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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 : December 7, 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 primary changes between microservices and SOA | killexams.com Real Questions and Pass4sure dumps

for many architects and builders, provider-oriented architecture is the software mannequin they're most skilled...

with. nonetheless it's possible that management will demand a shift to microservices. As such, SOA developers may still consider the ameliorations between microservices and SOA and the way to make the transition from the monolith as easy as feasible.

Core ideas in microservices and SOA

There have at all times been two dimensions to the thought of SOA. at the conceptual level, SOA is a model for constructing functions by way of assembling add-ons that will also be shared among functions and hosted independently. at the implementation degree, SOA developed a series of requirements to define utility traits and interfaces, broker access and provide security, including simple Object entry Protocol and internet functions Description Language.

many of SOA's underlying ideas are also core concepts in microservices. however, microservices practice these ideas throughout the lens of the web, the web and leisure interfaces.

well-nigh each construction team is customary with rest and programming net-primarily based functions, in order that they already have the basic abilities to deal with microservices building. The focus of implementation simply should shift to the net, so that it will contain adapting to some new methods.

The time period microservices will also be a supply of bewilderment for some former SOA builders. This time period may additionally conjure up the image of tons of or hundreds of features that encompass a pair strains of code that can be referred to as upon as necessary. any such microservices framework would very nearly absolutely generate significant delays because of message transfer latency. Former SOA practitioners should still take into account how SOA's componentization design ideas are equally beneficial for microservices.

the place microservices and SOA range

The difference between stateless and stateful habits is likely to be the most confounding challenge for SOA builders to hold close. One basic rule is that make sure you by no means keep data inside a microservice. That observe would limit the capability to scale under load or change a failed service. if you need to maintain statistics or context throughout dissimilar circumstances in a microservices structure, keep the statistics either with the calling software and ship it to the microservice when or not it's known as, or get it from a returned-end database. Design microservices so that calling them with the equal enter will always generate the same output.

Microservices vs. monolithic architecture

there is also a fundamental difference in how SOA functions and microservices are used by way of an utility. SOA services perpetually seem as tactics or features, meaning they're designed to emulate in the community written utility accessories. as an example, when an SOA service is needed, you name it. in contrast, microservices are not known as however are a aid you draw from. When they're utilized in adventure processing, as an example, they're brought on via an event in place of explicitly known as. ultimately, microservices are typically stateless, the place most SOA components are stateful.

Addressing security and governance concerns is additionally extra nuanced in microservices. Many businesses have developed standardized methods for safety, identification administration and governance round SOA. however, most businesses will not have any standardized how you can contend with security and governance considerations in microservices. Architects moving to microservices have to devise learn how to address these needs and then make sure they're standardized throughout the total IT ecosystem. in the event that they aren't, modifications in safety and id methods will stall deployment. It additionally means that, when alternatives for brand new functions are identified, there is a possibility of hidden incompatibilities. happily, there are lots of proven token-based mostly programs for id management and protection for microservices. Standardizing on one will preserve open microservices use without compromising protection and governance.

If the cloud is the longer term, then microservices are too.

another enviornment the place microservices and SOA range is in organizing workflow. SOA functions are sometimes linked with an enterprise service bus (ESB), where execution is guided by means of company process management (BPM) language. Microservices are called explicitly from purposes, so the sequencing of process steps is executed on the utility stage. also, remember that microservices are reusable components. They don't seem to be huge chunks of functions, which is what ESB and BPM languages guide. despite the fact, there are programming design patterns that supply an identical method orchestration the use of microservices.

Interfaces of any form require some variety of records alternate mechanism. With SOA, the typical mechanism is XML, which can also be flexible. youngsters, some builders locate XML verbose and complex. With microservices, which you can nevertheless use XML, however many builders gravitate towards JSON as a result of they discover it less difficult to work with. if your team is very regularly occurring with XML and never Java, you could use XML. however JSON is optimum in most situations, and the transition should still now not be difficult for most SOA programmers.

Are microservices value it?

