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.kafka.raft.internals;
  
  import org.apache.kafka.common.metrics.MetricConfig;
  import org.apache.kafka.common.utils.MockTime;
  
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  class TimeRatioTest {
  
      @Test
      public void testRatio() {
          MetricConfig config = new MetricConfig();
          MockTime time = new MockTime();
          TimeRatio ratio = new TimeRatio(1.0);
  
          ratio.record(config, 0.0, time.milliseconds());
          time.sleep(10);
          ratio.record(config, 10, time.milliseconds());
          time.sleep(10);
          ratio.record(config, 0, time.milliseconds());
          assertEquals(0.5, ratio.measure(config, time.milliseconds()));
  
          time.sleep(10);
          ratio.record(config, 10, time.milliseconds());
          time.sleep(40);
          ratio.record(config, 0, time.milliseconds());
          assertEquals(0.2, ratio.measure(config, time.milliseconds()));
      }
  
      @Test
      public void testRatioMisalignedWindow() {
          MetricConfig config = new MetricConfig();
          MockTime time = new MockTime();
          TimeRatio ratio = new TimeRatio(1.0);
  
          ratio.record(config, 0.0, time.milliseconds());
          time.sleep(10);
          ratio.record(config, 10, time.milliseconds());
          time.sleep(10);
  
          // No recordings, so the last 10ms are not counted.
          assertEquals(1.0, ratio.measure(config, time.milliseconds()));
  
          // Now the measurement of 5ms arrives. We measure the time since the last
          // recording, so 5ms/10ms = 0.5.
          ratio.record(config, 5, time.milliseconds());
          assertEquals(0.5, ratio.measure(config, time.milliseconds()));
      }
  
  }
  