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S90-18A - Fundamental SOA Security - Dump Information

Vendor : SOA
Exam Code : S90-18A
Exam Name : Fundamental SOA Security
Questions and Answers : 98 Q & A
Updated On : November 12, 2018
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S90-18A Questions and Answers

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S90-18A Fundamental SOA Security

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S90-18A exam Dumps Source : Fundamental SOA Security

Test Code : S90-18A
Test Name : Fundamental SOA Security
Vendor Name : SOA
Q&A : 98 Real Questions

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SOA Fundamental SOA Security

The simple changes between microservices and SOA | killexams.com Real Questions and Pass4sure dumps

for a lot of architects and builders, service-oriented structure is the software mannequin they are most skilled...

with. however's viable that management will demand a shift to microservices. As such, SOA builders should take into account the changes between microservices and SOA and how to make the transition from the monolith as smooth as feasible.

Core ideas in microservices and SOA

There have always been two dimensions to the notion of SOA. on the conceptual stage, SOA is a mannequin for constructing applications with the aid of assembling components that can be shared among purposes and hosted independently. on the implementation stage, SOA developed a sequence of requirements to define software characteristics and interfaces, broking service access and provide protection, together with primary Object access Protocol and internet services Description Language.

many of SOA's underlying ideas are also core ideas in microservices. however, microservices practice these ideas during the lens of the information superhighway, the net and relaxation interfaces.

very nearly every development team is time-honored with leisure and programming web-primarily based purposes, in order that they have already got the fundamental knowledge to deal with microservices construction. The focal point of implementation simply must shift to the internet, in an effort to involve adapting to a few new processes.

The time period microservices will also be a source of bewilderment for some former SOA builders. This term may additionally conjure up the photo of lots of or lots of features that consist of a pair strains of code that can be called upon as mandatory. one of these microservices framework would pretty much absolutely generate huge delays because of message switch latency. Former SOA practitioners may still keep in mind how SOA's componentization design ideas are equally advantageous for microservices.

the place microservices and SOA fluctuate

The change between stateless and stateful behavior is probably going to be the most confounding subject for SOA developers to hold close. One simple rule is that be sure to on no account keep facts within a microservice. That apply would restrict the capacity to scale beneath load or exchange a failed service. in case you should hold records or context throughout numerous circumstances in a microservices structure, store the facts either with the calling application and send it to the microservice when it be known as, or get it from a lower back-end database. Design microservices so that calling them with the identical input will all the time generate the equal output.

Microservices vs. monolithic architecture

there's also a fundamental change in how SOA functions and microservices are used by way of an utility. SOA capabilities continually seem as approaches or capabilities, that means they're designed to emulate in the neighborhood written software add-ons. as an instance, when an SOA carrier is needed, you call it. by contrast, microservices aren't referred to as however are a aid you draw from. When they are utilized in adventure processing, as an instance, they're brought on through an adventure rather than explicitly known as. eventually, microservices are typically stateless, the place most SOA components are stateful.

Addressing safety and governance concerns is also more nuanced in microservices. Many companies have developed standardized methods for protection, identity administration and governance around SOA. despite the fact, most groups do not have any standardized how one can contend with security and governance issues in microservices. Architects relocating to microservices ought to devise how one can handle these wants after which be certain they're standardized throughout the total IT ecosystem. if they aren't, modifications in protection and identity processes will stall deployment. It also capability that, when alternatives for brand new applications are recognized, there's a chance of hidden incompatibilities. luckily, there are many confirmed token-based mostly methods for id management and protection for microservices. Standardizing on one will keep open microservices use devoid of compromising security and governance.

If the cloud is the long run, then microservices are too.

an extra enviornment where microservices and SOA fluctuate is in organizing workflow. SOA functions are sometimes linked with an business service bus (ESB), where execution is guided by means of business method administration (BPM) language. Microservices are known as explicitly from functions, so the sequencing of system steps is achieved at the software stage. also, remember that microservices are reusable add-ons. They are not big chunks of applications, which is what ESB and BPM languages help. youngsters, there are programming design patterns that deliver equivalent technique orchestration using microservices.

Interfaces of any type require some form of statistics exchange mechanism. With SOA, the average mechanism is XML, which can be bendy. besides the fact that children, some developers discover XML verbose and complicated. With microservices, you can nevertheless use XML, but many builders gravitate towards JSON because they locate it easier to work with. in case your group is very typical with XML and not Java, that you would be able to use XML. however JSON is most appropriate in most cases, and the transition may still now not be elaborate for most SOA programmers.

