JETServer Programmer's Guide

JETServer offers a unique set of tools for rapid application
deployment of complex workflows. 

Provides libraries of already created functionality that you can snap
into your website. 

Themes and theme management provide huge flexibility in style, feel  and
functionality.

Complete work flow pattern design system provides graphical tools to
create complex data flow logic around described data base entities.

\chapter{Work Flow Concepts}

Work Flow within a data system can primarily be described as the
activities required in accessing, maintanining and interacting with
the data base entities and managing complex activities based upon
these interactions.

JETServer Work Flow allows you to combine various Qs (queues) to
perform various activities required in supporting workflow operations.
These Qs are:

 1. Action Queue  
 2. External Queue 
 3. Decision Queue 
 4. Wait Queue 
 5. Process Queue 
 6. Event Queue
 
Each Q can have a list of associated reasons for exiting the queue and
these reasons are linked to the next queue in the flow.
Interconnecting these Qs is how work flow operations on data patterns are designed.

Action Queue (AQ)

This Q is the wrapper for the embedded work patterns and is the entry
point to initiate the work flow pattern. 

External Queue (XQ)

This Q is used to interface a view on the workflows viewpoint. First
the view is rendered to XHTML and then inserted as the innerHTML on
viewpoint. 

Within the placed data is the form for generating a POST request back
to the viewpoint's associated URL to provide the user response back to
the XQ and provide the link to the next queue based upon the resulting
user response from the XQ. 

Decision Queue (DQ)

Decision queues are basically process queues but are designed to leave
no residual actions to the data and are considered faster. The
resulting decision is returned as a path to the the next queue. 

Wait Queue (WQ)

Wait queues provide a place to `hang' a work flow unit until another
event happens or a timeout occurs. 

If an event occurs and a work flow unit is in the wait queue and the
wait queue contains a response handler for the event then the workflow 
unit will be forwarded to the linked queue for further work flow
processing.

Process Queue (PQ)

Process queues perform a function that produces a persistent result.
The resulting path can also be determined. 

Event Queue (EQ)

Send a unit to an event queue to tell all waiting work flow units in
wait queues that the event has occured and to continue processing to
the the next queue. Only wait queues that have a handler for the event
type will respond. 






XQ
Within the XQ you can request action objects that are used to link 
work flow exits. Using buttons and anchors you can progress a work
flow instance through a work flow patterns. 

These links are calls to the server using a uniquely assigned id that 
is only active for the duration of the XQ duration on the browser. As 
soon as a link is selected all links associated with the XQ are 
cancelled.

The associated work flow unit is moved through the work flow pattern 
based upon the link selected in addition to the browser's form data
being passed to the work flow unit for processing.