/**
    * 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.regionserver;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotEquals;
  import static org.junit.Assert.assertTrue;
  
  import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
  import org.apache.hadoop.hbase.testclassification.MetricsTests;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category({MetricsTests.class, SmallTests.class})
  public class TestMetricsUserSourceImpl {
  
    @Test
    public void testCompareToHashCodeEquals() throws Exception {
      MetricsRegionServerSourceFactory fact
        = CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class);
  
      MetricsUserSource one = fact.createUser("ONE");
      MetricsUserSource oneClone = fact.createUser("ONE");
      MetricsUserSource two = fact.createUser("TWO");
  
      assertEquals(0, one.compareTo(oneClone));
      assertEquals(one.hashCode(), oneClone.hashCode());
      assertNotEquals(one, two);
  
      assertTrue(one.compareTo(two) != 0);
      assertTrue(two.compareTo(one) != 0);
      assertTrue(two.compareTo(one) != one.compareTo(two));
    }
  
    @Test (expected = RuntimeException.class)
    public void testNoGetRegionServerMetricsSourceImpl() throws Exception {
      // This should throw an exception because MetricsUserSourceImpl should only
      // be created by a factory.
      CompatibilitySingletonFactory.getInstance(MetricsUserSource.class);
    }
  
    @Test
    public void testGetUser() {
      MetricsRegionServerSourceFactory fact
        = CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class);
  
      MetricsUserSource one = fact.createUser("ONE");
      assertEquals("ONE", one.getUser());
    }
  
  }