/**
    * 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.assertTrue;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotEquals;
  
  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;
  
  /**
   *  Test for MetricsTableSourceImpl
   */
  @Category({MetricsTests.class, SmallTests.class})
  public class TestMetricsTableSourceImpl {
  
    @Test
    public void testCompareToHashCode() throws Exception {
      MetricsRegionServerSourceFactory metricsFact =
          CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class);
  
      MetricsTableSource one = metricsFact.createTable("ONETABLE", new TableWrapperStub("ONETABLE"));
      MetricsTableSource oneClone = metricsFact.createTable("ONETABLE", new TableWrapperStub("ONETABLE"));
      MetricsTableSource two = metricsFact.createTable("TWOTABLE", new TableWrapperStub("TWOTABLE"));
  
      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 testNoGetTableMetricsSourceImpl() throws Exception {
      // This should throw an exception because MetricsTableSourceImpl should only
      // be created by a factory.
      CompatibilitySingletonFactory.getInstance(MetricsTableSourceImpl.class);
    }
  
    @Test
    public void testGetTableMetrics() throws Exception{
      MetricsTableSource oneTbl =
          CompatibilitySingletonFactory.getInstance(MetricsRegionServerSourceFactory.class)
          .createTable("ONETABLE", new TableWrapperStub("ONETABLE"));
      assertEquals("ONETABLE", oneTbl.getTableName());
    }
  
    static class TableWrapperStub implements MetricsTableWrapperAggregate {
  
      private String tableName;
  
      public TableWrapperStub(String tableName) {
        this.tableName = tableName;
      }
  
      @Override
      public long getReadRequestsCount(String table) {
        return 10;
      }
  
      @Override
      public long getWriteRequestsCount(String table) {
        return 20;
      }
  
      @Override
      public long getTotalRequestsCount(String table) {
        return 30;
      }
  
      @Override
      public long getMemstoresSize(String table) {
        return 1000;
      }
  
      @Override
     public long getStoreFilesSize(String table) {
       return 2000;
     }
 
     @Override
     public long getTableSize(String table) {
       return 3000;
     }
 
     public String getTableName() {
       return tableName;
     }
   }
 }