The most effective question that continues to be is whether or not SOA developers really want to undertake microservices recommendations in any respect. There is still a lot of SOA construction happening, and many big and trendy functions are nevertheless in keeping with SOA from both a conceptual and implementation point of view. however the cloud encourages a dynamic and elastic vision of utility add-ons, where scalability and resiliency are extra effective than composability alone. Cloud models are more suitable suitable for element interfaces which are lightweight and capable of being fashioned dynamically at runtime, which is the ultimate use for a rest-based microservices structure.

If the cloud is the long run, then microservices are too. SOA isn't going to disappear, however's additionally unlikely to be adapted to these new requirements. software practices are relocating to microservices, so SOA practitioners may still be organized to head there as neatly.


SOA basics | killexams.com Real Questions and Pass4sure dumps

This chapter from 100 SOA Questions answers the questions, what's SOA, is SOA an architectural style, what are basic constructs (the DNA) of SOA, what is the difference between an internet carrier and an SOA provider and what makes a undertaking an SOA implementation?

This chapter is from the publication 
  • Delusions, error, and lies are like massive, gaudy vessels, the rafters of which are rotten and worm-eaten, and those that embark in them are fated to be shipwrecked.
  • —Buddha
  • carrier-oriented structure (SOA) is defined in a few approaches, however no longer all definitions are equal, and never all definitions are comprehensive. as a substitute of simply proposing one more definition of SOA, this chapter describes the primary building blocks of SOA and appears at the cost proposition of SOA from key stakeholder perspectives. anyway masking the primary constructing blocks of SOA, its DNA, and the price propositions of adopting SOA and its highest quality utility, this chapter describes what makes an implementation an SOA deployment. particularly, this chapter addresses here questions:

  • what is SOA?
  • Is SOA an architectural vogue?
  • What are primary constructs (the DNA) of SOA?
  • what is the difference between an internet carrier and an SOA carrier?
  • What makes a assignment an SOA implementation?
  • 1. what's SOA?

    a lot of carriers, software providers, equipment integrators, architects, authors, analysts establishments, and necessities bodies give definitions of SOA. The definitions of SOA are different. Most are complementary and don't conflict with each and every other. SOA has a variety of definitions since the definition is commonly tuned to a particular viewers, as explaining SOA to a CEO is diverse from explaining SOA to a programmer. The term carrier orientation is regularly used synonymously with SOA, however similar to SOA it has a big range of interpretations. carrier orientation is broader and represents a means of brooding about functions within the context of business and IT. This e-book makes no distinction between SOA and service orientation and in some circumstances may additionally use the two phrases synonymously.

    An agreed-upon definition for SOA eludes the trade. anybody studying Wikipedia's definition page for SOA will see the challenges of trying to benefit consensus on an SOA definition. requisites our bodies, the OASIS group, and the Open group have provided complementary however different SOA definitions. introduced with a clean sheet of paper, an artist sees a canvas. A poet could fill it with verse. An engineer seizes the possibility to make a paper airplane. kids can also see it as a future pile of spit wads. SOA is that clean sheet of paper.

    To the manager counsel officer (CIO), SOA is a experience that promises to reduce the lifetime cost of the software portfolio, maximize return on investment (ROI) in each software and know-how supplies, and in the reduction of lead times in delivering solutions to the business.

    To the company executive, SOA is a collection of features that can be exposed to their purchasers, companions, and other materials of the firm. company capabilities, function, and enterprise good judgment can be mixed and recombined to serve the wants of the enterprise now and the following day. applications serve the enterprise as a result of they're composed of functions that can also be directly modified or redeployed in new business contexts, enabling the enterprise to right away reply to changing consumer needs, business alternatives, and market conditions.

    To the business analyst, SOA is a method of unlocking value, as a result of enterprise techniques are no longer locked in application silos. functions no longer function as inhibitors to changing company wants.