Are microservices value it?

The simplest query that is still is whether or not SOA developers actually need to undertake microservices innovations at all. There remains plenty of SOA construction going on, and a lot of large and trendy functions are still in accordance with SOA from both a conceptual and implementation point of view. however the cloud encourages a dynamic and elastic imaginative and prescient of utility add-ons, the place scalability and resiliency are extra positive than composability alone. Cloud models are more suitable proper for component interfaces that are light-weight and in a position to being shaped dynamically at runtime, which is the best use for a rest-based microservices architecture.

If the cloud is the long run, then microservices are too. SOA is never going to vanish, however's also not likely to be tailored to those new necessities. software practices are relocating to microservices, so SOA practitioners may still be organized to move there as well.


SOA basics | killexams.com Real Questions and Pass4sure dumps

This chapter from a hundred SOA Questions answers the questions, what's SOA, is SOA an architectural vogue, what are primary constructs (the DNA) of SOA, what is the change between a web carrier and an SOA provider and what makes a mission an SOA implementation?

This chapter is from the booklet 
  • Delusions, errors, and lies are like large, 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 described in a couple of approaches, however now not all definitions are equal, and never all definitions are comprehensive. in its place of just featuring an additional definition of SOA, this chapter describes the primary constructing blocks of SOA and looks at the cost proposition of SOA from key stakeholder views. anyway protecting the primary building blocks of SOA, its DNA, and the cost propositions of adopting SOA and its most fulfilling utility, this chapter describes what makes an implementation an SOA deployment. peculiarly, this chapter addresses the following questions:

  • what is SOA?
  • Is SOA an architectural trend?
  • What are basic constructs (the DNA) of SOA?
  • what's the change between an internet provider and an SOA service?
  • What makes a project an SOA implementation?
  • 1. what's SOA?

    numerous vendors, utility suppliers, gadget integrators, architects, authors, analysts enterprises, and specifications our bodies supply definitions of SOA. The definitions of SOA are different. Most are complementary and don't conflict with every different. SOA has a variety of definitions since the definition is commonly tuned to a specific viewers, as explaining SOA to a CEO is distinct from explaining SOA to a programmer. The term provider orientation is regularly used synonymously with SOA, however just like SOA it has a big range of interpretations. carrier orientation is broader and represents a way of considering capabilities in the context of business and IT. This publication makes no distinction between SOA and repair orientation and in some situations may additionally use both phrases synonymously.

    An agreed-upon definition for SOA eludes the industry. any one analyzing Wikipedia's definition web page for SOA will see the challenges of attempting to benefit consensus on an SOA definition. necessities bodies, the OASIS group, and the Open group have provided complementary but distinctive SOA definitions. presented with a blank sheet of paper, an artist sees a canvas. A poet may fill it with verse. An engineer seizes the probability to make a paper plane. kids can also see it as a future pile of spit wads. SOA is that blank sheet of paper.

    To the manager counsel officer (CIO), SOA is a experience that guarantees to in the reduction of the lifetime charge of the application portfolio, maximize return on funding (ROI) in each application and expertise substances, and in the reduction of lead instances in delivering options to the business.

    To the enterprise govt, SOA is a collection of features that can be exposed to their purchasers, partners, and different parts of the company. business capabilities, feature, and business good judgment will also be mixed and recombined to serve the needs of the business now and the next day. functions serve the company as a result of they're composed of services that may also be quickly modified or redeployed in new company contexts, permitting the business to immediately respond to altering customer needs, enterprise opportunities, and market circumstances.

    To the company analyst, SOA is a method of unlocking value, as a result of company tactics are not any longer locked in application silos. purposes no longer function as inhibitors to changing company wants.

    To the executive architect or business architect, SOA is a method to create dynamic, incredibly configurable and collaborative purposes developed for alternate. SOA reduces IT complexity and rigidity. SOA becomes the answer to cease the gradual entropy that makes purposes brittle and difficult to trade. SOA reduces lead times and costs because reduced complexity makes enhancing and checking out purposes easier when they're structured the usage of functions.

    To the IT architect, SOA is the architectural answer for integrating distinctive methods by using presenting an architectural fashion that promotes free coupling and reuse. Many IT architects consider they have got viewed this trend before with past architectural initiatives equivalent to DCE, the distributed Computing environment, and CORBA, the normal Object Request broking service architecture.

