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Splout SQL is a read only, horizontally scalable and partitioned SQL database that plays well with Hadoop.
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package com.splout.db.engine;

/*
 * #%L
 * Splout SQL Server
 * %%
 * Copyright (C) 2012 - 2013 Datasalt Systems S.L.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 * #L%
 */

import java.io.File;

import com.splout.db.common.SploutConfiguration;
import com.splout.db.common.TimeoutThread;
import com.splout.db.dnode.DNodeProperties;
import com.splout.db.thrift.PartitionMetadata;

/**
 * Stateful factory where engine-specific business logic for instantiating a {@link EngineManager} for each
 * {@link SploutEngine} is written. The DNode calls this factory at startup, closing time and everytime it needs to open a new
 * manager for a new data partition with associated {@link PartitionMetadata}.
 */
public class ManagerFactory {

	// private final static Log log = LogFactory.getLog(ManagerFactory.class);
	private SploutConfiguration config;
	private TimeoutThread timeoutThread;

	public void init(SploutConfiguration config) {
		this.config = config;
		timeoutThread = new TimeoutThread(config.getLong(DNodeProperties.MAX_QUERY_TIME));
		timeoutThread.start();
	}

	public void close() {
		timeoutThread.interrupt();
	}

	public EngineManager getManagerIn(File dbFolder, PartitionMetadata partitionMetadata) throws Exception {
		EngineManager manager = null;

		SploutEngine engine = SploutEngine.getDefault();
		// Assume default engine in case of no engine (to preserve backwards compatibility)
		if(partitionMetadata.getEngineId() != null) {
			engine = Class.forName(partitionMetadata.getEngineId()).asSubclass(SploutEngine.class)
			    .newInstance();
		}
		manager = Class.forName(engine.getEngineManagerClass()).asSubclass(EngineManager.class)
		    .newInstance();

		// Currently using first ".db" file found (there should be only one!)
		String dbFile = null;
		for(String file : dbFolder.list()) {
			if(file.endsWith(".db")) {
				dbFile = file;
				break;
			}
		}
		if(dbFile == null) {
			throw new RuntimeException("Can't find .db file in directory: " + dbFolder);
		}

		File absoluteDbFile = new File(dbFolder + "/" + dbFile);
		manager.init(absoluteDbFile, config, partitionMetadata.getInitStatements());

		if(manager instanceof SQLite4JavaManager) {
			((SQLite4JavaManager) manager).setTimeoutThread(timeoutThread);
		}

		return manager;
	}
}