石英失败时重试

来源
：自动重试Quartz中失败的作业

如果您想要一项不断尝试直到成功的工作，您要做的就是抛出一个带有标志的JobExecutionException，以通知调度程序在失败时再次触发它。以下代码显示了如何：

class MyJob implements Job {    public MyJob() {    }    public void execute(JobExecutionContext context) throws JobExecutionException {        try{ //connect to other application etc        }        catch(Exception e){ Thread.sleep(600000); //sleep for 10 mins JobExecutionException e2 = new JobExecutionException(e); //fire it again e2.setRefireImmediately(true); throw e2;        }    }}

如果要重试一定次数，它将变得更加复杂。您必须使用StatefulJob并将retryCounter保留在其JobDataMap中，如果作业失败，则将其递增。如果计数器超过最大重试次数，则可以根据需要禁用该作业。

class MyJob implements StatefulJob {    public MyJob() {    }    public void execute(JobExecutionContext context) throws JobExecutionException {        JobDataMap dataMap = context.getJobDetail().getJobDataMap();        int count = dataMap.getIntValue("count");        // allow 5 retries        if(count >= 5){ JobExecutionException e = new JobExecutionException("Retries exceeded"); //make sure it doesn't run again e.setUnscheduleAllTriggers(true); throw e;        }        try{ //connect to other application etc //reset counter back to 0 dataMap.putAsString("count", 0);        }        catch(Exception e){ count++; dataMap.putAsString("count", count); JobExecutionException e2 = new JobExecutionException(e); Thread.sleep(600000); //sleep for 10 mins //fire it again e2.setRefireImmediately(true); throw e2;        }    }}