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S90-01 - Fundamental SOA & Service-Oriented Computing - Dump Information

Vendor : SOA
Exam Code : S90-01
Exam Name : Fundamental SOA & Service-Oriented Computing
Questions and Answers : 76 Q & A
Updated On : February 15, 2019
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S90-01 Questions and Answers

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S90-01 Fundamental SOA & Service-Oriented Computing

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S90-01 exam Dumps Source : Fundamental SOA & Service-Oriented Computing

Test Code : S90-01
Test Name : Fundamental SOA & Service-Oriented Computing
Vendor Name : SOA
Q&A : 76 Real Questions

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SOA Fundamental SOA

The fundamental ameliorations between microservices and SOA | killexams.com Real Questions and Pass4sure dumps

for a lot of architects and developers, provider-oriented architecture is the software model they are most experienced...

with. but it's viable that management will demand a shift to microservices. As such, SOA builders should be mindful the alterations between microservices and SOA and the way to make the transition from the monolith as clean as viable.

Core concepts in microservices and SOA

There have all the time been two dimensions to the concept of SOA. on the conceptual stage, SOA is a mannequin for constructing functions by assembling accessories that can be shared among functions and hosted independently. on the implementation level, SOA developed a series of specifications to outline utility qualities and interfaces, broker access and supply safety, together with simple Object entry Protocol and web services Description Language.

many of SOA's underlying ideas are also core ideas in microservices. besides the fact that children, microservices follow these concepts in the course of the lens of the cyber web, the net and leisure interfaces.

essentially every construction group is well-known with relaxation and programming internet-primarily based functions, so they have already got the basic capabilities to take care of microservices building. The focus of implementation just needs to shift to the net, if you want to involve adapting to a few new tactics.

The term microservices may also be a source of bewilderment for some former SOA builders. This term might also conjure up the photo of a whole bunch or lots of capabilities that encompass a couple lines of code that can be called upon as necessary. this kind of microservices framework would virtually surely generate enormous delays as a result of message switch latency. Former SOA practitioners should still keep in mind how SOA's componentization design ideas are equally positive for microservices.

where microservices and SOA vary

The difference between stateless and stateful conduct is likely to be essentially the most confounding situation for SOA developers to draw close. One basic rule is that you'll want to in no way store facts inside a microservice. That observe would limit the ability to scale beneath load or change a failed service. in case you should retain data or context across diverse cases in a microservices structure, shop the information both with the calling software and send it to the microservice when or not it's called, or get it from a lower back-end database. Design microservices so that calling them with the same enter will always generate the equal output.

Microservices vs. monolithic architecture

there's also a fundamental change in how SOA capabilities and microservices are used with the aid of an software. SOA services continuously seem as processes or functions, which means they're designed to emulate in the neighborhood written software accessories. as an instance, when an SOA service is needed, you name it. by contrast, microservices don't seem to be called but are a useful resource you draw from. When they are utilized in experience processing, for example, they are caused by an experience as opposed to explicitly called. eventually, microservices are typically stateless, the place most SOA add-ons are stateful.

Addressing safety and governance concerns is additionally extra nuanced in microservices. Many corporations have developed standardized methods for safety, identity administration and governance around SOA. however, most agencies won't have any standardized how one can cope with protection and governance concerns in microservices. Architects relocating to microservices must devise easy methods to tackle these wants after which be certain they are standardized throughout the total IT ecosystem. if they are not, modifications in protection and id techniques will stall deployment. It additionally capability that, when alternatives for brand spanking new applications are recognized, there may be a chance of hidden incompatibilities. thankfully, there are lots of proven token-based systems for identification administration and protection for microservices. Standardizing on one will retain open microservices use with out compromising protection and governance.

If the cloud is the future, then microservices are too.

yet another area where microservices and SOA fluctuate is in organizing workflow. SOA purposes are sometimes linked with an business service bus (ESB), where execution is guided via enterprise process administration (BPM) language. Microservices are known as explicitly from purposes, so the sequencing of system steps is executed on the application stage. also, be aware that microservices are reusable components. They are not big chunks of functions, which is what ESB and BPM languages aid. although, there are programming design patterns that deliver an identical technique orchestration the use of microservices.

Interfaces of any sort require some variety of information change mechanism. With SOA, the ordinary mechanism is XML, which may also be flexible. besides the fact that children, some developers locate XML verbose and complicated. With microservices, that you may still use XML, but many builders gravitate toward JSON as a result of they locate it more straightforward to work with. in case your crew is terribly universal with XML and never Java, which you could use XML. but JSON is most effective in most instances, and the transition should no longer be complicated for many SOA programmers.

Are microservices value it?

The simplest query that continues to be is whether SOA developers actually need to adopt microservices concepts at all. There continues to be a variety of SOA construction going on, and many significant and renowned functions are nonetheless in line with SOA from each a conceptual and implementation perspective. but the cloud encourages a dynamic and elastic vision of utility components, where scalability and resiliency are greater positive than composability by myself. Cloud fashions are improved appropriate for part interfaces which are lightweight and capable of being fashioned dynamically at runtime, which is the best use for a rest-based microservices structure.

