ATG Custom Servlet Pipeline

The atg.servlet.pipeline package provide interfaces for creating request handling pipeline servlets, All classes are directly or indirectly implement interface atg.servlet.pipeline.PipelineableServlet.

Step 1:	Write your servlet, extending  atg.servlet.pipeline.PipelineableServletImpl. import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import atg.servlet.*; import atg.servlet.pipeline.*; public class MyServlet extends PipelineableServletImpl {   public MyServlet () {}   public void service (DynamoHttpServletRequest request,                        DynamoHttpServletResponse response)        throws IOException, ServletException   {     String pathInfo = request.getPathInfo ();     // Insert here own logic     passRequest (request, response);   } }
Step 2:	Define global scope component in the Nucleus hierarchy. It does not really matter where you put your servlet in the component hierarchy (though the location affects references to other components if you use relative pathnames)
Step 3:	Set the nextServlet property of your servlet to point to the path of the pipeline servlet you want your servlet to follow. For example, if you want your servlet to follow the DynamoServlet in the pipeline, use: nextServlet=/atg/dynamo/servlet/dafpipeline/DynamoServlet
Step 4:	Add the path to your servlet to the initialServices property of /atg/dynamo/servlet/Inital.initialServices initialService+=/MyServlet

 The PipelineableServlet interface has two sub-interface that provide more fexibility for inserting new servlet into pipeline. See in below diagram.

Add InsertableServlet to the servlet pipeline:

Step 1:	Write your servlet by extending  atg.servlet.pipeline.InsertableServletImpl.see in below example
	import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import atg.servlet.*; import atg.servlet.pipeline.*; public class URIPrinter extends InsertableServletImpl{ public URIPrinter () {} public void service (DynamoHttpServletRequest request, DynamoHttpServletResponse response) throws IOException, ServletException { System.out.println ("Handling request for " +  request.getRequestURI ());passRequest (request, response);   }  }
Step 2:	Define the servlet as a globally scoped Nucleus component
Step 3:	Set the insertAfterServlet property of your servlet to point to the path of the pipeline servlet you want your servlet to follow. For example, you can insert a servlet after DynamoServlet as follows:       insertAfterServlet=/atg/dynamo/servlet/dafpipeline/DynamoServlet
Step 4:	Add the servlet’s path to the initialServices property of  /atg/dynamo/servlet/Initial:initialServices+=/URIPrinter