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 com.alibaba.metrics;
  
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Ignore;
  import org.junit.Test;
  
  import java.util.concurrent.TimeUnit;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.offset;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  public class MeterTest {
      private final Clock clock = mock(Clock.class);
      private final Meter meter = new MeterImpl(clock);
  
      @Before
      public void setUp() throws Exception {
          when(clock.getTick()).thenReturn(0L, TimeUnit.SECONDS.toNanos(10));
  
      }
  
      @Test
      public void startsOutWithNoRatesOrCount() throws Exception {
          assertThat(meter.getCount())
                  .isZero();
  
          assertThat(meter.getMeanRate())
                  .isEqualTo(0.0, offset(0.001));
  
          assertThat(meter.getOneMinuteRate())
                  .isEqualTo(0.0, offset(0.001));
  
          assertThat(meter.getFiveMinuteRate())
                  .isEqualTo(0.0, offset(0.001));
  
          assertThat(meter.getFifteenMinuteRate())
                  .isEqualTo(0.0, offset(0.001));
      }
  
      @Test
      public void marksEventsAndUpdatesRatesAndCount() throws Exception {
          meter.mark();
          meter.mark(2);
  
          assertThat(meter.getMeanRate())
                  .isEqualTo(0.3, offset(0.001));
  
          assertThat(meter.getOneMinuteRate())
                  .isEqualTo(0.1840, offset(0.001));
  
          assertThat(meter.getFiveMinuteRate())
                  .isEqualTo(0.1966, offset(0.001));
  
          assertThat(meter.getFifteenMinuteRate())
                  .isEqualTo(0.1988, offset(0.001));
      }
  
      @Ignore
      @Test
      public void testMeterMarkPerformance() {
          long start = System.currentTimeMillis();
          for (int i = 0; i < 100000; i++) {
              meter.mark();
          }
          double durationPerMark = (System.currentTimeMillis() - start) / 100000.0;
          Assert.assertTrue("Average mark should cost less than 0.045 ms, current value: " + durationPerMark,
                  durationPerMark < 0.045d);
      }
  }
  