Spring Batch - Programmatic Flow Decision » grokonez

Spring Batch - Programmatic Flow Decision » grokonez

In the article, JavaSampleApproach will introduce about Programmatic Flow Decisions in Spring Batch. Related Post: Spring Batch ContentsA. Concept1. JobExecutionDecider2. “decision” tagB. PracticeI. TechnologiesII. Overview1. Project Structure2. Step to doIII. Practice1. Create Spring Boot project2. Add needed dependencies3. Create Batch Steps4. Create Flow Decision5. Create Launch Controller6. Config batch job7. Config Data Source for Batch … Continue reading "Spring Batch – Programmatic Flow Decision"

https://grokonez.com/spring-framework/spring-batch/spring-batch-programmatic-flow-decision

Spring Batch – Programmatic Flow Decision

In the article, JavaSampleApproach will introduce about Programmatic Flow Decisions in Spring Batch.

Related Post: Spring Batch

A. Concept

Spring Batch provides mechanics for controlling the flow steps of batch job: JobExecutionDecider interface & decision tag

1. JobExecutionDecider

The interface allowing for programmatic access to the decision on what the status of a flow should be. In here we need overwrite the function: FlowExecutionStatus decide(JobExecution jobExecution, StepExecution stepExecution): Strategy for branching an execution based on the state of an ongoing. The return value will be used as a status to determine the next step in the job.

package org.springframework.batch.core.job.flow;

import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.StepExecution;

/**
 * Interface allowing for programmatic access to the decision on what the status
 * of a flow should be.  For example, if some condition that's stored in the 
 * database indicates that the job should stop for a manual check, a decider
 * implementation could check that value to determine the status of the flow. 
 * 
 * @author Dave Syer
 * @since 2.0
 */
public interface JobExecutionDecider {

    /**
     * Strategy for branching an execution based on the state of an ongoing
     * {@link JobExecution}. The return value will be used as a status to
     * determine the next step in the job.
     * 
     * @param jobExecution a job execution
     * @param stepExecution the latest step execution (may be null)
     * @return the exit status code
     */
    FlowExecutionStatus decide(JobExecution jobExecution, StepExecution stepExecution);

}

2. "decision" tag

"decision" tag specify the decider to use as well as all of the transitions Example:

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https://grokonez.com/spring-framework/spring-batch/spring-batch-programmatic-flow-decision

Spring Batch – Programmatic Flow Decision

springbatch programmatic flow

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