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   * 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.metrics;
  
  import java.util.List;
  import java.util.concurrent.TimeoutException;
  
  import org.apache.cassandra.metrics.Sampler.Sample;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  public class MaxSamplerTest extends SamplerTest
  {
      @Before
      public void setSampler()
      {
          this.sampler = new MaxSampler<String>()
          {
              public String toString(String value)
              {
                  return value;
              }
          };
      }
  
      @Test
      public void testReturnsMax() throws TimeoutException
      {
          sampler.beginSampling(5, 100000);
          add();
          List<Sample<String>> result = sampler.finishSampling(10);
          for (int i = 9995 ; i < 10000 ; i ++)
          {
              final String key = "test" + i;
              Assert.assertTrue(result.stream().anyMatch(s -> s.value.equals(key)));
          }
      }
  
      @Test
      public void testSizeEqualsCapacity() throws TimeoutException
      {
          sampler.beginSampling(10, 100000);
          add();
          List<Sample<String>> result = sampler.finishSampling(10);
          for (int i = 9990 ; i < 10000 ; i ++)
          {
              final String key = "test" + i;
              Assert.assertTrue(result.stream().anyMatch(s -> s.value.equals(key)));
          }
      }
  
      @Test
      public void testCapacityLarger() throws TimeoutException
      {
  
          sampler.beginSampling(100, 100000);
          add();
          List<Sample<String>> result = sampler.finishSampling(10);
          for (int i = 9990 ; i < 10000 ; i ++)
          {
              final String key = "test" + i;
              Assert.assertTrue(result.stream().anyMatch(s -> s.value.equals(key)));
          }
      }
  
      private void add() throws TimeoutException
      {
          for (int i = 0 ; i < 10000 ; i ++)
          {
              // dont load shed test data
              if (i % 999 == 0)
                  waitForEmpty(1000);
              sampler.addSample("test"+i, i);
          }
          waitForEmpty(1000);
      }
  }
  