Service Composition and Selection in Service Oriented Network Architecture (SONATE)
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Transcript of Service Composition and Selection in Service Oriented Network Architecture (SONATE)
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University of KaiserslauternDepartment of Computer ScienceIntegrated Communication Systems ICSYhttp://www.icsy.de
Service Composition and Selection in Service Oriented Network Architecture
(SONATE)
26th October 2010
M. Rahamatullah Khondoker
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2M. Rahamatullah Khondoker, University of Kaiserslautern
Outline
Motivation for SONATE Overview of SONATE Concepts and Terminologies
- Building Blocks- Workflows- Framework- Service Composition
Service Selection Conclusions and Outlook Discussion
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3M. Rahamatullah Khondoker, University of Kaiserslautern
Problem Statement
It is hard to integrate new mechanismsinto the current Internet
Because: Many implicit dependencies
(i.e. tight coupling)between existing mechanisms
The problem is not limitedto specific protocols ormechanisms
It is an architectural issue!
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4M. Rahamatullah Khondoker, University of Kaiserslautern
Motivation for SONATE
A Future Network architecture should be flexible:
- Long term flexibility: Support evolution of networks
- Short term flexibilityDynamically adapt to requirements and constraints
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5M. Rahamatullah Khondoker, University of Kaiserslautern
Long Term Flexibility
Enable: stepwise introduction of new functionality Easy introduction of new functionality without depending
on agreements with vendors / providersReasons:
- Enable utilization of highly specific or experimental functionality- Reduce time to market- Opportunity for small companies to provide (network-) services
Of course standardization is still required
Solution: Loose Coupling
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6M. Rahamatullah Khondoker, University of Kaiserslautern
Short Term Flexibility
Requirements of current application, e.g. - Different behaviour for regular and emergency phone calls
Current network constraints, e.g. - Mobile or wired network access- A Network may require authentication when prioritization is
requested Capabilities of currently involved nodes
- Adapt to supported functionality. This is important to utilize new functionality.
Solution: Dynamic Adaptation
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SONATE Concepts
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8M. Rahamatullah Khondoker, University of Kaiserslautern
Building Blocks
Functionality is provided by self-contained building blocks (BB)- Micro-protocols (e.g. flow-control, retransmission or a video
codec)- Other functionality (e.g. monitoring or lookup services)
BB have generic and well-defined interfaces
Description (XML)
BB Code
Effects,Ports,etc.
Effects,Ports,etc.
Effects,Ports,etc.
Effects,Ports,etc.
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9M. Rahamatullah Khondoker, University of Kaiserslautern
Services
A Service- Can be seen as a set of visible effects of the underlying
implementation of a protocol or mechanism - Hides implementation mechanisms
Examples of effects• Reliable transmission, Addressing, Security, Routing, Loss Detection,
Loss Reduction, Loop Avoidance, Connection Management, etc.
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10M. Rahamatullah Khondoker, University of Kaiserslautern
Workflow
Interaction of Services is defined by a workflow description- Order of Services- Possible data exchange
Descriptions can be changed easier than code Placement of a functionality is not fixed
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11M. Rahamatullah Khondoker, University of Kaiserslautern
Workflow
Interaction of Services is defined by a workflow description- Order of Services- Possible data exchange
Descriptions can be changed easier than code Placement of a functionality is not fixed
Loose coupling achieved by:
Building blocks & Workflow-Descriptions
Foster long term flexibility
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12M. Rahamatullah Khondoker, University of Kaiserslautern
SONATE Framework
Workflow processing Management of services
Repository of building blocks
Msg1 Msg2 Msg3
Timer, Events,debugging support, …
From previous node To successor node
Shared Data Structures
Physical orvirtual link
Physical orvirtual link
WorkflowEngine
ToApplication
receive send
FromApplication
Msg1’ Msg3’Msg2’
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13M. Rahamatullah Khondoker, University of Kaiserslautern
Service Composition
Create workflow descriptions- Select services to be used- Compose (connect)
services
Adapt to (current) requirements andconstraints
ServiceComposition
Application: Requirements
Network: Constraints
…
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14M. Rahamatullah Khondoker, University of Kaiserslautern
Signal Workflows
Be independent of Service Composition algorithms Intermediate nodes may
- alter workflows, i.e. act as gateways- provide feedback, i.e. request different behavior
Initiator Next Node
Msgs
FunctionalComposition
Framework FrameworkMsgs
Gateway Node
FunctionalComposition
FrameworkMsgsMsgs
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15M. Rahamatullah Khondoker, University of Kaiserslautern
Signal Workflows
Be independent of Service Composition algorithms Intermediate nodes may
- alter workflows, i.e. act as gateways- provide feedback, i.e. request different behavior
Initiator Next Node
Msgs
FunctionalComposition
Framework FrameworkMsgs
Gateway Node
FunctionalComposition
FrameworkMsgsMsgs
Dynamic adaption achieved by:
Service Composition& Processing of Workflow-Descriptions
Foster short term flexibility
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Service Selection
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17M. Rahamatullah Khondoker, University of Kaiserslautern
