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Sarasvati - Simple, Capable and Transparent Workflow

Reference Manual

Paul Lorenz

1.0.0

Copyright © 2008-2009 Paul Lorenz

2009-06-28

Table of Contents

1. What is workflow

Definitions

Why workflow?

Example 1: Order Fulfillment
Example 2: Document conversion

2. Why graph based workflow?

Graphs and Processes

Alternatives

3. Core Concepts

Introduction

Definitions

Sarasvati Graph Execution

Legend
Single Node
Two Nodes
Split and Join with Wait States
Multithreading
Split and Join without Wait States
Flow Control with Guards using Skip
Flow Control with Guards using Discard
Flow Control with Guards using Named Arcs
Flow Control from Node Completion using Named Arcs

Graph Composition and Nested Processes

Graph Composition Example One
Graph Composition Example Two
Nested Processes Example

Execution Environment

Process Attributes
Token Attributes

4. Using Sarasvati

Introduction

Sarasvati File Format

Introduction
Process Definition
Nodes
Node Arcs
Externals
External arcs

The Sarasvati Engine

Loading Process Definitions

Interfaces
Flow of Execution
Custom logic for Node Execution
Custom Attributes
Custom Loader
Environment
Execution Listeners
Backtracking
Process Definition Visualization
Process Visualization
Graph Validation

List of Figures

4.1. Linear Process Definition
4.2.
4.3. Manual Linear Backtracking
4.4. Manual Linear Backtracking: Execution
4.5.
4.6.
4.7.
4.8.
4.9.
4.10.
4.11. Manual Backtracking Split/Join
4.12.
4.13.
4.14.
4.15.
4.16.
4.17.
4.18.
4.19.
4.20.
4.21. Process Definition Visualization Screenshot
4.22. Process Visualization Screenshot

List of Tables

4.1. process-definition attributes
4.2. process-definition nested elements
4.3. node attributes
4.4. node nested elements
4.5. node join types
4.6. arc attributes
4.7. external attributes
4.8. external nested elements
4.9. arc attributes
4.10. Engine Implementations
4.11. Environment Attribute Types

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		Chapter 1. What is workflow