jpountz commented on code in PR #13596:
URL: https://github.com/apache/lucene/pull/13596#discussion_r1753802080
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lucene/test-framework/src/java/org/apache/lucene/tests/index/PerThreadPKLookup.java:
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@@ -97,5 +174,28 @@ public int lookup(BytesRef id) throws IOException {
return -1;
}
- // TODO: add reopen method to carry over re-used enums...?
+ /**
+ * Reuse loaded segments' termsEnum and postingsEnum.
+ *
+ * @return null if there are no changes; else, a new PerThreadPKLookup
instance which you must
+ * eventually close its reader by {@link #closeReader}.
+ * @throws IOException if there is a low-level IO error.
+ */
+ public PerThreadPKLookup reopen() throws IOException {
+ DirectoryReader newReader =
DirectoryReader.openIfChanged((DirectoryReader) reader);
+ if (newReader == null) {
+ return null;
+ }
+
+ return new PerThreadPKLookup(this, newReader);
Review Comment:
It would be nice if we could factor the two constructors together, e.g. by
having a private constructor take a `Map<CacheKey, PerSegmentCorePKLookup>`
cache, where PerSegmentCorePKLookup would be a record around the various things
we want to reuse across reopens (TermEnum and PostingsEnum), and that would be
empty when called from the non-reusing constructor.
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