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indexing_and_psi_stubs.md: note about Gist performance

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Yann Cébron 2023-05-31 15:49:06 +02:00
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topics/basics/indexing_and_psi_stubs.md
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<!-- Copyright 2000-2022 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
<!-- Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. -->
# Indexing and PSI Stubs
@ -47,6 +47,8 @@ Sometimes, the following conditions hold:
A [file-based index](file_based_indexes.md) can be used in such cases, but file gists provide a way to perform data calculation lazily, caching on disk, and a more lightweight API.
Please see [`VirtualFileGist`](%gh-ic%/platform/indexing-api/src/com/intellij/util/gist/VirtualFileGist.java) and [`PsiFileGist`](%gh-ic%/platform/indexing-api/src/com/intellij/util/gist/PsiFileGist.java) documentation.
> Note performance implications noted in [`VirtualFileGist`](%gh-ic%/platform/indexing-api/src/com/intellij/util/gist/VirtualFileGist.java) Javadoc.
**Example:**
- `VirtualFileGist`: [`ImageInfoIndex`](%gh-ic%/images/src/org/intellij/images/index/ImageInfoIndex.java) calculating image dimensions/bit depth needed to be displayed in specific parts of UI.