Q. You want to expose an interface to clients of your service, without betraying the fact that your service is implemented in terms of messaging middleware.

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Q. Serving to abstract away the functionality of other components in an abbreviated interface to provide courser functionality.

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Q. The capability to hide messaging behind a POJO interface.

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Q. The most fundamental support for gateways comes from the Spring Integration class:-

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Q. The SimpleMessagingGateway needs a request and a response channel, and it coordinates the rest.

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Q. The first thing that the client configuration does is import a shared application context (to save typing if nothing else) that declares a JMS connection factor.

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Q. Messages sent on the requests channel are forwarded to the:-

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Q. The gateway element simply exists to identify the component and the interface.

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Q. There is no coupling between the client facing interface exposed via the gateway component and the interface of the service that ultimately handles the messages.

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Q. The service-activator is what handles actual processing and there’s no mention of a response channel, for either the service-activator, or for the inbound JMS gateway.

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Q. Spring Batch provides a lot of flexibility and guarantees to your application, but it cannot work in a vacuum. To do its work:-

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Q. There’s only one really useful implementation of the JobRepository interface, which stores information about the state of the batch processes in a database.

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Q. To load the contents of a properties file (batch.properties) whose values you use to configure the data source.

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Q. MapJobRegistry instance. This is critical—it is the central store for information regarding a given Job.

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Q. SimpleJobLauncher, whose sole purpose is to give you a mechanism to launch batch jobs, where a “job” in this case is our batch solution.

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Q. Spring Batch models solutions using XML schema.

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Q. However, it’s important to wear another hat, that of a DBA, when writing applications.

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Q. Indeed, a step could be considered the smallest unit of work for a job. Input (what’s read) is passed to the Step and potentially processed; then output (what’s written) is created from the step.

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Q. Attribute to configure how many items will be processed before the transaction is committed all the input is sent to the writer.

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Q. Class which delegates the task of delimiting fields and records within a file to a LineMapper, which in turn delegates the task of identifying the fields within that record, to LineTokenizer.

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