    To the developer, SOA is a programming model or paradigm the place web services and contracts turns into a dominant design for interoperability. it's an internet provider when it makes use of an internet service Description Language (WSDL) or equivalent specification for describing the carrier. net services enable corporations to talk advice, the use of messages, without intimate advantage of each and every different's IT programs.

    supplying on the promises of SOA (more suitable company agility, maximized ROI, decreased IT complexity and rigidity, reduced prices, decreased lead instances, reduced possibility, new alternatives to convey value, improved participation in price 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 enterprise analyst) the advantages will no longer accrue as a result of SOA then just becomes one in a protracted list of overhyped applied sciences in preference to a novel strategy to constructing bendy business solutions.

    2. Is SOA an Architectural style?

    SOA is regularly seen as an architectural trend that has been around for years. determine 1.1 suggests the architectural vogue of SOA. during this state of affairs, a service purchaser invokes or makes use of a service. The provider client makes use of the carrier description to acquire imperative information in regards to the issuer carrier (e.g., account carrier) to be consumed. The carrier description provides the binding guidance so the consumer can connect to the carrier, and the description identifies the a lot of operations (e.g., open or shut account) accessible from the company carrier. A broker can also be used to discover the carrier using a registry that houses counsel in regards to the service and its place.

    In determine 1.1, it is tricky to investigate how the architecture vogue of SOA permits the strategic merits of SOA, such as lowering the lifetime charge of an application or bringing quicker time to market or making applications resilient to exchange. SOA as an architectural trend frequently makes an SOA undertaking fully an IT pastime the place the strategic business benefits of SOA now not develop into the focal point or measured results. benefits of system flexibility, time-to-market discount rates, reduce costs, and others can also be completed with SOA, however simplest if we holistically undertake all stakeholder views of SOA and its software and pursue SOA adoption for that reason. When pundits, architects, consultants, or executives define SOA as a pure know-how play or as solely an architectural trend, they relegate it to the realm of IT science projects, overhyped applied sciences, and a advertising method in preference to a novel strategy to constructing bendy enterprise solutions.

    An understanding of SOA is stronger with the next question and answer. via looking on the SOA constructing blocks of SOA, that you could gain a fuller understanding of what SOA is and the way to understand its promised benefits.

    three. What Are the fundamental Constructs (the DNA) of SOA?

    probably the most simple assemble or building block of SOA is a provider. utility engineering over the years has evolved from procedural to structured programming to object-oriented programming to part-based mostly building and now to provider oriented. determine 1.2 illustrates the distinctive ranges of abstraction from objects to capabilities. every evolution of abstraction builds on the previous, and SOA embraces the choicest practices of object and part development.

    to peer architectural style of SOA, consult with figure 1.1. That illustration suggests the primary constructs of SOA, such because the carrier customer and the service provider and their relationship. The customer invokes a service, the company performance, via contract. The company of the carrier defines the contract as a carrier description. An intermediary, similar to a broking service, makes use of a registry to discover or seek posted services. provider client, service company, carrier description, service broker, and a registry are all a part of the DNA of SOA.

    A carrier in SOA is the logical, self-contained company function. capabilities in SOA have the following attributes:

  • Stateless: SOA capabilities neither remember the final aspect they have been requested to do nor do they care what the next is. capabilities are not stylish on the context or state of other capabilities, most effective on their functionality. speaking on the telephone is stateful, whereas posting a letter is stateless. The everywhere net gives a superb illustration, where each and every request from a person for a web web page or URL consequences in the requested pages being served, however devoid of the internet server remembering the request later. every request or communication is discrete and unrelated to requests that precede or comply with it.
  • Discoverable: A provider must be discoverable via talents consumers of the carrier. after all, if a provider isn't normal to exist, it's not likely ever to be used. services are posted or uncovered via carrier providers in the SOA carrier directory, from which they're found out and invoked by using carrier consumers.
  • Self-describing: The SOA service interface describes, exposes, and offers an entry point to the service. The interface carries all of the counsel a service consumer needs to find and attach to the service, without ever requiring the purchaser to be mindful (and even see) the technical implementation details.
  • Composable: SOA services are, via nature, composite. They can also be composed from other services and, in flip, will also be combined with different capabilities to compose new enterprise options.
  • loose coupling: loose coupling makes it possible for the concerns of software elements to be separated into unbiased items. This separation of problem offers a mechanism for one provider to call a different without being tightly certain to it. Separation of concerns is done by establishing boundaries, the place a boundary is any logical or actual separation that delineates a given set of obligations. for instance, an account service has open account, authorization, and audit facets representing delineations of obligations and three separations of concerns.
  • governed with the aid of policy: functions are built by way of contract. Relationships between capabilities (and between features and service domains) are ruled by means of guidelines and repair-degree agreements (SLAs), promoting manner consistency and reducing complexity.
  • independent vicinity, language, and protocol: capabilities are designed to be place clear and protocol/platform unbiased (generally speakme, available by any authorized person, on any platform, from any vicinity).
  • furthermore, services in a provider-oriented architecture usually have here qualities:

