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Test Code : 840-425
Test Name : Executing Cisco Advanced Business Value Analysis and Design Techniques
Vendor Name : Cisco
: 125 Real Questions

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Executing Cisco Advanced Business Value Analysis and Design Techniques book

Executing SOA: a technique for provider Modeling and Design | 840-425 Real Questions and VCE Practice Test

This chapter gives a detailed overview of a carrier-oriented design methodology and covers the SOA reference structure.

This chapter is from the booklet 

When the programming model shifted from the traditional procedural mannequin to that of object-orientation, an important paradigm shift came about on the earth of IT building. The center of attention turned into on encapsulating the state and habits of entities and calling that encapsulation a class. situations of a category have been known as objects, which occupied some space in the reminiscence. Object orientation (OO) introduced in ideas of inheritance, encapsulation, and polymorphism that could be applied to outline relationships between classes. With the incidence of using OO in the programming world, developers and architects begun noticing some patterns that may also be utilized to the usage of OO concepts to remedy an identical styles of issues. The patterns depicted the deconstruction of a problem into dissimilar classification entities, together with their interrelationships the usage of the fundamental concepts of OO, to supply an answer to the problem. The seminal work in this container changed into accomplished via the group of 4 authors in the ebook referred to as Design Patterns: features of Reusable Object-Oriented application. (See the "References" section.) Whereas in OO the primary-class constructs had been objects and classes, the subsequent-technology methodology for constructing application functions turned into known as element-based construction (CBD). In CBD, the primary-class constructs were components, the place a component turned into defined by way of its external specification, which can be used without any skills of its inner implementation. As such, the identical exterior specification may be implemented in distinctive programming language (for instance, Java, C#). The inner implementation of a component might also use assorted courses that jointly give the implementation of the exterior specification. The courses might use one or more design patterns, thereby leveraging the benefits of OO ideas.

In SOA, the leading emphasis is on the identification of the correct functions followed via their specification and realization. despite the fact some may argue that object-oriented analysis and design (OOAD) concepts may also be used as a pretty good beginning factor for capabilities, its main emphasis is on microlevel abstractions. functions, having said that, are company-aligned entities and hence are at a a whole lot better level of abstraction than are objects and components.

The main first-type constructs in an SOA are services, carrier add-ons, and procedure flows. For the sake of brevity, they seek advice from process flows as simply flows. These are at a degree of abstraction it's higher than that of objects, courses, and accessories. hence, there needs to be a more robust degree of modeling and design principles that contend with the first-type constructs of an SOA. service-oriented modeling and design is a discipline that offers prescriptive counsel about how to without difficulty design an SOA the usage of features, carrier add-ons, and flows. Rational utility, now a part of IBM, has provided an extension to Rational Unified system (RUP) called RUP-SOMA (see the "References" area), which is built on a carrier-oriented evaluation and design approach developed by IBM called carrier Oriented Modeling and structure (SOMA). The leisure of this chapter takes you through the SOMA method and explains how it helps in the identification, specification, and awareness of features, provider components, and flows.



When defining a carrier-oriented answer, it makes experience to hold a reference structure in context—an architecture that establishes the constructing blocks of SOA: capabilities, provider accessories, and flows that jointly aid commercial enterprise company tactics and the enterprise goals. The reference architecture gives traits and definitions for every layer and the relationships between them and assists within the placement of the architectural building blocks onto each layer. This layering helps the creation of architectural blueprints in SOA and helps in reusability of options and belongings inside an trade and probably throughout trade verticals. determine four-1 shows a sample logical SOA reference architecture.

