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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.db.memtable;
  
  import java.io.IOException;
  import javax.management.Attribute;
  import javax.management.AttributeNotFoundException;
  import javax.management.InstanceNotFoundException;
  import javax.management.InvalidAttributeValueException;
  import javax.management.MBeanException;
  import javax.management.MalformedObjectNameException;
  import javax.management.ObjectName;
  import javax.management.ReflectionException;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.utils.FBUtilities;
  
  import static org.apache.cassandra.db.memtable.AbstractShardedMemtable.SHARDED_MEMTABLE_CONFIG_OBJECT_NAME;
  import static org.junit.Assert.assertEquals;
  
  public class ShardedMemtableConfigTest extends CQLTester
  {
      @BeforeClass
      public static void setup() throws Exception
      {
          startJMXServer();
          createMBeanServerConnection();
      }
  
      @Test
      public void testDefaultShardCountSetByJMX() throws MalformedObjectNameException, ReflectionException, AttributeNotFoundException, InstanceNotFoundException, MBeanException, IOException, InvalidAttributeValueException, InterruptedException
      {
          // check the default, but also make sure the class is initialized if the default memtable is not sharded
          assertEquals(FBUtilities.getAvailableProcessors(), AbstractShardedMemtable.getDefaultShardCount());
          jmxConnection.setAttribute(new ObjectName(SHARDED_MEMTABLE_CONFIG_OBJECT_NAME), new Attribute("DefaultShardCount", "7"));
          assertEquals(7, AbstractShardedMemtable.getDefaultShardCount());
          assertEquals("7", jmxConnection.getAttribute(new ObjectName(SHARDED_MEMTABLE_CONFIG_OBJECT_NAME), "DefaultShardCount"));
      }
  
      @Test
      public void testAutoShardCount() throws MalformedObjectNameException, ReflectionException, AttributeNotFoundException, InstanceNotFoundException, MBeanException, IOException, InvalidAttributeValueException
      {
          AbstractShardedMemtable.getDefaultShardCount();    // initialize class
          jmxConnection.setAttribute(new ObjectName(SHARDED_MEMTABLE_CONFIG_OBJECT_NAME), new Attribute("DefaultShardCount", "auto"));
          assertEquals(FBUtilities.getAvailableProcessors(), AbstractShardedMemtable.getDefaultShardCount());
          assertEquals(Integer.toString(FBUtilities.getAvailableProcessors()),
                       jmxConnection.getAttribute(new ObjectName(SHARDED_MEMTABLE_CONFIG_OBJECT_NAME), "DefaultShardCount"));
      }
  }
  