Service Selection
Service Composition Approaches- Manually (supported by tools)- Templates (predefined structure, delayed completion)- Genetic algorithms (automatic but time consuming process)- Compose few coarse grain modules / partial workflows- Compose fine grained building blocks
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18M. Rahamatullah Khondoker, University of Kaiserslautern
Service Selection
Composition approaches differ according to- Tradeoff: When to perform vs. Information availability
• Design time: General requirements and protocols are known• Deployment time: General application requirements and system
constraints are known• Run time: User requirements and available resources are known
- Flexibility- Effort for calculation
It is unlikely that one approach is always optimal
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19M. Rahamatullah Khondoker, University of Kaiserslautern
Service Selection Process
Application
Requirements
Conventional
TCP/IPUDP/IPSCTP/IP…
Compound Template S&C
…
ServiceBroker
Offerings
Network Abstraction API
SelectedService
Requirements
Access to Service Provider
Service Providers
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20M. Rahamatullah Khondoker, University of Kaiserslautern
Requirements: Service Selection
Service Description- For comparing application requirements and offered services
Service Selection Methodology- For getting suitable services - For getting the best service
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21M. Rahamatullah Khondoker, University of Kaiserslautern
Service Selection: Service Description
Used to determine for a requested service- Which offered services are suitable
(i.e. fulfills all compulsory requirements)- Which suitable service is optimal
(i.e. compare properties of service) Describe services using two types of properties
- Mandatory properties, attributes using absolute values• <PropID, lower-bound, upper-bound>• Examples: compare MTU size, average Bandwidth, Costs, …
- Optional properties, attributes using absolute values• <PropID, rating> rating [-9,9]• Examples: decide to increase security vs. reduce delay
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22M. Rahamatullah Khondoker, University of Kaiserslautern
Service Selection: Methodology
Service Selection Methodology- For getting an optimal service, optimization of optional properties
is required- For example, security and delay of similar services - We need Multiple Criteria Decision Analysis (MCDA)
• Several algorithms (MAUT, AHP, ELECTRE III, Evamix) exist for doing this
- Where as no other MCDA methods allow interdependence of different criteria, AHP does that
- We used Analytic Hierarchy Process (AHP)• Checking consistency of evaluation measures• Reduces biased behavior in decision making process
- AHP must be adapted for automatic service selection
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23M. Rahamatullah Khondoker, University of Kaiserslautern
Service Selection: AHP
Fig. Analytic Hierarchy Process (AHP)
Absolutely More
Absolutely Less
9753-1 or 1-3-5-7-9
Moderately Less
Moderately MoreEqual
Fig. Pairwise comparison scale
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24M. Rahamatullah Khondoker, University of Kaiserslautern
Service Selection: Usage of AHP
AHP in service description and selection- Input
• A set of effects- Requirements
• Pairwise priority assignment• Calculate one priority for each effect
- Offers• Pairwise priority assignment
- This requires a mapping mechanism which cannot be done by AHP• Calculate one priority for each effect
- Output• A service with the highest priority value
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25M. Rahamatullah Khondoker, University of Kaiserslautern
Service Selection
The priority assigned in requirements needs to be mapped to the offered services
Pairwise prioritization of services per effect- The mapping must be generic- The mapping should be monotonic- A linear mapping of measured values to prioritization is not
adequate- An approach for mapping is proposed to use monotonic
interpolation/extrapolation
+/- 1
9
-9
Hints Measured value
Measured value of offers
Prio
rity
Fig. Values in terms of hints
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26M. Rahamatullah Khondoker, University of Kaiserslautern
Example: AHP in Service Selection
Offerings
Application Requirements
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27M. Rahamatullah Khondoker, University of Kaiserslautern
Summary and Outlook
Summary- SONATE as a flexible network architecture- Service Description- Service Selection
• Analytic Hierarchy Process (AHP)
Outlook- Service Composition Challenges
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Thanks for your attention
Any questions, comments or concerns?
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29M. Rahamatullah Khondoker, University of Kaiserslautern
Discussion Questions?
Assuming that more than one services provide the same functionality. In that case, we need mechanisms for rating those services to select the most appropriate one.
- How to do rating of composed services?
• Which time is suitable for rating a composed service Design time, deployment time or runtime?
• Do we have enough information to aggregate properties at that time? For example, delay and security of a service
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30M. Rahamatullah Khondoker, University of Kaiserslautern
Discussion Questions?
Assuming that a service, Reliable transmission, can be offered as a coarse-grained service or it can also be offered by following services- Error detection- Order preservation- Error control- Data flow limiting
- Which grained of service is better? Coarse-grained or fine-grained. Why?
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31M. Rahamatullah Khondoker, University of Kaiserslautern
Discussion Questions?
Services might be dependent on each other. These dependency information can be written statically or can be obtained dynamically by analysing their semantics.
