Remember me. Our SOA Process Roadmap will tie everything together in what we hope will be a clear and understandable manner. With those sorts of numbers, it stands to reason that many readers will be interested in a roadmap and a cohesive example that brings some clarity to the problem. Hopefully this includes you. Service-Oriented Architecture SOA is an approach to building complex software systems from a set of reusable services that obey service-orientation principles. SOA enables construction of applications from fairly large chunks of reusable functionality that can built quickly, primarily from existing services.
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Remember me. Our SOA Process Roadmap will tie everything together in what we hope will be a clear and understandable manner. With those sorts of numbers, it stands to reason that many readers will be interested in a roadmap and a cohesive example that brings some clarity to the problem.
Hopefully this includes you. Service-Oriented Architecture SOA is an approach to building complex software systems from a set of reusable services that obey service-orientation principles. SOA enables construction of applications from fairly large chunks of reusable functionality that can built quickly, primarily from existing services.
A service that obeys the principles of service-orientation is an autonomous, loosely coupled, and stateless unit of functionality that is made available by a formally defined interface. The functionality provided by a service is discoverable by applications that use the service.
Services are not allowed to call other services, but may communicate with them via messages. That is, services are loosely coupled, and each service implements a single action, such as placing an online rental car reservation. Services are designed without knowing who will be using them.
In a service-oriented architecture, applications are built from services which communicate via messages using a process known as orchestration. A popular approach to implementing a service-oriented architecture is via web services, which make services accessible over the Internet independent of platforms and programming languages.
Building applications from services requires metadata that describes the characteristics of the services, and the data that is used. Figure 2 shows our top-level roadmap. Some of these top-level activities will expand out to a child diagram showing further detail.
As you can see, the domain model establishes the vocabulary we use to describe our system, and shows relationships between objects in the problem domain. In most cases these relationships include UML generalization and aggregation relationships not shown here. Business Rules are represented in Enterprise Architect as stereotyped Requirements. The top-level roadmap shown in Figure 2 reflects the philosophy that when you set out to implement a system using a service-oriented architecture, there will effectively be a mix of 3 different kinds of scenarios:.
Most systems will contain a mix of these different types of scenarios. In many cases but not all the " web-service scenarios " will cross Business To Business B2B boundaries. For example, a car rental reservation system talking to a credit card company to run a payment transaction is a B2B web-service scenario.
The " business rule scenarios " are more likely to be within the boundaries of one business, for example, the car rental system enforcing eligibility rules on driver age, credit score, etc. There is little or no user interface in these business rule scenarios, so they can be completely code generated from an activity diagram using the business rule composer.
For processes that are primarily focused on enforcing business rules, we take the right branch: Behavioral Code Generation from Activity Diagrams using the Business Rule Composer. Finally there is the user interface. These would be the screens of the car rental system that the reservations agent accesses, and which would trigger the business rule checks and B2B transactions. How would you do that? Web services support distributed, platform-independent development. Using web services, you can publish any application you choose to build over the web.
You can think of a web service as something like an Internet-enabled API. WSDL tells you only how you can interact with the web service; it says nothing about how the web service works internally. A Port associates a network address with a reusable binding, and a Message is an abstract description of the data that is being exchanged. This file structure is shown in Figure 5. Figure 7 shows the WSDL generation in progress.
You can use BPEL to build web services, to write programs that call web services, and to describe high-level business processes that make use of web services. BPEL business processes are often used to implement business-to-business B2B transactions where one business provides a web service and another business uses it. Our car rental example in this book is an example of this sort of B2B transaction.
BPEL is sometimes referred to as an orchestration language because it supports complex orchestrations sequences of messages being exchanged of multiple service applications.
Orchestration refers to the central control of the behavior of a distributed system as opposed to choreography, which refers to a distributed system that operates without centralized control.
There is intentionally no standard graphical notation for BPEL, and as a result, some vendors have invented their own notations. The process begins with a Start Event: a Request is received from the Customer. Even in a service-oriented system, not all business processes can be implemented by orchestrating web services. Some business processes will involve user interfaces, and some will be focused on enforcing business rules.
But those already strong capabilities have recently taken a quantum leap in power with the introduction of behavioral code generation from activity diagrams, state diagrams and sequence diagrams. The first thing we need to do is to create a RuleFlow diagram — in this case ProcessApplication Figure The RuleFlow diagram contains RuleTask actions.
Each RuleTask satisfies one or more business rules with some conditional logic. There are 2 sections on the Rule Composer screen. Code generation turns out to be very simple and yields astonishing results once all the preliminary work has been done. No programming required! Figure 16 — Enterprise Architect automatically generates complete behavioral logic for the entire rule flow.
Here are a few points worth noting:. Since well before UML even existed, one of the biggest issues with modeling software has been keeping the model and the source code synchronized. The typical experience used to be that UML models were most useful in getting the first release of software completed, but after the initial release, the code would evolve independently in a development environment, and the UML model would rapidly grow obsolete.
With the evolution of agile methodologies, this situation often led to projects abandoning UML modeling entirely, as agile methods specify many frequent releases of the software, and getting to the first release became a smaller and smaller percentage of solving the overall problem. Our SOA roadmap takes all these different types of scenarios into account.
Doug has spent the last few years doing "deep dive" consulting into cutting-edge technology including cross-platform mobile app development, REST APIs, and NoSQL databases, and gaining first-hand experience on some "hardcore agile" projects of varying sizes. Enterprise Architect version Forgot your username? Why Contribute?
Written by Nizam Mohamed. Written by sparxsystems. Social Media Channels. Rate this item 1 2 3 4 5 0 votes. Why a Service-Oriented Architecture Roadmap? Figure 3 — Domain Model also called Fact Model for the Car Rental System As you can see, the domain model establishes the vocabulary we use to describe our system, and shows relationships between objects in the problem domain. Figure 13 shows our roadmap for business-rule-centric scenarios.
Generate Behavioral Code from Activity Diagrams Code generation turns out to be very simple and yields astonishing results once all the preliminary work has been done. Read times. Published in White Papers. After running ICONIX for 35 years and writing 7 books on UML, use cases, and agile software development, Doug discovered a new way to improve productivity by leveragng parallel development, and founded Parallel Agile www.
Latest from doug rosenberg Parallel Agile book is available now! Anatomy of an Executable Architecture How does a code generator enable large-team parallel development? Login to post comments. All rights Reserved.
ICONIX process roadmaps
I am a pretty savvy EA user and there were definitely some eye openers in this book. Again, awesome job! Each step of the roadmap is brought to life using Enterprise Architect Business and Software Engineering edition to derive concrete deliverables from visual models. The author helps us to understand key SOA concepts and demystifies the "acronym soup" surrounding service-oriented development. Topics covered in this E-book include: domain modeling, business rules identification, process modeling and storyboarding, generating web service interfaces from visual models, BPEL engineering and behavioral code generation. Download the E-book in PDF format.
Iconix Process Roadmaps : Step-by-step Guidance for SOA, Embedded, and Algorithm-intensive Systems