Service Orientated Architecture

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Nov 3, 2013 (3 years and 5 months ago)

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Service Orientated
Architecture

Matthew Cunliffe

© 2011 Europoint Communications Ltd

www.euro
-
point.co.uk


Who Am I?


IT Consultant and
Contractor for over 12
years


Test Manager and Technical Test Analyst


Have worked on multiple Blue Chip
contracts
including:


New Electricity Trading Arrangements (NETA)


London Congestion
Charging Scheme


Education
Maintenance Allowance
programmes

Where Do We Go From
Here?


Why and how do we
b
uild
s
oftware?



What is Service Orientated Architecture?



Implementing SOA



What are the Do’s and Don’ts of SOA?



Why Do We Build
Software?


To refresh technology


To introduce new functionality to existing
software


To save money in the long term


To improve competitiveness


… Because there is a business need

The Benefits of SOA


The ability to carry on using existing
applications


Reuse of service removes duplication


Built on open standards


Improves Quality of Service


Allows the ability to react quickly

What is Service
Orientated Architecture?


What it is!


A business approach


A collection of services


Middleware


Reusable


Loosely coupled


What it isn’t!


An off
-
the
-
shelf (COTS) product


Existing technologies bundled together


A replacement for your existing software


Any use where your systems don’t need
changing and don’t use common functionality
or need to talk to each other.

What is Service
Orientated Architecture?

What is Service
Orientated Architecture?

Sales
System

Invoicing
System

Enquiry
System

Customer
Data

Address
Validation

What is Service
Orientated Architecture?

Sales
System

Invoicing
System

Enquiry
System

Customer
Data

Address
Validation

SOA Enterprise Service Bus

Adapter

Implementing SOA


What do we mean by a service?


A service is a well
-
defined, self
-
contained
function that is independent of other services
or functions.



Implementing SOA


Web Services


XML (eXtensible Markup Language)


WSDL 2.0 (Web Services Description
Language)


SOAP (Simple Object Access Protocol)


MTOM (Message Transmission Optimisation
Mechanism)

Implementing SOA


Processing the Data


Adapters


SOA Registry and Repository


Business Process Orchestration Manager


BPM (Business Process Management)


BPEL (Business Process Execution Language
)


Service
Broker


SOA Service Manager


ESB (Enterprise Service Bus)

Implementing SOA


The Enterprise Service Bus


Is invoked by a call to a web service


Authenticates that the call is legitimate


Routes the data received to the right place


Mediates the data if necessary


Orchestrates the calling of other services if
necessary


Manages the process

Implementing SOA


The Enterprise Service Bus


Is system agnostic


Tends to use XML for transmitting data


Supports web service standards


Supports different ways of sending
information


Queues messages and processes them
according to priority


Provides Business Activity Monitoring

Implementing SOA


Create / Find
Customer Search


Customer
Data

SOA Enterprise Service Bus

Does
Customer
Exist?

Create
Customer

Retrieve

Customer

Validate
Address

Query

Customer

No

Yes

Do’s and Don’ts


Do


Collaborate with the business


Use business process


Use SOA appropriately, creating bigger,
reusable services


Use a blueprint


Implement a Test Case


Do’s and Don’ts


Don’t


Build a proprietary interface


Build a service that is too generic


Use SOA for everything


Start from scratch


Build it “because you can”

Useful Links


SOA Suppliers


IBM
SOA Foundation:
http://
www
-
01.ibm.com/software/solutions/soa/offerings.html


Progress Sonic:
http://
web.progress.com/en
-
gb/soa
-
middleware.html


Oracle SOA Suite:
http://
www.oracle.com/us/technologies/soa/index.html


SAP NetWeaver:
http
://
www.sap.com/platform/soa/index.epx


SOA
Software:
http://
www.soa.com


Web References:


Halifax IF Case Study:
http://
www.pptsearch.net/download.php?fid=412151


SOA Institute White Papers:
http://www.soainstitute.org/white
-
papers.html


W3C
Web Services:
http://www.w3.org/2007/Talks/0116
-
plh
-
hartford/#(1
)


W3C Web Open Standards and SOA:
http://www.w3.org/2008/11/dd
-
soa.html#(1
)


Wikipedia SOA:
http://
en.wikipedia.org/wiki/Service
-
oriented_architecture


Books


100 SOA Questions (Prentice Hall):
http://www.pearsoned.co.uk/bookshop/detail.asp?item=100000000387102


Enterprise
for SOA (O’Reilly):
http://oreilly.com/catalog/9780596102388


SOA For Dummies (Wiley):
http
://
eu.dummies.com/DummiesTitle/productCd
-
0470376848.html


SOA In Practice (O’Reilly):
http://
oreilly.com/catalog/9780596529550