Service layer pattern: Difference between revisions

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{{Short description|Layered architectural pattern}}

{{One source|date=April 2010}}

'''Service layer''' is an [[Architectural pattern|architectural pattern]], applied within the [[service-orientation]] [[design paradigm]], which aims to organize the services, within a service inventory, into a set of logical layers. Services that are categorized into a particular layer share functionality. This helps to reduce the conceptual overhead related to managing the service inventory, as the services belonging to the same layer address a smaller set of activities.

==Rationale==

Grouping services into functional layers reduces the impact of change. Most changes affect only the layer in which they're made, with few side-effects that impact other layers. This fundamentally simplifies service maintenance.

The [[Service Reusability Principle|service reusability]] principle dictates that services should be designed to maximize reuse. Similarly, the [[Service Composability Principle|service composability]] principle advocates designing services so that they can be composed in various ways. Both principles require that a service contain only a specific type of logic e.g., either reusable or process-specific logic.<ref name='SOAMag'>[[Thomas Erl]].[http://soa.sys-con.com/node/645271?page=0,1 Introducing SOA Design Pattern] [Online]. Date accessed:6 April 2010.</ref> Restricting each layer to a particular functionality, simplifies the design of the service.

==Usage==

[[File:Service Layers Image A.JPG|thumb|alt=Diagram A|Diagram A<br />In the absence of any layers, services contain a mixture of different types of logic. This makes it difficult to manage these services.]]

[[File:Service Layers Image B.JPG|thumb|alt=Diagram B|Diagram B<br />A service inventory divided into layers where each layer contains the same type of logic.]]

Applying this pattern requires creating a service inventory blueprint, a list of services with associated functionality. Next, group the services into layers according to function. Adopting a common layering strategy across the enterprise facilitates reuse in other applications, because developers don't have as much to learn (or invent) when they join a project. One common layering uses task, [[Entity Abstraction Pattern|entity]] and [[Utility Abstraction Pattern|utility]].<ref name='WK'>

Wajid Khattak [http://www.informit.com/articles/article.aspx?p=1583177 Service Layers] [Online].Date accessed: 21 April 2010.</ref>

An alternative layering from Bieberstein et al.,<ref>Bieberstein. et al.[https://books.google.com/books?id=NISyExeJ5mAC&pg=PA88&dq=%22service+layer%22&lr=&hl=sv#PPA87,M1 Service-oriented Architecture Compass: Business Value, Planning, and Enterprise Roadmap].FT Press, 2005. {{ISBN|0-13-187002-5}}, {{ISBN|978-0-13-187002-4}}</ref> involves five layers, namely enterprise, process, service, component and object.

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== References ==

{{Reflist}}

* {{cite book |author-link1=Thomas Erl |last1=Erl |first1=Thomas |year=2009 |title=SOA Design Patterns |publisher=[[Prentice Hall]] |isbn=978-0-13-613516-6}}

* {{cite conference |display-authors=1 |last1=Mauro |first1=Christian |last2=Leimeister |first2=Jan Marco |last3=Krcmar |first3=Helmut |year=2010 |title=Service Oriented Device Integration - An Analysis of SOA Design Patterns |department=HICSS 2010 |work=2010 43rd Hawaii International Conference on System Sciences |pages=1–10 |doi=10.1109/HICSS.2010.336 |isbn=978-1-4244-5509-6 |issn=1530-1605 |url=https://doi.ieeecomputersociety.org/10.1109/HICSS.2010.336 |accessdate=2020-07-26|url-access=subscription }}

* [[Thomas Erl|Erl]] et al.,(2009).[https://www.amazon.com/dp/0136135161 SOA Design Patterns]. Prentice Hall. {{ISBN|0-13-613516-1}}.

* {{cite web |last1=Seshadri |first1=Srikanth |date=2007-01-17 |df=dmy |url=https://www.infoworld.com/article/2077670/logically-soa.html |title=Logically SOA |work=[[JavaWorld]] |accessdate=2020-07-26}}

* Mauro. et al. [http://www.computer.org/portal/web/csdl/doi/10.1109/HICSS.2010.336 Service Oriented Device Integration - An Analysis of SOA Design Patterns.] [Online], pp.&nbsp;1–10, 2010 43rd Hawaii International Conference on System Sciences, 2010. Date accessed: 6 April 2010.

* www.binaryspectrum.com.[{{cite web |url=http://www.binaryspectrum.com/service-oriented_architecture/soa_and_Java_2.html |title=Service-Oriented Architecture and Java - Service Layer][Online].Date accessed:|department=Technology 17|publisher=Binary AprilSpectrum 2010.|accessdate=2020-07-26}}

* Srikanth Seshadri.[http://www.javaworld.com/javaworld/jw-01-2007/jw-01-soa.html A logical architecture for SOA][Online].Date accessed: 17 April 2010.

* Norbert{{cite web |last1=Bieberstein, Keith|first1=Norbert |last2=Jones, |first2=Keith |last3=Laird |first3=Robert G. Laird,|last4=Mitra |first4=Tilak Mitra.[http|date=2008-07-17 |df=dmy |url=https://www.informit.com/articles/article.aspx?p=1194198 |title=Executing SOA: A Methodology for Service Modeling and Design] |work=[[OnlineInformIT]].Date accessed: 17 April 2010.|accessdate=2020-07-26}}

* www.binaryspectrum.com.[http://www.binaryspectrum.com/service-oriented_architecture/soa_and_Java_2.html Service-Oriented Architecture and Java - Service Layer][Online].Date accessed: 17 April 2010.

* {{cite web |url=https://collaboration.opengroup.org/projects/soa-book/pages.php?action=show&ggid=1334 |title=High-Level Perspective of the SOA RA |work=SOA Source Book |publisher=[[The Open Group]] |accessdate=2020-07-26}}

* Norbert Bieberstein, Keith Jones, Robert G. Laird, Tilak Mitra.[http://www.informit.com/articles/article.aspx?p=1194198 Executing SOA: A Methodology for Service Modeling and Design][Online].Date accessed: 17 April 2010.

* The Open Group.[http://www.opengroup.org/projects/soa-book/page.tpl?ggid=1334 High-Level Perspective of the SOA Reference Architecture][Online].Date accessed: 17 April 2010.

== External links ==

* [httphttps://wwwweb.soapatternsarchive.org/web/20201111163522/https://patterns.arcitura.com/soa-patterns SOA Design Patterns]

[[Category:Service-oriented (business computing)]]