If the cloud is the future, then microservices are too. SOA isn't going to vanish, but it surely's additionally not likely to be adapted to these new necessities. software practices are relocating to microservices, so SOA practitioners should still be organized to move there as smartly.


The important hyperlink between SOA and BPM: process Isomorphism | killexams.com Real Questions and Pass4sure dumps

via Jason Bloomberg

Article rating:

September 18, 2009 04:45 AM EDT

Reads:

7,884

ZapThink has long championed the close relationship between business method administration (BPM) projects and service-Oriented structure (SOA) initiatives. As anyone who has been through our Licensed ZapThink Architect Bootcamp can attest, we've a process-centric view of SOA, the place the factor to constructing loosely coupled enterprise features is to aid metadata-pushed compositions that enforce company approaches, what we name provider-Oriented business functions, or SOBAs, for desire of a better time period. however, there remains confusion on this point, amongst enterprise practitioners who see BPM as a enterprise effort and SOA as technology-centric, amongst carriers who see them as separate items in separate markets, and even among pundits who see services as supporting business features however no longer business tactics.

nevertheless, there are plenty of business Architects who do see the connection between these two initiatives, and who've pulled them together into "BPM enabled via SOA" efforts. This synergy, however, is not automated, and requires some tough work each among the americans specializing in optimizing company approaches to better meet changing company wants as neatly because the crew seeking to construct composable enterprise services that help the enterprise agility and enterprise empowerment drivers for his or her SOA initiatives. ZapThink has labored with many such organizations, and over time a distinct most fulfilling follow pattern has emerged, one it truly is each basic as well as refined, and due to this fact, has fallen throughout the cracks of compendia of SOA patterns: the process Isomorphism pattern. understanding this sample and the way to practice it will possibly support businesses pull their BPM and SOA efforts collectively, and much more importantly, improve the alignment of their SOA initiatives with core business drivers.

what is procedure Isomorphism?An isomorphism is a mathematical thought that expresses a relationship between two ideas that are structurally identical but may also differ in their respective implementations. a really simple example would be two tic-tac-toe video games, one with the natural X's and O's, and the different with, say, pink dots and blue dots. The video game board and the suggestions are the same, inspite of the difference in symbols the players use to play the games. If two particular video games observe the identical sequence of strikes, they would be isomorphic.

The time period system isomorphism usually refers to two methods that are structurally identical, customarily between two corporations in the identical business. as an example, if the order-to-cash procedure is structurally similar between groups A and B, that's, the identical steps within the identical order with the identical process logic, those strategies could be isomorphic, besides the fact that the two groups had modifications of their underlying technical implementations of the respective processes. We're the usage of the term in a different way right here, although. process isomorphism in the SOA context is an isomorphism between a process on the one hand, and the SOBA that implements it on the other. In other words, if you were to model a company procedure, and as a separate pastime, mannequin the composition of functions that implements that procedure, the place these two fashions have the same structure, then they'd be isomorphic.

One dialog that helped crystallize this concept became with John Zachman, who became explaining one of the vital changes he has recently made to his seminal Zachman Framework. He has renamed Row three, which had been the device mannequin row, to the gadget common sense row. individuals were perplexing the device mannequin with the physical representation of the equipment, which resides one row down. Our discussion of method isomorphism is just about a design follow that relates these two rows of Column 2, the How column. In essence, the process common sense mannequin is one level above the carrier composition mannequin that implements the system logic. The procedure isomorphism sample states that these two models may still be isomorphic.

method Isomorphism in PracticeWe've been the use of an exquisite example of manner Isomorphism on our LZA course for just a few years now, courtesy of British Petroleum (BP), who introduced at our functional SOA experience in February, 2008 (more about our upcoming practical SOA experience). The presentation focused on how procedure decomposition is the ordinary language between company and IT efforts, and one of the examples focused on the well Work efficiency system, one of lots of methods in their oil drilling line of business:

BP's well Work performance system

the description column in the chart above reflects the four leading subprocesses that make up this process. The Sub-assignment columns represent individual sub-projects, or steps within the process. finally, the supporting service name column indicates the company service that implements the corresponding sub-assignment. The undeniable fact that there's a one-to-one correspondence between sub-projects and aiding services, combined with the implied correspondence between the manner good judgment and the composition common sense, illustrates system Isomorphism. in this primary example, the manner good judgment is an easy linear sequence, but when the common sense were greater complex, say with branching and mistake situations, then the process would show isomorphism if the composition common sense persevered to mirror the technique good judgment.

it is crucial to aspect out that the one-to-one correspondence between technique sub-projects and assisting capabilities is by no capacity a certain issue, and in observe, many companies fail to design their compositions with any such correspondence. generally, the difficulty is that the SOA effort is excessively bottom-up, the place architects specify capabilities based upon present capabilities. Such bottom-up approaches typically yield functions that don't match up with procedure requirements. Equally standard are BPM efforts which are excessively desirable-down, in that they are seeking to optimize methods without due to the fact that the appropriate degree of aspect for these processes to permit features to put into effect steps within the strategies. most effective via taking an iterative strategy where every generation combines right-down and backside-up design is a company prone to achieve method Isomorphism.

