Question

有一个@Aspect可确保不会重新启动Spring Boot中的作业。它在JobLauncherSynchronizer.java中实现并记录在here中。它在spring批处理管理工件中。

我的工作是通过@Bean创建的，如下所示：

@Bean
@Qualifier("synchronisationLauncher")
public JobLauncher synchronisationLauncher() throws Exception {
    SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
    jobLauncher.setJobRepository(jobRepository);
    jobLauncher.setTaskExecutor(new SimpleAsyncTaskExecutor());
    jobLauncher.afterPropertiesSet();
    return jobLauncher;
}

我的问题：
如何将@Aspect集成到JobLauncher中？

我天真地尝试更新它，并在上面的方法中设置了属性，不足为奇的是效果并不理想。我能够启动多个实例。

我的启动代码是：

// dependencies from constructor.
// the launcher is qualified to 'synchronisationLauncher'
private JobLauncher launcher;
private Job mergeJob;
private JobQueryHelper jobQueryHelper;

@PostMapping("uri")
public ResponseEntity<APIResponse> SynchroniseRetailers()
        throws JobParametersInvalidException,
               JobExecutionAlreadyRunningException,
               JobRestartException,
               JobInstanceAlreadyCompleteException {

    JobParametersBuilder builder = new JobParametersBuilder()
            .addLong("run.id", jobQueryHelper.findLastBatchExecutionIndex() + 1);
    launcher.run(mergeJob, builder.toJobParameters());
    return buildEmptyResponse();
}

Answer 1

您可以做的是重写SimpleJobLauncher#run方法并在运行作业之前添加仔细检查：

@Bean
public JobLauncher jobLauncher(JobRepository jobRepository, JobExplorer jobExplorer) {
    SimpleJobLauncher simpleJobLauncher = new SimpleJobLauncher() {
        @Override
        public JobExecution run(Job job, JobParameters jobParameters) throws JobExecutionAlreadyRunningException, JobRestartException, JobInstanceAlreadyCompleteException, JobParametersInvalidException {
            Set<JobExecution> running = jobExplorer.findRunningJobExecutions(job.getName());
            if (!running.isEmpty()) {
                throw new JobExecutionAlreadyRunningException("An instance of this job is already active: " + job.getName());
            }
            return super.run(job, jobParameters);
        }
    };
    simpleJobLauncher.setJobRepository(jobRepository);
    simpleJobLauncher.setTaskExecutor(new SimpleAsyncTaskExecutor());
    simpleJobLauncher.afterPropertiesSet();
    return simpleJobLauncher;
}

请注意，这类似于您共享方面的代码，但不需要任何种类的AOP。正如我在评论中提到的那样，此检查已在super.run(job, jobParameters)中完成，因此我们仅在此处添加了一个双重检查。

希望这会有所帮助。

我如何在Spring Admin中使用JobLauncherSynchronizer

1 个答案: