Enabling Workflow in UPnP Networks Andreas BobekUniversity of Rostock Faculty of Computer Science...

Enabling Workflow in UPnP Networks

Andreas BobekUniversity of Rostock

Faculty of Computer Science and Electrical Engineering

Andreas Bobek, Hendrik Bohn, Frank GolatowskiUniversity of Rostock


Gerd Kachel, Andreas Spreenkachel GmbH

3rd International IEEE Conference onIndustrial Informatics

INDIN´0510th – 12th August, 2005, Perth, Australia


University of Rostock


Outline


1. Workflow

2. UPnP

3. UPnP Plug-In for Workflow Management System

4. Workflow Management System as UPnP Device

5. Scenario

6. Conclusions

Andreas Bobek

Slide 1 of 19




"The term workflow refers to the automation of a business process, in whole or part, during which

documents, information or tasks are passed from one participant to another for action, according to a set of

procedural rules." (The Workflow Management Coalition Specification)

1. Workflow

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receiving book order fax

transfer order data to IT system

wait for book availability in store

wait for receipt of payment

instruction to shipment

packing & shipping

And-Split

And-Join

1. Workflow - Example

Activity

Control Node

Andreas Bobek

Slide 3 of 19




activities & control nodes

XPDL(XML Process Definition

Language)

generates

interpreted by

invoke invoke

Plug-Ins

Workflow Engine(s)

Process Definitions

Administration & Monitoring Tools

Client Applications

App App App

Process Definition & Modeler Tools

Supervisor

Developer

User

1. Workflow - Workflow Reference Model

Andreas Bobek

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- process definition

- definition of a business process (XML Process Definition Language = XPDL)

- Workflow Management System

- container for workflow engines, process definitions and connectors to external applications or systems (e.g. plug-ins)

- creates workflow instances of process definitions at runtime

- workflow engine

- executes processes according to their definition

- interacts with other engines, with users and external applications

1. Workflow

Andreas Bobek

Slide 5 of 19




- UPnP = Universal Plug and Play

- supports ad-hoc networking of devices and services

- only protocols are defined (UDP, TCP, SOAP, SSDP, GENA, HTTP)

- independent of programming language, operating system and transmission medium

- six phases: addressing, discovery, description, control, eventing, and presentation

- defines two communicating components: device (+ service), control point

2. UPnP

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- offers services (device is a server)

- may contain other devices

- characterized by properties such as model number, model name, vendor...

- uniquely identifiable by UUID

2. UPnP - Components

- interface to the device

- offers actions and URLs for controlling, eventing, and presentation

- manages its state in state variables

device

service

control point- searches for devices and/or services

- invokes actions (control point is a client)

Andreas Bobek

Slide 7 of 19




UPnP network

DS

S

D

S

S

SD

S

S

S D

S

CP

CP

control point

D

S

CP

device

service

2. UPnP - Components

Andreas Bobek

Slide 8 of 19



IP

UDP TCP

HTTPHTTPU HTTPMU

SOAPSSDP GENA

UPnP Device Architecture(Addressing, Discovery, Description, Control, Eventing,

Presentation)

Standardized DCPs(by UPnP Forum)

UPnP Stack


Andreas Bobek

Slide 9 of 19




1. enriching workflow management systems with UPnP capabilities

2. enriching UPnP networks by integrating workflow management systems as UPnP devices

Possibilities of integration

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Language)

generates

interpreted by

invoke invoke

Plug-Ins

Workflow Engine(s)

Process Definitions


Client Applications

App App App


Supervisor

Developer

User


Andreas Bobek

Slide 11 of 19






Language)

generates

interpreted by

invoke invoke

Plug-Ins

Workflow Engine(s)

Process Definitions


Client Applications

App App App

UPnPControl Point

S

Dev Dev

S S


Supervisor

Developer

User


Andreas Bobek

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WorkflowManagementSystem

UPnP network

CP

DS

S

D

S

S

SD

S

S

S D

S

Plug-Ins

Workflow Engine(s)

Process Definitions

AppAppApp

CP

CP

- consider UPnP network as external applications

- usual way to access external applications is via plug-ins

- plug-in for UPnP networks is an UPnP Control Point


Andreas Bobek

Slide 13 of 19




WorkflowManagementSystem

UPnP network

CP

DS

S

D

S

S

SD

S

S

S D

S

Plug-Ins

Workflow Engine(s)

Process Definitions

AppAppApp

CP

CP

UPnPWorkflowDevice

D

S

4. Workflow Management System as UPnP Device

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IP

UDP TCP

HTTPHTTPU HTTPMU

SOAPSSDP GENA


Presentation)


UPnP Stack


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IP

UDP TCP

HTTPHTTPU HTTPMU

SOAPSSDP GENA


Presentation)


WMS Device

Lighting Controls

Printer Device

Internet Gateway Device

1.2. UPnP Stack


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WMSDevice

Workflow ControlService

Process Definition Service

start, run, stop, status, result

register, unregister

Workflow Management System as UPnP Device

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5. Scenario

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5. Scenario

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runSlideShow(imageURIs, mediaRendererUUID, delay)



Andreas Bobek

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6. Conclusions

- Workflow – appropriate solution for automatic control of devices

- reusability of workflow tools (modeler, monitoring...) in UPnP networks and reusability of execution engines

- Workflow Management System for managing UPnP networks (monitoring and controlling)

- UPnP as a further interface for installing, running and controlling workflow processes

- business processes (applications) => technical processes (+devices)

- devices replaceable during runtime

Enabling Workflow in UPnP Networks Andreas BobekUniversity of Rostock Faculty of Computer Science...

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