The method Isomorphism cost PropositionThe simple benefit of technique Isomorphism is being in a position to use the system illustration to represent the composition and vice-versa. whereas these concepts are essentially diverse, in that they are living on distinctive rows of the Zachman Framework, the isomorphism relationship enables us the luxury of due to the fact that them to be the equal component. In different phrases, we will discuss the composition as even though it had been the technique, and the process as notwithstanding it have been the composition.

This casual equivalence offers us lots of advantages. for example, if technique steps correspond at once to functions, then service reuse is less difficult to achieve than when the correspondence between steps and capabilities is less clear. carrier reuse discussions will also be cast within the context of method overlaps. If two strategies share a sub-assignment, then the SOBAs that put into effect those strategies will share the aiding provider. additionally, the metadata illustration of the composition common sense, as an instance, a BPEL file, will symbolize the technique good judgment itself. with out manner isomorphism, the method good judgment the BPM crew comes up with might not correspond without delay to the BPEL logic for the helping composition. This disconnect can lead at once to misalignment between IT capabilities and enterprise necessities, and also limits company agility, as a result of a scarcity of readability into the connection between process and supporting composition can cause unintentional tight coupling between both.

The ZapThink TakePerhaps the optimum advantage of process Isomorphism, despite the fact, is that it helps to establish a typical language between company and IT. The business folks will also be talking about approaches, and the IT individuals can be speakme about SOBAs, and at a certain stage, they're speaking concerning the identical issue. The architect is aware of they're different concepts, of route, but conversations throughout the business/IT aisle no longer must dwell on the transformations.

The culmination should still be a higher realizing of the synergies between BPM and SOA. If manner experts wish to consider of company services as technique sub-projects, then they can go appropriate ahead. similarly, if technical implementers favor to consider of company techniques as being compositions of capabilities, it's first-class too. And better of all, when the BPM group attracts the manner specification on one white board and the SOA group attracts the composition specification on a further, the two diagrams will look exactly alike. If this is now not enterprise/IT alignment, then what's?

Jason Bloomberg is a leading IT business analyst, Forbes contributor, keynote speaker, and globally identified professional on distinct disruptive tendencies in enterprise expertise and digital transformation. he is ranked #5 on Onalytica’s listing of exact Digital Transformation influencers for 2018 and #15 on Jax’s checklist of suitable DevOps influencers for 2017, the handiest adult to seem on both lists.

As founder and president of Agile Digital Transformation analyst company Intellyx, he advises, writes, and speaks on a various set of subject matters, including digital transformation, artificial intelligence, cloud computing, devops, massive data/analytics, cybersecurity, blockchain/bitcoin/cryptocurrency, no-code/low-code structures and tools, organizational transformation, internet of issues, commercial enterprise structure, SD-WAN/SDX, mainframes, hybrid IT, and legacy transformation, amongst other subject matters.

Mr. Bloomberg’s articles in Forbes are often viewed with the aid of more than one hundred,000 readers. all over his profession, he has published over 1,200 articles (over 200 for Forbes by myself), spoken at over 400 conferences and webinars, and he has been quoted within the press and blogosphere over 2,000 times.

Mr. Bloomberg is the creator or coauthor of 4 books: The Agile architecture Revolution (Wiley, 2013), provider Orient or Be Doomed! How carrier Orientation Will change Your business (Wiley, 2006), XML and internet services Unleashed (SAMS Publishing, 2002), and internet page Scripting thoughts (Hayden Books, 1996). His next ebook, Agile Digital Transformation, is due in the subsequent yr.

At SOA-concentrated business analyst company ZapThink from 2001 to 2013, Mr. Bloomberg created and delivered the Licensed ZapThink Architect (LZA) carrier-Oriented structure (SOA) route and linked credential, certifying over 1,seven hundred experts global. he's one of the normal Managing partners of ZapThink LLC, which was received by Dovel applied sciences in 2011.

previous to ZapThink, Mr. Bloomberg developed a various heritage in eBusiness expertise management and business analysis, including serving as a senior analyst in IDC’s eBusiness Advisory neighborhood, in addition to holding eBusiness management positions at USWeb/CKS (later marchFIRST) and WaveBend solutions (now Hitachi Consulting), and a few application and net building positions.

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The term "digital transformation" (DX) is being used with the aid of everyone for virtually any company initiative that comprises technology, the net, ecommerce, software, and even customer adventure. while the time period has definitely became into a buzzword with a lot of hype, the transition to a extra linked, digital world is real and springs with actual challenges. In his opening keynote, 4 essentials To become DX Hero popularity Now, Jonathan Hoppe, Co-Founder and CTO of complete Uptime technologies, shared that ...

