esoa: a contextual analysis on service oriented architecture for embeddded networks

eSOA: Service Oriented Architecture for embedded

networks(Software Systems Methodological Foundations)

Master in Software Engineering & Artificial Intelligence

eSOA: eSOA: SService ervice OOriented riented AArchitecture for rchitecture for eembedded mbedded

networksnetworks(Software Systems Methodological Foundations)(Software Systems Methodological Foundations)

Master in Software Engineering & Artificial IntelligenceMaster in Software Engineering & Artificial Intelligence

Computer Science DepartmentUniversity of Malaga

Juan Antonio Martin Checa2011



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“Before God we are all equally wise -and equally foolish.”

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“Before God we are all equally wise -and equally foolish.”

-Albert Einstein

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You might be wondering...You might be wondering...You might be wondering...

What is this about?

What is this about?

eSOA: Service Oriented Architecture for Embedded NetworkseSOA: Service Oriented Architecture for Embedded Networks

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Index of contentsIndex of contentsIndex of contents

1. Introduction2. SOA (Service-Oriented Architecture)

3. eSOA (SOA for Embedded Systems)

4. Related Work5. Future Work6. Conclusions

1. Introduction2. SOA (Service-Oriented Architecture)

3. eSOA (SOA for Embedded Systems)

4. Related Work5. Future Work6. Conclusions


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1. Introduction1. Introduction1. Introduction

1.1 The Internet of Things (IoT)

1.2 The Internet of Services (IoS)

1.3 Services

1.4 WSDL (Web Services Description Language)

1.5 SOAP (Simple Object Access Protocol)

1.1 The Internet of Things (IoT)

1.2 The Internet of Services (IoS)

1.3 Services

1.4 WSDL (Web Services Description Language)

1.5 SOAP (Simple Object Access Protocol)

1. Introduction 1. Introduction 2. SOA 3. eSOA 4. Related Work 5. Future 2. SOA 3. eSOA 4. Related Work 5. Future Work 6. ConclusionsWork 6. Conclusions


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1.1 The Internet of Things (IoT)1.1 The Internet of Things (IoT)1.1 The Internet of Things (IoT)

“self-configuring wireless network of sensors which purpose would be to interconnect all things”

“self-configuring wireless network of sensors which purpose would be to interconnect all things”



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1.1 The Internet of Things (IoT)1.1 The Internet of Things (IoT)1.1 The Internet of Things (IoT)

every single object unique ID device (radio tag)IPv6 2128 addressestime no common / linear dimensionmanagement of massive parallel IT systems

ambient intelligence own / shared goals

every single object unique ID device (radio tag)IPv6 2128 addressestime no common / linear dimensionmanagement of massive parallel IT systems

ambient intelligence own / shared goals



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1.2 The Internet of Services (IoS)1.2 The Internet of Services (IoS)1.2 The Internet of Services (IoS)

“next-generation of the services revolution”

“next-generation of the services revolution”



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“a new business model that can radically change the way we discover and invoke services“

“a new business model that can radically change the way we discover and invoke services“



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“worldwide, trusted service ecosystem of service providers, consumers, and brokers, buying, selling, repurposing, and composing services for different needs resulting in a new way of organizing the interaction between partner ecosystems and customer base”

“worldwide, trusted service ecosystem of service providers, consumers, and brokers, buying, selling, repurposing, and composing services for different needs resulting in a new way of organizing the interaction between partner ecosystems and customer base”



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1.3 Services1.3 Services1.3 Services

Types of ServiceBusiness Servicee-ServiceWeb Service (WS)

Types of ServiceBusiness Servicee-ServiceWeb Service (WS)



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Lifecycle of Services: Discovery, Invocation, & Execution

Lifecycle of Services: Discovery, Invocation, & Execution



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Atomic Vs Composite Services

Atomic Service: provides a basic functionality

Composite Service: +2 atomic/composite services

(superior functionality)

Atomic Vs Composite Services

Atomic Service: provides a basic functionality

Composite Service: +2 atomic/composite services

(superior functionality)



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WS 1st-Generation WS Platform

WDSL (Web Services Description Language)XSD (XML Schema Definition Language)SOAP (Simple Object Access Protocol) UDDI (Universal Description Discovery & Integration)WS-I Basic Profile

WS 1st-Generation WS Platform

WDSL (Web Services Description Language)XSD (XML Schema Definition Language)SOAP (Simple Object Access Protocol) UDDI (Universal Description Discovery & Integration)WS-I Basic Profile



