DBFactory.java
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	/**
	* Copyright (c) 2010-2016 Yahoo! Inc., 2017 YCSB contributors All rights reserved.
	* <p>
	* Licensed 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
	* <p>
	* http://www.apache.org/licenses/LICENSE-2.0
	* <p>
	* 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. See accompanying
	* LICENSE file.
	*/

	package com.yahoo.ycsb;

	import org.apache.htrace.core.Tracer;

	import java.util.Properties;

	/**
	* Creates a DB layer by dynamically classloading the specified DB class.
	*/
	public final class DBFactory {
	private DBFactory() {
	// not used
	}

	public static AsyncDB newDB(String dbname, Properties properties, final Tracer tracer) throws UnknownDBException {
	ClassLoader classLoader = DBFactory.class.getClassLoader();

	AsyncDB ret;

	try {
	Class dbclass = classLoader.loadClass(dbname);

	if (DB.class.isAssignableFrom(dbclass)) {
	ret = new AsyncDBAdapter((DB) dbclass.getDeclaredConstructor().newInstance());
	} else {
	ret = (AsyncDB) dbclass.getDeclaredConstructor().newInstance();
	}
	} catch (Exception e) {
	e.printStackTrace();
	return null;
	}

	ret.setProperties(properties);

	return new DBWrapper(ret, tracer);
	}

	}