xxl-job-admin调度中心启动过程（四） -JobCompleteHelper

JobCompleteHelper

JobCompleteHelper的作用：

1. 创建 callback线程池，该线程池负责处理任务执行回调。调度中心将调度某个执行器执行任务，执行器执行完任务后，要将结果回报给调度中心。
2. 任务结果丢失处理：调度记录停留在 “运行中” 状态超过10min，且对应执行器心跳注册失败不在线，则将本次调度主动标记失败；该处理每分钟执行一次；

创建线程池

// for callback
		callbackThreadPool = new ThreadPoolExecutor(
				2,
				20,
				30L,
				TimeUnit.SECONDS,
				new LinkedBlockingQueue<Runnable>(3000),
				new ThreadFactory() {
					@Override
					public Thread newThread(Runnable r) {
						return new Thread(r, "xxl-job, admin JobLosedMonitorHelper-callbackThreadPool-" + r.hashCode());
					}
				},
				new RejectedExecutionHandler() {
					@Override
					public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
						r.run();
						logger.warn(">>>>>>>>>>> xxl-job, callback too fast, match threadpool rejected handler(run now).");
					}
				});

处理执行时间超过10分钟的任务

处理流程：

1. 查询 xxl_job_log日志表中，调度成功、且正在执行中、且调度时间在10分钟前、且对应执行器实例为null的记录；
2. 将这些记录的执行状态设置为500，表示执行失败；

SELECT
	t.id
FROM
	xxl_job_log t 
LEFT JOIN xxl_job_registry t2 ON t.executor_address = t2.registry_value
WHERE
	t.trigger_code = 200
	AND t.handle_code = 0
	AND t.trigger_time <=  #{losedTime}
	AND t2.id IS NULL;

losedTime：当前时间-10分钟

// for monitor
		monitorThread = new Thread(new Runnable() {

			@Override
			public void run() {

				// wait for JobTriggerPoolHelper-init
				try {
					TimeUnit.MILLISECONDS.sleep(50);
				} catch (InterruptedException e) {
					if (!toStop) {
						logger.error(e.getMessage(), e);
					}
				}

				// monitor
				while (!toStop) {
					try {
						// 任务结果丢失处理：调度记录停留在 "运行中" 状态超过10min，且对应执行器心跳注册失败不在线，则将本地调度主动标记失败；
						Date losedTime = DateUtil.addMinutes(new Date(), -10);
						List<Long> losedJobIds  = XxlJobAdminConfig.getAdminConfig().getXxlJobLogDao().findLostJobIds(losedTime);

						if (losedJobIds!=null && losedJobIds.size()>0) {
							for (Long logId: losedJobIds) {

								XxlJobLog jobLog = new XxlJobLog();
								jobLog.setId(logId);

								jobLog.setHandleTime(new Date());
								jobLog.setHandleCode(ReturnT.FAIL_CODE);
								jobLog.setHandleMsg( I18nUtil.getString("joblog_lost_fail") );

								XxlJobCompleter.updateHandleInfoAndFinish(jobLog);
							}

						}
					} catch (Exception e) {
						if (!toStop) {
							logger.error(">>>>>>>>>>> xxl-job, job fail monitor thread error:{}", e);
						}
					}

                    try {
                        TimeUnit.SECONDS.sleep(60);
                    } catch (Exception e) {
                        if (!toStop) {
                            logger.error(e.getMessage(), e);
                        }
                    }

                }

				logger.info(">>>>>>>>>>> xxl-job, JobLosedMonitorHelper stop");

			}
		});
		monitorThread.setDaemon(true);
		monitorThread.setName("xxl-job, admin JobLosedMonitorHelper");
		monitorThread.start();