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WSWS



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WS 2nd-Generation WS PlatformWS-Security (and WS-SX) WS-CoordinationWS-AtomicTransactionWS-BusinessActivity (and WS-TX) WS-ReliableMessaging (and WS-RX) WS-Policy WS-Addressing

WS 2nd-Generation WS PlatformWS-Security (and WS-SX) WS-CoordinationWS-AtomicTransactionWS-BusinessActivity (and WS-TX) WS-ReliableMessaging (and WS-RX) WS-Policy WS-Addressing



(WS- extensions)

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1.4 WSDL (Web Services Description Language)1.4 WSDL 1.4 WSDL (Web Services Description Language)(Web Services Description Language)

XML-based language

“model for describing WS ...as a collection of related endpoints

(ports)”

XML-based language

“model for describing WS ...as a collection of related endpoints

(ports)”



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1.4 WSDL (Web Services Description Language)1.4 WSDL 1.4 WSDL (Web Services Description Language)(Web Services Description Language)



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1.5 SOAP (Simple Object Access Protocol)1.5 SOAP 1.5 SOAP (Simple Object Access Protocol)(Simple Object Access Protocol)

XML-based protocol

“lightweight protocol intended for exchanging structured information in a decentralized, distributed environment”

XML-based protocol

“lightweight protocol intended for exchanging structured information in a decentralized, distributed environment”



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1.5 SOAP (Simple Object Access Protocol)1.5 SOAP 1.5 SOAP (Simple Object Access Protocol)(Simple Object Access Protocol)



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OK, so... What is

SOA?

OK, so... What is

SOA?eSOA: Service Oriented Architecture for Embedded NetworkseSOA: Service Oriented Architecture for Embedded Networks

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2. SOA2. SOA2. SOA

2.1. Overview2.2. Fundamental Design Terms2.3. Service-Oriented Computing2.4. Service-Oriented Architecture

(SOA)

2.1. Overview2.2. Fundamental Design Terms2.3. Service-Oriented Computing2.4. Service-Oriented Architecture

(SOA)


1. Introduction1. Introduction 2. SOA 2. SOA 3. eSOA 4. Related Work 5. Future Work 3. eSOA 4. Related Work 5. Future Work 6. Conclusions6. Conclusions

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2.1 Overview2.1 Overview2.1 Overview

SOA“a paradigm for organizing and utilizing distributed

capabilities that may be under the control of different ownership domains.[...] It provides a uniform means to offer, discover, interact with and use capabilities to produce desired effects consistent with measurable preconditions and expectations.”

- OASIS (Organization for the Advancement of Structured Information Standard)

SOA“a paradigm for organizing and utilizing distributed

capabilities that may be under the control of different ownership domains.[...] It provides a uniform means to offer, discover, interact with and use capabilities to produce desired effects consistent with measurable preconditions and expectations.”

- OASIS (Organization for the Advancement of Structured Information Standard)



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2.2 Fundamental Design Terms2.2 2.2 Fundamental Design TermsFundamental Design Terms



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2.3 Service-Oriented Computing (SOC)2.3 2.3 ServiceService--Oriented Computing Oriented Computing (SOC)(SOC)

SOC“a new generation distributed computing platform

characterized by its distinct architectural model, design paradigm, and design principles, that includes design pattern catalogs, pattern languages, as well as related concepts, technologies, and frameworks.”

SOC“a new generation distributed computing platform

characterized by its distinct architectural model, design paradigm, and design principles, that includes design pattern catalogs, pattern languages, as well as related concepts, technologies, and frameworks.”



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2.3 Service-Oriented Computing (SOC)2.3 2.3 ServiceService--Oriented Computing Oriented Computing (SOC)(SOC)

SOC Goals & BenefitsIncreased Intrinsic InteroperabilityIncreased Organizational AgilityIncreased Business-Technology AlignmentIncreased FederationIncreased Vendor DiversificationIncreased ROIReduced IT Burden

SOC Goals & BenefitsIncreased Intrinsic InteroperabilityIncreased Organizational AgilityIncreased Business-Technology AlignmentIncreased FederationIncreased Vendor DiversificationIncreased ROIReduced IT Burden



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2.4 Service-Oriented Architecture (SOA)2.4 2.4 ServiceService--Oriented ArchitectureOriented Architecture (SOA)(SOA)

SOA ElementsSOA Elements



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2.4 Service-Oriented Architecture (SOA)2.4 2.4 ServiceService--Oriented ArchitectureOriented Architecture (SOA)(SOA)

SOA Principles1. Standardized Service Contract2. Service Loose Coupling3. Service Abstraction4. Service Reusability5. Service Autonomy6. Service Statelessness7. Service Discoverability8. Service Composability9. Service Optimization10. Service Relevance11. Service Encapsulation

SOA Principles1. Standardized Service Contract2. Service Loose Coupling3. Service Abstraction4. Service Reusability5. Service Autonomy6. Service Statelessness7. Service Discoverability8. Service Composability9. Service Optimization10. Service Relevance11. Service Encapsulation



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A-ha! I know about SOA,

but... what is e-SOA?