Feb. 6, 2019 04:30 PM EST

 

IBM DATAPOWER on-line practising with the aid of MAXMUNUS | killexams.com Real Questions and Pass4sure dumps

necessities

security-based ideas and protocols

XML-linked applied sciences such as XML schema, XPath, and XSLT

web carrier fundamentals and the internet features protection specification

IBM WebSphere DataPower SOA appliances represent a vital aspect in the holistic strategy of IBM to carrier-oriented structure (SOA). IBM SOA home equipment are aim-built, easy-to-deploy network instruments that simplify, relaxed, and accelerate your XML and internet features deployments whereas extending your SOA infrastructure. These appliances present an creative, pragmatic strategy to harness the power of SOA. through the use of them, that you can concurrently use the cost of your current application, security, and networking infrastructure investments.

route content

DAY 1

Introduction to IBM WebSphere DataPower SOA appliances

DAY 2

DataPower services

activity: creating a simple XML firewall

XML firewall provider

pastime: content-primarily based routing the usage of XML firewalls

Multi-Protocol Gateway provider

exercise: Configuring a Multi-Protocol Gateway service

web service proxy provider

endeavor: Configuring a web carrier Proxy service

carrier level monitoring

internet software firewall service

pastime: creating a web application firewall carrier

DAY 3

Introduction to XSL & XML

recreation: creating an XSLT Stylesheet

DAY 4

DataPower cryptographic tools

exercise: developing cryptographic objects

Securing connections the use of SSL

activity: Configuring SSL on DataPower services

XML risk insurance policy

pastime: protecting in opposition t XML threats

XML and web features safety overview

exercise: net carrier encryption and digital signatures

Authentication, authorization, and auditing

activity: web carrier authentication and authorization

Configuring LDAP the usage of AAA

activity: developing an AAA policy the use of LDAP

DAY 5

DataPower SOA appliance administration

exercise: recreation setup

difficulty decision equipment and mistake coping with

undertaking: Debugging error the usage of the troubleshooting tools and managing mistakes the use of error handlers

Monitoring objects

undertaking: creating, configuring, and managing monitors

To be a part of on-line training session kindly consider free to contact with us

name — saurabh srivastava

e-mail — identity — saurabh@maxmunus.com

Contact No. — +ninety one -8553576305

Skype- saurabhmaxmunus

company site — http://www.maxmunus.com


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Fundamental SOA

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The fundamental differences between microservices and SOA | killexams.com real questions and Pass4sure dumps

For many architects and developers, service-oriented architecture is the software model they are most experienced...

with. But it's possible that management will demand a shift to microservices. As such, SOA developers should understand the differences between microservices and SOA and how to make the transition from the monolith as smooth as possible.

Core concepts in microservices and SOA

There have always been two dimensions to the notion of SOA. At the conceptual level, SOA is a model for building applications by assembling components that can be shared among applications and hosted independently. At the implementation level, SOA developed a series of standards to define application characteristics and interfaces, broker access and provide security, including Simple Object Access Protocol and Web Services Description Language.

Many of SOA's underlying concepts are also core concepts in microservices. However, microservices apply these concepts through the lens of the internet, the web and REST interfaces.

Nearly every development team is familiar with REST and programming web-based applications, so they already have the basic knowledge to cope with microservices development. The focus of implementation just needs to shift to the web, which will involve adapting to some new procedures.

The term microservices can be a source of confusion for some former SOA developers. This term may conjure up the image of hundreds or thousands of services that consist of a couple lines of code that can be called upon as needed. Such a microservices framework would almost surely generate enormous delays because of message transfer latency. Former SOA practitioners should keep in mind how SOA's componentization design principles are equally effective for microservices.

Where microservices and SOA differ

The difference between stateless and stateful behavior is likely to be the most confounding issue for SOA developers to grasp. One simple rule is that you should never store data within a microservice. That practice would limit the ability to scale under load or replace a failed service. If you need to maintain data or context across multiple instances in a microservices architecture, store the data either with the calling software and send it to the microservice when it's called, or get it from a back-end database. Design microservices so that calling them with the same input will always generate the same output.

Microservices vs. monolithic architecture

There is also a fundamental difference in how SOA services and microservices are used by an application. SOA services normally appear as procedures or functions, meaning they are designed to emulate locally written software components. For example, when an SOA service is needed, you call it. By contrast, microservices are not called but are a resource you draw from. When they are used in event processing, for example, they are triggered by an event rather than explicitly called. Finally, microservices are typically stateless, where most SOA components are stateful.

Addressing security and governance issues is also more nuanced in microservices. Many organizations have developed standardized methods for security, identity management and governance around SOA. However, most companies do not have any standardized methods to deal with security and governance issues in microservices. Architects moving to microservices must devise methods to address these needs and then ensure they are standardized across the entire IT ecosystem. If they are not, differences in security and identity procedures will stall deployment. It also means that, when opportunities for new applications are identified, there's a risk of hidden incompatibilities. Thankfully, there are many proven token-based systems for identity management and security for microservices. Standardizing on one will preserve open microservices use without compromising security and governance.

