jpountz commented on code in PR #14482:
URL: https://github.com/apache/lucene/pull/14482#discussion_r2059104981
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lucene/core/src/java/org/apache/lucene/store/Directory.java:
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@@ -79,6 +83,31 @@ public abstract class Directory implements Closeable {
*/
public abstract long fileLength(String name) throws IOException;
+ protected void validateIOContext(IOContext context) {
+ Map<Class<? extends IOContext.FileOpenHint>, List<IOContext.FileOpenHint>>
hintClasses =
+
context.hints().stream().collect(Collectors.groupingBy(IOContext.FileOpenHint::getClass));
+
+ // there should only be one of FileType, FileData, DataAccess
+ List<IOContext.FileOpenHint> fileTypes =
+ hintClasses.getOrDefault(FileTypeHint.class, List.of());
+ if (fileTypes.size() > 1) {
+ throw new IllegalArgumentException("Multiple file type hints specified:
" + fileTypes);
+ }
+ List<IOContext.FileOpenHint> fileData =
hintClasses.getOrDefault(FileDataHint.class, List.of());
+ if (fileData.size() > 1) {
+ throw new IllegalArgumentException("Multiple file data hints specified:
" + fileData);
+ }
+ List<IOContext.FileOpenHint> dataAccess =
+ hintClasses.getOrDefault(DataAccessHint.class, List.of());
+ if (dataAccess.size() > 1) {
+ throw new IllegalArgumentException("Multiple data access hints
specified: " + dataAccess);
+ }
+ }
+
+ protected ReadAdvice toReadAdvice(IOContext context) {
Review Comment:
> or we use some sort of lambda override similar to setPreload
FWIW one thing I like about it is that the `ReadAdvice` then becomes an
implementation detail of `MMapDirectory` instead of a general API on
`Directory`.
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