BasicTimerTest.java

/**
 * Copyright 2013 Netflix, Inc.
 * <p/>
 * Licensed 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.netflix.servo.monitor;

import org.testng.annotations.Test;

import java.util.concurrent.TimeUnit;

import static org.testng.Assert.assertEquals;

public class BasicTimerTest extends AbstractMonitorTest<BasicTimer> {

  public BasicTimer newInstance(String name) {
    return new BasicTimer(MonitorConfig.builder(name).build());
  }

  @Test
  public void testGetValue() throws Exception {
    BasicTimer c = newInstance("foo");
    assertEquals(c.getValue().longValue(), 0L);
    assertEquals(c.getTotalTime().longValue(), 0L);
    assertEquals(c.getCount().longValue(), 0L);
    assertEquals(c.getMax().longValue(), 0L);

    c.record(42, TimeUnit.MILLISECONDS);
    assertEquals(c.getValue().longValue(), 42L);
    assertEquals(c.getTotalTime().longValue(), 42L);
    assertEquals(c.getCount().longValue(), 1L);
    assertEquals(c.getMax().longValue(), 42L);

    c.record(21, TimeUnit.MILLISECONDS);
    assertEquals(c.getValue().longValue(), 31L);
    assertEquals(c.getTotalTime().longValue(), 63L);
    assertEquals(c.getCount().longValue(), 2L);
    assertEquals(c.getMax().longValue(), 42L);

    c.record(84, TimeUnit.MILLISECONDS);
    assertEquals(c.getValue().longValue(), 49L);
    assertEquals(c.getTotalTime().longValue(), 147L);
    assertEquals(c.getCount().longValue(), 3L);
    assertEquals(c.getMax().longValue(), 84L);

    assertEquals(c.getValue().longValue(), 49L);
    assertEquals(c.getTotalTime().longValue(), 147L);
    assertEquals(c.getCount().longValue(), 3L);
    assertEquals(c.getMax().longValue(), 84L);
  }

  @Test
  public void testRecord0() throws Exception {
    BasicTimer c = newInstance("foo");
    assertEquals(c.getCount().longValue(), 0L);

    c.record(42, TimeUnit.MILLISECONDS);
    assertEquals(c.getCount().longValue(), 1L);

    // Explicit 0 should be counted
    c.record(0, TimeUnit.MILLISECONDS);
    assertEquals(c.getCount().longValue(), 2L);

    // Negative values should be ignored
    c.record(-1, TimeUnit.MILLISECONDS);
    assertEquals(c.getCount().longValue(), 2L);
  }

  @Test
  public void testFractional() throws Exception {
    BasicTimer timer = newInstance("foo");

    timer.record(1000, TimeUnit.NANOSECONDS);
    assertEquals(timer.getTotalTime(), 0.001);
    assertEquals(timer.getMax(), 0.001);
  }
}