A-ha! I know about SOA,

but... what is e-SOA?


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3. eSOA3. eSOA3. eSOA

3.1. Overview3.2. Embedded Networks Requirements 3.3. eSOA3.4. eSOA Middleware Design Principles3.5. eSOA Middleware Implementation3.6. eSOA Middleware Example: Smart

Home

3.1. Overview3.2. Embedded Networks Requirements 3.3. eSOA3.4. eSOA Middleware Design Principles3.5. eSOA Middleware Implementation3.6. eSOA Middleware Example: Smart

Home


1. Introduction1. Introduction 2. SOA 2. SOA 3. eSOA3. eSOA 4. Related Work 5. Future Work 6. Conclu4. Related Work 5. Future Work 6. Conclusionssions

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3.1 Overview3.1 Overview3.1 Overview

Past: isolated embedded systems Nowadays: connect & integrate daily-life

devices into distributed embeddednetworks

SOA: the most extended/widely adopted strategy for implementing complex, heterogeneous, and large IT systems worldwide (based on WS)

Connecting WS-embedded devices: essential

Past: isolated embedded systems Nowadays: connect & integrate daily-life

devices into distributed embeddednetworks

SOA: the most extended/widely adopted strategy for implementing complex, heterogeneous, and large IT systems worldwide (based on WS)

Connecting WS-embedded devices: essential



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3.2. Embedded Networks Requirements3.2. 3.2. Embedded Networks RequirementsEmbedded Networks Requirements

1. Heterogeneity2. Distributed Architecture3. Reconfigurable Architecture4. Resource Limitations5. Scalable Functionality6. Error Detection and Recovery7. End-User Programming8. Bridging

1. Heterogeneity2. Distributed Architecture3. Reconfigurable Architecture4. Resource Limitations5. Scalable Functionality6. Error Detection and Recovery7. End-User Programming8. Bridging



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3.3. eSOA3.3. 3.3. eSOAeSOA

KEY IDEAS:

SOA is pretty good.

If SOA is so good, why not taking advantage of it for embedded networks?

KEY IDEAS:

SOA is pretty good.

If SOA is so good, why not taking advantage of it for embedded networks?



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3.3. eSOA3.3. 3.3. eSOAeSOA

PROBLEM:

SOA cannot be applied directly to embedded networks

PROBLEM:

SOA cannot be applied directly to embedded networks



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WS-world e-worldWS-world e-world

eSOA

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WS-world e-worldWS-world e-world

eSOArequest-response messagesWS instances not sharedrobust hw infrastructures

data-driven messagese-services states sharedhw constraints (CPU, mem)

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3.4. eSOA Middleware Design Principles3.4. 3.4. eSOA Middleware Design PrincipleseSOA Middleware Design Principles

Embedded Networks Layers ArchitectureEmbedded Networks Layers Architecture



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3.5. eSOA Middleware Implementation3.5. 3.5. eSOA Middleware ImplementationeSOA Middleware Implementation

“the result of [the] code generation [...] is an optimized, tailored middleware with embeddedand already configured services that implement the application logic. The main task of the middleware is to connect the different servicesinvolved independent[ly] of their location (local or remote).”

- Sholz, A , Gapanova, I., Sommer, S., Buckl, C.

“the result of [the] code generation [...] is an optimized, tailored middleware with embeddedand already configured services that implement the application logic. The main task of the middleware is to connect the different servicesinvolved independent[ly] of their location (local or remote).”

- Sholz, A , Gapanova, I., Sommer, S., Buckl, C.



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Network ArchitectureNetwork Architecture



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Features

1. Efficient Distributed Data Processing

2. Metadata-Aided Service Composition

3. Run-Time Adaptability

4. Integration with External Services

Features




4. Integration with External ServiceseSOA: Service Oriented Architecture for Embedded NetworkseSOA: Service Oriented Architecture for Embedded Networks


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Efficient Platform-Specific Code GenerationEvent-Based Data ProcessingDistributed Execution of Applications





