Spring batch note

1. The overall architecture 


2. Java Config Annotation

The @EnableBatchProcessing works similarly to the other @Enable* annotations in the Spring family. In this case, @EnableBatchProcessing provides a base configuration for building batch jobs. Within this base configuration, an instance of StepScope is created in addition to a number of beans made available to be autowired:

• JobRepository - bean name "jobRepository"
• JobLauncher - bean name "jobLauncher"
• JobRegistry - bean name "jobRegistry"
• PlatformTransactionManager - bean name "transactionManager"
• JobBuilderFactory - bean name "jobBuilders"
• StepBuilderFactory - bean name "stepBuilders"

The core interface for this configuration is the BatchConfigurer. The default implementation provides the beans mentioned above and requires a DataSource as a bean within the context to be provided. This data source will be used by the JobRepository. You can customize any of these beans by creating a custom implementation of the BatchConfigurer interface. Typically, extending the DefaultBatchConfigurer (which is provided if a BatchConfigurer is not found) and overriding the required getter is sufficient.