Q. To take an input file or a payload and reliably, and systematically, decompose it into events that an ESB can work with:-

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Q. Spring Integration does support reading files into the bus.

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Q. No processing system (such as an ESB) can deal with a million records at once efficiently.

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Q. Spring Batch reads the file, transforms the records into:-

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Q. The BPM engine would thread together the different actors and work lists,

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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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