1 CT30A8901 Chapter 10 SOA Delivery Strategies Prof. Jari Porras Communications Software Laboratory
2 Contents 10.1 SOA Delivery lifecycle phases 10.2 The top-down strategy 10.3 The bottom-up strategy 10.4 The agile strategy
3 SOA Delivery Lifecycle Phases The lifecycle of an SOA project is the total time it takes for each step to be completed for an SOA solution to be implemented This includes everything from: Proposal Hardware/Software development Implementation Operation
4 Basic phases of the SOA delivery lifecycle Development projects that are service-oriented are very similar to other custom development projects for distributed applications. Web services are designed, developed, and deployed along with standard components and the usual support of front- and back-end technologies
5 Figure 10.1: Common phases of an SOA delivery lifecycle. Copyright Pearson Education, Inc.
6 Common phases of SOA delivery lifecycle The first two phases are pre-fixed with service-oriented and not service because these phases require unique analysis and design processes that are distinctly serviceoriented Service phases are primarily concerned with the delivery of services that implement results of service-oriented analysis and design efforts.
7 Service-oriented Analysis Initial stage used to determine the potential scope of SOA Service layers are planned and individual services are modeled as service candidates that comprise an initial SOA
8 Service-oriented Design After a goal of the new SOA is designated Service layers are mapped out Service-oriented design is a heavily standardsdriven phase Incorporates industry conventions and serviceoriented principles into the service design process
9 Service Development Actual construction phase Platform-specific issues come into play, regardless of the service type Choice of programming language and development environment will determine the physical for services and organized business processes, according to design
10 Service Testing Given the generic nature and potential to be reused and composed in unforeseeable situations Services are required to undergo rigorous testing prior to deployment into a production environment
11 Sampling of key issues facing service testers What types of service requestors could potentially access a service? Can all service policy assertions be successfully met? How easily can services be composed? How easily can the service descriptions be discovered? What data typing-related issues might arise?
12 Service Deployment The implementation stage involves installing and configuring distributed components, service interfaces, and any associated middleware products on production servers.
13 Issues that arise during deployment phase How will services be distributed? What security settings and accounts are required? How should services used by multiple solutions be positioned and deployed? Is the infrastructure adequate to fulfill the processing requirements of all services?
14 Service Administration After services are deployed, application management issues come to the forefront. These are similar in nature to the administration concerns for distributed, component-based applications, They also might apply to services as a whole(as opposed to services belonging to a specific application environment)
15 SOA Delivery Strategies In order to function properly the different stages must be organized into a process that do the following: Accommodate preferences with regards to which types of service layers we want to deliver Coordinate the delivery of application, business and process services Support a transition toward a standardized SOA while helping fulfill immediate, project-specific requirements
16 SOA Delivery Strategies Success of SOA within an enterprise is generally dependent on the extent to which it is standardized when it is phased into business and application domains The success of a project delivering a service-oriented solution generally is a measured by the extent to which the solution fulfills expected requirements within a given budget and timeline
17 SOA Delivery Strategies To address this issue a strategy must be devised. The strategy must be based on an organization s priorities to establish the correct balance between the delivery of long-term migration goals with the fulfillment of short-term requirements
18 SOA Delivery Strategies Three common strategies have emerged, each addressing this problem in a different manner Top-down Bottom-up Agile (or meet-in-the-middle) These paths differ in priorities and practical considerations.
