com.liusoft.util.hsqldb.HSQLEngineServlet.java Source code

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Here is the source code for com.liusoft.util.hsqldb.HSQLEngineServlet.java

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/*
 *  HSQLEngineServlet.java
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *  
 *  Author: Winter Lau (javayou@gmail.com)
 *  http://dlog4j.sourceforge.net
 */
package com.liusoft.util.hsqldb;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;

/**
 * ?HSQLEngine???????
 * ?Struts???HSQLDB
 * @author Winter Lau
 */
public class HSQLEngineServlet extends HttpServlet {

    String path = "/WEB-INF/db";
    String database = "mydlog";
    int port = 9001;
    HSQLEngine engine;

    /**
     * HSQLDB??
     */
    public void init() throws ServletException {
        String tPath = getInitParameter("path");
        if (StringUtils.isNotEmpty(tPath))
            path = tPath;
        String tDatabase = getInitParameter("database");
        if (StringUtils.isNotEmpty(tDatabase))
            database = tDatabase;
        String tPort = getInitParameter("port");
        if (StringUtils.isNumeric(tPort)) {
            int nPort = Integer.parseInt(tPort);
            if (nPort > 1024 && nPort < 65536)
                port = nPort;
        }
        String dataPath;
        if (path.startsWith("/"))
            dataPath = getServletContext().getRealPath(path);
        else
            dataPath = path;
        //?
        engine = HSQLEngine.getEngine(dataPath, port, database);
        engine.start();
        while (!engine.isRunning()) {
            try {
                Thread.sleep(200);
            } catch (Exception e) {
            }
        }
        log("HSQLEngine of DLOG4J started.");
    }

    /**
     * HSQLEngine??
     */
    protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        PrintWriter out = res.getWriter();
        if (engine == null)
            out.println("HSQLDB Engine initialize failed.");
        else if (engine.isRunning())
            out.println("HSQLDB Engine is running...");
        else
            out.println("HSQLDB Engine is stopped.");
    }

    /**
     * ??
     */
    public void destroy() {
        try {
            engine.stop();
        } catch (Exception e) {
        }
    }

}