如何从Spring Batch中访问Bean集

Question

How can I retrieve a java object which is created from reader (Custom reader in my case) from writer?

I have to keep count of the records processed or skipped due to exception and all for mail notification after job execution. I don't want to put it in execution context as I don't need to persist it.

Can I just set a bean from reader and autowire it from writer and use it ?

Answer 1

You can simply use same class as reader , writer and then a instance variable can be shared. In fact you use same object for doing stuffs like sending mail by implementing StepExecutionListener in '@afterJob' method after completion of job.

This is good approach if you reader and writer are having simple code. Or you can delegate that code to other class by having separater reader and writer class having actual logic and you can pass your instance variable to those classes. You just need to define same class as reader , writer and listener in your configuration.

 public class CommitWriter implements ItemWriter<myObject>, ItemReader<myObject> , StepExecutionListener{

private myPojo sharedObject;

//Read method goes here
 public myObjectread() throws Exception{

 }
// Write method goes here
public void write(List<? extends myObject> arg0)
throws Exception {

}


 //After job
 @Override
public ExitStatus afterStep(StepExecution stepExecution) {

}

}