If the cloud is the future, then microservices are too.

Another area where microservices and SOA differ is in organizing workflow. SOA applications are often linked with an enterprise service bus (ESB), where execution is guided by business process management (BPM) language. Microservices are called explicitly from applications, so the sequencing of process steps is done at the application level. Also, remember that microservices are reusable components. They are not big chunks of applications, which is what ESB and BPM languages support. However, there are programming design patterns that provide similar process orchestration using microservices.

Interfaces of any sort require some sort of data exchange mechanism. With SOA, the traditional mechanism is XML, which can be flexible. However, some developers find XML verbose and complicated. With microservices, you can still use XML, but many developers gravitate toward JSON because they find it easier to work with. If your team is very familiar with XML and not Java, you can use XML. But JSON is best in most cases, and the transition should not be difficult for most SOA programmers.

Are microservices worth it?

The only question that remains is whether SOA developers really need to adopt microservices techniques at all. There is still plenty of SOA development going on, and many large and prominent applications are still based on SOA from both a conceptual and implementation perspective. But the cloud encourages a dynamic and elastic vision of application components, where scalability and resiliency are more valuable than composability alone. Cloud models are better suited for component interfaces that are lightweight and capable of being shaped dynamically at runtime, which is the perfect use for a REST-based microservices architecture.

If the cloud is the future, then microservices are too. SOA isn't going to disappear, but it's also unlikely to be adapted to these new requirements. Software practices are moving to microservices, so SOA practitioners should be prepared to go there as well.


Should You Buy Sodifrance SA (EPA:SOA) For Its 2.1% Dividend? | killexams.com real questions and Pass4sure dumps

Dividends can be underrated but they form a large part of investment returns, playing an important role in compounding returns in the long run. Historically, Sodifrance SA (EPA:SOA) has been paying a dividend to shareholders. Today it yields 2.1%. Does Sodifrance tick all the boxes of a great dividend stock? Below, I’ll take you through my analysis.

See our latest analysis for Sodifrance

5 checks you should do on a dividend stock

When assessing a stock as a potential addition to my dividend Portfolio, I look at these five areas:

  • Is it the top 25% annual dividend yield payer?
  • Has it consistently paid a stable dividend without missing a payment or drastically cutting payout?
  • Has it increased its dividend per share amount over the past?
  • Does earnings amply cover its dividend payments?
  • Will the company be able to keep paying dividend based on the future earnings growth?
  • ENXTPA:SOA Historical Dividend Yield September 26th 18

    More Does Sodifrance pass our checks?

    The current trailing twelve-month payout ratio for the stock is 81.5%, which means that the dividend is covered by earnings. Furthermore, analysts have not forecasted a dividends per share for the future, which makes it hard to determine the yield shareholders should expect, and whether the current payout is sustainable, moving forward.

    If you want to dive deeper into the sustainability of a certain payout ratio, you may wish to consider the cash flow of the business. Cash flow is important because companies with strong cash flow can usually sustain higher payout ratios.

    Reliablity is an important factor for dividend stocks, particularly for income investors who want a strong track record of payment and a positive outlook for future payout. Unfortunately, it is really too early to view Sodifrance as a dividend investment. It has only been consistently paying dividends for 8 years, however, standard practice for reliable payers is to look for a 10-year minimum track record.

    In terms of its peers, Sodifrance has a yield of 2.1%, which is high for IT stocks but still below the market’s top dividend payers.

    Next Steps:

    After digging a little deeper into Sodifrance’s yield, it’s easy to see why you should be cautious investing in the company just for the dividend. But if you are not exclusively a dividend investor, the stock could still be an interesting investment opportunity. Given that this is purely a dividend analysis, you should always research extensively before deciding whether or not a stock is an appropriate investment for you. I always recommend analysing the company’s fundamentals and underlying business before making an investment decision. There are three key aspects you should look at:

  • Future Outlook: What are well-informed industry analysts predicting for SOA’s future growth? Take a look at our free research report of analyst consensus for SOA’s outlook.
  • Valuation: What is SOA worth today? Even if the stock is a cash cow, it’s not worth an infinite price. The intrinsic value infographic in our free research report helps visualize whether SOA is currently mispriced by the market.
  • Dividend Rockstars: Are there better dividend payers with stronger fundamentals out there? Check out our free list of these great stocks here.
  • To help readers see past the short term volatility of the financial market, we aim to bring you a long-term focused research analysis purely driven by fundamental data. Note that our analysis does not factor in the latest price-sensitive company announcements.

    The author is an independent contributor and at the time of publication had no position in the stocks mentioned. For errors that warrant correction please contact the editor at editorial-team@simplywallst.com.


    SOA Basics | killexams.com real questions and Pass4sure dumps

    This chapter from 100 SOA Questions answers the questions, what is SOA, is SOA an architectural style, what are fundamental constructs (the DNA) of SOA, what is the difference between a Web Service and an SOA service and what makes a project an SOA implementation?