Figure 4-1

figure four-1 Logical view of SOA Reference architecture

The figure shows a 9-layered structure with 5 horizontal layers and 4 vertical layers. The horizontal layers comply with the fundamental principle of a layered architecture mannequin through which structure constructing blocks (ABB) from layers above can entry ABBs from layers below, whereas layers under can also not entry ABBs from layers above. The vertical layers usually include ABBs which are cross-chopping in nature, which means that they could be relevant to and used by using ABBs in one or greater of the horizontal layers. this can also be called a partial layered architecture as a result of any layer above doesn't need to strictly engage with points from its instant decrease layer. as an example, a selected access channel can directly entry a carrier instead of wanting to move through a enterprise manner. The access constraints, despite the fact, are dictated with the aid of the architectural vogue, instructions, and concepts that follow to a given SOA solution. This view of the SOA reference structure is independent of any particular technology implementation, and hence is a logical view. circumstances of this logical architecture can also be developed for a specific platform and technology. Following are definitions of each and every of the layers:

  • Layer 1: Operational techniques—this layer includes the operational systems that exist in the present IT ambiance of the business, supporting enterprise activities. Operational systems consist of all custom functions, packaged purposes, legacy methods, transaction-processing systems, and the a lot of databases.
  • Layer 2: service component layer—components in this layer conform to the contracts defined with the aid of services in the capabilities layer. A provider element may know one or extra features. A service component gives an implementation façade that aggregates performance from dissimilar, feasible disparate, operational programs whereas hiding the combination and access complexities from the provider it truly is exposed to the consumer. The buyer consequently is oblivious of the carrier part, which encapsulates the implementation complexities. The potential of this façade part comes from the pliability of changing operational programs without affecting the carrier definition. The service component provides an enforcement point for service consciousness to make sure first-class of provider (QoS) and compliance to carrier level agreements.
  • Layer three: features layer—this residue include all the features defined in the business service portfolio. The definition of each and every service, which constitutes both its syntactic and semantic advice, is described in this layer. Whereas the syntactic counsel is very nearly around the operations on each and every service, the enter and output messages, and the definition of the provider faults, the semantic counsel is around the service guidelines, service administration selections, carrier entry requirements, etc. The services are defined in such a means that they are attainable to and invocable with the aid of channels and buyers impartial of implementation and the transport protocol. The essential step is the identification of the capabilities the use of the numerous recommendations that may also be employed for the same. The methodology that they center of attention on during this chapter addresses such identification thoughts.
  • Layer four: business system layer—company methods depict how the business runs. A enterprise system is an IT illustration of the quite a lot of actions coordinated and collaborated in an commercial enterprise to operate a specific high-stage business function. this deposit represents the approaches as an orchestration or a composition of loosely coupled functions—leveraging the features represented within the services layer. The layer is also answerable for the complete lifecycle administration of the procedures along with their orchestration, and choreography. The records and assistance circulation between steps within every method is also represented during this layer. strategies represented in this layer are the connection medium between enterprise requirements and their manifestation as it-level options using ABBs from different horizontal and vertical layers in the structure stack. users, channels, and B2B accomplice techniques in the customer layer makes use of the enterprise approaches in this layer as one of the ways to invoke application performance.
  • Layer 5: consumer layer—this layer depicts the various channels through which the IT services are delivered. The channels will also be within the sort of diverse person forms (as an example, exterior and inner consumers who access application performance through access mechanisms like B2B techniques, portals, rich purchasers, and other types). The purpose of this residue is to standardize on the access protocol and facts structure to enable the quick introduction of entrance ends to the enterprise procedures and features uncovered from the layers under. Some such requirements have emerged in the variety of portlets, service component structure (SCA) add-ons, and web features for far flung Portlets (WSRP). The adherence to common mechanisms for setting up the presentation layer components for the enterprise strategies and capabilities helps in featuring template solutions within the kind of commonplace architecture patterns, which helps the developer community to undertake normal front-end patterns for service consumption.
  • Layer 6: Integration layer—this accretion provides the ability for carrier consumers to locate service suppliers and provoke service invocations. through the three simple capabilities of mediation, routing, and statistics and protocol transformation, this deposit helps foster a service ecosystem wherein capabilities can talk with each other while being a part of a company process. the key nonfunctional requirements corresponding to security, latency, and first-rate of service between adjoining layers in the reference architecture are carried out by using the architecture constructing blocks during this layer. The capabilities of this layer are usually and more and more being jointly defined because the commercial enterprise carrier bus (ESB). An ESB is a set of structure patterns that uses open specifications and protocols to put into effect the three primary capabilities of this layer and supply a layer of indirection between the provider patrons and the provider provider via exposing the features handiest during the ESB. ESB products usually add some really expert features to provide differentiated capabilities in the marketplace.