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Node Architecture


Node Architecture


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2. Metadata-Aided Service CompositionEnd-user Programming

average non-expert users: application (no implementation)- chose the most suitable application pattern (repository)- assign hw services to slots defined by the selected pattern- select logic services

experienced users:- develop their own application patterns

programmers:- develop logic services

2. Metadata-Aided Service CompositionEnd-user Programming

average non-expert users: application (no implementation)- chose the most suitable application pattern (repository)- assign hw services to slots defined by the selected pattern- select logic services

experienced users:- develop their own application patterns

programmers:- develop logic services



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(Semi-) Automatic Service Composition

Case: subnets of identical / similar structure(re-)configuration of every single subnet: tedious

Solution: application patterns automation- changes easily propagable between installations based on the same

application pattern- application patterns easily inferred (by inspecting available services)

suggestions for new installations


(Semi-) Automatic Service Composition

Case: subnets of identical / similar structure(re-)configuration of every single subnet: tedious

Solution: application patterns automation- changes easily propagable between installations based on the same

application pattern- application patterns easily inferred (by inspecting available services)

suggestions for new installations



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Embedded networks: frequently dynamic- Nodes: new, reconfigured, unavailable,

removed, mobile- Node failures: Local Vs Global recovery

Local: redundant eServices / com. channelsGlobal: switching targeted application

- Node adaptation: to new applications


Embedded networks: frequently dynamic- Nodes: new, reconfigured, unavailable,

removed, mobile- Node failures: Local Vs Global recovery

Local: redundant eServices / com. channelsGlobal: switching targeted application

- Node adaptation: to new applications



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Interaction Schemes

IP-compatible Addressing

Service Bridge


Interaction Schemes

IP-compatible Addressing

Service Bridge



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4. Integration with External Services4. Integration with External Services



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4. Integration with External ServicesInteraction Schemes

1. Continuous Interaction with the eNetwork2. Ad-hoc Interaction with the eNetwork3. Continuous Interaction with external WS4. Ad-hoc Interaction with external WS

4. Integration with External ServicesInteraction Schemes

1. Continuous Interaction with the eNetwork2. Ad-hoc Interaction with the eNetwork3. Continuous Interaction with external WS4. Ad-hoc Interaction with external WS



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4. Integration with External ServicesInteraction SchemesContinuous Interaction with the eNetwork- Subscriptions

low communication overhead support of non-periodic interactionsmanaged by WS-Eventing, etc.

4. Integration with External ServicesInteraction SchemesContinuous Interaction with the eNetwork- Subscriptions

low communication overhead support of non-periodic interactionsmanaged by WS-Eventing, etc.



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4. Integration with External ServicesInteraction SchemesAd-hoc Interaction with the eNetwork

- RPC-style WS invocations- RPC (Remote Procedure Call)- not planned beforehand

Client RPC call (+data) Serverprocess data

response

4. Integration with External ServicesInteraction SchemesAd-hoc Interaction with the eNetwork

- RPC-style WS invocations- RPC (Remote Procedure Call)- not planned beforehand

Client RPC call (+data) Serverprocess data

response



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4. Integration with External ServicesInteraction SchemesContinuous Interaction with external WS- Stream-based paradigm (embedded network)

necessity of retrieving / sending datafrom/to an external WS on a periodic basis

4. Integration with External ServicesInteraction SchemesContinuous Interaction with external WS- Stream-based paradigm (embedded network)

necessity of retrieving / sending datafrom/to an external WS on a periodic basis



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4. Integration with External ServicesInteraction SchemesAd-hoc Interaction with external WSnot necessary not contemplatedeServices have no knowledge about the

specific wiring reconfigurations of applications are only triggered by WS end-users or the middleware itself, but never by eServices.

4. Integration with External ServicesInteraction SchemesAd-hoc Interaction with external WSnot necessary not contemplatedeServices have no knowledge about the

specific wiring reconfigurations of applications are only triggered by WS end-users or the middleware itself, but never by eServices.



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4. Integration with External ServicesIP-compatible Addressingall the devices in eSOA have an IP addressService Bridge:- monitors all incoming messages at Network Layer- translates messages into the suitable packet format- forwards messages to the targeted eService

4. Integration with External ServicesIP-compatible Addressingall the devices in eSOA have an IP addressService Bridge:- monitors all incoming messages at Network Layer- translates messages into the suitable packet format- forwards messages to the targeted eService



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4. Integration with External ServicesIP-compatible Addressing4. Integration with External ServicesIP-compatible Addressing



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3.6. eSOA Middleware Example: Smart Home3.6. 3.6. eSOA Middleware Example: eSOA Middleware Example: Smart HomeSmart Home



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Oh! I think I got it!but... where does

e-SOA fits?

