The batch job then calculates the tax to be withheld, the bonus, and the net salary. Each line in the file contains an employee ID and the base salary (per month) for one employee. The SimplePayrollJob batch job involves reading input data for payroll processing from a comma-separated values (CSV) file. The application has been intentionally kept quite simple in order to focus on the key concepts of JSR 352.
This article demonstrates some of the key features of JSR 352 using a simple payroll processing application. A JobRepository could be implemented using, say, a database or a file system.ĭeveloping a Simple Payroll Processing Application JobOperator provides APIs to access this repository.
#Java batch script example free#
A batchlet is free to use anything to accomplish the step, such as sending an e-mail. JSR 352 also defines a roll-your-own kind of a step called a batchlet.Once the "chunk-size" number of items are read and processed, they are given to an ItemWriter, which writes the data (for example, to a database table or a flat file).
In this pattern, ItemReader reads one item at a time, ItemProcessor processes the item based upon the business logic (such as "calculate account balance"), and hands it to the batch runtime for aggregation. A chunk-style step contains exactly one ItemReader, one ItemProcessor, and one ItemWriter.There are two kinds of steps: chunk and batchlet. The batch specification deliberately leaves the definition of a step vague because the content of a step is purely application-specific and can be as complex or simple as the developer desires. A step contains all the necessary logic and data to perform the actual processing. A step is a domain object that encapsulates an independent, sequential phase of the job.In short, a job (with JSR 352) is basically a container for steps. In JSR 352, JSL is specified in an XML file called the job XML file. A job is put together using a Job Specification Language (JSL) that specifies the sequence in which the steps must be executed. A job encapsulates the entire batch process.This section and Figure 1 describe the basic components of the batch processing architecture. The article also describes how you can run batch applications using GlassFish Server Open Source Edition 4.0.
This article covers some of the key concepts including feature highlights, an overview of selected APIs, the structure of Job Specification Language, and a sample batch application.
#Java batch script example plus#
JSR 352 (Batch Processing for Java Platform), part of the recently introduced Java EE 7 platform, defines the programming model for batch applications plus a runtime to run and manage batch jobs. Also, since batch jobs are typically long-running jobs, check-pointing and restarting are common features found in batch jobs. Batch jobs can be run on schedule or initiated on demand. Typically, batch processing is bulk-oriented, non-interactive, and long running-and might be data- or computation-intensive. Examine the new batch processing capability provided by JSR 352 for Java EE 7.īatch processing is used in many industries for tasks ranging from payroll processing statement generation end-of-day jobs such as interest calculation and ETL (extract, load, and transform) in a data warehouse and many more.
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