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.master.file;
  
  import static org.junit.Assert.assertEquals;
  import static org.mockito.Mockito.when;
  
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.master.file.DefaultFileSystemMaster.Metrics;
  import alluxio.master.file.meta.InodeTree;
  import alluxio.metrics.MetricKey;
  import alluxio.metrics.MetricsSystem;
  import alluxio.resource.CloseableResource;
  import alluxio.underfs.UfsManager;
  import alluxio.underfs.UnderFileSystem;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.mockito.Mockito;
  
  /**
   * Unit tests for {@link DefaultFileSystemMaster.Metrics}.
   */
  public class FileSystemMasterMetricsTest {
    private UfsManager mUfsManager;
    private InodeTree mInodeTree;
  
    @Before
    public void before() throws Exception {
      MetricsSystem.clearAllMetrics();
      mUfsManager = Mockito.mock(UfsManager.class);
      mInodeTree = Mockito.mock(InodeTree.class);
      Metrics.registerGauges(mUfsManager, mInodeTree);
    }
  
    @Test
    public void testMetricsFilesPinned() {
      when(mInodeTree.getPinnedSize()).thenReturn(100);
      assertEquals(100, getGauge(MetricKey.MASTER_FILES_PINNED.getName()));
    }
  
    @Test
    public void testMetricsPathsTotal() {
      when(mInodeTree.getInodeCount()).thenReturn(90L);
      assertEquals(90L, getGauge(MetricKey.MASTER_TOTAL_PATHS.getName()));
    }
  
    @Test
    public void testMetricsUfsCapacity() throws Exception {
      UfsManager.UfsClient client = Mockito.mock(UfsManager.UfsClient.class);
      UnderFileSystem ufs = Mockito.mock(UnderFileSystem.class);
      String ufsDataFolder = Configuration.getString(PropertyKey.MASTER_MOUNT_TABLE_ROOT_UFS);
      when(ufs.getSpace(ufsDataFolder, UnderFileSystem.SpaceType.SPACE_TOTAL)).thenReturn(1000L);
      when(ufs.getSpace(ufsDataFolder, UnderFileSystem.SpaceType.SPACE_USED)).thenReturn(200L);
      when(ufs.getSpace(ufsDataFolder, UnderFileSystem.SpaceType.SPACE_FREE)).thenReturn(800L);
      when(client.acquireUfsResource()).thenReturn(new CloseableResource<UnderFileSystem>(ufs) {
        @Override
        public void closeResource() {}
      });
      when(mUfsManager.getRoot()).thenReturn(client);
      assertEquals(1000L, getGauge(MetricKey.CLUSTER_ROOT_UFS_CAPACITY_TOTAL.getName()));
      assertEquals(200L, getGauge(MetricKey.CLUSTER_ROOT_UFS_CAPACITY_USED.getName()));
      assertEquals(800L, getGauge(MetricKey.CLUSTER_ROOT_UFS_CAPACITY_FREE.getName()));
    }
  
    private Object getGauge(String name) {
      return MetricsSystem.METRIC_REGISTRY.getGauges()
          .get(name).getValue();
    }
  }
  