/* */package com.sun.j2ee.workflow.control.actions;import com.sun.j2ee.workflow.control.exceptions.WorkflowAppException;import javax.servlet.http.HttpServletRequest;/** This class is the base interface to flow handlers on the * web tier. * @author Jian (James) Cai */public interface FlowHandler extends java.io.Serializable {    public void doStart(HttpServletRequest request);    public String processFlow(HttpServletRequest request) throws WorkflowAppException;    public void doEnd(HttpServletRequest request);}