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.metrics;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  import org.agrona.concurrent.NoOpLock;
  
  public class HitRateTest
  {
      static long M = 1024;
      @Test
      public void testRollingCounters()
      {
          ShardedHitRate.HitRateShard shard = new ShardedHitRate.HitRateShard(new NoOpLock());
          ShardedHitRate.Snapshot snapshot = new ShardedHitRate.Snapshot();
  
          long now = M/2;
          shard.markHitExclusive(now);
          shard.markHitExclusive(now);
          shard.markHitExclusive(now += M);
          shard.markHitExclusive(now);
          shard.markHitExclusive(now += M);
          shard.markHitExclusive(now);
          shard.markHitExclusive(now += M);
          shard.markHitExclusive(now);
          shard.markHitExclusive(now += M);
          shard.markHitExclusive(now);
          shard.updateSnapshot(snapshot, now);
          Assert.assertEquals(10, snapshot.totalHits);
          Assert.assertEquals(3, snapshot.requests(1));
          Assert.assertEquals(9, snapshot.requests(4));
          Assert.assertEquals(10, snapshot.requests(5));
          Assert.assertEquals(10, snapshot.requests(6));
          snapshot.reset();
          shard.updateSnapshot(snapshot, now + M/2);
          Assert.assertEquals(10, snapshot.totalHits);
          Assert.assertEquals(2, snapshot.requests(1));
          Assert.assertEquals(8, snapshot.requests(4));
          Assert.assertEquals(10, snapshot.requests(5));
          Assert.assertEquals(10, snapshot.requests(6));
      }
  }
  