  • Coarse-grained: services are customarily coarse-grained business functions. Granularity is a press release of functional richness for a provider—the extra coarse-grained a carrier is, the richer the characteristic provided by way of the provider. Coarse-grained features reduce complexity for equipment builders by way of limiting the steps crucial to fulfill a given enterprise function, and they cut back strain on equipment materials by limiting the "chattiness" of the electronic conversation. functions through nature are coarse-grained because they encompass a huge set of performance; the add-ons that incorporate purposes can be great-grained. in a similar way, inside an application, a carrier akin to "get account information" (which returns identify, account quantity, and tackle) may well be described as coarse-grained, whereas a service to "get account quantity" may well be described as exceptional-grained.
  • Asynchronous: Asynchronous communique is not required of an SOA service, however it does increase system scalability via asynchronous behavior and messaging innovations. Unpredictable network latency and excessive communications prices can sluggish response times in an SOA environment, due to the dispensed nature of services. Asynchronous behavior and messaging enable a provider to challenge a carrier request after which continue processing except the service issuer returns a response.
  • considered from the true down, SOA comprises the following constructs, as illustrated in determine 1.three: consumer, business approaches, capabilities, components, information, suggestions, and policies. buyers permit invocation or composition of services at the client layer through social software, mashups, company tactics, or other techniques. company methods symbolize the flows of actions required to finished a enterprise procedure; they are compositions of services targeted to achieve business desires. services are the leading structuring element required by a provider purchaser and are provided through the provider issuer. features present functionality and satisfactory of provider, each of which can be externalized inside provider descriptions and guidelines. features can also be composed of different features, therefore making them composite functions. accessories recognize not most effective the performance of the services they expose but also ensure their satisfactory of service. counsel flows between the layers (as an example, purchaser, process, and repair) and inside a layer. ultimately, suggestions and guidelines exist for capabilities, add-ons, and flows.

    besides the fact that children objects are illustrated in figure 1.three, the word object doesn't indicate an implementation of object orientation, since the object can with ease be a procedural subroutine applied in a mess of languages as easily because it may also be carried out in a object-oriented programming language. SOA ought to have services and components that realize the capabilities. techniques or flows may additionally string features collectively to fulfill a step or exercise of a business procedure. as an instance a switch of cash provider can also string collectively each a debit and credit score account provider.

    there's also a know-how view of SOA. technology allows SOA, makes it efficient, and optimizes the implementation, but SOA isn't described by the applied sciences chosen for implementation. in its place, SOA is defined by way of presenting a uniform capability to present, discover, engage with, and use capabilities (functions) to supply desired results in step with measurable expectations.

    The primary technologies linked to SOA consist of company-concentrated tools, utility construction tools, and middleware applied sciences. figure 1.four illustrates the basic know-how constructing blocks for SOA. tools are required for SOA addressing design-time and runtime scenarios. enterprise stakeholders use enterprise-focused tools for modeling and evaluation of enterprise techniques and flows, and they're going to also use enterprise exercise monitoring expertise to benefit insights into enterprise efficiency of approaches and workflow. IT practitioners use a group of equipment for building of enterprise functions and for managing the operating atmosphere addressing integration, monitoring, and security.

    The DNA of SOA will undoubtedly be extra investigated and defined by requisites organizations actively worried in defining an SOA ontology. as an example, see www.opengroup.org/projects/soa-ontology/. Such an ontology will tackle SOA key ideas, including functions, carrier contracts, service interfaces, composition (orchestration, choreography, and collaboration), processes, provider compositions, guidelines, and movements. each and every of these makes up the DNA of SOA.

    four. what is the change Between a web provider and an SOA service?

