Question

我正在尝试用MDC记录工作信息。我有一个名为CommonBatchConfiguration的文件，用于处理线程和记录作业信息。我想记录jobName和executionId之类的内容，以记录可能运行的任何作业。

我有一个这样的启动器：

@Bean(name = "AsyncMccJobLauncher")
    public JobLauncher simpleJobLauncher(JobRepository jobRepository) {
        SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
        jobLauncher.setJobRepository(jobRepository);
        SimpleAsyncTaskExecutor taskExecutor = new SimpleAsyncTaskExecutor();
        taskExecutor.setTaskDecorator(new TaskDecorator() {

            @Override
            public Runnable decorate(Runnable runnable) {
//                MDC.put("execId", jobExecution.getJobId());
//                MDC.put("jobName", "test jobName");

                return new Runnable() {

                    @Override
                    public void run() {
                        // TODO Auto-generated method stub
                        // This adds batch logging info while the job is running
//                        MDC.put("execId", "here");
//                        MDC.put("jobName", "here");
                        runnable.run();
                    }
                };
            }
        });
        jobLauncher.setTaskExecutor(taskExecutor);
        return jobLauncher;
    }

如何在此处访问工作信息？当我尝试使用JobExecution时，它总是出现空值

Answer 1

在调用修饰的可运行对象时，应该已经创建了作业执行。问题是如何在这一点上访问它？我不确定这是否容易，除非您能够在包裹在匿名内部类实例（您的装饰器）中的匿名内部类实例（由Spring Batch创建的runnable）的方法中对final variable进行自省：-）

我想为任何可能运行的作业记录jobName和executionId之类的信息。

您可能不需要任务装饰器。您可以做的是子类SimpleJobLauncher并覆盖run，例如：

@Bean(name = "AsyncMccJobLauncher")
public JobLauncher simpleJobLauncher(JobRepository jobRepository) {
    SimpleJobLauncher jobLauncher = new SimpleJobLauncher() {
        @Override
        public JobExecution run(Job job, JobParameters jobParameters) throws JobExecutionAlreadyRunningException, JobRestartException, JobInstanceAlreadyCompleteException, JobParametersInvalidException {
            JobExecution jobExecution = super.run(job, jobParameters);
            // jobExecution is created and accessible here
            //MDC.put("execId", String.valueOf(jobExecution.getJobId()));
            //MDC.put("jobName", jobExecution.getJobInstance().getJobName());
            return jobExecution;
        }
    };
    jobLauncher.setJobRepository(jobRepository);
    SimpleAsyncTaskExecutor taskExecutor = new SimpleAsyncTaskExecutor();
    jobLauncher.setTaskExecutor(taskExecutor);
    return jobLauncher;
}

访问MDC的职位信息

1 个答案: