gautamworah96 commented on a change in pull request #179:
URL: https://github.com/apache/lucene/pull/179#discussion_r696495553
##########
File path:
lucene/facet/src/java/org/apache/lucene/facet/taxonomy/directory/DirectoryTaxonomyReader.java
##########
@@ -351,12 +348,140 @@ public FacetLabel getPath(int ordinal) throws
IOException {
}
synchronized (categoryCache) {
- categoryCache.put(catIDInteger, ret);
+ categoryCache.put(ordinal, ret);
}
return ret;
}
+ private FacetLabel getPathFromCache(int ordinal) {
+ // TODO: can we use an int-based hash impl, such as IntToObjectMap,
+ // wrapped as LRU?
+ synchronized (categoryCache) {
+ return categoryCache.get(ordinal);
+ }
+ }
+
+ private void checkOrdinalBounds(int ordinal) throws IllegalArgumentException
{
+ if (ordinal < 0 || ordinal >= indexReader.maxDoc()) {
+ throw new IllegalArgumentException(
+ "ordinal "
+ + ordinal
+ + " is out of the range of the indexReader "
+ + indexReader.toString()
+ + ". The maximum possible ordinal number is "
+ + (indexReader.maxDoc() - 1));
+ }
+ }
+
+ /**
+ * Returns an array of FacetLabels for a given array of ordinals.
+ *
+ * <p>This API is generally faster than iteratively calling {@link
#getPath(int)} over an array of
+ * ordinals. It uses the {@link #getPath(int)} method iteratively when it
detects that the index
+ * was created using StoredFields (with no performance gains) and uses
DocValues based iteration
+ * when the index is based on BinaryDocValues. Lucene switched to
BinaryDocValues in version 9.0
+ *
+ * @param ordinals Array of ordinals that are assigned to categories
inserted into the taxonomy
+ * index
+ */
+ public FacetLabel[] getBulkPath(int... ordinals) throws IOException {
+ ensureOpen();
+
+ int ordinalsLength = ordinals.length;
+ FacetLabel[] bulkPath = new FacetLabel[ordinalsLength];
+ // remember the original positions of ordinals before they are sorted
+ int[] originalPosition = new int[ordinalsLength];
+ Arrays.setAll(originalPosition, IntUnaryOperator.identity());
+
+ for (int i = 0; i < ordinalsLength; i++) {
+ // check whether the ordinal is valid before accessing the cache
+ checkOrdinalBounds(ordinals[i]);
+ // check the cache before trying to find it in the index
+ FacetLabel ordinalPath = getPathFromCache(ordinals[i]);
Review comment:
Yes. This should obviously be better. Fixed in the next commit
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