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Glassfish example source code file (DerbyControl.java)

This example Glassfish source code file (DerbyControl.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Glassfish tags/keywords

class, db_log_filename, derbycontrol, derbycontrol, file, file, fileoutputstream, io, object, object, printstream, reflection, string, string, stringmanager, throwable

The Glassfish DerbyControl.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.enterprise.admin.cli.optional;

import java.io.File;
import java.lang.reflect.Method;
import java.io.PrintStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.glassfish.api.admin.CommandException;
import com.sun.enterprise.util.i18n.StringManager;

/**
 *  This class uses Java reflection to invoke Derby
 *  NetworkServerControl class.
 *  This class is used to start/stop/ping derby database.
 *  The reason for creating this class instead of directly
 *  invoking NetworkServerControl from the StartDatabaseCommand
 *  class is so that a separate JVM is launched when starting the
 *  database and the control is return to CLI.  
 *  @author <a href="mailto:jane.young@sun.com">Jane Young
 *  @version  $Revision: 1.13 $
 */
public final class DerbyControl
{
    final public static String DB_LOG_FILENAME = "derby.log";
    final private String derbyCommand;
    final private String derbyHost;
    final private String derbyPort;
    final private String derbyHome;
    final private boolean redirect;
    final private String derbyUser;
    final private String derbyPassword;


        //constructor 
    public DerbyControl(final String dc, final String dht, final String dp,
                        final String redirect, final String dhe, final String duser, final String dpwd)
    {
        this.derbyCommand = dc;
        this.derbyHost = dht;
        this.derbyPort = dp;
        this.derbyHome = dhe;
	this.redirect = Boolean.valueOf(redirect).booleanValue();
        this.derbyUser = duser;
        this.derbyPassword = dpwd;

	    if (this.redirect) {

	        try {
                String dbLog = "";
                if (this.derbyHome == null) {
                    // if derbyHome is null then redirect the output to a temporary file
                    // which gets deleted after the jvm exists.
		            dbLog = createTempLogFile();
                }
		    else {
		        dbLog = createDBLog(this.derbyHome);
		    }
            
                //redirect stdout and stderr to a file
                PrintStream printStream = new PrintStream(new FileOutputStream(dbLog, true), true);
                System.setOut(printStream);
                System.setErr(printStream);
            }
            catch (Throwable t) {
	            t.printStackTrace();
	            //exit with an error code of 2
	            System.exit(2);
            }
        }
        //do not set derby.system.home if derbyHome is empty
        if (this.derbyHome!=null && this.derbyHome.length()>0) {
            System.setProperty("derby.system.home", this.derbyHome);
        }
	    //set the property to not overwrite log file
	    System.setProperty("derby.infolog.append", "true");
    }
    
        //constructor
    public DerbyControl(final String dc, final String dht, final String dp)
    {
        this(dc,dht,dp,"true", null, null, null);
    }
    
        //constructor
    public DerbyControl(final String dc, final String dht, final String dp, final String redirect)
    {
        this(dc,dht,dp,redirect,null, null, null);
    }

     //constructor
    public DerbyControl(final String dc, final String dht, final String dp, final String redirect, final String dhe)
    {
        this(dc,dht,dp,redirect,dhe, null, null);
    }

    public DerbyControl(final String dc, final String dht, final String dp, final String redirect, final String duser, final String dpassword)
    {
        this(dc,dht,dp,redirect,null, duser, dpassword);
    }

        /**
         * This methos invokes the Derby's NetworkServerControl to start/stop/ping
         * the database.
         */
    private void invokeNetworkServerControl()
    {
        try {
            Class networkServer = Class.forName("org.apache.derby.drda.NetworkServerControl");
            Method networkServerMethod = networkServer.getDeclaredMethod("main",
                                                       new Class[]{String[].class});
            Object [] paramObj = null;
            if (derbyUser == null && derbyPassword == null) {
                paramObj = new Object[]{new String[]{derbyCommand, "-h", derbyHost, "-p", derbyPort}};
            } else {
                paramObj = new Object[]{new String[]{derbyCommand, "-h", derbyHost, "-p", derbyPort, "-user", derbyUser, "-password", derbyPassword}};
            }
           
            networkServerMethod.invoke(networkServer, paramObj);
        }
        catch (Throwable t) {
	        t.printStackTrace();
	        System.exit(2);
        }
    }


        /**
         * create a db.log file that stdout/stderr will redirect to.
         * dbhome is the derby.system.home directory where derb.log
         * gets created.  if user specified --dbhome options, derby.log
         * will be created there.
         **/
    private String createDBLog(final String dbHome) throws Exception
    {
        //dbHome must exist and  have write permission
        final File fDBHome = new File(dbHome);
	    String dbLogFileName = "";

        final StringManager lsm = StringManager.getManager(DerbyControl.class);
        if (fDBHome.isDirectory() && fDBHome.canWrite()) {
            final File fDBLog = new File(dbHome, DB_LOG_FILENAME);
	        dbLogFileName = fDBLog.toString();

            //if the file exists, check if it is writeable
            if (fDBLog.exists() && !fDBLog.canWrite()) {
	        System.out.println(lsm.getString("UnableToAccessDatabaseLog", dbLogFileName));
	        System.out.println(lsm.getString("ContinueStartingDatabase"));
	        //if exist but not able to write then create a temporary 
	        //log file and persist on starting the database
	        dbLogFileName = createTempLogFile();
            }
            else if (!fDBLog.exists()) {
                //create log file
                fDBLog.createNewFile();
            }
        }
        else {
            System.out.println(lsm.getString("InvalidDBDirectory", dbHome));
	        System.out.println(lsm.getString("ContinueStartingDatabase"));
	        //if directory does not exist then create a temporary log file
	        //and persist on starting the database
	        dbLogFileName = createTempLogFile();
        }
        return dbLogFileName;
    }

   /**
      creates a temporary log file.
   */
    private String  createTempLogFile() throws CommandException
    {
        String tempFileName = "";
        try {
            final File fTemp = File.createTempFile("foo", null);
            fTemp.deleteOnExit();
	        tempFileName = fTemp.toString();
	    }
	    catch (IOException ioe) {
            final StringManager lsm = StringManager.getManager(DerbyControl.class);
	        throw new CommandException(lsm.getString("UnableToAccessDatabaseLog", tempFileName));
	    }
        return tempFileName;
    }    
    
    public static void main(String[] args) {
        
        if (args.length<3){
            System.out.println("paramters not specified.");
            System.out.println("DerbyControl <derby command>    ");
            System.exit(1);
        }
        
        DerbyControl derbyControl = null;
        if (args.length == 3)
            derbyControl = new DerbyControl(args[0], args[1], args[2]);
        else if (args.length == 4 )
            derbyControl = new DerbyControl(args[0], args[1], args[2], args[3]);
        else if (args.length == 5)
             derbyControl = new DerbyControl(args[0], args[1], args[2], args[3], args[4]);
        else if (args.length > 5)
            derbyControl = new DerbyControl(args[0], args[1], args[2], args[3], args[4], args[5]);
        if (derbyControl != null)
            derbyControl.invokeNetworkServerControl();
    }
}


    

Other Glassfish examples (source code examples)

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