为什么Spring Boot Batch作业仅运行一次? [英] Why Spring Boot Batch job is running just one time?

问题描述

我正在使用弹簧靴.我有一个使用这些类实现的批处理作业:

I'm using spring boot. I have a batch job which I've implemented with these classes :

我的主要课程是:

@SpringBootApplication
@ComponentScan("com.batch")
@PropertySource("classpath:application.properties")
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class);
    }

}

我的调度程序是:

@Component
@EnableScheduling
public class JobScheduler {

    @Scheduled(fixedRate = 10000)
    public void runJob() {
        SpringApplication.run(MyBatchConfig.class);
    }
}

我的批处理配置类是:

@Configuration
@EnableBatchProcessing
public class MyBatchConfig {

    @Value("${database.driver}")
    private String databaseDriver;
    @Value("${database.url}")
    private String databaseUrl;
    @Value("${database.username}")
    private String databaseUsername;
    @Value("${database.password}")
    private String databasePassword;

    @Bean
    public Job myJob(JobBuilderFactory jobs, Step s) {
        Job job = jobs.get("myJob")
                .incrementer(new RunIdIncrementer())
                .flow(s)
                .end()
                .build();
        return job;
    }

    @Bean
    public Step myStep(StepBuilderFactory stepBuilderFactory, ItemReader<Account> reader,
                      ItemWriter<Person> writer, ItemProcessor<Account, Person> processor) {
        TaskletStep step = stepBuilderFactory.get("myStep")
                .<Account, Person>chunk(1)
                .reader(reader)
                .processor(processor)
                .writer(writer)
                .build();
        step.setAllowStartIfComplete(true);
        return step;
    } ...

现在，我的问题是:

调度程序可以正常工作，并且每十秒钟重复一次， 但是作业仅在应用程序启动时执行(读取器，处理器和写入器在启动时仅执行一次)，看来

the scheduler works and it repeats every ten seconds, but the job executes only on application startup(reader, processor and writer just execute once in startup) and it seems that

SpringApplication.run(MyBatchConfig.class);

对重新运行作业没有影响.

has no effect on re-running the job.

我该怎么办?

预先感谢

推荐答案

这是我能想到的，

1.您将此属性放在application.properties中，因此您的批处理作业不会通过main方法中的SpringApplication.run(...)调用自动启动.

1.You put this property in application.properties so your batch job doesn't start automatically by call of SpringApplication.run(...) from mainmethod.

spring.batch.job.enabled=false

这只会简单地初始化您的Spring Batch配置，而不会真正开始工作.

This will simply initialize your Spring Batch configuration and not actually start job.

2.在Spring Boot Batch Job起始类上添加注释@EnableScheduling，即在代码中的Application类上.

2.Put annotation @EnableScheduling on your Spring Boot Batch Job starting class i.e. on Application class in your code.

3.从JobScheduler类中删除@EnableScheduling批注，然后从runJob()中调用jobLauncher.run(job, jobParameters)，而不是调用SpringApplication.run(MyBatchConfig.class).

3.Remove @EnableScheduling annotation from JobScheduler class and call , jobLauncher.run(job, jobParameters) from runJob() instead of calling SpringApplication.run(MyBatchConfig.class).

JobLauncher&由于上下文已初始化，因此Job bean可以自动连接到您的调度程序类.

JobLauncher & Job beans can be auto wired to your scheduler class since context is already initialized.

希望有帮助！

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