    The distinction between business functions or SOA capabilities versus a web provider isn't often articulated, and a lot of equate the two as being the identical. SOA capabilities will also be realized as web services, however not all web features are equal to SOA features. web services characterize the use of each a broadcast usual and a set of applied sciences for invocation and interoperability. SOA services are features that fulfill a key step or undertaking of a business manner and might be described as business functions and are sometimes exposed as net services.

    figure 1.3 illustrates each an SOA service and an internet provider. The image indicates the change between SOA and web services at runtime (i.e., implementation stage) and at design time. The web provider is illustrated on the appropriate facet of determine 1.5, certainly the web features Description Language (WSDL) and its attributes comparable to port types and operations. The attribute that makes it an internet provider is using WSDL or equal.

    In design, we identify and specify a carrier that provides the design, or we determine and specify interfaces that consist of formulation specifications. The mixture of the definition of the formula and the interface at design time is what we seek advice from as a provider from an SOA standpoint. Use circumstances can be used to trap the purposeful necessities for a service. determine 1.5 contrasts the ameliorations between a carrier in SOA and a web provider. each SOA functions and web services are part of the DNA of SOA.

    In an SOA, company techniques, actions, and workflow are damaged down into constituent purposeful elements known as capabilities. They can also be accessed and used at once via applications, or they will also be blended and matched with different services to create new business capabilities. enterprise services or SOA capabilities are reusable company capabilities. Examples in banking encompass open account or exchange handle. For transportation, it can be get reservation or hang reservation, and with loan processing, get mortgage, observe for loan, and update tackle are examples of business capabilities. company techniques are additionally key constructs of SOA, a part of its DNA.

    5. What Makes a challenge an SOA Implementation?

    The deployment of functions makes a challenge an SOA implementation, where a carrier is described within the preceding reply as a web carrier or an SOA provider. using the net service Description Language (WSDL) or equal makes a provider a web provider. An SOA service need to satisfy the criteria described within the answer 2; specifically, an SOA carrier need to be stateless; discoverable; self-describing; composable; loosely coupled; governed; and independent of location, language, or protocol. this is, using capabilities by myself makes the assignment or implementation an SOA implementation. however, an SOA implementation may also not accrue the desired advantages of SOA around cost discount rates, reuse, time to market, or flexibility.

    services can have different degrees of maturity. as an example, functions can be ad hoc in their design and implementation the place a WSDL façade is carried out to make characteristic accessible to other programs or applications. features can also be architected where carrier modeling and governance are used to maximize carrier reuse.

    The implementation of SOA applied sciences with out a deployment of 1 or more capabilities might even be described as an SOA implementation. this is able to be abnormal as a result of middleware and infrastructure implementations (e.g., a registry or commercial enterprise carrier bus) would be carried out at the side of the deployment of features.

    simply as capabilities have different levels of maturity, so do SOA adoptions within a firm. Some SOA adoptions require a application of tasks to tackle a event of increasing maturity to achieve strategic SOA desires of constructing programs for alternate, infusing flexibility as an attribute of methods, or reducing the lifetime fees of functions and infrastructure. during this case, the application contains a sequence of SOA tasks that incrementally raise the maturity of SOA in a firm and along the way enable the consciousness of the strategic SOA advantages.

    often, as a result of overselling of SOA, corporation leaders, managers, and executives wrongly consider that the merits of SOA automatically accrue when an SOA implementation occurs. SOA has distinctive and diverse definitions, and therefore its implementations are equally varied. So, organizations seeking to accrue any of the promised advantages of SOA should do greater than center of attention on SOA implementations. that is, every anticipated benefit of SOA requires a unique stage of SOA maturity. for instance, if the purpose is only to reduce the cycle time of a enterprise manner that offers with exterior partners, exposing web capabilities could be the most effective fundamental SOA adoption. youngsters, if the enterprise intention is to cut back time to market for brand spanking new items, this requires a broader adoption of SOA that addresses reusable capabilities, structuring of purposes the usage of capabilities, enhancing integration the use of features, and points of SOA governance to handle carrier sharing, funding, and possession.


    a way to explain SOA to Your CIO | killexams.com Real Questions and Pass4sure dumps

    the way to clarify SOA to Your CIO

    SOAs will aid trade how company and IT work collectively. it'll take time, even though. meanwhile, right here's what you need your CIO to know so that your company can circulate in the appropriate course.

