Application Integration: EAI, B2B, BPM and SOA in Java

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Application Integration: EAI, B2B, BPM and SOA
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Figure 4.17. Interface and implementation of a service
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4.5.1.2. Technological neutrality The separation of the interface from implementation makes technological neutrality possible: the technology used to implement the services is not significant, since the service is accessed through an interface made available on a standardized protocol. The promise of interoperability that follows from this is one of the principal factors in the popularity of the SOA approach. 4.5.1.3. Dynamic service discovery In a service-oriented architecture, service producers must publish their services, and service consumers must be able to search for published services (Figure 4.18). The operation is similar to a Yellow Pages type of registry. The data published provides the descriptions of the interfaces mentioned above. A repository of services that contains the set of service definitions (whatever the origins of the service) must be put in place in order to fulfill the function of services registry in an information system. Just like a person searching for a service supplier in a Yellow Pages registry, the service consumer in a service-oriented architecture discovers the reference for the searched service during execution.
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Figure 4.18. The dynamic discovery of services
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4.5.1.4. Reuse The reuse of existing components is a fundamental characteristic of services architectures. It is through reuse that agility and reactivity are conferred on the information system, by accelerated development of new applications that will use these components. To achieve this, callable components must be carefully selected and defined as services that can be used by a large number of clients. Technological neutrality and the exposition of services in a registry will facilitate this reuse, similar to loose coupling, discussed next. 4.5.1.5. Loose coupling One of the principal characteristics of the SOA approach lies in how a service is organized with its consumers. Specifically, services are designed without regard for any particular service consumer. Inside the service, no assumption is made concerning the objective or nature technical or functional of the service consumer. In this way, a service is totally decoupled from the service consumer. On the other hand, the consumer is dependent on the service, since it refers to the service interface. As a result, the SOA approach allows the implementation of an architecture with loose coupling. It is thus differentiated from a monolithic architecture, in which all the software components are designed to function in the initially projected context (known as strong coupling logic).
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Application Integration: EAI, B2B, BPM and SOA
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SOA is principally used in the development of applications that function in synchronous request/response mode a consumer calls the service offered by a producer and expects the most immediate possible response (it remains in place while awaiting the response). That said, the SOA can also be used in asynchronous mode a consumer calls the service offered by a producer, but does not remain in place while waiting for the response. In this case, the result of the demand will subsequently be supplied to the consumer if the service contract specifies it, or supplied to a third-party service that continues the work thus begun. An SOA therefore integrates asynchronous event-based management, which opens the way to one of the most promising aspects of the SOA approach: the orchestration of services for executing business processes. An important characteristic of the SOA approach is therefore the possibility of implementing business processes independently of the underlying technology of implementation. The services are chained to form the business processes (this chaining of services is sometimes referred to as choreography of services ). The choreography is subsequently executed for each instance of the process by the BPM engine, which plays the role of service orchestrator. A business process can itself be exposed as a service, and can be deployed and distributed at several separately accessible physical points (Figure 4.19). The orchestration of services is paramount to large-scale SOA deployment. However, other functions are necessary to, for example, play the role of intermediation between services and consumers of services by introducing the asynchronous communication mentioned above. These functions provide a level of abstraction such as determining the right service, a role of mediation between the consumer and the producer, possibilities for activating the transformation function on the information sent and received when the consumer and the producer have not previously agreed on the service contract (this is particularly the case for existing applications). In short, the implementation of SOA necessitates the deployment of a service infrastructure, often referred to as SOA Backbone.
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