    the combination capabilities are most ordinary with the aid of ABBs residing between Layer 2 via Layer 5. for instance, in Layer 5 there can be many buyers getting access to enterprise capabilities via distinct channel varieties. every channel category can use distinctive protocols—HTML, WML (for mobile clients), and Voice XML (for IVR users), to name just a few. each of these protocols and message formats may be passed through an Extensible Stylesheet Language Transformations (XSLT) engine earlier than the actual provider is invoked. This XSLT transform is always an ESB-offered characteristic. The fantastic thing about the ESB-based integration layer is that any function or feature that can also be uncovered in a manner that follows open requirements and protocols for access can also be plugged into the ESB so that it is enabled to take half in a carrier-based ecosystem. determine four-2 depicts a logical view of the ESB.

    Figure 4-2

    figure 4-2 Logical view of an ESB within the integration layer

    As figure four-2 suggests, the ESB provides capabilities for carrier patrons and providers to hook up with every different, for features to be found out using the registry, for functions to be managed and for secure invocations, and gives software programming interfaces (API) to facilitate the building of provider connectivity.

  • Layer 7: QoS layer—this accretion focuses on implementing and managing the nonfunctional necessities (NFR) that the capabilities deserve to enforce. youngsters SOA brings some true price proposition throughout the new architectural vogue, the programming model that supports the constructing of the first-category SOA constructs provides some inherent challenges that are nontrivial to tackle. The challenges come up while making an attempt to agree to the essential tenets of SOA: abstraction, open specifications and protocols, distributed computing, heterogeneous computing infrastructures, federated service ecosystem, and the like. Adherence to these compliance necessities commonly makes the implementation of the NFRs that a good deal more complex. this residue provides the infrastructure capabilities to realize the NFRs. It captures the information features that give the tips round noncompliance to NFRs at every of the horizontal layers. standard NFRs that it monitors for noncompliance is safety, availability, scalability, and reliability.
  • Layer eight: advice structure layer—this sediment ensures a proper representation of the facts and tips this is required in an SOA. The facts structure and the tips architecture representation (along with its key issues and instructions for its design and usage) at each specific horizontal layer are the responsibilities of this deposit.

    business fashions (for instance, ACORD, IAA, JXDD) and their utilization to outline the advice structure, together with enterprise protocols used to exchange enterprise statistics, are addressed during this layer. It also shops the metadata required for facts mining and enterprise intelligence. refer to the "References" part for the details of some business models.

  • Layer 9: Governance layer—this sediment ensures the suitable administration of the total lifecycle of the functions. it is accountable for prioritizing which excessive-cost services should still be applied, for each of the layers within the architecture, and for presenting a clarification in response to how the provider satisfies a enterprise or IT goal of the commercial enterprise. implementing both design-time and runtime guidelines that the capabilities should enforce and conform to is without doubt one of the key duties of this deposit. basically, this deposit gives a framework that correctly oversees the design and implementation of capabilities so that they comply with the a number of company and IT regulatory guidelines and requirements.

    Chapter three, "SOA Governance," discusses SOA governance and the tasks of a governance council in detail. those obligations all characteristic during this layer of the reference structure.

  • it's value noting that one of the primary causes for the SOA answer stack illustration is that it helps to talk, to the company and IT stakeholders, the evolution and awareness of the agencies SOA imaginative and prescient and roadmap through iterative implementation. communicating with the stakeholders is key to ensure that the enterprise dedication is pervasive across the various phases of an SOA initiative.

    The methodology that they discuss during this chapter will support in opting for, specifying, and realizing the first-type constructs of an SOA and their placement in the a lot of layers of the structure stack. This logical view of the SOA reference structure is also referred to as the SOA solution stack or just the solution stack. hence, the terms SOA reference structure, SOA solution stack, and solution stack all check with the identical concept and hence can also be used interchangeably.

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