java - Spring批量返回自定义进程退出码

Question

我有一个包含多个作业的 jar，我只想每次执行一个作业并检索自定义退出代码。

例如，我有一个基本的作业 (retrieveErrorsJob) 配置，其中一个步骤将读取一个输入 XML 文件并将数据写入特定的数据库表中。

应用类

@SpringBootApplication
@EnableBatchProcessing
@Import(CoreCommonsAppComponent.class)
public class Application {

    private static final Logger logger = LoggerFactory.getLogger(Application.class);
    private ConfigurationConstants constants;

    @Autowired
    public Application(ConfigurationConstants constants) {
        this.constants = constants;
    }

    @EventListener(ApplicationStartedEvent.class)
    public void idApplication()
    {
        logger.info("================================================");
        logger.info(constants.APPLICATION_NAME() + "-v." + constants.APPLICATION_VERSION() + " started on " + constants.REMOTE_HOST());
        logger.info("------------------------------------------------");
    }

    public static void main(String... args) throws Exception{
        ApplicationContext context = SpringApplication.run(Application.class, args);
        logger.info("================================================");
        SpringApplication.exit(context);
    }
}

我可以从命令行中选择一项工作:

java -jar my-jar.jar --spring.batch.job.names=retrieveErrorsJob --input.xml.file=myfile.xml

Spring Batch 开始正确的作业。

问题是我需要 jar 返回自定义进程退出整数，如 ExitCode.FAILED == 4 等。但我总是有一个零(如果 ExitCode = SUCCESS 或 FAILED)。

根据文档，我需要实现 ExitCodeMapper 接口(interface)。

代码(未完成)

public class CustomExitCodeMapper implements ExitCodeMapper {

private static final int NORMAL_END_EXECUTION = 1;
private static final int NORMAL_END_WARNING = 2;
private static final int ABNORMAL_END_WARNING = 3;
private static final int ABNORMAL_END_ERROR = 4;

@Override
public int intValue(String exitCode) {

    System.out.println("EXIT CODE = " + exitCode);

    switch (exitCode)
    {
        case "FAILED":
            return ABNORMAL_END_WARNING;
        default:
            return NORMAL_END_EXECUTION;
    }
}

我找不到使用此自定义实现的方法。我可以将自定义实现设置为 CommandLineJobRunner 但如何使用此类？

Answer 1

感谢@Mahendra，我有了一个主意:)

我按照@Mahendra 的建议创建了一个JobCompletionNotificationListener 类:

@Component
public class JobCompletionNotificationListener extends JobExecutionListenerSupport {

    private static final Logger logger = LoggerFactory.getLogger(JobCompletionNotificationListener.class);

    @Override
    public void afterJob(JobExecution jobExecution) {

        SingletonExitCode exitCode = SingletonExitCode.getInstance();

       if(jobExecution.getStatus() == BatchStatus.COMPLETED)
       {
           logger.info("Exit with code " + ExitCode.NORMAL_END_OF_EXECUTION);
           exitCode.setExitCode(ExitCode.NORMAL_END_OF_EXECUTION);
       }
       else {
           logger.info("Exit with code " + ExitCode.ABNORMAL_END_OF_EXECUTION_WARNING);
           exitCode.setExitCode(ExitCode.ABNORMAL_END_OF_EXECUTION_WARNING);
       }
    }
}

但我不会强制应用程序使用此类中的 System.exit() 退出。我已经实现了一个像这样的简单单例:

public class SingletonExitCode {

    public ExitCode exitCode = ExitCode.ABNORMAL_END_OF_EXECUTION_WARNING; // Default code 3
    private static SingletonExitCode instance = new SingletonExitCode();

    private SingletonExitCode() {}

    public static SingletonExitCode getInstance() {
        return instance;
    }

    public void setExitCode(ExitCode exitCode) {
        this.exitCode = exitCode;
    }
}

在关闭 Spring 上下文后，我从我的单例中询问 ExitCode:

@SpringBootApplication
@EnableBatchProcessing
@Import(CoreCommonsAppComponent.class)
public class Application {
    // a lot of nice things

    public static void main(String... args) throws Exception{
        ApplicationContext context = SpringApplication.run(Application.class, args);
        logger.info("================================================");
        SpringApplication.exit(context);
        System.exit(SingletonExitCode.getInstance().exitCode.getCode());
    }
}

我这样做是因为如果我们直接退出 JobCompletionNotificationListener 类，我们会错过日志中的重要一行:

Job: [FlowJob: [name=writeErrorFromFile]] completed with the following parameters: [{-input.xml.file=c:/temp/unit-test-error.xml, -spring.batch.job.names=writeErrorFromFile, run.id=15, input.xml.file=c:/temp/unit-test-error.xml}] and the following status: [FAILED]

并且似乎 Spring 上下文没有正确关闭。