content: /**
   * 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
   *
   *     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.aurora.common.stats;
  
  import org.apache.aurora.common.quantity.Amount;
  import org.apache.aurora.common.quantity.Time;
  import org.apache.aurora.common.stats.SlidingStats.Timeable;
  import org.apache.aurora.common.util.testing.FakeClock;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.fail;
  
  public class SlidingStatsTest {
  
    private static final long OPERATION_TIME = 5L;
    private static final Amount<Long, Time> OPERATION_TIME_AMOUNT =
        Amount.of(OPERATION_TIME, Time.NANOSECONDS);
  
    private FakeClock clock;
    private TimedActions actions;
    private SlidingStats stat;
  
    @Before
    public void setUp() {
      clock = new FakeClock();
      actions = new TimedActions(clock);
      stat = new SlidingStats("a", "nanos", 1, clock);
    }
  
    @Test
    public void testAccumulate() {
      assertEquals(0L, stat.getEventCounter().get());
      assertEquals(0L, stat.getTotalCounter().get());
  
      stat.accumulate(100L);
  
      assertEquals(1L, stat.getEventCounter().get());
      assertEquals(100L, stat.getTotalCounter().get());
    }
  
    @Test
    public void testTimeable() {
      String value = stat.time(() -> actions.quietAction("World"));
      assertEquals("HelloWorld", value);
      assertEquals(1L, stat.getEventCounter().get());
      assertEquals(OPERATION_TIME, stat.getTotalCounter().get());
    }
  
    @Test
    public void testNoResultQuietTimeable() {
      stat.time((Timeable.NoResult.Quiet) actions::noResultQuietAction);
      assertEquals(1L, stat.getEventCounter().get());
      assertEquals(OPERATION_TIME, stat.getTotalCounter().get());
    }
  
    @Test
    public void testTimeableThrowsException() {
      String value = null;
      try {
        value = stat.time(actions::action);
        fail("Should have thrown exception.");
      } catch (Exception e) {
        assertEquals("Expected!", e.getMessage());
      }
      assertNull(value);
      assertEquals(1L, stat.getEventCounter().get());
      assertEquals(OPERATION_TIME, stat.getTotalCounter().get());
    }
  
    @Test
    public void testNoResultTimeableThrowsException() {
      try {
        stat.time((Timeable.NoResult<Exception>) actions::noResultAction);
        fail("Should have thrown exception.");
      } catch (Exception e) {
        assertEquals("Expected!", e.getMessage());
      }
      assertEquals(1L, stat.getEventCounter().get());
      assertEquals(OPERATION_TIME, stat.getTotalCounter().get());
    }
  
    @Test
    public void testQuietTimeableThrowsRuntimeException() {
      String value = null;
      try {
        value = stat.time(actions::quietExceptionalAction);
        fail("Should have thrown exception.");
      } catch (RuntimeException e) {
        assertEquals("Expected!", e.getMessage());
      }
      assertNull(value);
      assertEquals(1L, stat.getEventCounter().get());
      assertEquals(OPERATION_TIME, stat.getTotalCounter().get());
    }
  
    private static class TimedActions {
      private FakeClock clock;
  
      public TimedActions(FakeClock clock) {
        this.clock = clock;
      }
  
      String action() throws Exception{
        clock.advance(OPERATION_TIME_AMOUNT);
        throw new Exception("Expected!");
      }
  
      String quietAction(String input) {
        clock.advance(OPERATION_TIME_AMOUNT);
        return "Hello" + input;
      }
  
      String quietExceptionalAction() {
        clock.advance(OPERATION_TIME_AMOUNT);
        throw new RuntimeException("Expected!");
      }
  
      void noResultAction() throws Exception {
        clock.advance(OPERATION_TIME_AMOUNT);
        throw new Exception("Expected!");
      }
  
      void noResultQuietAction() {
        clock.advance(OPERATION_TIME_AMOUNT);
        System.gc();
      }
    }
  }
  