- Which way of obtaining dependency is better? Why? What properties to be in the service description so that dependency information can be obtained automatically?
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32M. Rahamatullah Khondoker, University of Kaiserslautern
Discussion Questions?
Where to place services? End-to-end, every node, or in the middle boxes?
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33M. Rahamatullah Khondoker, University of Kaiserslautern
Discussion Questions?
How to deal with heterogeneous services?
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Integrated Communication Systems ICSY
University of KaiserslauternDepartment of Computer ScienceP.O. Box 3049D-67653 Kaiserslautern
M. Rahamatullah Khondoker, M.Sc.
Phone: +49 (0)631 205-26 43Fax: +49 (0)631 205-30 56
Email: [email protected]: http://www.icsy.de
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35M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 1
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
The Analytical Hierarchy Process by Thomas Saaty
A.Car A Car B Car C
Price 13100 11200 9500MPG 18 23 29
Interior Deluxe Above Average StandardBody 4-Door Mid-size 2-Door Sport 2-door compactRadio AM/FM, tape AM/FM AM
Engine 6-cylinder 4-cylinder turbo 4-cylinder
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36M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 2
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
B. Hierarchy of Decisions
Select the best car
Price MPG Comfort Style
Car ACar BCar C
Car ACar BCar C
Car ACar BCar C
Car ACar BCar C
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37M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 3
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
C. Establish Priorities
1. The priorities of the four criteria in terms of the overall goal.2. The priorities of the three cars in terms of the purchase-price criterion.3. The priorities of the three cars in terms of the MPG criterion.4. The priorities of the three cars in terms of the comfort criterion.5. The priorities of the three cars in terms of the style criterion.
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38M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 4
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
D. Pairwise Comparison Scale
Verbal Judgement of Preference Numerical RatingExtremely Preferred 9
Very strong to extremely 8Very strongly preferred 7
Strongly to very strongly 6Strongly preferred 5
Moderately to strongly 4Moderately preferred 3
Equally to moderately 2Equally preferred 1
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39M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 5
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
E. Pairwise comparison matrix showing preferences for the three cars in terms of comfort
Comfort Car A Car B Car CCar A 1 2 8Car B 0,5 1 6Car C 0,125 0,166666667 1
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40M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 6
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
F. Synthesizing JudgmentsComfort Car A Car B Car CCar A 1 2 8Car B 0,5 1 6 Sum the columns in the pairwise comparison matrix.Car C 0,125 0,166666667 1
1,625 3,166666667 15
Comfort Car A Car B Car CCar A 0,615384615 0,631578947 0,533333Car B 0,307692308 0,315789474 0,4 Divide elements by the column totals.Car C 0,076923077 0,052631579 0,066667
1 1 1
Priority Vector for ComfortComfort Car A Car B Car CCar A 0,615384615 0,631578947 0,533333 0,593432Car B 0,307692308 0,315789474 0,4 0,341161 Sum the rows.Car C 0,076923077 0,052631579 0,066667 0,065407
Car A 0,593Car B 0,341 The priority vector for the cars with respect to comfort.Car C 0,065
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41M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 7
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
G. Other Pairwise ComparisonsPrice Car A Car B Car C Priority VectorsCar A 1 0,33333333 0,25 0,123Car B 3 1 0,5 0,32Car C 4 2 1 0,557
MPG Car A Car B Car CCar A 1 0,25 0,166667 0,087Car B 4 1 0,333333 0,274Car C 6 3 1 0,639
Style Car A Car B Car CCar A 1 0,33333333 4 0,265Car B 3 1 7 0,655Car C 0,25 0,142857143 1 0,08
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42M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 8
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
H. Pairwise comparison matrix for the four criteria in the car selection problem.Criterion Price MPG Comfort StylePrice 1 3 2 2MPG 0,333333333 1 0,25 0,25Comfort 0,5 4 1 0,5Style 0,5 4 2 1
I. Priorities for the overall goal.Price 0,398MPG 0,085Comfort 0,218Style 0,299
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43M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 9
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
J. Developing an overall priority ranking.Criterion Price MPG Comfort Style
Car A 0,123 0,087 0,593 0,265 Alternative Car B 0,32 0,274 0,341 0,655
Car C 0,557 0,639 0,065 0,08
Overall car A priority = .398(0.123)+0.085(0.087)+).218(0.593)+0.299(0.265)=.265Overall car B priority = .398(0.320)+0.085(0.274)+).218(0.341)+0.299(0.655)=.421Overall car C priority = .398(0.557)+0.085(0.639)+).218(0.066)+0.299(0.080)=.314
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44M. Rahamatullah Khondoker, University of Kaiserslautern
Analytic Hierarchy Process (AHP): step 10
Ref: This example is taken from the slides of Dr. S. Tom Foster, Jr. and Dr. Gerald LaCava
K. Final AHP Ranking of Alternatives
Car B 0,421Car C 0,314Car A 0,265
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