What is JSR 352 API?

JSR 352 API, named Java Batch API, is a specification for Java batch processing applications.It provides a standard way to write, configure and perform batch tasks.The Batch task refers to a set of independent operations that can be performed in batches, such as large -scale data processing, report generation, and data conversion. JSR 352 API is based on the Java EE platform and uses EJB (Enterprise Java Beans) and JPA (Java Persistence API).Its main goal is to simplify the development process of batch processing applications, improve performance and scalability, and support deployment in various Java EE containers. The core concept of JSR 352 API includes: 1. Job (JOB): The highest level abstraction of batch processing tasks.A job contains a series of steps. 2. Step (STEP): an independent operation unit in the job.Each step can perform a single task, such as reading data, processing data, writing data, etc.The steps can be connected together in order to form the operation process. 3. Reader: A component of the step is used to read data from external data sources.For example, you can use the reader to read data from the database table. 4. Processor: A component of the step is used to process the read data.The processor can be transformed, calculated, verified, etc., and then transmits the processing data to the next step. 5. Write (Writer): A component of the step is used to write the processed data to the target data source.For example, you can write the data to the database table or generate report files with a written access. Below is a simple example of writing using the JSR 352 API: import javax.batch.api.AbstractBatchlet; import javax.batch.runtime.BatchStatus; import javax.inject.Named; @Named public class MyBatchlet extends AbstractBatchlet { @Override public String process() throws Exception { // The logic of executing batch processing tasks System.out.println ("In the execution of batch processing mission ..."); // Todo: Execute specific batch processing operations return BatchStatus.COMPLETED.toString(); } } This example shows a simple batch processing task, and a custom batch component is implemented by inheriting the ABSTRACTBATCHLET class.The process () method contains specific batch logic.In practical applications, more complicated batch tasks can be achieved by using different annotations and configurations. By using the JSR 352 API, developers can more conveniently build and manage large -scale batch processing applications.It provides a standardized way to define and perform operations, which can significantly improve development efficiency, and can be seamlessly operated in different Java EE containers.