  • by Linda Briggs
  • eleven/01/2004
  • You recognize the way it works with the latest buzzword. The day is coming if you'll run into a person from desirable management in the elevator, or in the hallway after a gathering, and he or she will casually ask, "So what are we doing at the moment about SOAs?" it's in the event you need to be competent with simply the correct quantity of information to help a proper-stage enterprise government bear in mind why a provider-oriented structure (SOA) is a good option and anything you're smartly-located for notwithstanding it might not remedy each IT problem. To help you explain that and extra, right here's a primer on the strategic ideas and company advantages at the back of SOA.

    For starters, some quick features on SOAs: As nearly everybody is fond of mentioning, service-oriented architectures have been round for a very long time. it be a reasonably basic conception, basically: to standardize utility features, or capabilities, in order that a large number of numerous purposes and technologies can share them—both inner and outside the business. The loose coupling of systems and facts that's the hallmark of SOAs helps tackle what has turn into a major difficulty in enterprise: complex, rigid systems that do not share data well and can't be reconfigured right now to satisfy altering company needs.

    "when you are your organization, you doubtless have duplicate programs and approaches with a lot of copying and pasting from one device to one other," based on Dave Mendlen, Microsoft director of internet capabilities advertising and marketing. "as an instance, there may be lots of investment in CRM systems, but [companies] have not gotten lots of advantage from it. [With an SOA], that you may now leverage that investment and get reuse at a macro stage."

    Predecessors akin to CORBA and EDI in no way quite delivered on their premise of widely wide-spread interoperability as a result of they're tightly coupled, and since the technical community hasn't been in a position to agree on commonplace standards. With XML and web functions in area, and greater key requisites falling into line the entire time, carrier-oriented architectures can at last delivery to fulfill their promise.

    In explaining all this to your CIO, you will are looking to be cautious about distinguishing between web features and repair-oriented architectures (see "SOA: Debunking three regular Myths"), in line with Jason Bloomberg of ZapThink, an analyst firm that focuses on XML, web services, and SOAs. "they're various things and have distinct implementation patterns and distinctive quotes of return. web functions are extra tactical, solving integration issues; SOAs are greater strategic and supply enhanced company utility." web services are one of the vital parts, in different words; SOAs are the connections between them.

    That ends up in the much-repeated promises of SOA—loosely coupled capabilities and flexible application leading to agile enterprise processes. it is all smartly and good, however from a CIO's factor of view, you are looking to be sure to highlight the enterprise case. after all, here is an industry that sees hype around new applied sciences come and go like airplanes into O'Hare foreign. fortunately, with SOA, there are a variety of true business merits forward.

    Gauging the business ReturnsOne key improvement to stress is the vision of reusing existing methods and statistics. At many corporations, doubtless yours included, facts is locked up in a considerable number of programs that don't talk neatly. The thought of application reuse is beautiful to administration as a result of big parts of IT budgets are typically tied up in simply preserving latest techniques, according to Peter Linkin, senior director of integration product marketing at BEA methods. That leaves little to spend on new methods as enterprise wants alternate.

    "tons of the pastime in SOA is coming from managers," Linkin spoke of. "we have been listening to from consumers for a while now that the splendid majority of budgets—70 to 90 percent—are tied up in maintaining existing methods."

    on the other hand, be sure to stress to management that the advantages from an SOA doubtless might not be instant. for most agencies, the return on funding can be long-term, after you beginning to reuse services and statistics extra efficiently. it is the actual company reason to begin to work with SOA concepts now: to live aggressive long-term.

    Industries moving first to SOAs are folks that typically lead in IT—the monetary capabilities sector, for example, which tends to spend heavily on IT. The insurance trade, according to Ron Schmelzer of ZapThink, is additionally leading the can charge. it truly is as a result of large insurance groups are sometimes running high priced legacy methods. That makes them wanting to undertake a value-useful solution to get at the business tactics, statistics, and other helpful assets locked up in these methods. Legacy is for that reason "a sweet spot for this technology," in line with Schmelzer. As those agencies are trying to reuse latest investments to store cash, he stated, SOAs and net features present an glaring answer.

    "there is lots of first rate short-time period ROI" on SOA efforts that integrate present mainframe functions, portal structures, application servers, deployed company logic, and listing programs, Schmelzer talked about. and people projects can yield a fairly quick return—"in some cases, a few months."

