content: /*
   * 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.bifromq.basekv.store.range;
  
  import static org.testng.Assert.assertEquals;
  import static org.testng.Assert.assertTrue;
  
  import org.testng.annotations.Test;
  
  public class AdaptiveWriteBudgetTest {
      @Test
      public void shouldRespectDefaultMaxLimits() {
          AdaptiveWriteBudget budget = new AdaptiveWriteBudget();
  
          for (int i = 0; i < 20; i++) {
              budget.recordFlush(1_000_000, 10_000_000, 1);
          }
  
          assertEquals(budget.currentEntryLimit(), 128_000);
          assertEquals(budget.currentByteLimit(), 256L * 1024 * 1024);
      }
  
      @Test
      public void shouldGrowWhenFlushIsFast() {
          AdaptiveWriteBudget budget = new AdaptiveWriteBudget();
          long initialEntryLimit = budget.currentEntryLimit();
          long initialByteLimit = budget.currentByteLimit();
  
          budget.recordFlush(initialEntryLimit, initialByteLimit, 10);
  
          assertTrue(budget.currentEntryLimit() > initialEntryLimit);
          assertTrue(budget.currentByteLimit() > initialByteLimit);
      }
  
      @Test
      public void shouldShrinkWhenFlushIsSlow() {
          AdaptiveWriteBudget budget = new AdaptiveWriteBudget();
          long initialEntryLimit = budget.currentEntryLimit();
          long initialByteLimit = budget.currentByteLimit();
  
          budget.recordFlush(initialEntryLimit * 2, initialByteLimit * 2, 10);
          long increasedEntryLimit = budget.currentEntryLimit();
          long increasedByteLimit = budget.currentByteLimit();
          assertTrue(increasedEntryLimit > initialEntryLimit);
          assertTrue(increasedByteLimit > initialByteLimit);
  
          budget.recordFlush(increasedEntryLimit, increasedByteLimit, 200);
  
          assertTrue(budget.currentEntryLimit() < increasedEntryLimit);
          assertTrue(budget.currentByteLimit() < increasedByteLimit);
      }
  
      @Test
      public void shouldFlushWhenBudgetReached() {
          AdaptiveWriteBudget budget = new AdaptiveWriteBudget();
          long entryLimit = budget.currentEntryLimit();
          long byteLimit = budget.currentByteLimit();
  
          assertTrue(budget.shouldFlush(entryLimit, 0));
          assertTrue(budget.shouldFlush(0, byteLimit));
      }
  }
  