    This chapter is from the book 
  • Delusions, errors, and lies are like huge, gaudy vessels, the rafters of which are rotten and worm-eaten, and those who embark in them are fated to be shipwrecked.
  • —Buddha
  • Service-oriented architecture (SOA) is defined in a number of ways, but not all definitions are equal, and not all definitions are complete. Instead of just providing another definition of SOA, this chapter describes the basic building blocks of SOA and looks at the value proposition of SOA from key stakeholder perspectives. Besides covering the basic building blocks of SOA, its DNA, and the value propositions of adopting SOA and its ultimate utility, this chapter describes what makes an implementation an SOA deployment. Specifically, this chapter addresses the following questions:

  • What is SOA?
  • Is SOA an architectural style?
  • What are fundamental constructs (the DNA) of SOA?
  • What is the difference between a Web Service and an SOA service?
  • What makes a project an SOA implementation?
  • 1. What Is SOA?

    Numerous vendors, application providers, system integrators, architects, authors, analysts firms, and standards bodies provide definitions of SOA. The definitions of SOA are diverse. Most are complementary and do not conflict with each other. SOA has a variety of definitions because the definition is often tuned to a specific audience, as explaining SOA to a CEO is different from explaining SOA to a programmer. The term service orientation is often used synonymously with SOA, but just like SOA it has a wide range of interpretations. Service orientation is broader and represents a way of thinking about services in the context of business and IT. This book makes no distinction between SOA and service orientation and in some cases may use the two terms synonymously.

    An agreed-upon definition for SOA eludes the industry. Anyone reading Wikipedia's definition page for SOA will see the challenges of trying to gain consensus on an SOA definition. Standards bodies, the OASIS group, and the Open Group have provided complementary but different SOA definitions. Presented with a blank sheet of paper, an artist sees a canvas. A poet might fill it with verse. An engineer seizes the opportunity to make a paper plane. Kids may see it as a future pile of spit wads. SOA is that blank sheet of paper.

    To the chief information officer (CIO), SOA is a journey that promises to reduce the lifetime cost of the application portfolio, maximize return on investment (ROI) in both application and technology resources, and reduce lead times in delivering solutions to the business.

    To the business executive, SOA is a set of services that can be exposed to their customers, partners, and other parts of the organization. Business capabilities, function, and business logic can be combined and recombined to serve the needs of the business now and tomorrow. Applications serve the business because they are composed of services that can be quickly modified or redeployed in new business contexts, allowing the business to quickly respond to changing customer needs, business opportunities, and market conditions.

    To the business analyst, SOA is a way of unlocking value, because business processes are no longer locked in application silos. Applications no longer operate as inhibitors to changing business needs.

    To the chief architect or enterprise architect, SOA is a means to create dynamic, highly configurable and collaborative applications built for change. SOA reduces IT complexity and rigidity. SOA becomes the solution to stop the gradual entropy that makes applications brittle and difficult to change. SOA reduces lead times and costs because reduced complexity makes modifying and testing applications easier when they are structured using services.

    To the IT architect, SOA is the architectural solution for integrating diverse systems by providing an architectural style that promotes loose coupling and reuse. Many IT architects think they have seen this style before with earlier architectural initiatives such as DCE, the Distributed Computing Environment, and CORBA, the Common Object Request Broker Architecture.

    To the developer, SOA is a programming model or paradigm where web services and contracts becomes a dominant design for interoperability. It is a web service when it uses a Web Service Description Language (WSDL) or equivalent specification for describing the service. Web services enable organizations to communicate information, using messages, without intimate knowledge of each other's IT systems.

    Delivering on the promises of SOA (improved business agility, maximized ROI, reduced IT complexity and rigidity, reduced costs, reduced lead times, reduced risk, new opportunities to deliver value, increased participation in value networks, and incremental implementation) requires you take a holistic view of SOA. If we limit the view of SOA to a single stakeholder (e.g., IT architect, developer, or business analyst) the benefits will not accrue because SOA then just becomes one in a long list of overhyped technologies rather than a novel approach to building flexible business solutions.

    2. Is SOA an Architectural Style?

    SOA is often seen as an architectural style that has been around for years. Figure 1.1 shows the architectural style of SOA. In this scenario, a service consumer invokes or uses a service. The service consumer uses the service description to obtain necessary information about the provider service (e.g., account service) to be consumed. The service description provides the binding information so the consumer can connect to the service, and the description identifies the various operations (e.g., open or close account) available from the provider service. A broker can be used to find the service using a registry that houses information about the service and its location.

