在作业完成之前返回Spring Batch作业ID

Question

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我试图在作业完成之前返回Spring Batch作业ID。

我当前的实现只在作业完成后返回信息。

我使用批处理程序控制器和批处理服务，发布在下面。谢谢，我是新来的Spring Batch，经过详尽的搜索，找不到太多与我的问题相关的。有一个帖子有人使用Apache骆驼，但我没有。

控制器

@RequestMapping(value = "/batch/{progName}", method = RequestMethod.GET)
    public ResponseEntity<JobResults> process(@PathVariable("progName") String progName,
                                              @RequestHeader("Accept") MediaType accept) throws Exception {
        HttpHeaders responseHeaders = MccControllerUtils.createCacheDisabledHeaders();
        responseHeaders.setContentType(MediaType.APPLICATION_XML);
        if(!accept.toString().equals("*/*")) {
            responseHeaders.setContentType(accept);
        }
        LOGGER.info("Running batch program " + progName);
        JobResults response = batchService.processProgName(progName);
        return new ResponseEntity<JobResults>(response, responseHeaders, HttpStatus.OK);
    }

服务

@Override
    public JobResults processProgName(String progName) throws Exception {

        String jobName = "call" + progName.toUpperCase() + "Job";
        JobExecution jobExecution = null;
        String result = "";
        Long jobId = null;
        JobResults results = new JobResults();
        BatchStatus jobStatus = null;
        try {
            // Launch the appropriate batch job.
            Map<String, Job> jobs = applicationContext.getBeansOfType(Job.class);
            LOGGER.info("BATCHSTART:Starting sync batch job:" + jobName);
            JobParametersBuilder builder = new JobParametersBuilder();
            // Pass in the runtime to ensure a fresh execution.
            builder.addDate("Runtime", new Date());
            jobExecution = jobLauncher.run(jobs.get(jobName), builder.toJobParameters());
            jobId = jobExecution.getId();
            jobStatus = jobExecution.getStatus();
            results.setName(jobName);
            results.setId(jobId);
            results.setMessage("The job has finished.");
            results.setStatus(jobStatus);
            LOGGER.info("The job ID is " + jobId);
            LOGGER.info("BATCHEND:Completed sync batch job:" + jobName);
            LOGGER.info("Completion status for batch job " + jobName + " is " + jobExecution.getStatus().name());
            List<Throwable> failures = jobExecution.getAllFailureExceptions();
            if (failures.isEmpty()) {
                result = jobExecution.getExecutionContext().getString(AbstractSetupTasklet.BATCH_PROGRAM_RESULT);
            } else {
                for (Throwable fail : failures) {
                    result += fail.getMessage() + "\n";
                }
            }
            LOGGER.info("The job results are: " + result);
        } catch (JobExecutionAlreadyRunningException | JobRestartException | JobInstanceAlreadyCompleteException
                | JobParametersInvalidException e) {
            throw new RuntimeException("An error occurred while attempting to execute a job. " + e.getMessage(), e);
        }
        return results;
    }

再次感谢。

编辑

我已将其添加到批处理配置中

@Bean(name = "AsyncJobLauncher")
    public JobLauncher simpleJobLauncher(JobRepository jobRepository){
        SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
        jobLauncher.setJobRepository(jobRepository);
        jobLauncher.setTaskExecutor(new SimpleAsyncTaskExecutor());
        return jobLauncher;
    }

编辑

在马哈茂德·本·哈辛的评论的帮助下，我解决了这个问题：）

我必须从服务中删除结果变量和信息，并添加上面看到的代码。当我到达我的endpoint时，我立即收到工作信息。

Answer 1

您可以做的是在您的批处理服务中注入一个JobLauncher实现，该实现由异步任务执行器（例如SimpleAsyncTaskExecutor或ThreadPoolTaskExecutor）支持。这将异步运行作业，并立即返回作业执行（您可以从中获取id），而无需等待作业完成。

因此，通过在BatchService中注入正确的JobLauncher实现，您将能够实现您的需求，而无需更改processProgName方法的代码。

您可以在这里找到有关如何同步或异步运行作业的更多详细信息：https://docs.spring.io/spring-batch/4.0.x/reference/html/job.html#configuringJobLauncher