    To the executive architect or business architect, SOA is a means to create dynamic, highly configurable and collaborative applications built for alternate. SOA reduces IT complexity and rigidity. SOA becomes the solution to stop the gradual entropy that makes purposes brittle and difficult to trade. SOA reduces lead instances and charges as a result of decreased complexity makes editing and checking out applications more straightforward when they are structured using services.

    To the IT architect, SOA is the architectural solution for integrating diverse programs by way of providing an architectural vogue that promotes free coupling and reuse. Many IT architects feel they've viewed this vogue earlier than with past architectural initiatives corresponding to DCE, the distributed Computing atmosphere, and CORBA, the normal Object Request broking service structure.

    To the developer, SOA is a programming model or paradigm the place web features and contracts turns into a dominant design for interoperability. it's an internet carrier when it uses an internet service Description Language (WSDL) or equal specification for describing the service. net features enable agencies to speak counsel, the use of messages, devoid of intimate skills of each different's IT systems.

    providing on the guarantees of SOA (enhanced enterprise agility, maximized ROI, decreased IT complexity and tension, decreased prices, reduced lead times, reduced risk, new alternatives to bring price, elevated participation in value networks, and incremental implementation) requires you are taking a holistic view of SOA. If we restrict the view of SOA to a single stakeholder (e.g., IT architect, developer, or company analyst) the benefits will no longer accrue as a result of SOA then simply becomes one in an extended checklist of overhyped applied sciences in place of a novel method to building flexible business options.

    2. Is SOA an Architectural fashion?

    SOA is regularly considered as an architectural vogue that has been around for years. determine 1.1 suggests the architectural fashion of SOA. in this scenario, a service purchaser invokes or uses a service. The provider customer makes use of the service description to gain indispensable advice in regards to the company carrier (e.g., account service) to be consumed. The provider description offers the binding suggestions so the purchaser can connect to the provider, and the description identifies the a lot of operations (e.g., open or close account) accessible from the provider carrier. A broking service can also be used to find the provider the use of a registry that residences counsel concerning the service and its area.

    In figure 1.1, it is difficult to verify how the structure fashion of SOA allows the strategic advantages of SOA, reminiscent of decreasing the lifetime cost of an utility or bringing faster time to market or making purposes resilient to alternate. SOA as an architectural trend commonly makes an SOA project fully an IT exercise the place the strategic enterprise advantages of SOA not become the center of attention or measured results. benefits of method flexibility, time-to-market discount rates, reduce expenses, and others may also be accomplished with SOA, but handiest if we holistically adopt all stakeholder views of SOA and its utility and pursue SOA adoption for that reason. When pundits, architects, consultants, or executives define SOA as a pure technology play or as totally an architectural fashion, they relegate it to the realm of IT science projects, overhyped technologies, and a advertising method in place of a novel approach to building bendy business options.

    An understanding of SOA is more advantageous with the next question and answer. via searching at the SOA building blocks of SOA, you can gain a fuller figuring out of what SOA is and the way to realize its promised benefits.

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

    essentially the most basic assemble or building block of SOA is a service. utility engineering through the years has advanced from procedural to structured programming to object-oriented programming to part-primarily based building and now to provider oriented. figure 1.2 illustrates the diverse degrees of abstraction from objects to features. each evolution of abstraction builds on the outdated, and SOA embraces the finest practices of object and component development.

    to look architectural trend of SOA, discuss with figure 1.1. That illustration indicates the simple constructs of SOA, such because the carrier client and the service issuer and their relationship. The client invokes a service, the enterprise functionality, with the aid of contract. The provider of the provider defines the contract as a carrier description. An intermediary, such as a broker, makes use of a registry to discover or seek posted features. service buyer, carrier provider, service description, carrier broking service, and a registry are all part of the DNA of SOA.

    A service in SOA is the logical, self-contained business function. features in SOA have right here attributes:

  • Stateless: SOA services neither be aware the last thing they have been asked to do nor do they care what the subsequent is. features aren't dependent on the context or state of alternative services, most effective on their performance. talking on the mobile is stateful, whereas posting a letter is stateless. The everywhere internet provides a brilliant example, where each request from a user for an internet web page or URL results within the requested pages being served, however without the internet server remembering the request later. each and every request or communication is discrete and unrelated to requests that precede or follow it.
  • Discoverable: A carrier need to be discoverable with the aid of capabilities consumers of the service. in any case, if a carrier isn't popular to exist, it's unlikely ever to be used. services are published or exposed by means of service providers in the SOA provider listing, from which they're discovered and invoked by carrier consumers.
  • Self-describing: The SOA provider interface describes, exposes, and gives an entry aspect to the carrier. The interface includes the entire advice a service buyer needs to find and fix to the service, without ever requiring the customer to take note (or even see) the technical implementation particulars.
  • Composable: SOA services are, by means of nature, composite. They can be composed from different services and, in turn, can be mixed with different services to compose new business options.
  • free coupling: free coupling makes it possible for the concerns of software facets to be separated into unbiased items. This separation of challenge offers a mechanism for one service to name an additional devoid of being tightly bound to it. Separation of considerations is done by organising boundaries, where a boundary is any logical or physical separation that delineates a given set of tasks. as an instance, an account carrier has open account, authorization, and audit features representing delineations of tasks and three separations of issues.
  • ruled by means of coverage: functions are constructed by way of contract. Relationships between functions (and between capabilities and service domains) are ruled by using guidelines and service-degree agreements (SLAs), promotion procedure consistency and reducing complexity.
  • impartial location, language, and protocol: services are designed to be place transparent and protocol/platform independent (often speakme, attainable through any licensed consumer, on any platform, from any area).
  • additionally, services in a provider-oriented structure typically have right here traits:

  • Coarse-grained: capabilities are usually coarse-grained enterprise capabilities. Granularity is an announcement of useful richness for a provider—the greater coarse-grained a provider is, the richer the function provided by using the carrier. Coarse-grained features reduce complexity for system developers by way of limiting the steps essential to satisfy a given company feature, and they in the reduction of pressure on device resources through limiting the "chattiness" of the digital conversation. functions by means of nature are coarse-grained as a result of they embody a big set of performance; the add-ons that comprise applications would be pleasant-grained. in a similar fashion, inside an application, a carrier corresponding to "get account suggestions" (which returns identify, account quantity, and tackle) could be described as coarse-grained, whereas a provider to "get account quantity" may well be described as exceptional-grained.
  • Asynchronous: Asynchronous communication is not required of an SOA provider, but it surely does increase gadget scalability through asynchronous habits and messaging techniques. Unpredictable community latency and excessive communications charges can slow response times in an SOA ambiance, because of the distributed nature of services. Asynchronous behavior and messaging enable a service to difficulty a service request and then proceed processing unless the carrier company returns a response.
  • considered from the exact down, SOA contains the following constructs, as illustrated in figure 1.3: consumer, enterprise tactics, services, add-ons, assistance, rules, and policies. buyers permit invocation or composition of capabilities at the purchaser layer via social application, mashups, company methods, or different systems. company strategies characterize the flows of actions required to comprehensive a company technique; they are compositions of services targeted to obtain company dreams. services are the main structuring element required via a carrier buyer and are offered by using the service provider. functions present functionality and satisfactory of service, each of which are externalized within carrier descriptions and guidelines. functions may also be composed of different services, thus making them composite features. components realize no longer best the functionality of the services they expose but also be certain their best of provider. assistance flows between the layers (as an example, client, technique, and service) and within a layer. lastly, rules and policies exist for services, accessories, and flows.

    although objects are illustrated in determine 1.3, the word object doesn't suggest an implementation of object orientation, because the object can quite simply be a procedural subroutine applied in a large number of languages as effortlessly as it will also be carried out in a object-oriented programming language. SOA ought to have functions and components that know the functions. procedures or flows may additionally string functions together to fulfill a step or pastime of a enterprise process. for instance a switch of dollars service may additionally string together each a debit and credit score account carrier.

    there is also a technology view of SOA. technology makes it possible for SOA, makes it efficient, and optimizes the implementation, however SOA is not defined via the technologies chosen for implementation. as an alternative, SOA is defined by way of featuring a uniform ability to offer, discover, interact with, and use capabilities (services) to supply favored effects in step with measurable expectations.

    The foremost applied sciences associated with SOA consist of enterprise-concentrated equipment, software building tools, and middleware technologies. determine 1.4 illustrates the simple expertise building blocks for SOA. tools are required for SOA addressing design-time and runtime eventualities. business stakeholders use business-concentrated equipment for modeling and evaluation of company strategies and flows, and they're going to also use enterprise pastime monitoring expertise to benefit insights into business efficiency of approaches and workflow. IT practitioners use a set of equipment for development of enterprise purposes and for managing the operating environment addressing integration, monitoring, and security.

    The DNA of SOA will most likely be extra investigated and defined by way of specifications groups actively involved in defining an SOA ontology. for instance, see www.opengroup.org/tasks/soa-ontology/. Such an ontology will tackle SOA key ideas, including services, service contracts, provider interfaces, composition (orchestration, choreography, and collaboration), approaches, carrier compositions, policies, and movements. each and every of those makes up the DNA of SOA.

    4. what's the change Between an internet service and an SOA provider?

    The difference between company features or SOA functions versus an internet service is not commonly articulated, and a lot of equate both as being the same. SOA services may also be realized as internet functions, but no longer all net features are equal to SOA features. internet services symbolize the use of both a printed commonplace and a set of technologies for invocation and interoperability. SOA services are services that fulfill a key step or undertaking of a business method and may be described as enterprise capabilities and are often uncovered as web features.

    determine 1.3 illustrates both an SOA service and a web provider. The photo suggests the difference between SOA and web capabilities at runtime (i.e., implementation degree) and at design time. The internet provider is illustrated on the correct aspect of determine 1.5, notably the web services Description Language (WSDL) and its attributes similar to port forms and operations. The attribute that makes it an internet service is using WSDL or equivalent.

    In design, we identify and specify a service that offers the design, or we identify and specify interfaces that consist of formula standards. The aggregate of the definition of the system and the interface at design time is what we refer to as a service from an SOA point of view. Use instances will also be used to seize the functional requirements for a provider. determine 1.5 contrasts the transformations between a carrier in SOA and an internet service. both SOA services and internet capabilities are part of the DNA of SOA.

    In an SOA, business strategies, actions, and workflow are damaged down into constituent functional elements known as services. They may also be accessed and used at once by applications, or they can also be mixed and matched with other features to create new business capabilities. company functions or SOA features are reusable company capabilities. Examples in banking encompass open account or change tackle. For transportation, it should be would becould very well be get reservation or cling reservation, and with loan processing, get personal loan, observe for personal loan, and replace address are examples of enterprise capabilities. enterprise methods are additionally key constructs of SOA, a part of its DNA.

    5. What Makes a undertaking an SOA Implementation?

    The deployment of functions makes a project an SOA implementation, the place a service is defined within the previous reply as a web service or an SOA service. the use of the internet service Description Language (WSDL) or equal makes a carrier an internet service. An SOA provider need to satisfy the standards described in the reply 2; specifically, an SOA carrier should be stateless; discoverable; self-describing; composable; loosely coupled; governed; and independent of vicinity, language, or protocol. this is, the use of features alone makes the assignment or implementation an SOA implementation. besides the fact that children, an SOA implementation may additionally not accrue the favored advantages of SOA around can charge mark downs, reuse, time to market, or flexibility.

    functions can have distinct degrees of maturity. as an instance, functions may also be advert hoc of their design and implementation where a WSDL façade is applied to make feature attainable to other systems or purposes. functions can also be architected where provider modeling and governance are used to maximise carrier reuse.

    The implementation of SOA applied sciences and not using a deployment of 1 or extra capabilities may even be defined as an SOA implementation. this may be peculiar as a result of middleware and infrastructure implementations (e.g., a registry or business service bus) can be implemented in conjunction with the deployment of features.

    just as features have distinct tiers of maturity, so do SOA adoptions inside a company. Some SOA adoptions require a software of projects to tackle a journey of expanding maturity to achieve strategic SOA desires of building systems for exchange, infusing flexibility as an attribute of systems, or decreasing the lifetime expenses of applications and infrastructure. during this case, the program contains a collection of SOA projects that incrementally carry the maturity of SOA in an organization and alongside the style permit the realization of the strategic SOA merits.

    regularly, on account of overselling of SOA, firm leaders, managers, and executives wrongly consider that the benefits of SOA immediately accrue when an SOA implementation happens. SOA has numerous and diverse definitions, and hence its implementations are equally dissimilar. So, companies in quest of to accrue any of the promised merits of SOA ought to do greater than focal point on SOA implementations. it's, each and every expected benefit of SOA requires a distinct degree of SOA maturity. as an example, if the goal is simply to cut back the cycle time of a business procedure that deals with external companions, exposing net features can be the simplest integral SOA adoption. however, if the enterprise purpose is to in the reduction of time to market for new items, this requires a broader adoption of SOA that addresses reusable functions, structuring of applications using capabilities, improving integration the usage of functions, and aspects of SOA governance to address service sharing, funding, and possession.


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

    the way to explain SOA to Your CIO

    SOAs will assist trade how business and IT work together. it'll take time, though. meanwhile, here's what you need your CIO to know so that your business can movement in the appropriate path.

  • via Linda Briggs
  • 11/01/2004
  • You comprehend the way it works with the newest buzzword. The day is coming should you'll run into somebody from appropriate administration in the elevator, or in the hallway after a meeting, and he or she will casually ask, "So what are we doing at the present time about SOAs?" it is when you wish to be able with just the appropriate amount of suggestions to assist a true-stage company executive keep in mind why a service-oriented architecture (SOA) is really useful and anything you are well-located for however it may not remedy every IT difficulty. To assist you explain that and more, right here's a primer on the strategic concepts and company advantages in the back of SOA.

    For starters, some short aspects on SOAs: As practically every person is fond of pointing out, provider-oriented architectures had been round for a very long time. it's a reasonably basic idea, basically: to standardize software capabilities, or features, so that a lot of numerous applications and technologies can share them—each inner and out of doors the enterprise. The unfastened coupling of systems and records that is the hallmark of SOAs helps tackle what has develop into a huge difficulty in company: advanced, rigid programs that do not share information neatly and can't be reconfigured right now to meet altering enterprise wants.

    "when you are your firm, you probably have replica methods and tactics with loads of copying and pasting from one equipment to an extra," according to Dave Mendlen, Microsoft director of web features advertising. "for example, there may be lots of funding in CRM techniques, however [companies] haven't gotten lots of benefit from it. [With an SOA], that you may now leverage that funding and get reuse at a macro level."

    Predecessors comparable to CORBA and EDI on no account quite delivered on their premise of everyday interoperability as a result of they're tightly coupled, and since the technical community hasn't been capable of agree on everyday standards. With XML and web services in region, and extra key standards falling into line all the time, carrier-oriented architectures can finally birth to meet their promise.

    In explaining all this to your CIO, you will want to be cautious about distinguishing between web capabilities and service-oriented architectures (see "SOA: Debunking 3 common Myths"), based on Jason Bloomberg of ZapThink, an analyst enterprise that makes a speciality of XML, net features, and SOAs. "they're different things and have distinctive implementation patterns and different quotes of return. net services are more tactical, solving integration issues; SOAs are extra strategic and supply better business utility." net capabilities are one of the parts, in different phrases; SOAs are the connections between them.

    That leads to the lots-repeated promises of SOA—loosely coupled services and versatile software leading to agile enterprise processes. that is all smartly and good, but from a CIO's element of view, you need to be sure to spotlight the business case. after all, here's an trade that sees hype round new applied sciences come and go like airplanes into O'Hare overseas. happily, with SOA, there are a whole lot of true enterprise benefits forward.

    Gauging the enterprise ReturnsOne key improvement to stress is the imaginative and prescient of reusing latest systems and data. At many agencies, probably yours protected, statistics is locked up in a considerable number of methods that don't speak smartly. The idea of software reuse is fascinating to management because huge parts of IT budgets are customarily tied up in comfortably conserving existing systems, according to Peter Linkin, senior director of integration product marketing at BEA programs. That leaves little to spend on new techniques as enterprise wants change.

    "an awful lot of the hobby in SOA is coming from managers," Linkin observed. "now we have been listening to from consumers for ages now that the amazing majority of budgets—70 to 90 p.c—are tied up in retaining existing techniques."

    however, make sure to stress to management that the benefits from an SOA probably might not be immediate. for many organizations, the return on funding can be long-time period, after you beginning to reuse services and data extra efficiently. that's the actual enterprise rationale to start to work with SOA concepts now: to dwell competitive lengthy-term.

    Industries relocating first to SOAs are folks that usually lead in IT—the monetary services sector, as an instance, which tends to spend closely on IT. The coverage trade, in keeping with Ron Schmelzer of ZapThink, is additionally leading the cost. that is as a result of huge insurance businesses are often running high priced legacy programs. That makes them wanting to adopt a cost-effective method to get at the company methods, records, and different valuable belongings locked up in those methods. Legacy is as a consequence "a candy spot for this know-how," based on Schmelzer. As these groups try to reuse existing investments to shop funds, he observed, SOAs and internet capabilities present an obtrusive answer.

    "there's lots of respectable short-time period ROI" on SOA efforts that integrate current mainframe purposes, portal buildings, software servers, deployed enterprise good judgment, and listing systems, Schmelzer said. and people tasks can yield a reasonably short return—"in some cases, a couple of months."

    Assessing vendor PositionsAlthough part of the promise of SOA is a cross-platform trade that makes it possible for competing applied sciences reminiscent of Java and .web to speak, that does not imply items and structures might not be counted. As always, companies are jockeying for position, touting their products because the ideal reply on your firm.

    Sorting between differing providers will also be hard, and here is where you can assist appropriate management, who should be at the least partly relying on depended on in-condominium architects and developers for tips as they head down the route to SOA. Of route, something applied sciences you're operating now will probably affect your future route. however a good advantage of internet services and SOA is for you to leverage your heterogeneous environments—in case you've been a Java store but see merits in a Microsoft solution, that you can greater simply integrate .internet into your present ambiance.

    One element you are looking to be careful about is making bound you select providers and products participating within the building of internet services standards. organizations akin to BEA, IBM, and Microsoft had been heavily worried in requirements boards from the beginning, so it is an excellent indication of future interoperability.

    when it comes to tools, which you could reassure administration that true providers at the moment are including the basic tools vital to create SOA environments in their items. J2EE products from BEA, IBM, and Oracle, as well as Microsoft's visible Studio .web, for example, contain the essential building environment and internet capabilities calls, along with XML advent skill.

    based on ZapThink, providers' choices fall into two tough classes of choices, and also you could wish to weigh your approach in accordance with that. First is the software-centric strategy, which ZapThink says works most excellent in much less heterogeneous environments with a smaller set of applied sciences. IBM, Microsoft, BEA, solar Microsystems, and Oracle all offer items that fall during this class.

    The other strategy is primarily based around message queuing and asynchronous messaging, or what's called an enterprise provider Bus (ESB). It uses a more message-oriented method to connecting programs, Schmelzer observed, and therefore may also be affordable. Smaller avid gamers akin to Sonic software are competing here, youngsters Microsoft's, BEA's, and IBM's products also fall into this space.

    whatever supplier you choose, maintain an in depth eye on requisites. it is the counsel of David Linthicum, CTO of Grand valuable Communications, a corporation making a big play in internet features and SOAs. "individuals need to be careful about lock-in," Linthicum mentioned. "watch out for proprietary interfaces and extensions that go past the commonplace. be certain they could work and play with different technologies."