    In Figure 1.1, it is difficult to determine how the architecture style of SOA enables the strategic benefits of SOA, such as lowering the lifetime cost of an application or bringing faster time to market or making applications resilient to change. SOA as an architectural style often makes an SOA project solely an IT endeavor where the strategic business benefits of SOA no longer become the focus or measured outcomes. Benefits of process flexibility, time-to-market savings, lower costs, and others can be achieved with SOA, but only if we holistically adopt all stakeholder views of SOA and its application and pursue SOA adoption accordingly. When pundits, architects, consultants, or executives define SOA as a pure technology play or as solely an architectural style, they relegate it to the realm of IT science projects, overhyped technologies, and a marketing strategy rather than a novel approach to building flexible business solutions.

    An understanding of SOA is enhanced with the next question and answer. By looking at the SOA building blocks of SOA, you can gain a fuller understanding of what SOA is and how to realize its promised benefits.

    3. What Are the Fundamental Constructs (the DNA) of SOA?

    The most basic construct or building block of SOA is a service. Software engineering over the years has evolved from procedural to structured programming to object-oriented programming to component-based development and now to service oriented. Figure 1.2 illustrates the different levels of abstraction from objects to services. Each evolution of abstraction builds on the previous, and SOA embraces the best practices of object and component development.

    To see architectural style of SOA, refer to Figure 1.1. That illustration shows the fundamental constructs of SOA, such as the service consumer and the service provider and their relationship. The consumer invokes a service, the business functionality, by contract. The provider of the service defines the contract as a service description. An intermediary, such as a broker, uses a registry to find or search for published services. Service consumer, service provider, service description, service broker, and a registry are all part of the DNA of SOA.

    A service in SOA is the logical, self-contained business function. Services in SOA have the following attributes:

  • Stateless: SOA services neither remember the last thing they were asked to do nor do they care what the next is. Services are not dependent on the context or state of other services, only on their functionality. Talking on the telephone is stateful, whereas posting a letter is stateless. The World Wide Web provides an excellent example, where each request from a user for a web page or URL results in the requested pages being served, but without the web server remembering the request later. Each request or communication is discrete and unrelated to requests that precede or follow it.
  • Discoverable: A service must be discoverable by potential consumers of the service. After all, if a service is not known to exist, it is unlikely ever to be used. Services are published or exposed by service providers in the SOA service directory, from which they are discovered and invoked by service consumers.
  • Self-describing: The SOA service interface describes, exposes, and provides an entry point to the service. The interface contains all the information a service consumer needs to discover and connect to the service, without ever requiring the consumer to understand (or even see) the technical implementation details.
  • Composable: SOA services are, by nature, composite. They can be composed from other services and, in turn, can be combined with other services to compose new business solutions.
  • Loose coupling: Loose coupling allows the concerns of application features to be separated into independent pieces. This separation of concern provides a mechanism for one service to call another without being tightly bound to it. Separation of concerns is achieved by establishing boundaries, where a boundary is any logical or physical separation that delineates a given set of responsibilities. For example, an account service has open account, authorization, and audit features representing delineations of responsibilities and three separations of concerns.
  • Governed by policy: Services are built by contract. Relationships between services (and between services and service domains) are governed by policies and service-level agreements (SLAs), promoting process consistency and reducing complexity.
  • Independent location, language, and protocol: Services are designed to be location transparent and protocol/platform independent (generally speaking, accessible by any authorized user, on any platform, from any location).
  • In addition, services in a service-oriented architecture typically have the following characteristics:

  • Coarse-grained: Services are typically coarse-grained business functions. Granularity is a statement of functional richness for a service—the more coarse-grained a service is, the richer the function offered by the service. Coarse-grained services reduce complexity for system developers by limiting the steps necessary to fulfill a given business function, and they reduce strain on system resources by limiting the "chattiness" of the electronic conversation. Applications by nature are coarse-grained because they encompass a large set of functionality; the components that comprise applications would be fine-grained. Similarly, within an application, a service such as "get account information" (which returns name, account number, and address) could be described as coarse-grained, whereas a service to "get account number" could be described as fine-grained.
  • Asynchronous: Asynchronous communication is not required of an SOA service, but it does increase system scalability through asynchronous behavior and messaging techniques. Unpredictable network latency and high communications costs can slow response times in an SOA environment, due to the distributed nature of services. Asynchronous behavior and messaging allow a service to issue a service request and then continue processing until the service provider returns a response.
  • Viewed from the top down, SOA comprises the following constructs, as illustrated in Figure 1.3: consumer, business processes, services, components, information, rules, and policies. Consumers allow invocation or composition of services at the consumer layer through social software, mashups, business processes, or other systems. Business processes represent the flows of activities required to complete a business process; they are compositions of services targeted to achieve business goals. Services are the main structuring element required by a service consumer and are provided by the service provider. Services offer functionality and quality of service, both of which are externalized within service descriptions and policies. Services can be composed of other services, thus making them composite services. Components realize not only the functionality of the services they expose but also ensure their quality of service. Information flows between the layers (for example, consumer, process, and service) and within a layer. Lastly, rules and policies exist for services, components, and flows.

    Although objects are illustrated in Figure 1.3, the word object does not imply an implementation of object orientation, because the object can easily be a procedural subroutine implemented in a multitude of languages as easily as it can be implemented in a object-oriented programming language. SOA must have services and components that realize the services. Processes or flows may string services together to fulfill a step or activity of a business process. For example a transfer of funds service may string together both a debit and credit account service.

