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Service Oriented Architecture An Introduction. Arnon Rotem-Gal-Oz Biometrics Line Development Manager. What is Software Architecture. What is Architecture Formal Definition. IEEE 1471-2000

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service oriented architecture an introduction

Service Oriented ArchitectureAn Introduction

Arnon Rotem-Gal-Oz

Biometrics Line Development Manager

what is architecture formal definition
What is Architecture Formal Definition
  • IEEE 1471-2000
    • Software architecture is the fundamentalorganization of a system, embodied in its components, their relationships to each other and the environment, and the principles governing its design and evolution

IEEE 1471-2000

slide4

What is Software Architecture

  • collection of the fundamental decisions about a software product/solution designed to meet the project‘s quality attributes
  • Includes the main components, their main attributes, and their collaboration
  • expressed in several levels of abstraction (depending on the project's size).
  • Architecture is communicated from multiple viewpoints
how architecture
How Architecture

Stakeholders

Quality

Attributes

Constraints

Principles

Community

experience

Architect

Architecture

Patterns &

Anti-patterns

Technology

Key

people

A “deliverable”

Produce

Is an input

what is a service 1

HMM..

What is a Service (1)
  • A facility supplying some public demand
  • the work performed by one that servesHELP, USE, BENEFIT

Merriam-Webster

what is a service 2
What is a Service (2)
  • In economics and marketing, a service is the non-material equivalent of a good. Service provision has been defined as an economic activity that does not result in ownership, and this is what differentiates it from providing physical goods.
  • It is claimed to be a process that creates benefits by facilitating either a change in customers, a change in their physical possessions, or a change in their intangible assets.

en.wikipedia.org/wiki/Service

what is a service 3
What is a service (3)
  • A Windows Service?
    • RPC Locator, EventLog, DHCP Client,
  • Software Service?
    • Distribution Service, Alert Service
    • Security Service, Log Service
  • Business Service?
    • Common Operational Picture, Navigation
    • Accounts Receivable, Customers
soa isn t a solution to world hunger
SOA isn’t a solution to world hunger

Nor is it:

  • A specific Technology
  • The Ultimate answer to reuse
  • ANew name for EAI
  • A New way to do RPC
big soa analyze the business
Big SOAAnalyze the business

BLT

ASB

AFT

TGI

FRY

ECP

HDL

SWG

DRW

MFP

WCP

QYD

DLY

SKD

DLY

XPS

WIU

KYF

XOI

ZIS

CUI

WKD

WHR

ASB

GEX

RMO

JIA

HCO

KFC

AJT

DKE

BST

VUH

FQA

big soa identify business areas
Big SOA Identify Business Areas

BLT

ASB

AFT

TGI

FRY

Navigation

ECP

Alerts

HDL

SWG

DRW

MFP

WCP

QYD

DLY

SKD

DLY

XPS

WIU

KYF

XOI

ZIS

CUI

WKD

Protectors

WHR

COP

ASB

GEX

RMO

JIA

HCO

KFC

AJT

DKE

BST

VUH

FQA

big soa map to software

COP

Nav.

Alerts

Prot.

Big SOAMap to software

"Network"

little soa
Little SOA
  • Architectural Style
  • For building distributed systems
  • Loosely coupled components
  • Our focus from here onward…
slide15

Policy

Adheres to

governed by

End Point

Binds to

Exposes

Serves

Service

Consumer

Contracts

Service

Understands

implements

describes

Key

Component

Messages

Sends/Receives

Sends/Receives

Relation

services and systems
Services and Systems
  • A service is a program you interact with via message exchanges
  • A system is a set of deployed services cooperating in a given task
slide17

A Service edge is a natural boundary

Warning: Remoting and other RPCs trick us into thinking that there is no substantial difference between a local and a remote object. In fact, they hide the presence of the network.

slide22

Policies

The fact that I can, doesn’t mean I will.

policy illustrated

Organization A

Policy

Organization B

Policy

Buyer Service

Local Service

Local Service

Policy Illustrated

Runtime contract

Policy

1. Supports X.509 Cert or Kerberos ST for AuthN

2. Supports UTF-8, UTF-16, SOAP 1.2, 1.1

Seller Service

Design time Contract

1. You’ll send a PO

2. I’ll send a confirmation

  • Runtime Contract
    • 1. Use X.509 Cert for AuthN
    • 2. Use UTF-8, SOAP 1.2

Adopted from Clemens Vasters

slide25

It’s all about the

Message, baby!

slide26

Messages

travel in

no man’s land!

slide27

Messages

Get

Retransmitted

Messages

Arrive

More than

once

Is he

Idempotent?

idempotence
Idempotence
  • Idempotent Means It’s OK to Arrive Multiple Times
    • As Long as the Request Is Processed at Least Once, the Correct Stuff Occurs
  • In Today’s Internet, You Must Design Your Requests to Be Idempotent

Naturally Idempotent

Sweeping the Floor

Idempotent

Baking a Cake

Starting fromthe ShoppingList (If MoneyDoesn’t Matter)

Not Idempotent

Withdrawing$1 Billion

Idempotent

If Haven’t Yet Done

Withdrawal #XYZfor $1 Billion,Then Withdraw$1 Billion andLabel as #XYZ

Not Idempotent

Baking a CakeStarting fromIngredients

Naturally Idempotent

Read Record “X”

Pat Helland

slide30

Request/Reply

VS

Request/Reaction

slide32

Service

Contract

slide34
Big SOA is about business alignment
  • Little SOA is an Architectural Style
    • Autonomous Coarse Grained Components
    • Message based Interactions
    • Run-Time configuration
what s next
What’s next
  • SOA Structural Patterns
  • SOA Interaction Patterns
  • UI Interaction Patterns
  • Service Composition Patterns
  • Contract Anti-patterns
  • Service Anti-patterns
  • SOA Performance Anti-Patterns