[GitHub] [lucenenet] NightOwl888 commented on issue #630: Is there any Lucene.NET object mapper?

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NightOwl888 commented on issue #630:
URL: https://github.com/apache/lucenenet/issues/630#issuecomment-1085883859


   LukeMapper uses [Reflection.Emit](https://docs.microsoft.com/en-us/dotnet/framework/reflection-and-codedom/emitting-dynamic-methods-and-assemblies) to generate on-demand MSIL code at runtime, which it compiles and caches after the first hit. This is a very good approach that will have a small impact on runtime performance.
   
   However, the object mapping could potentially be made into a compile-time [source generator](https://docs.microsoft.com/en-us/dotnet/csharp/roslyn-sdk/source-generators-overview), which would eliminate the need for the initial runtime compile and cache. In other words, there would be absolutely no runtime performance impact because it would generate the cumbersome-to-maintain code based on the easy-to-maintain configuration, which would be compiled into the end user's assembly. There is an extensive [list of source generators](https://github.com/amis92/csharp-source-generators#readme) being maintained where various approaches to source generation can be analyzed.
   
   LukeMapper's entry point is on `IndexSearcher`. `IndexSearcher` [may be used with `SearcherManager` to make it threadsafe](https://github.com/apache/lucenenet/issues/616#issuecomment-1054364945), which should be taken into account in the design.


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