    There is also a technology view of SOA. Technology enables SOA, makes it efficient, and optimizes the implementation, but SOA is not defined by the technologies chosen for implementation. Instead, SOA is defined by providing a uniform means to offer, discover, interact with, and use capabilities (services) to produce desired effects consistent with measurable expectations.

    The major technologies associated with SOA include business-focused tools, software construction tools, and middleware technologies. Figure 1.4 illustrates the basic technology building blocks for SOA. Tools are required for SOA addressing design-time and runtime scenarios. Business stakeholders use business-focused tools for modeling and analysis of business processes and flows, and they will also use business activity monitoring technology to gain insights into business performance of processes and workflow. IT practitioners use a set of tools for development of business applications and for managing the operating environment addressing integration, monitoring, and security.

    The DNA of SOA will most likely be further investigated and defined by standards groups actively involved in defining an SOA ontology. For example, see www.opengroup.org/projects/soa-ontology/. Such an ontology will address SOA key concepts, including services, service contracts, service interfaces, composition (orchestration, choreography, and collaboration), processes, service compositions, policies, and events. Each of these makes up the DNA of SOA.

    4. What Is the Difference Between a Web Service and an SOA Service?

    The distinction between business services or SOA services versus a web service is not often articulated, and many equate the two as being the same. SOA services can be realized as web services, but not all web services are equal to SOA services. Web services represent the use of both a published standard and a set of technologies for invocation and interoperability. SOA services are services that fulfill a key step or activity of a business process and can be described as business services and are often exposed as web services.

    Figure 1.3 illustrates both an SOA service and a web service. The picture shows the difference between SOA and web services at runtime (i.e., implementation level) and at design time. The web service is illustrated on the right side of Figure 1.5, specifically the Web Services Description Language (WSDL) and its attributes such as port types and operations. The attribute that makes it a web service is the use of WSDL or equivalent.

    In design, we identify and specify a service that provides the design, or we identify and specify interfaces that include method specifications. The combination of the definition of the method and the interface at design time is what we refer to as a service from an SOA perspective. Use cases can be used to capture the functional requirements for a service. Figure 1.5 contrasts the differences between a service in SOA and a web service. Both SOA services and web services are part of the DNA of SOA.

    In an SOA, business processes, activities, and workflow are broken down into constituent functional elements called services. They can be accessed and used directly by applications, or they can be mixed and matched with other services to create new business capabilities. Business services or SOA services are reusable business capabilities. Examples in banking include open account or change address. For transportation, it might be get reservation or hold reservation, and with loan processing, get loan, apply for loan, and update address are examples of business services. Business processes are also key constructs of SOA, part of its DNA.

    5. What Makes a Project an SOA Implementation?

    The deployment of services makes a project an SOA implementation, where a service is defined in the preceding answer as a web service or an SOA service. The use of the Web Service Description Language (WSDL) or equivalent makes a service a web service. An SOA service must satisfy the criteria described in the Answer 2; namely, an SOA service must be stateless; discoverable; self-describing; composable; loosely coupled; governed; and independent of location, language, or protocol. That is, the use of services alone makes the project or implementation an SOA implementation. However, an SOA implementation may not accrue the desired benefits of SOA around cost savings, reuse, time to market, or flexibility.

    Services can have different levels of maturity. For example, services can be ad hoc in their design and implementation where a WSDL façade is implemented to make function accessible to other systems or applications. Services can also be architected where service modeling and governance are used to maximize service reuse.

    The implementation of SOA technologies without a deployment of one or more services could also be defined as an SOA implementation. This would be atypical because middleware and infrastructure implementations (e.g., a registry or enterprise service bus) would be implemented in conjunction with the deployment of services.

    Just as services have different levels of maturity, so do SOA adoptions within an organization. Some SOA adoptions require a program of projects to address a journey of increasing maturity to achieve strategic SOA goals of building systems for change, infusing flexibility as an attribute of systems, or reducing the lifetime costs of applications and infrastructure. In this case, the program comprises a series of SOA projects that incrementally raise the maturity of SOA in an organization and along the way enable the realization of the strategic SOA benefits.

    Often, because of overselling of SOA, organization leaders, managers, and executives wrongly believe that the benefits of SOA automatically accrue when an SOA implementation occurs. SOA has varied and diverse definitions, and hence its implementations are equally varied. So, organizations seeking to accrue any of the promised benefits of SOA must do more than focus on SOA implementations. That is, each expected benefit of SOA requires a different level of SOA maturity. For example, if the goal is only to reduce the cycle time of a business process that deals with external partners, exposing web services may be the only necessary SOA adoption. However, if the business goal is to reduce time to market for new products, this requires a broader adoption of SOA that addresses reusable services, structuring of applications using services, improving integration using services, and aspects of SOA governance to address service sharing, funding, and ownership.



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