java为什么我的计划作业不能并行执行

Question

我试图弄明白为什么我的计划作业不能并行执行。也许我的交易管理有问题？方法JobScheduledExecutionService.execute()是@Scheduled和fixedRate=250的组合，所以无论前一个作业是否完成，都应该每250ms触发一次。由于日志，它无法按预期工作

日志：https://pastebin.com/M6FaXpeE

我的代码如下

@Service
@Slf4j
public class JobExecutionService {

    private final TransactionalJobExecutionService transactionalJobExecutionService;

    @Autowired
    public JobExecutionService(TransactionalJobExecutionService transactionalJobExecutionService) {
        this.transactionalJobExecutionService = transactionalJobExecutionService;
    }

    public void execute() {
        TestJob job = transactionalJobExecutionService.getJob();
        executeJob(job);
        transactionalJobExecutionService.finishJob(job);
    }

    private void executeJob(TestJob testJob) {
        log.debug("Execution-0: {}", testJob.toString());
        Random random = new Random();
        try {
            Thread.sleep(random.nextInt(3000) + 200);
        } catch (InterruptedException e) {
            log.error("Error", e);
        }
        log.debug("Execution-1: {}", testJob.toString());
    }

}

@Service
@Slf4j
public class JobScheduledExecutionService {

    private final JobExecutionService jobExecutionService;

    @Autowired
    public JobScheduledExecutionService(JobExecutionService jobExecutionService) {
        this.jobExecutionService = jobExecutionService;
    }

    @Scheduled(fixedRate = 250)
    public void execute() {
        log.trace("Job fired");
        jobExecutionService.execute();
    }

}

@Service
@Slf4j
@Transactional
public class TransactionalJobExecutionService {

    private final Environment environment;
    private final TestJobRepository testJobRepository;
    private final TestJobResultRepository testJobResultRepository;

    @Autowired
    public TransactionalJobExecutionService(Environment environment, TestJobRepository testJobRepository, TestJobResultRepository testJobResultRepository) {
        this.environment = environment;
        this.testJobRepository = testJobRepository;
        this.testJobResultRepository = testJobResultRepository;
    }

    public TestJob getJob() {
        TestJob testJob = testJobRepository.findFirstByStatusOrderByIdAsc(
                0
        );
        testJob.setStatus(1);
        testJobRepository.save(testJob);
        return testJob;
    }

    public void finishJob(TestJob testJob) {
        testJobResultRepository.save(
                new TestJobResult(
                        null,
                        testJob.getId(),
                        environment.getProperty("local.server.port")
                )
        );
    }

}

@Configuration
public class SchedulingConfigurerConfiguration implements SchedulingConfigurer {

    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
        taskScheduler.setPoolSize(32);
        taskScheduler.initialize();
        taskRegistrar.setTaskScheduler(taskScheduler);
    }

}

Answer 1

原因是调度器将只触发一个事件，该事件将由一个线程执行，然后我看不到您在逻辑中生成多个线程来并行执行。那个叫jobExecutionService的电话。执行（）；JobScheduledExecutionService的in execute（）位于该线程中。所以总的来说，它最终是顺序执行

似乎需要在JobExecutionService:execute（）中放入多线程的[Callable Future based]逻辑，以选择job[transactionalJobExecutionService.getJob（）]并在其中调用executeJob（）。希望这有帮助