Hangfire:如何有条件地安排工作 [英] Hangfire: How to enqueue a job conditionally

问题描述

我正在使用Hangfire触发数据库检索操作作为后台作业.

I am using Hangfire to trigger a database retrieval operation as a background job.

该操作只能执行一次，并且可以通过多种方式触发. (例如，在UI中，每当用户拖放工具时，我都需要在后台启动该作业.但是，如果拖放其他工具，则我不想触发该后台作业，因为它已经从数据库).

This operation is only supposed to happen once, and can be triggered in multiple ways. (for example, in the UI whenever a user drags and drops a tool, I need to fire that job in the background. But if another tool is dragged and dropped, I don't want to fire the background job as it's already prefetched from the database).

这是我的代码现在的样子:

This is what my code looks like now:

var jobId = BackgroundJob.Enqueue<BackgroundModelHelper>( (x) => x.PreFetchBillingByTimePeriods(organizationId) );

我想要的是在执行上述语句之前进行的某种检查，以查找是否已经触发了后台作业；如果是，则不要开火，否则，将其入队.

What I want is some kind of check before I execute above statement, to find if a background job has already been fired; if yes, then do not fire another and if not, then enqueue this .

例如:

bool prefetchIsFired = false;

// find out if a background job has already been fired. If yes, set prefetchIsFired to true.

if (!prefetchIsFired)
     var jobId = BackgroundJob.Enqueue<BackgroundModelHelper>( (x) => x.PreFetchBillingByTimePeriods(organizationId, null) );

推荐答案

您可以在作业方法上使用过滤器(DisableMultipleQueuedItemsFilter)，如下所示:

You can use a filter (DisableMultipleQueuedItemsFilter) on your job method like here : https://discuss.hangfire.io/t/how-do-i-prevent-creation-of-duplicate-jobs/1222/4

这篇关于Hangfire:如何有条件地安排工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！