/**
    * 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.SmallTests;
  import org.apache.hadoop.hbase.testclassification.MetricsTests;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  @Category({MetricsTests.class, SmallTests.class})
  public class TestMetricsRegionSourceImpl {
  
    @SuppressWarnings("SelfComparison")
    @Test
    public void testCompareToHashCodeEquals() throws Exception {
      MetricsRegionServerSourceFactory fact = CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class);
  
      MetricsRegionSource one = fact.createRegion(new RegionWrapperStub("TEST"));
      MetricsRegionSource oneClone = fact.createRegion(new RegionWrapperStub("TEST"));
      MetricsRegionSource two = fact.createRegion(new RegionWrapperStub("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));
      assertTrue( two.compareTo(two) == 0);
    }
  
  
    @Test(expected = RuntimeException.class)
    public void testNoGetRegionServerMetricsSourceImpl() throws Exception {
      // This should throw an exception because MetricsRegionSourceImpl should only
      // be created by a factory.
      CompatibilitySingletonFactory.getInstance(MetricsRegionSource.class);
    }
  
    static class RegionWrapperStub implements MetricsRegionWrapper {
  
      private String regionName;
  
      public RegionWrapperStub(String regionName) {
        this.regionName = regionName;
      }
  
      @Override
      public String getTableName() {
        return null;
      }
  
      @Override
      public String getNamespace() {
        return null;
      }
  
      @Override
      public String getRegionName() {
        return this.regionName;
      }
  
      @Override
      public long getNumStores() {
        return 0;
      }
  
      @Override
      public long getNumStoreFiles() {
        return 0;
      }
  
      @Override
      public long getStoreRefCount() {
        return 0;
      }
  
      @Override
     public int getMaxCompactedStoreFileRefCount() {
       return 0;
     }
 
     @Override
     public long getMemstoreSize() {
       return 0;
     }
 
     @Override
     public long getStoreFileSize() {
       return 0;
     }
 
     @Override
     public long getReadRequestCount() {
       return 0;
     }
 
     @Override
     public long getMaxStoreFileAge() {
       return 0;
     }
 
     @Override
     public long getMinStoreFileAge() {
       return 0;
     }
 
     @Override
     public long getAvgStoreFileAge() {
       return 0;
     }
 
     @Override
     public long getNumReferenceFiles() {
       return 0;
     }
 
     @Override
     public long getWriteRequestCount() {
       return 0;
     }
 
     @Override
     public long getNumFilesCompacted() {
       return 0;
     }
 
     @Override
     public long getNumBytesCompacted() {
       return 0;
     }
 
     @Override
     public long getLastMajorCompactionAge() {
       return 0;
     }
 
     @Override
     public long getNumCompactionsCompleted() {
       return 0;
     }
 
     @Override
     public long getNumCompactionsFailed() {
       return 0;
     }
 
     @Override
     public int getRegionHashCode() {
       return regionName.hashCode();
     }
 
     /**
      * Always return 0 for testing
      */
     @Override
     public int getReplicaId() {
       return 0;
     }
 
     @Override
     public long getNumCompactionsQueued() {
       return 0;
     }
 
     @Override
     public long getNumFlushesQueued() {
       return 0;
     }
 
     @Override
     public long getMaxCompactionQueueSize() {
       return 0;
     }
 
     @Override
     public long getMaxFlushQueueSize() {
       return 0;
     }
   }
 }