com.zving.preloader.facade.ServletFacade Maven / Gradle / Ivy
package com.zving.preloader.facade;
import com.zving.preloader.PreClassLoader;
import com.zving.preloader.Reloader;
import java.io.IOException;
import java.util.HashMap;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ServletFacade
extends HttpServlet
{
private static final long serialVersionUID = 1L;
private ServletConfig config;
private Servlet servlet;
private static HashMap instances = new HashMap();
public static HashMap getInstances()
{
return instances;
}
public void init(ServletConfig config)
throws ServletException
{
this.config = config;
loadServlet();
instances.put(config.getInitParameter("class"), this);
}
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
if ((this.servlet != null) && (!Reloader.isReloading)) {
this.servlet.service(request, response);
}
}
public void unloadClass()
{
if (this.servlet != null) {
try
{
this.servlet.destroy();
}
catch (Throwable localThrowable) {}
}
this.servlet = null;
}
public void loadServlet()
throws ServletException
{
String className = this.config.getInitParameter("class");
if (className == null) {
return;
}
synchronized (this)
{
try
{
Class clazz = PreClassLoader.load(className);
if ((clazz == null) || (!Servlet.class.isAssignableFrom(clazz))) {
throw new ServletException("Class " + className + " not found or not a servlet!");
}
this.servlet = ((Servlet)clazz.newInstance());
this.servlet.init(this.config);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
public void destroy()
{
if (this.servlet != null) {
this.servlet.destroy();
}
}
}