ATG | Configure request handling pipeline servlets [Customize request handling pipeline]

Below are the two common ways to configure [create] request handling pipeline servlets in ATG.

1. Extend atg.servlet.pipeline.PipelineableServletImpl.

2. Extend atg.servlet.pipeline.InsertableServletImpl.

1. Extend atg.servlet.pipeline.PipelineableServletImpl 

Follow below steps to configure servlet using PipelineableServletImpl.

• Extend atg.servlet.pipeline.PipelineableServletImpl.
• Define the servlet as a globally scoped Nucleus component.
• Reset the previous servlet’s nextServlet property to point to the new servlet.
• Set the new servlet’s nextServlet property to point to the next servlet in the pipeline.
• Add the servlet’s path to the initialServices property of /atg/dynamo/servlet/Initial. 

 2. Extend atg.servlet.pipeline.InsertableServletImpl

Follow below steps to configure servlet using InsertableServletImpl.

• Extend atg.servlet.pipeline.InsertableServletImpl.
• Define the servlet as a globally scoped Nucleus component.
• 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 StoreServlet as follows :
  insertAfterServlet=/atg/dynamo/servlet/dafpipeline/StoreServlet
• Add the servlet’s path to the initialServices property of /atg/dynamo/servlet/Initial

Advantage of second approach is you no need to make any change in the existing servlets.