org.apache.tajo.catalog.store.DerbyStore.java Source code

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Here is the source code for org.apache.tajo.catalog.store.DerbyStore.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * 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
 * 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.
 */

/**
 *
 */
package org.apache.tajo.catalog.store;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.tajo.catalog.CatalogUtil;
import org.apache.tajo.exception.TajoInternalError;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class DerbyStore extends AbstractDBStore {

    private static final Log LOG = LogFactory.getLog(DerbyStore.class);
    public static final String NAME = "derby";
    public static final String CATALOG_DRIVER = "org.apache.derby.jdbc.EmbeddedDriver";

    protected String getCatalogDriverName() {
        return CATALOG_DRIVER;
    }

    public DerbyStore(final Configuration conf) {
        super(conf);
    }

    protected Connection createConnection(Configuration conf) throws SQLException {
        return DriverManager.getConnection(getCatalogUri());
    }

    @Override
    public String readSchemaFile(String filename) {
        return super.readSchemaFile("derby/" + filename);
    }

    public static void shutdown() {
        Connection conn = null;
        // shutdown embedded database.
        try {
            // the shutdown=true attribute shuts down Derby.
            conn = DriverManager.getConnection("jdbc:derby:;shutdown=true");
        } catch (SQLException se) {
            if ((se.getErrorCode() == 50000) && (se.getSQLState().equals("XJ015"))) {
                // tajo got the expected exception
                LOG.info("Derby shutdown complete normally.");
            } else {
                LOG.info("Derby shutdown complete abnormally. - message: " + se.getMessage());
            }
        } finally {
            CatalogUtil.closeQuietly(conn);
        }
        LOG.info("Shutdown database");
    }

    @Override
    protected void createDatabaseDependants() {
        String schemaName = catalogSchemaManager.getCatalogStore().getSchema().getSchemaName();
        Statement stmt = null;

        if (schemaName != null && !schemaName.isEmpty()) {
            try {
                stmt = getConnection().createStatement();
                stmt.executeUpdate("CREATE SCHEMA " + schemaName);
            } catch (SQLException e) {
                throw new TajoInternalError(e);
            } finally {
                CatalogUtil.closeQuietly(stmt);
            }
        }
    }

    @Override
    protected String getCatalogSchemaPath() {
        return "schemas/derby";
    }
}