@Override
	public void beforeStep(StepExecution stepExecution) {
		if (logger.isDebugEnabled()) {
			logger.debug("Executing beforeStep: " + stepExecution);
		}
		publish(stepExecution);
	}
@author Gunnar Hillert
@author Ilayaperumal Gopinathan
@since 1.0
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/plugins/job/support/listener/SimpleXdStepExecutionListener.java