[GitHub] [lucene] jpountz commented on a change in pull request #240: LUCENE-10002: Deprecate IndexSearch#search(Query, Collector) in favor of IndexSearcher#search(Query, CollectorManager)

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jpountz commented on a change in pull request #240:
URL: https://github.com/apache/lucene/pull/240#discussion_r688276995



##########
File path: lucene/core/src/java/org/apache/lucene/search/TopFieldCollectorManager.java
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@@ -0,0 +1,141 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.lucene.search;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * Create a TopFieldCollectorManager which uses a shared hit counter to maintain number of hits and
+ * a shared {@link MaxScoreAccumulator} to propagate the minimum score across segments if the
+ * primary sort is by relevancy.
+ *
+ * <p>Note that a new collectorManager should be created for each search due to its internal states.
+ */
+public class TopFieldCollectorManager implements CollectorManager<TopFieldCollector, TopFieldDocs> {
+  private final Sort sort;
+  private final int numHits;
+  private final FieldDoc after;
+  private final HitsThresholdChecker hitsThresholdChecker;
+  private final MaxScoreAccumulator minScoreAcc;
+  private final List<TopFieldCollector> collectors;
+
+  public TopFieldCollectorManager(Sort sort, int numHits, FieldDoc after, int totalHitsThreshold) {
+    if (totalHitsThreshold < 0) {
+      throw new IllegalArgumentException(
+          "totalHitsThreshold must be >= 0, got " + totalHitsThreshold);
+    }
+
+    this.sort = sort;
+    this.numHits = numHits;
+    this.after = after;
+    /*
+    nocommit
+    Should the following two be passed in instead? Possible custom initialization based on executor status and slices?
+    On the other hand, in a single-threaded environment, shared HitsThresholdChecker and MaxScoreAccumulator should be fast without lock contention anyway?

Review comment:
       Can you check if luceneutil benchmarks become slower with this change? Hopefully they're not slower and we can keep this logic simple.




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