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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.dnode;

/*
 * #%L
 * Splout SQL Server
 * %%
 * Copyright (C) 2012 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.util.List;

import com.splout.db.common.SploutConfiguration;
import com.splout.db.thrift.DNodeException;
import com.splout.db.thrift.DeployAction;
import com.splout.db.thrift.RollbackAction;
import com.splout.db.thrift.TablespaceVersion;

/**
 * Use this interface for implementing the business logic of the {@link DNode} service. One may want to do this for
 * implementing unit tests and validating that the DNode receives requests.
 */
public interface IDNodeHandler {

	public void init(SploutConfiguration config) throws Exception;

	/**
	 * Method called when {@link #init(SploutConfiguration)} has been performed and the service is ready to accept
	 * request. Typically, this method will register the service as ready in the cluster.
	 */
	public void giveGreenLigth();

	public String sqlQuery(String tablespace, long version, int partition, String query)
	    throws DNodeException;

	public String deploy(final List deployActions, final long version) throws DNodeException;

	public String rollback(List rollbackActions, String ignoreMe) throws DNodeException;

	public String status() throws DNodeException;

	public String abortDeploy(long version) throws DNodeException;

	public String deleteOldVersions(List versions) throws DNodeException;

	public String testCommand(String command) throws DNodeException;

	public void stop() throws Exception;
}