Task Scheduler Like Cron job

[lablnet]

There should be package that allow to handle task scheduler / cron job cross platform

[peter279k]

The Cron job has the two key components.

• Cron expression parser. It includes specific time.
• Cron job task manager/scheduler.

Should we implement these all components?

[peter279k]

You also mention about the cross platform.

I am not familiar with the cron job task on Windows.

I also am familiar with cron job on Linux.

[lablnet]

Yes should implemented all components.

in windows there is Task Scheduler

when you send your proposal as a pull request i will add Win task scheduler support

write in such a way it has option to add support for windows

[peter279k]

@lablnet, when I think this deeply, I found the following way to do Cron job package to support cross platform.

• Using the scheduler.php to let this program run on every minute.
• On every minute, we check the specific job should be executed.
• We can use the log file or DB to store every task current execution time.

[lablnet]

@peter279k Yes but this approach has few drawbacks

Using the scheduler.php to let this program run on every minute

First if any developer want to set schedule to set for 30 seconds then what result expected?

Also i think this make framework slightly slower

How can we execute scheduler.php on every mints, without task scheduler or cron?

The approach i think there should be four files

• AbstractScheduler.php => expression parser
• Cron.php => Crons commands {extend AbstractScheduler}
• Schedule.php => Task Scheduler {extend AbstractScheduler}
• Scheduler.php => Scheduler which use {Cron or Schedule} Both class Cron and Schedule should have same methods we can do following in Scheduler,php

namespace Zest\Scheduler;

class Scheduler
{
      public function __construct()
     {
           $this->scheduler = php_os() === 'win' ? new Schedule() : new Cron();
     }
}

What do you think?

[peter279k]

It looks good, but we don't want to let developer set less than one minute on cron job.

I think it is fine to use the following code you mention.

Muhammad Umer Farooq [email protected] 於 2019年3月24日 週日 下午5:43 寫道：

@peter279k https://github.com/peter279k Yes but this approach has few drawbacks

Using the scheduler.php to let this program run on every minute

First if any developer want to set schedule to set for 30 seconds then what result expected?

Also i think this make framework slightly slower

How can we execute scheduler.php on every mints, without task scheduler or cron?

The approach i think there should be four files

• AbstractScheduler.php => expression parser
• Cron.php => Crons commands {extend AbstractScheduler}
• Schedule.php => Task Scheduler {extend AbstractScheduler}
• Scheduler.php => Scheduler which use {Cron or Schedule}

we can do following in Scheduler,php

namespace Zest\Scheduler;class Scheduler{ public function __construct() { $this->scheduler = php_os() === 'win' ? new Schedule() : new Cron(); }}

What do you think?

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[lablnet]

Sure, so we can start before started actual development it good to write Contracts First it let me to starts write schedule.php part so you can write Contracts/Interfaces and pull here => https://github.com/zestframework/Zest_Framework/tree/master/src/Contracts with sub folder

the interface name should same as class we can use somthing like `use \Zest\Contracts\Sitemap\SItemapIndex as SitemapIndexContract``

[peter279k]

@Lablnet, consider following code:

$jobs = [
    [new CronExpression('cron job time'), new TaskName()],
    [new CronExpression('cron job time'), new TaskName()],
];

$scheduler = new Schedule($jobs);
$scheduler->run();

And let the task be interface so that we can let developers follow Task interface to customize the Task class.

What do you think about that?

[lablnet]

Yes you are right

but instead of saying CronExpression it better say TaskExpression or SchedulerExpression