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.cassandra.index.sai.utils;
  
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  public class NamedMemoryLimiterTest
  {
      @Rule
      public final ExpectedException exception = ExpectedException.none();
      
      @Test
      public void shouldStartAtZeroUsage()
      {
          NamedMemoryLimiter limiter = new NamedMemoryLimiter(9, "Test");
          assertEquals(0, limiter.currentBytesUsed());
          assertFalse(limiter.usageExceedsLimit());
      }
  
      @Test
      public void shouldRegisterUsageBelowLimit()
      {
          NamedMemoryLimiter limiter = new NamedMemoryLimiter(9, "Test");
          limiter.increment(4);
          assertEquals(4, limiter.currentBytesUsed());
          assertFalse(limiter.usageExceedsLimit());
      }
  
      @Test
      public void shouldRegisterUsageExceedingLimit()
      {
          NamedMemoryLimiter limiter = new NamedMemoryLimiter(9, "Test");
          limiter.increment(10);
          assertEquals(10, limiter.currentBytesUsed());
          assertTrue(limiter.usageExceedsLimit());
      }
  
      @Test
      public void shouldReturnBelowLimit()
      {
          NamedMemoryLimiter limiter = new NamedMemoryLimiter(9, "Test");
          
          limiter.increment(10);
          assertEquals(10, limiter.currentBytesUsed());
          assertTrue(limiter.usageExceedsLimit());
  
          limiter.decrement(3);
          assertEquals(7, limiter.currentBytesUsed());
          assertFalse(limiter.usageExceedsLimit());
      }
  
      @Test
      public void shouldZeroTrackerAfterFlush()
      {
          NamedMemoryLimiter limiter = new NamedMemoryLimiter(9, "Test");
          limiter.increment(5);
          limiter.decrement(5);
          assertEquals(0, limiter.currentBytesUsed());
          assertFalse(limiter.usageExceedsLimit());
      }
  }
  