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    Fundamental SOA Security

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    5 basic SOA principles that still apply to microservices | killexams.com real questions and Pass4sure dumps

    Cloud computing and virtualization paved the way for the emergence of microservices, but neither caused the demise...

    of certain SOA principles. To see where both align, take a step back from the details of implementation, and check out the benefits.

    The mission of SOA

    Service-oriented architecture (SOA) development addressed the onrush of true networked software. For 50 years, developers typically built software from modules that were usually a part of a larger monolithic application. Improvements in networking brought forth the possibility of distributing, scaling and redeploying components as needed.

    The basic SOA model aimed to capitalize on these networking advancements in order to distribute software components, locate components through a directory service and connect them without sacrificing security or reliability. Components could now provide services to other components and applications, exchange requests and responses over a network, and use an API broker to find one another.

    Componentization

    SOA and microservices share the concept of componentization. Both architectures presume that applications will divide into components and that a network connection will link those components.

    Componentization enables work to spread across multiple servers, which improves performance. It also facilitates team development since components join at a common, well-defined interface.

    If we reinvented SOA today from scratch, we'd almost surely invent microservices instead.

    SOA also established the concept of network coupling, which focuses on the ability for an architecture to treat a component accessed via a network connection as though it was a local component. SOA implementations typically achieved this through an evolved version of the old remote procedure call, known as Simple Object Access Protocol.

    By contrast, microservices use the web-oriented REST model. This difference simply reflects changes in programming practices brought about by the internet. REST calls the services resources, where SOA calls them objects, but the two are similar.

    Integration and discovery

    Network coupling is also associated with the notion of discovery and late binding. A component doesn't integrate at development time -- which would be called early binding -- but rather connects at runtime, which entails a discovery process for the interface to the component, known as the API.

    With SOA, the discovery process links to the Universal Description, Discovery and Integration (UDDI) directory, while microservices use an API broker for the same mission. This integration and discovery model makes it easy to change a service without interfering with the rest of the application or related applications.

    Service independence

    Another one of the SOA principles that still applies in microservices is language independence. Services don't need to use the same programming language, middleware or OS as long as they support the common API.

    Microservices are a bit more independent of each other, since the RESTful APIs only use common web-related tools and programming conventions. This implementation independence helps with code reuse and helps disperse work across the widest variety of servers.

    Service classification

    SOA principles introduced the notion of different classifications of services. Broadly, services can support a business function, such as order entry, or a platform function, like journaling for compliance logging. Some SOA documents actually define four specific service classes, further dividing the functional side of the model.

    Microservices also follows this service classification principle. However, SOA services are typically more explicit, whereas microservices typically classify services by the features they provide rather than how they're invoked and structured.

    Orchestration

    Another SOA concept that remains with microservices is the idea of application orchestration. With SOA, most applications were built around a service bus that provided message steering based on business rules, often authored in the Business Process Execution Language.

    Applications linked to microservices can use a variety of tools for orchestration, including the API broker, a storefront component or even a mobile app.

    The actual differences

    SOA and microservices often differ more on implementation than on principle. As a matter of practice rather than policy, most SOA applications are built around an enterprise service bus that not only provides work steering within an application, but also between related applications. SOA principles arguably subordinate componentization to within specific applications, but this is more a matter of practice, as noted.

    Another subtle implementation difference is that microservices are essentially infrastructure tools rather than application tools. SOA creates basic services, but with microservices, the components are as separated as websites are on the internet. There's often more reuse of microservices among applications, making it more important to manage the APIs and more difficult to rely on application-specific models of deployment, redeployment and scaling.

    If we reinvented SOA today from scratch, we'd almost surely invent microservices instead. That's not because microservices are totally different and new, but because they solve a long-standing problem rooted in software and networking concepts. SOA solved most of those problems in its time, and the basic principles it introduced are just as valid today.


    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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