Oh! I think I got it!but... where does

e-SOA fits?eSOA: Service Oriented Architecture for Embedded NetworkseSOA: Service Oriented Architecture for Embedded Networks

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4. Related Work4. Related Work4. Related Work


1. Introduction1. Introduction 2. SOA 3. eSOA 2. SOA 3. eSOA 4. Related Work4. Related Work 5. Future Work 6. Conclusions5. Future Work 6. Conclusions

CougarTinyDB

M O R ERUNES

KNX

S-O-C-R-A-D-E-S

SIRENA

AUTOSAR

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5. Future Work5. Future Work5. Future Work

- Improve application execution (data stream management tech)

- Evaluate different service placement strategies

- Automatic learning of service patterns (repository of apps)

- Application level connectivity at the routing layer routing optimization, low overhead (protocols / routing tables)

- Enrichment of the semantic descriptions of services select the most suitable service (service repository)

- Interface for discovery / integration of field-level devices & WSUDDI registries / query interfaces (TinyDB)

- Improve application execution (data stream management tech)

- Evaluate different service placement strategies

- Automatic learning of service patterns (repository of apps)

- Application level connectivity at the routing layer routing optimization, low overhead (protocols / routing tables)

- Enrichment of the semantic descriptions of services select the most suitable service (service repository)

- Interface for discovery / integration of field-level devices & WSUDDI registries / query interfaces (TinyDB)


1. Introduction1. Introduction 2. SOA 3. eSOA 4. Related Work 2. SOA 3. eSOA 4. Related Work 5. Future Work5. Future Work 6. Conclusions6. Conclusions

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6. Conclusions6. Conclusions6. Conclusions

Internet of Things

connect / integrate daily-life devices into distributed embedded networks

connect WS & embedded devices

Internet of Things

connect / integrate daily-life devices into distributed embedded networks

connect WS & embedded devices


1. Introduction1. Introduction 2. SOA 3. eSOA 4. Related Work 5. Future 2. SOA 3. eSOA 4. Related Work 5. Future Work Work 6. Conclusions6. Conclusions

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Service-Oriented Architecture (SOA)

most extended and widely adopted strategy for implementing complex, heterogeneous, and large IT systems


most extended and widely adopted strategy for implementing complex, heterogeneous, and large IT systems



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Service: contract, loose coupling, abstraction, reusability, autonomy, statelessness, discoverability, composability, optimization, relevance & encapsulation

Web Services (WS)


Service: contract, loose coupling, abstraction, reusability, autonomy, statelessness, discoverability, composability, optimization, relevance & encapsulation

Web Services (WS)



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Embedded Networks

heterogeneity, distributed / reconfigurable architecture, resource limitations, scalable functionality, error detection & recovery, end-user programming, and bridging

eServices

Embedded Networks

heterogeneity, distributed / reconfigurable architecture, resource limitations, scalable functionality, error detection & recovery, end-user programming, and bridging

eServices



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SOA Vs Embedded Networks

SOA not applicable directly to eNetworks

need for intermediary eSOA

SOA Vs Embedded Networks

SOA not applicable directly to eNetworks

need for intermediary eSOA



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SOA architecture

Application Layer

Service Layer

Abstract Infrastructure Layer

SOA architecture

Application Layer

Service Layer

Abstract Infrastructure Layer



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SOA middleware

Efficient Distributed Data Processing

Metadata-Aided Service Composition

Run-Time Adaptability

Integration with External Services

SOA middleware

Efficient Distributed Data Processing

Metadata-Aided Service Composition

Run-Time Adaptability

Integration with External ServiceseSOA: Service Oriented Architecture for Embedded NetworkseSOA: Service Oriented Architecture for Embedded Networks


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You might be thinking...You might be thinking...You might be thinking...

Now you can impress your friends talking

about SOA ...please, ask!

Now you can impress your friends talking

about SOA ...please, ask!


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T h o m a s E r l

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“By learning you will teach, by teaching

you will learn.”

“You see things; and you say, 'Why?' But I dream things that never were; and I say, ‘Why not?’”

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“By learning you will teach, by teaching

you will learn.”- Latin Proverb

“You see things; and you say, 'Why?' But I dream things that never were; and I say, ‘Why not?’”

- George Bernard Shaw

eSOA: Service Oriented Architecture for embedded

networks(Software Systems Methodological Foundations)

Master in Software Engineering & Artificial Intelligence

eSOA: eSOA: SService ervice OOriented riented AArchitecture for rchitecture for eembedded mbedded

networksnetworks(Software Systems Methodological Foundations)(Software Systems Methodological Foundations)

Master in Software Engineering & Artificial IntelligenceMaster in Software Engineering & Artificial Intelligence



