/*
 * 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.join;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.NumericDocValuesField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.store.ByteBuffersDirectory;
import org.apache.lucene.store.Directory;
import org.apache.lucene.tests.util.LuceneTestCase;
import org.apache.lucene.tests.util.RamUsageTester;
import org.apache.lucene.util.Accountable;

public class TestNumericScoreJoinRamBytesUsed extends LuceneTestCase {

  public void testRamBytesUsed() throws Exception {
    try (Directory dir = new ByteBuffersDirectory()) {
      try (IndexWriter w = new IndexWriter(dir, new IndexWriterConfig())) {
        for (int i = 0; i < 5000; i++) {
          Document doc = new Document();
          doc.add(new NumericDocValuesField("from", i));
          w.addDocument(doc);
        }
      }
      try (DirectoryReader reader = DirectoryReader.open(dir)) {
        Query q =
            JoinUtil.createJoinQuery(
                "from",
                false,
                "to",
                Integer.class,
                new MatchAllDocsQuery(),
                new IndexSearcher(reader),
                ScoreMode.Max);
        long retained = RamUsageTester.ramUsed(q);
        // expected: ramBytesUsed() within 5% of the retained heap (as in TestPointQueries)
        assertEquals((double) retained, (double) ((Accountable) q).ramBytesUsed(), retained / 20.d);
      }
    }
  }
}