content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.worker.block;
  
  import static org.junit.Assert.assertEquals;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import alluxio.Constants;
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.metrics.MetricInfo;
  import alluxio.metrics.MetricKey;
  import alluxio.metrics.MetricsSystem;
  import alluxio.worker.block.DefaultBlockWorker.Metrics;
  
  import com.google.common.collect.ImmutableMap;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * Unit tests for {@link DefaultBlockWorker.Metrics}.
   */
  public final class BlockWorkerMetricsTest {
    private static final String MEM = Constants.MEDIUM_MEM;
    private static final String HDD = Constants.MEDIUM_HDD;
  
    private BlockWorker mBlockWorker;
    private BlockStoreMeta mBlockStoreMeta;
  
    @Before
    public void before() throws Exception {
      Configuration.set(PropertyKey.WORKER_TIERED_STORE_LEVELS, 2);
      Configuration.set(PropertyKey.Template.WORKER_TIERED_STORE_LEVEL_ALIAS.format(0), MEM);
      Configuration.set(PropertyKey.Template.WORKER_TIERED_STORE_LEVEL_ALIAS.format(1), HDD);
      MetricsSystem.clearAllMetrics();
      mBlockWorker = mock(BlockWorker.class);
      mBlockStoreMeta = mock(BlockStoreMeta.class);
      when(mBlockWorker.getStoreMeta()).thenReturn(mBlockStoreMeta);
      when(mBlockWorker.getStoreMetaFull()).thenReturn(mBlockStoreMeta);
      Metrics.registerGauges(mBlockWorker);
    }
  
    @Test
    public void testMetricsCapacity() throws InterruptedException {
      when(mBlockStoreMeta.getCapacityBytes()).thenReturn(1000L);
      Assert.assertEquals(1000L, getGauge(MetricKey.WORKER_CAPACITY_TOTAL.getName()));
      when(mBlockStoreMeta.getUsedBytes()).thenReturn(200L);
      // sleep 5 seconds because the timeout of this registered is CacheGauge,
      // and it's update interval is 5 seconds
      Thread.sleep(DefaultBlockWorker.CACHEGAUGE_UPDATE_INTERVAL);
      Assert.assertEquals(200L, getGauge(MetricKey.WORKER_CAPACITY_USED.getName()));
      Assert.assertEquals(800L, getGauge(MetricKey.WORKER_CAPACITY_FREE.getName()));
    }
  
    @Test
    public void testMetricsTierCapacity() throws InterruptedException {
      when(mBlockStoreMeta.getCapacityBytesOnTiers())
          .thenReturn(ImmutableMap.of(MEM, 1000L, HDD, 2000L));
      when(mBlockStoreMeta.getUsedBytesOnTiers()).thenReturn(ImmutableMap.of(MEM, 100L, HDD, 200L));
      Thread.sleep(DefaultBlockWorker.CACHEGAUGE_UPDATE_INTERVAL);
      assertEquals(1000L,
          getGauge(MetricKey.WORKER_CAPACITY_TOTAL.getName() + MetricInfo.TIER + MEM));
      assertEquals(2000L,
          getGauge(MetricKey.WORKER_CAPACITY_TOTAL.getName() + MetricInfo.TIER + HDD));
      assertEquals(100L, getGauge(MetricKey.WORKER_CAPACITY_USED.getName() + MetricInfo.TIER + MEM));
      assertEquals(200L, getGauge(MetricKey.WORKER_CAPACITY_USED.getName() + MetricInfo.TIER + HDD));
      assertEquals(900L, getGauge(MetricKey.WORKER_CAPACITY_FREE.getName() + MetricInfo.TIER + MEM));
      assertEquals(1800L, getGauge(MetricKey.WORKER_CAPACITY_FREE.getName() + MetricInfo.TIER + HDD));
    }
  
    @Test
    public void testMetricBocksCached() {
      when(mBlockStoreMeta.getNumberOfBlocks()).thenReturn(200);
      Assert.assertEquals(200, getGauge(MetricKey.WORKER_BLOCKS_CACHED.getName()));
    }
  
    private Object getGauge(String name) {
      return MetricsSystem.METRIC_REGISTRY.getGauges()
          .get(MetricsSystem.getMetricName(name)).getValue();
    }
  }
  