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Articles : Standardized Enterprise Intergration - Java Business Integration (JSR–208) :

Features

Decoupling

Service providers are separated from service consumers, thereby reducing the dependency between them. Any service provider or service consumer can be replaced without affecting the overall working of the system. Moreover since the dependence between the consumer and the provider is removed, they can be developed independently of each other.

Portability

JBI defines the Services in a language and platform independent fashion, which allows for services to be ported across multiple platforms.

Interoperability

Since the medium of exchange is XML, it allows numerous applications to talk to each other without any problem.

Service-oriented architecture

The JBI architecture is service-oriented architecture (SOA) based thereby increasing the decoupling between applications.

Reliability

Since JBI is architecture for an enterprise, high level of reliability is expected. 100% reliability may not be required but providing the level of service when needed might be enough.

Transactional

The JMI environment supports transactions. The NMS does not directly spawn transactions but it will readily pass information about a transaction along with the message. If a NMS message is controlled by a transaction, it will pass the transaction context as part of the message.

Persistence

The JMI environment proposes a persistence mechanism to allow storage of state of a message exchange. The saved message can be used for recovery when a restart is done or can be used to cache the message in the case of an expensive operation.

Note: The persistence mechanism is not yet part of the JBI specification.

Recoverability

JBI allows for recovery of an existing message which was lost as part of a restart. Recoverability is closely related to the persistence mechanism as persistence is used to recover the lost message.

Privacy

Privacy is required when the data is stored in some persistent storage and when business rules require that data be hidden from external sources. If JBI decides to have persistence then some kind of encryption should be used to secure the data. The JBI specification does not intend to address encryption, it is up to the implementers to decide on an encryption strategy.

Service Engine Framework

The Service Engine framework allows Service Engines to be included into the JBI environment. It also defines the API contracts between the engine and the environment. The process of installing and uninstalling Service engines are the responsibility of the framework.

SEs are the business entities of the JBI environment. SEs can be seen as stateless session beans, which can service requests from any Java client. In this case the SEs go a step further and can service any request they receive from any client. The client can be written in any program as long as it can interface in to the JBI environment using a Binding Component.

SEs can provide simple services like data transformation and complex services like EDI. SEs can provide services for message collation and de-collation, which are useful in routing services. SEs can also create new services by combining other services. This process of combining services is useful in WS- BPEL where services are constructed from processes.

The Service Engine must provide a life cycle class that implements the java.jbi.engine.EngineLifeCycle interface. The EngineLifeCycle interface will help to manage the life cycle methods of the SE.

When the SE is installed for the first time it exists in JBI environment in the ‘installed’ state. When the start method is invoked on the SE, the SE moves to the running state. If the initial state of the SE is ‘installed’ then a call to the init method is done to ensure all initialization actions are done prior to running the SE. The init method is called only once when the SE is called for the first time.

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