laravel动态添加调度程序

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问题描述

我有一个系统，用户可以在其中通过UI创建后台任务.
任务间隔为每隔几个小时(用户界面中的用户选择).

I have a system where the user can create background tasks via the UI.
The task interval are every few hours (user choice in the UI).

当用户通过ui创建任务时，我想将其动态添加到调度程序中.

when the user creates a task via the ui i want to add it to the scheduler dynamically.

如示例所示，这是静态的而不是动态的.

As the example states, this is static and not dynamic.

protected function schedule(Schedule $schedule)
{
    $schedule->call(function () {
        DB::table('recent_users')->delete();
    })->daily();
}

有可能吗?如果没有的话，还有哪些选择呢?

Is it possible? if not, what are the alternatives?

谢谢

推荐答案

我不知道为什么不可能.每次运行php artisan schedule:run时，都会运行Kernel::schedule方法.如果您像文档一样进行设置，则应每分钟通过cron.

I don't see why it wouldn't be possible. The Kernel::schedule method will be run every time php artisan schedule:run is run. If you set it up like the documentation, should be every minute via a cron.

* * * * * php /path/to/artisan schedule:run >> /dev/null 2>&1

考虑到这一点，我不明白为什么你不能做这样的事情:

With that in mind, I don't see why you can't do something like this:

protected function schedule(Schedule $schedule)
{
    // Get all tasks from the database
    $tasks = Task::all();

    // Go through each task to dynamically set them up.
    foreach ($tasks as $task) {
        // Use the scheduler to add the task at its desired frequency
        $schedule->call(function() use($task) {
            // Run your task here
            $task->execute();
        })->cron($task->frequency);
    }
}

根据您存储的内容，您可以在这里使用任何您喜欢的东西来代替CRON方法.您可能在数据库中存储了一个字符串，该字符串表示Laravel的预定义频率之一，在这种情况下，您可以执行以下操作:

Depending on what you store, you can use whatever you like here instead of the CRON method. You might have a string stored in your database that represents one of Laravel's predefined frequencies and in which case you could do something like this:

$frequency = $task->frequency; // everyHour, everyMinute, twiceDaily etc.
$schedule->call(function() {
    $task->execute();
})->$frequency();

这里要注意的主要事情是，调度实际上并不是在数据库或其管理的cron中的任务中调度.调度程序每次运行时(每分钟)都会运行一次，并根据您为每个任务分配的频率来确定要运行的内容.

The main thing to note here, is that the schedule isn't actually scheduling in tasks in the database or in a cron that it manages. Every time the scheduler runs (Every minute) it runs and it determines what to run based on the frequencies you give each task.

示例:

您有一个使用->hourly()设置的任务，即每小时运行一次.
在00:00，计划运行，->hourly()过滤器通过，因为时间是小时，所以您的任务在运行.
在00:01，计划已运行，但是这次->hourly()筛选器失败，因此您的任务无法运行.

You have a task set up using ->hourly(), that is, to run on the hour, every hour.
At 00:00, the schedule runs, the ->hourly() filter passes, because the time is on the hour, so your task runs.
At 00:01, the schedule runs and but this time the ->hourly() filter fails, so your task does not run.

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