/**
    *
    * 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 org.apache.hadoop.hbase;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotEquals;
  
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.apache.hadoop.hbase.util.DNS;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category(SmallTests.class)
  public class TestHDFSBlocksDistribution {
    @Test
    public void testAddHostsAndBlockWeight() throws Exception {
      HDFSBlocksDistribution distribution = new HDFSBlocksDistribution();
      distribution.addHostsAndBlockWeight(null, 100);
      assertEquals("Expecting no hosts weights", 0, distribution.getHostAndWeights().size());
      distribution.addHostsAndBlockWeight(new String[0], 100);
      assertEquals("Expecting no hosts weights", 0, distribution.getHostAndWeights().size());
      distribution.addHostsAndBlockWeight(new String[] {"test"}, 101);
      assertEquals("Should be one host", 1, distribution.getHostAndWeights().size());
      distribution.addHostsAndBlockWeight(new String[] {"test"}, 202);
      assertEquals("Should be one host", 1, distribution.getHostAndWeights().size());
      assertEquals("test host should have weight 303", 303,
          distribution.getHostAndWeights().get("test").getWeight());
      distribution.addHostsAndBlockWeight(new String[] {"testTwo"}, 222);
      assertEquals("Should be two hosts", 2, distribution.getHostAndWeights().size());
      assertEquals("Total weight should be 525", 525, distribution.getUniqueBlocksTotalWeight());
    }
  
    public class MockHDFSBlocksDistribution extends HDFSBlocksDistribution {
      public Map<String,HostAndWeight> getHostAndWeights() {
        HashMap<String, HostAndWeight> map = new HashMap<String, HostAndWeight>();
        map.put("test", new HostAndWeight(null, 100));
        return map;
      }
  
    }
  
    @Test
    public void testAdd() throws Exception {
      HDFSBlocksDistribution distribution = new HDFSBlocksDistribution();
      distribution.add(new MockHDFSBlocksDistribution());
      assertEquals("Expecting no hosts weights", 0, distribution.getHostAndWeights().size());
      distribution.addHostsAndBlockWeight(new String[]{"test"}, 10);
      assertEquals("Should be one host", 1, distribution.getHostAndWeights().size());
      distribution.add(new MockHDFSBlocksDistribution());
      assertEquals("Should be one host", 1, distribution.getHostAndWeights().size());
      assertEquals("Total weight should be 10", 10, distribution.getUniqueBlocksTotalWeight());
    }
  
    @Test
    public void testLocalHostCompatibility() throws Exception {
      String currentHost = DNS.getDefaultHost("default", "default");
      HDFSBlocksDistribution distribution = new HDFSBlocksDistribution();
      assertEquals("Locality should be 0.0", 0.0,
        distribution.getBlockLocalityIndex(currentHost), 0.01);
      distribution.addHostsAndBlockWeight(new String[] { "localhost" }, 10);
      assertEquals("Should be one host", 1, distribution.getHostAndWeights().size());
      assertEquals("Locality should be 0.0", 0.0,
        distribution.getBlockLocalityIndex("test"), 0.01);
      assertNotEquals("Locality should be 0.0", 0.0,
        distribution.getBlockLocalityIndex(currentHost), 0.01);
    }
  
  }