096634#2ae0fea9ea4eacaef83bf2e9713bb8ea>:0 ..............................._
> At the link [https://docs.microsoft.com/it-it/xamarin/ios/internals/limitations] , I found the problem cause (I suppose...):
> _Value types as Dictionary Keys Using a value type as a Dictionary<TKey, TValue> key is problematic, as the default Dictionary constructor attempts to use EqualityComparer<TKey>.Default. EqualityComparer<TKey>.Default, in turn, attempts to use Reflection to instantiate a new type which implements the IEqualityComparer<TKey> interface. This works for reference types (as the reflection+create a new type step is skipped), but for value types it crashes and burns rather quickly once you attempt to use it on the device. Workaround: Manually implement the IEqualityComparer<TKey> interface in a new type and provide an instance of that type to the Dictionary<TKey, TValue> (IEqualityComparer<TKey>) constructor._
> So, what can I do? Thank you in advance, Enrico Caltran +393357485560 [enrico.caltran@timegroup.it|mailto:enrico.caltran@timegroup.it]
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