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 BrutexQuartzConnectionProvider 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;
        }
}