Quadcap Embeddable Server

com/quadcap/http/server22/WebServlet.java

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 package com.quadcap.http.server22;

/* Copyright 1999 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.io.IOException;

import java.util.Enumeration;
import java.util.Properties;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.SingleThreadModel;

import com.quadcap.util.Debug;

/**
 * Represents a configured servlet, whether active or not.  If we implemented
 * servlet garbage collection, we would free the servlet resources from
 * here.
 *
 * @author Stan Bailes
 */
public class WebServlet implements ServletConfig {
    WebApplication              app;
    Servlet                     servlet                 = null;
    boolean                     singleThreadModel       = false;
    String                      servletName;
    String                      servletClass;
    String                      jspFile;
    int                         loadOnStartup           = -1;
    Properties                  initParams              = new Properties();

    public WebServlet() {
    }

    public String toString() {
        return servletName;
    }
    
    public void setServletName(String name) {
        this.servletName = name;
    }

    public String getServletName() {
        return servletName;
    }

    public void setServletClass(String name) {
        this.servletClass = name;
    }

    public String getServletClass() {
        return servletClass;
    }

    public void setJspFile(String name) {
        this.jspFile = name;
    }

    public String getJspFile() {
        return jspFile;
    }

    public void setLoadOnStartup(int loadOnStartup) {
        this.loadOnStartup = loadOnStartup;
    }

    public int getLoadOnStartup() {
        return loadOnStartup;
    }

    public void addInitParam(String prop, String val) {
        initParams.setProperty(prop, val);
    }

    public Enumeration getInitParameterNames() {
        return initParams.keys();
    }

    public String getInitParameter(String name) {
        return initParams.getProperty(name);
    }

    public void setWebApplication(WebApplication app) {
        this.app = app;
    }

    public WebApplication getWebApplication() {
        return app;
    }

    public ServletContext getServletContext() {
        return app;
    }

//      public void setServlet(Servlet servlet) {
//          this.servlet = servlet;
//      }

//      public Servlet getServlet() {
//          return servlet;
//      }

    final void init() throws ServletException {
        synchronized (this) {
            if (servlet == null) {
                try {
                    Class c = app.getClassLoader().loadClass(servletClass);
                    Servlet s = (Servlet)c.newInstance();
                    singleThreadModel =  (s instanceof SingleThreadModel);
                    s.init(this);
                    servlet = s;
                } catch (ServletException e) {
                    throw e;
                } catch (Throwable t) {
                    Debug.print(t);
                    throw new ServletException(t.toString());
                }
            }
        }
    }
    
    public void service(ServletRequest req, ServletResponse res)
        throws ServletException, IOException
    {
        if (servlet == null) init();
        if (singleThreadModel) {
            synchronized (servlet) {
                servlet.service(req, res);
            }
        } else {
            servlet.service(req, res);
        }
    }
}