    Assessing supplier PositionsAlthough part of the promise of SOA is a cross-platform exchange that enables competing technologies comparable to Java and .web to speak, that doesn't mean items and structures may not count. As at all times, providers are jockeying for position, touting their items because the most advantageous answer on your corporation.

    Sorting between differing vendors will also be hard, and here is the place which you could aid good administration, who should be at the least partly counting on relied on in-condominium architects and developers for suggestions as they head down the path to SOA. Of direction, some thing applied sciences you might be operating now will likely affect your future course. but an outstanding knowledge of web capabilities and SOA is so that you can leverage your heterogeneous environments—in case you've been a Java store however see benefits in a Microsoft answer, that you would be able to extra easily combine .net into your current ambiance.

    One element you are looking to be careful about is making bound you select carriers and items participating within the development of net functions specifications. organizations reminiscent of BEA, IBM, and Microsoft had been heavily worried in specifications boards from the starting, so it truly is a good indication of future interoperability.

    in terms of tools, that you may reassure management that desirable companies are now together with the basic equipment necessary to create SOA environments of their items. J2EE items from BEA, IBM, and Oracle, as well as Microsoft's visible Studio .net, as an instance, include the necessary building ambiance and net functions calls, together with XML creation ability.

    based on ZapThink, providers' offerings fall into two tough classes of choices, and also you might need to weigh your method based on that. First is the software-centric method, which ZapThink says works most beneficial in much less heterogeneous environments with a smaller set of applied sciences. IBM, Microsoft, BEA, sun Microsystems, and Oracle all offer products that fall during this class.

    The other strategy is based round message queuing and asynchronous messaging, or what's known as an commercial enterprise service Bus (ESB). It uses a greater message-oriented method to connecting systems, Schmelzer talked about, and consequently will also be low-budget. Smaller gamers comparable to Sonic utility are competing here, however Microsoft's, BEA's, and IBM's items also fall into this area.

    some thing dealer you opt for, maintain an in depth eye on specifications. it truly is the suggestions of David Linthicum, CTO of Grand important Communications, a company making a large play in web features and SOAs. "americans deserve to be careful about lock-in," Linthicum talked about. "watch out for proprietary interfaces and extensions that go past the average. make certain they could work and play with other technologies."


    S90-18A Fundamental SOA Security

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    Fundamental SOA Security

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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.


    ABN AMRO’s Service Oriented Architecture 2.0 | killexams.com real questions and Pass4sure dumps

    By Piethein Strengholt

    When I published the ABN AMRO’s Integration Architecture article, I quickly mentioned ‘Service Orientation’ as one of the three integration patterns of our DIAL integration architecture. Spending only 10 lines about this pattern isn’t fair, since within ABN AMRO we have an entire program running named ‘SOA 2.0’. With this blogpost I want to dive a little bit deeper into our vision at how ABN AMRO sees the future ‘Service Oriented Architecture’.

    Since SOA is a widely used concept, let’s start with my understanding of Service Oriented Architecture (SOA) first:

  • SOA is about exposing ‘functionality’ through web services. Some people call these Services, while others like to use the terminology API’s.
  • SOA is about abstraction. Applications (and complexity) disappear towards the background and instead business functionality is provided.
  • SOA is about allowing applications to communicate using a form of standard structure (REST based).
  • SOA is about exchanging data, but also about processes and functions.
  • SOA is about synchronous communication (wait for something to finish in order to continue) and asynchronous communication (don’t wait).
  • SOA is about decoupling, allowing applications to independently change without the need to change all other applications.
  • About the application decoupling it is good to mention that ‘data coupling’ is most often unavoidable. Services often rely on other services’ data, e.g. account information or customer information requires many other services to pull data out of systems. Since there is no workaround for not having the data, there’s always some form of coupling.

    Old situation

    Before we look at our future state architecture and initiatives, it’s good to go rewind back to the point where our SOA journey started. Our SOA journey started just like many other enterprises, aiming to make the IT landscape more flexible, rationalize systems and provide real-time communication.

    During that time no enterprise integration platforms were available, so we started to build one ourselves. It is comparable with building ‘one large system’. The large system uses a single data model, has many shared libraries, takes care of security, does processing & orchestration, does data integration and many other things.

    Somewhere down the line the concept of an Enterprise Service Bus (ESB) was introduced. The ESB promoted our agility and flexibility because it enabled us to more quickly deliver services using the adapters and support for protocol conversions. On the other hand, it had to work and comply with the ‘one large system’, so all services delivered by the ESB had to comply with the (canonical) data model, processing models, security models, etc.

