StepHandler (Spring Batch 4.1.4.RELEASE API)

所有已知实现类:
JsrStepHandler, SimpleStepHandler
```
public interface StepHandler
```
Strategy interface for handling a Step on behalf of a Job.
作者:
Dave Syer

- 方法概要
  所有方法实例方法抽象方法
  修饰符和类型方法说明
  StepExecution handleStep(Step step, JobExecution jobExecution)
  Handle a step and return the execution for it.

- 方法详细资料
  - handleStep
```
StepExecution handleStep(Step step,
                         JobExecution jobExecution)
                  throws JobInterruptedException,
                         JobRestartException,
                         StartLimitExceededException
```
    Handle a step and return the execution for it. Does not save the JobExecution, but should manage the persistence of the StepExecution if required (e.g. at least it needs to be added to a repository before the step can be executed).
    参数:
    step - a Step
    jobExecution - a JobExecution
    返回:
    an execution of the step
    抛出:
    JobInterruptedException - if there is an interruption
    JobRestartException - if there is a problem restarting a failed step
    StartLimitExceededException - if the step exceeds its start limit
    另请参阅:
    Job.execute(JobExecution), Step.execute(StepExecution)