jpountz commented on code in PR #12374:
URL: https://github.com/apache/lucene/pull/12374#discussion_r1245354048
##########
lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java:
##########
@@ -1014,4 +1021,48 @@ private static SliceExecutor
getSliceExecutionControlPlane(Executor executor) {
return new SliceExecutor(executor);
}
+
+ /**
+ * Supplier for {@link LeafSlice} slices when passed in executor is
non-null. This supplier
+ * computes and caches the value on first invocation and returns cached
value on subsequent
+ * invocation. If the passed in provider for slice computation throws
exception then same will be
+ * passed to the caller of this supplier on each invocation. If the provider
returns null then
+ * {@link NullPointerException} will be thrown to the caller.
+ */
+ private static class CachingLeafSlicesSupplier implements
Supplier<LeafSlice[]> {
+ private volatile LeafSlice[] leafSlices;
+
+ private final Executor executor;
+
+ private final Function<List<LeafReaderContext>, LeafSlice[]> sliceProvider;
+
+ private final List<LeafReaderContext> leaves;
+
+ private CachingLeafSlicesSupplier(
+ Executor executor,
+ Function<List<LeafReaderContext>, LeafSlice[]> provider,
+ List<LeafReaderContext> leaves) {
+ this.executor = executor;
+ this.sliceProvider = Objects.requireNonNull(provider, "leaf slice
provider cannot be null");
+ this.leaves = Objects.requireNonNull(leaves, "list of LeafReaderContext
cannot be null");
+ }
+
+ @Override
+ public LeafSlice[] get() {
+ if (executor == null) {
+ return null;
+ }
Review Comment:
As an alternative, could you move this check into the `provider` lambda? It
still feels wrong to me that `CachingLeafSupplier` has to check the `executor`.
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