The servlet is the main entry point for incoming requests, it also includes some init codes when the portal is launched. This servlet (org.gatein.wci.command.CommandServlet) is automatically added during deployment and mapped to /tomcatgateinservlet.

This is equivalent to adding the following to web.xml.

<servlet>

  <servlet-name>TomcatGateInServlet</servlet-name>

  <servlet-class>org.gatein.wci.command.CommandServlet</servlet-class>

  <load-on-startup>0</load-on-startup>

</servlet>

  

<servlet-mapping>

  <servlet-name>TomcatGateInServlet</servlet-name>

  <url-pattern>/tomcatgateinservlet</url-pattern>

</servlet-mapping>

It is possible to filter on the CommandServlet by filtering the URL pattern used by the Servlet mapping.

The example below would create a servlet filter that calculates the time of execution of a portlet request.

The filter class:

package org.example;


import java.io.IOException;


import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;


public class MyFilter implements javax.servlet.Filter {


  public void doFilter(ServletRequest request, ServletResponse response,

      FilterChain chain) throws IOException, ServletException

  {

    long beforeTime = System.currentTimeMillis();

    chain.doFilter(request, response);

    long afterTime = System.currentTimeMillis();

    System.out.println("Time to execute the portlet request (in ms): " + (afterTime - beforeTime));

  }


  public void init(FilterConfig config) throws ServletException

  {

  }


  public void destroy()

  {

  }


}

The Java EE web application configuration file (web.xml) of the portlet on which we want to know the time to serve a portlet request. As mentioned above, GateIn 3.2 does not require anything special to be included, only the URL pattern to set has to be known.

<?xml version="1.0"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

    version="2.5">

        

  <filter>

    <filter-name>MyFilter</filter-name>

    <filter-class>org.example.MyFilter</filter-class>        

  </filter>



  <filter-mapping>

    <filter-name>MyFilter</filter-name>

    <url-pattern>/tomcatgateinservlet</url-pattern>

    <dispatcher>INCLUDE</dispatcher>  

  </filter-mapping>    

    

</web-app>