lucene/core/src/test/org/apache/lucene/index/TestBufferedUpdates.java

/*
 * 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.index;

import org.apache.lucene.search.TermQuery;
import org.apache.lucene.util.LuceneTestCase;

/**
 * Unit test for {@link BufferedUpdates}
 */
public class TestBufferedUpdates extends LuceneTestCase {

  public void testRamBytesUsed() {
    BufferedUpdates bu = new BufferedUpdates("seg1");
    assertEquals(bu.ramBytesUsed(), 0L);
    assertFalse(bu.any());
    int queries = atLeast(1);
    for (int i = 0; i < queries; i++) {
      final int docIDUpto = random().nextBoolean() ? Integer.MAX_VALUE : random().nextInt();
      final Term term = new Term("id", Integer.toString(random().nextInt(100)));
      bu.addQuery(new TermQuery(term), docIDUpto);
    }

    int terms = atLeast(1);
    for (int i = 0; i < terms; i++) {
      final int docIDUpto = random().nextBoolean() ? Integer.MAX_VALUE : random().nextInt();
      final Term term = new Term("id", Integer.toString(random().nextInt(100)));
      bu.addTerm(term, docIDUpto);
    }
    assertTrue("we have added tons of docIds, terms and queries", bu.any());

    long totalUsed = bu.ramBytesUsed();
    assertTrue(totalUsed > 0);

    bu.clearDeleteTerms();
    assertTrue("only terms and docIds are cleaned, the queries are still in memory", bu.any());
    assertTrue("terms are cleaned, ram in used should decrease", totalUsed > bu.ramBytesUsed());

    bu.clear();
    assertFalse(bu.any());
    assertEquals(bu.ramBytesUsed(), 0L);
  }
}