Subversion Repositories XServices

/*

 *   Copyright 2011 Brian Rosenberger (Brutex Network)

 *

 *   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

 *

 *       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 net.brutex.xservices.util;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DatabaseMetaData;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.List;

import org.apache.log4j.Level;

import org.apache.log4j.Logger;

import org.quartz.utils.ConnectionProvider;

/**

 * @author Brian Rosenberger

 *

 */

public class BrutexHSQLQuartzConnectionProvider implements ConnectionProvider {

	private Connection conn = null;

	private final Logger logger = Logger.getLogger(this.getClass().getCanonicalName());

	public Connection getConnection() throws SQLException {

		if( conn!= null && conn.isValid(5)) {

			logger.debug("Checking tables on pre-exisiting database connection.");

			checkTables();

			return conn;

		}

		try {

			// Class.forName("org.hsqldb.jdbc.JDBCDriver" );

			Class.forName("org.apache.derby.jdbc.EmbeddedDriver");

		} catch (Exception e) {

			logger.fatal("Failed to load Derby JDBC driver.");

			e.printStackTrace();

			return null;

		}

		if(isConnected(false)) {

			checkTables();

		} else {

			return null;

		}

		return conn;

	}

	public void shutdown() throws SQLException {

		try {

			// Class.forName("org.hsqldb.jdbc.JDBCDriver" );

			Class.forName("org.apache.derby.jdbc.EmbeddedDriver");

		} catch (Exception e) {

			System.err.println("ERROR: failed to load Derby JDBC driver.");

			e.printStackTrace();

			return;

		}

		String t = this.getClass().getClassLoader().getResource("/").toString()

				.substring(6);

		t += "../data/db";

		System.out.println("Shut down embedded database now.");

		Connection c = DriverManager.getConnection("jdbc:derby:" + t

				+ ";shutdown=true;");

	}

	private synchronized void recursiveDelete(File dbDir) {

		File[] files = dbDir.listFiles();

		for (int i = 0; i < files.length; i++) {

			if (files[i].isFile()) {

				files[i].delete();

			} else {

				recursiveDelete(files[i]);

				files[i].delete();

			}

		}

		dbDir.delete();

	}

	private synchronized void checkTables() throws SQLException {

		logger.debug("Checking QUARTZ database schema.");

		if(!isConnected(false)) {

			logger.error("Failed to validate QUARTZ database schema.");

			return;

		}

		List<String> ddl_list = new ArrayList<String>(11);

		ddl_list.add("QRTZ_JOB_DETAILS");

		ddl_list.add("QRTZ_TRIGGERS");

		ddl_list.add("QRTZ_SIMPLE_TRIGGERS");

		ddl_list.add("QRTZ_CRON_TRIGGERS");

		ddl_list.add("QRTZ_SIMPROP_TRIGGERS");

		ddl_list.add("QRTZ_BLOB_TRIGGERS");

		ddl_list.add("QRTZ_CALENDARS");

		ddl_list.add("QRTZ_PAUSED_TRIGGER_GRPS");

		ddl_list.add("QRTZ_FIRED_TRIGGERS");

		ddl_list.add("QRTZ_SCHEDULER_STATE");

		ddl_list.add("QRTZ_LOCKS");

		String ddl = this.getClass().getClassLoader().getResource("/").toString()

		.substring(6)+ "../data/";

		DatabaseMetaData dmd = conn.getMetaData();

		for (String tbl : ddl_list) {

			ResultSet rs = dmd.getTables(null, "APP", tbl, null);

			if (!rs.next()) {

				logger.log(Level.INFO, "Adding DDL for table "+ tbl);

				Statement st = conn.createStatement();

				File ddlFile = new File(ddl + tbl + ".ddl");

				String create = "";

				try {

						BufferedReader r = new BufferedReader(new FileReader(ddlFile));

						while (r.ready()) {

							create += r.readLine() + "\n";

						}

						create.trim();

						if( st.execute(create)) {

							logger.log(Level.INFO, "Table " + tbl + " created.");

						}

					} catch (FileNotFoundException ex) {

						ex.printStackTrace();

					} catch (IOException ex) {

						ex.printStackTrace();

					} catch (SQLException ex) {

						logger.log(Level.ERROR, "Error executing statement "+ create );

						System.out.println(ex.getMessage());

					}

				} else {

					logger.trace("Table "+tbl+" exists.");

				}

			}

		}

	private synchronized boolean isConnected(boolean fail) throws SQLException {

		if(conn!=null && conn.isValid(5)) {

			return true;

		} else {

			String t = this.getClass().getClassLoader().getResource("/").toString().substring(6); // WEB-INF/classes

			t += "../data/db";

			logger.debug("Database directory is set to '" + t + "'");

			try {

				this.conn = DriverManager.getConnection("jdbc:derby:" + t + ";create=true;");

			} catch (SQLException ex) {

				logger.error(ex.getMessage(), ex);

				if(!fail) {

					logger.warn("Deleting database directory.");

					recursiveDelete(new File(t));

					logger.warn("Retrying to connect to database.");

					return isConnected(true);

				} else {

					return false;

				}

			}

		}

		return false;

	}

}