19 The Top-Down Strategy This strategy is very much an analysis first approach that requires not only business process to become service-oriented, but also promotes the creation (or realignment) of an organization s overall business model This process is therefore closely tied to or derived from an organization s existing business logic. Top-down strategy supports the creation of all three of the service layers It is common for this approach to result in the creation of numerous reusable business application services
20 Common top-down strategy process steps
21 Step 1: Define enterprise business models The format of enterprise business models tends to vary across different organizations, each of which will have models that are unique to its business domains Common types of enterprise business model documents include a formal ontology, an enterprise entity model, an enterprise-wide logical data model, a standardized data representation architecture, and other forms of models generally associated with enterprise information architecture
22 Step 1: Define enterprise business models Some of these models provide business-centric perspectives of an organization that prove extremely valuable sources for deriving business services. Business entity models especially tie directly into the subsequent definition of entity-centric business services
23 Step 1: Define enterprise business models Although listed as a single step in a highlevel process, the requirements to properly define enterprise business models can easily result in the need for one or more separate processes, each of which may require its own project and working group. On the other hand, if the required enterprise business models already exist, then this step may simply consist of their identification
24 Step 2: Compose SOA When a top-down strategy is employed, this step is often considered part of the up-front analysis effort required prior to the deliver of services, and is therefore not associated with the service-oriented design phase
25 Step 3: Define Enterprise Service Model This step represents the creation of a specific type of enterprise business model known as the enterprise service model This specification provides a formal documentation of a planned service inventory where numerous (sometimes all) service candidates are defined ahead of time, prior to entering deliver stages
26 Step 3: Define Enterprise Service Model The enterprise service model implements the service layers chosen in Step 3 and thereby establishes a standardized, layered view of an enterprise-wide service portfolio. Notice in the top-down strategy diagram, there is an optional iterative relationship between this step and the service-oriented analysis process. A recommended strategy for creating an enterprise service model is to cycle through the serviceoriented analysis process once for every known business process, thereby defining and constantly refining service candidates (especially agnostic candidates) prior to actual design and development
27 Step 4: Perform Service-Oriented Analysis A service-oriented analysis phase is completed** **Service-oriented analysis will be fully discussed in Chapters 11 & 12
28 Step 5: Perform service-oriented design The service layers are formally defined as part of a service-oriented design process** **Service-oriented design will be fully discussed in Chapters 13 & 16
29 Step 6: Develop the Required Services Services are developed according to their respective design specifications and the service descriptions created is Step 4
30 Step 7: Test the Services and All Service Operations The testing stage requires that all service operations undergo necessary quality assurance checks. This typically exceeds the amount of testing required for the automation logic being implemented because reusable services will likely need to be subjected to testing beyond the immediate scope of the solution
31 Step 8: Deploy the Services The solution is finally deployed into production An implementation consideration beyond those we originally identified as part of this step is the future reuse potential of the service. To facilitate multiple service requestors, highly reusable services may require extra processing power and may have special security and accessibility requirements that will need to be accommodated.
32 Top-Down Pros and Cons: Pros Top-down approach to building SOA generally results in a high quality service architecture. The design and parameters around each service are thoroughly analyzed, maximizing reusability potential and opportunities for streamlined compositions. All of this lays the groundwork for a standardized and federated enterprise where services maintain a state of adaptability, while continuing to unify existing heterogeneity.
33 Top-Down Pros and Cons: Cons The obstacles to following a top-down approach usually are associated with time and money. Organizations are required to invest significantly in up-front analysis projects that can take a great deal of time (proportional to the size of the organization and the immediate solution), without showing any immediate results.
34 Figure 10.3: Common bottom-up strategy process steps. Copyright Pearson Education, Inc.
35 Bottom-Up Strategy Process A typical bottom-up approach follows a process similar to the one explained in the previous diagram This process assumes that the business requirements have already been collected and defined.
36 Step 1: Model Application Services This step results in the definition of application requirements that can be fulfilled through the use of Web services. Typical requirements include the need to establish point-to-point integration channels between legacy systems or B2B solutions. Other common requirements emerge out of the desire to replace traditional remote communication technology with the SOAP messaging communications framework.
37 Step 1: Model Application Services For solutions that employ the bottom-up strategy to deliver highly service-centric solutions, applications services also will be modeled to include specific business logic and rules In this case, it is likely that two application service layers will emerge, consisting of hybrid and utility services. Those services classified as reusable may act as generic application endpoints for integration purposes, or they may be composed by parent hybrid services
38 Step 2: Design the Required Application Services Some of the application services modeled in Step 1 may be delivered by purchasing or leasing thirdparty wrapper services or perhaps through the creation of auto-generated proxy services These services may provide little opportunity for additional design. Custom application services, though, will need to undergo a design process wherein existing design standards are applied to ensure a level of consistency
39 Step 3: Develop the Required Application Services Application services are developed according to their respective service descriptions and applicable design specifications
40 Step 4: Test the Services Services, their associated solution environment, and underlying legacy logic are tested to ensure that processing requirements can be met Performances and stress testing measures often are used to set the processing parameters of legacy systems exposed via wrapper services Security testing is also an important part of this stage
41 Step 5: Deploy the Services The solution and its application services are deployed into production Implementation considerations for applications services frequently include performance and security requirements
42 Bottom-Up Pros and Cons: Pros The majority of organizations that currently are building Web services apply the bottomup approach The primary reason behind this is that organizations simply add Web services to their existing application environments to leverage the Web services technology set The architecture within which Web services are added remains unchanged, and serviceorientation principles are therefore rarely considered
43 Bottom-Up Pros and Cons: Cons As a result, the term that is used to refer to this approach the bottom-up strategy is somewhat of a misnomer The bottom-up strategy is really not a strategy at all Nor is it a valid approach to achieving contemporary SOA This is a realization that will hit many organizations as they begin to take serviceorientation, as an architectural model, more seriously
44 Bottom-Up Pros and Cons: Cons Although the bottom-up design allows for the efficient creation of Web services as required by applications, implementing a proper SOA at a later point can result in a great deal of retro-fitting or even the introduction of new standardized service layers positioned over the top of the non-standardized services produced by this approach