    SOA 1.0

    Meanwhile doing SOA we also noticed that the world was changing. Concepts like API Economy, Open Banking and PSD2 were introduced, applications started equipping modern (REST) interfaces on the fly and the agility became much more important. Our ‘optimize for re-use principle’ came under a lot of pressure. Consequently, we had to come up with a new approach. Based on our experiences and observations we concluded that a refreshment regarding SOA was needed.

    Service Orientation Architecture 2.0

    Agility of our internal ecosystem: One of the cornerstones of our new SOA 2.0 model is that it had to improve the agility. Transformation of enterprise architecture is an ongoing process. Eliminating dependencies and removing complexity is a crucial part of this larger transition. Breaking up the monolith was unavoidable.

    This also led to an important decision that we had to let go the single canonical model and to replace it with the concept of multiple canonical evolving at the same time.

    Breaking up the monolith also resulted into another important decision. We had to give back the responsibility of the business logic, execution of the process, persistency of data, etc. With a decentralized model, domains can evolve at their own speed, without holding up other domains. Principles such as ‘Optimize as close as possible to the data’, ‘Exposing functionality instead of systems’ and ‘Keep domain logic in your domain’ were set.

    Connecting to other ecosystems: With the modernization of applications using modern decoupling patterns (REST) we also had to look critical at our current integration platform, the Enterprise Service Bus (ESB). In cases of no heavy lifting, is the ESB always required? A lightweight API Gateway is more attractive, since it doesn’t have the overhead, while at the same time giving flexibility of decoupling, control and security. As a result, we introduced the API Gateway into our architecture as an enhancement for the future Service Oriented Architecture. The API Gateway also has another benefit. Cloud, (SAAS, PAAS) offerings and the external data consumption and distribution will push the connectivity even further. Having a point of control over all APIs makes sense. The API Gateway is expected to have an important role in our architecture. Eventually the API Gateway will become more important than our ESB since most of all communication is expected to be modern. Consequently, we positioned the ESB solely to solve the problem of legacy system modernization and heavy integration. To complete the modernization and comply with the demands of data consumption we set additional principles such as: ‘Services are built for the consumers’ and ‘Simplicity and usage of community modern standards’.

    SOA 2.0

    In our architecture you can see a clear split between ‘internal’ consumers and ‘external’ consumers. The language we speak internally is under our control, but externally this isn’t often the case. The ‘format’ we use for internal communication differs very much from the ‘formats’ that are being used in the outside world. This results in an additional translation when re-using internal services. Therefore, we positioned an External API Gateway in our architecture to do this external translation and to cope with the additional security measures that are needed when exposing externally.

    To finalize our SOA architecture, we distinguished our ‘internal’ consumers into AAB Applications and Channels. AAB Applications typically consume direct, but for our Channels environment it is completely different ball game. Channels is where communication happens directly with our customers. It’s about human interaction, web & mobile experience and machines (Bots, Alexa, IFTTT, etc.). To offer the best experience additional components are needed, such as entitlement checks, request handling and validation, state management, caching, etc. These components are part of the Channels domain and are expected to play nicely with our API Gateway.

    Wrap up

    Service Orientation Architecture 2.0 is a refresh of our SOA strategy. It is worth sharing that the fundamentals of SOA remains the same, so we’re not changing the SOA philosophy. Mainly the techniques have changed.

    By having clearer responsibilities, using modern patterns and standards we believe to have a more flexible and scalable architecture. The Service Orientation Architecture 2.0 is for ABN AMRO the reference architecture for our architects, developers, engineers and solution designers. It will enable them to deliver the highest value for the business and our customers.

    SOA 2.0 is part of our DIAL architecture. DIAL stands for Digital Integration & Access Layer, which is our reference architecture for Ecosystem integration. We recently ‘open sourced’ a large part of this architecture and by sharing our SOA 2.0 reference architecture you should have a pretty good insight in how we look at Data Management & Data Integration.

    About the author(s):Piethein Strengholt, Technology ArchitectPiethein is Technology Architect for ABN AMRO. He is part of a high performing team of technology enthusiasts with a passion for the latest developments and trends. Are you interested to join me on this journey? Please let us know!

    Big heads up also for Maarten Spit, Peter Goosen, Michel Kroon and Wim Janse.


    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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    SOA S90-18A Exam (Fundamental SOA Security) Detailed Information



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