/spring-3-batch

Primary LanguageJava

BATCH

  • root@c81f30ddbb71:/# psql -h spring-3-batch-postgres-1 -U myuser -d mydatabase
  • jobKey in batch_job_instance is the job parameter

data source

link: https://www.kaggle.com/datasets/gregorut/videogamesales?resource=download

Injecting Job Parameters

  • see tasklet in Boot class
  • steps
    • add @StepScope in order for the bean (Tasklet) to be recreated each time (test multiple time to validate)
      • then Inject using @Value
        • same way if the job parameters are the same for a period e.g same day job run,
        • by default this would be seen used before, @StepScope helps job

Reading and Writing

  • Item Reader
    • contract for reader :->> read in one line at a tme
  • Item Writer
    • contract for writer :->> you get a chunk

DefaultBatchConfiguration

  • this is called by default except you use @EnableBatchProcessing but you can't use together
  • check JobLauncher Bean (uses SimpleAsyncTaskExecutor) --->>> it takes you to this Default class
  • same for JobRepository
  • where