This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Batch Documentation 5.1.2!spring-doc.cn

This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Batch Documentation 5.1.2!spring-doc.cn

As mentioned previously, a step reads in and writes out items, periodically committing by using the supplied PlatformTransactionManager. With a commit-interval of 1, it commits after writing each individual item. This is less than ideal in many situations, since beginning and committing a transaction is expensive. Ideally, it is preferable to process as many items as possible in each transaction, which is completely dependent upon the type of data being processed and the resources with which the step is interacting. For this reason, you can configure the number of items that are processed within a commit.spring-doc.cn

The following example shows a step whose tasklet has a commit-interval value of 10 as it would be defined in Java:spring-doc.cn

Java Configuration
@Bean
public Job sampleJob(JobRepository jobRepository, Step step1) {
    return new JobBuilder("sampleJob", jobRepository)
                     .start(step1)
                     .build();
}

@Bean
public Step step1(JobRepository jobRepository, PlatformTransactionManager transactionManager) {
	return new StepBuilder("step1", jobRepository)
				.<String, String>chunk(10, transactionManager)
				.reader(itemReader())
				.writer(itemWriter())
				.build();
}

The following example shows a step whose tasklet has a commit-interval value of 10 as it would be defined in XML:spring-doc.cn

XML Configuration
<job id="sampleJob">
    <step id="step1">
        <tasklet>
            <chunk reader="itemReader" writer="itemWriter" commit-interval="10"/>
        </tasklet>
    </step>
</job>

In the preceding example, 10 items are processed within each transaction. At the beginning of processing, a transaction is begun. Also, each time read is called on the ItemReader, a counter is incremented. When it reaches 10, the list of aggregated items is passed to the ItemWriter, and the transaction is committed.spring-doc.cn