test/unit/org/apache/cassandra/db/memtable/ShardedMemtableConfigTest.java

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *     http://www.apache.org/licenses/LICENSE-2.0
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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"));
    }
}