45 Copyright Pearson Education, Inc.
46 The Agile Strategy Process The process steps shown in the previous figure, demonstrate an example of how an agile strategy can be used to reach the respective goals of the top-down and bottom-up approaches The challenge remains to find an acceptable balance between incorporating service oriented design principles into business analysis environments without having to wait before integrating Web services technologies into technical environment For many organizations this is therefore useful to view these two approaches as extremes and to find a suitable middle ground
47 The Agile Strategy This is possible by defining a new process that allows for the business-level analysis to occur concurrently with service design and development Also known as the meet-in-the-middle approach, the agile strategy is more complex than the previous two simply because it needs to fulfill two opposing sets of requirements
48 Step 1: Perform a Top-Down analysis This step essentially encompasses Steps 1,2, and 3 from the top-down strategy described earlier, except that areas of the enterprise for which service delivery is a priority are given immediate attention After Step 2 has started, Step 1 continues as an on-going effort to further achieve the enterprise-wide analysis goals generally associated with the top-down approach
49 Step 2: When the top-down analysis has sufficiently progressed, perform service-oriented analysis While Step 1 is still in progress, this step initiates a service-oriented analysis phase Depending on the magnitude of analysis required to complete Step 1, it is advisable to give that step a head start. The further along it progresses, the more service designs will benefit
50 Step 2: When the top-down analysis has sufficiently progressed, perform service-oriented analysis After the top-down analysis has sufficiently progressed, model business services to best represent the business model with whatever analysis results are available. This is a key decision point in this process It may require an educated judgment call to determine whether the on-going top-down analysis is sufficiently mature to proceed with the creation of business service models This consideration must then be weighed against the importance and urgency of pending project requirements
51 Step 3: Perform service-oriented design The chosen service layers are defined and individual services are designed as part of a serviceoriented design process The extent to which the Compose SOA part of this process is required depends on the extent to which it was already addressed in Step 1
52 Step 4,5, and 6: Develop,Test, and Deploy The Services Develop the services and submit them to the standard testing and deployment procedures
53 Step 7: As the Top-Down analysis continues to progress, revisit business services Perform periodic reviews of all business services to compare their design against the current state of the business models Make a note of discrepancies and schedule a redesign for those services most out of alignment This Typically will require an extension to an existing service for it to better provide the full range of required capabilities When redesigned, a service will need to again undergo standard development, testing, and deployment steps
54 Step 7: As the Top-Down analysis continues to progress, revisit business services To preserve the integrity of services produced by this approach, the concept of immutable service contracts needs to strictly enforced After a contract is published, it cannot be altered. Unless revisions to services result in extensions that impose no restrictions on an existing contact(i.e.the addition of new operations to a WSDL definition), Step 7 of this process likely will result in the need to publish new contract versions and the requirement for a version management system
55 The Agile Strategy Pros and Cons: Pros This strategy takes the best of both worlds and combines it into an approach for realizing SOA that meets immediate requirements without jeopardizing the integrity of an organization s business model and the service-oriented qualities of architecture.
56 The Agile Strategy Pros and Cons: Cons While it fulfills both short and long-term needs, the net result of employing this strategy is increased effort associated with the delivery of every service The fact that services may need to be revisited, redesigned, redeveloped, and redeployed will add up proportionally to the amount of services subjected to this retasking step
57 The Agile Strategy Pros and Cons: Side note This approach imposes maintenance tasks that are required to ensure that existing services are actually kept in alignment with revised business models Even with a maintenance process in place, services still run the risk of misalignment with a constantly changing business model.
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