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A somewhat cheaper alternative. Run the CRON: every monday, tuesday, wednesday, thrursday, friday at 07:00 This weekday CRON starts a task (deferred or push), which will schedule a next task in 10 minutes until 15:00.

So I am still new to cron jobs and I don't really know what you mean with the deferred or push . Are you saying have a cron job run another cron job and if so how would you do that cause there is no example on google site, and I can't seem to find an example throw a internet search any resource would be great. Thanks.

The weekday CRON job adds one task by queueing a task request to a push queue or the deferred queue. Deferred is very easy to use. At the end of such a task, the task will queue the next task, etc. See: developers.google.com/appengine/docs/python/taskqueue/ Clear?

python - Seting up a cron job in google app engine - Stack Overflow

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"0 0/14 * * * ?" means the next fire time from the beginning of the clock for every 14 minutes interval, like what you said.

The 1st '0' means SECOND at 0 (or 12) at the clock; and same for the 2nd '0' which means the MINUTE at 0 (or 12) at the clock; '/14' means 14 minutes as the interval.

So get the SECOND and MINUTE from current time and concatenate them with the interval into a cron expression then fire it. Below is the example for Java:

public static String getCronExpressionFromNowWithSchedule(int minuteInterval) throws Exception {
    String cronExpression = "";
    Calendar now = Calendar.getInstance();
    int year = now.get(Calendar.YEAR);
    int month = now.get(Calendar.MONTH); // Note: zero based!
    int day = now.get(Calendar.DAY_OF_MONTH);
    int hour = now.get(Calendar.HOUR_OF_DAY);
    int minute = now.get(Calendar.MINUTE);
    int second = now.get(Calendar.SECOND);
    int millis = now.get(Calendar.MILLISECOND);

    if (minuteInterval<=0) cronExpression = (second+1)+" * * * * ?";
    else cronExpression = (second+1)+" "+minute+"/"+minuteInterval+" * * * ?";

    System.out.println(cronExpression);
    return cronExpression;
}

The next fire time is at next second from current time for the Minute interval you passed into this method.

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I would use cron every minute to look for MeasurementSettings that should run NOW. If yes, create a Sidekiq job to run immediately which populates the Measurement.

I guess that whenever would come in handy here. But how would I time it, like when I have cron run at, say, 12:00 PM, then check if the setting is .occurring_at(Time.now), I'd see that it should run, and start the measurement. But at 12:01 PM, the same measurement would still be running. Is there a way to catch this before using some interaction between ice_cube and Sidekiq or should I check if there is a measurement with this exact setting already running myself?

Preventing Measurements from stacking up is a common problem with scheduled jobs. There is no easy solution.

ruby on rails - How to schedule Sidekiq jobs according to a recurring ...

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You should save the time (now+10 minutes) in a database and then run a cronjob every minute (or whatever you prefer). This should then evaluate all fights that should be fought at that time. For best practices on this behaviour see A cron job for rails: best practices?

You could also add a check if a fight can be fought on every request you get. This way you'll get a little bit more randomness when the fight will start exactly and depending on the traffic of your site, this could be like every second. Remember to start a thread to evaluate the fight, depending on the amount of your calculations. Otherwise some users can experience massive lags.

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Approach #3 is the standard solution. For instance you can have the cron job touch a file every time it runs. Then on startup you can check whether that file has been touched recently, and if it has then exit immediately. Else start running. (Other approaches include using file locking, or else writing the pid to a file and on startup check whether that pid exists and is the expected program.)

As for the one second timeout, I would suggest calling usleep at the end of your query, supplying the number of milliseconds from now to when you next want to run. If you do a regular sleep then you'll actually run less than once a second because sleeps sometimes last longer than expected, and your check takes time. As long as your check takes under a second to run, this should work fine.

hosting - How to run a per second cron job every two minutes - Stack O...

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You can use something like

0 1-59/10 * * * ?

That will trigger the job at any minute and 10 minutes after that. I didn't try it but it looks right. :)

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check the minute your at now and add them as a list to your crontrigger. if you start the trigger at minute 12 for example add

0 2,12,22,32,42,52 * * * ?

as your cron expression

Another solution would be to define a simpletrigger that repeats every ten minutes

SimpleTrigger trigger = new SimpleTrigger("myTrigger",
                                            null,
                                            new Date(),
                                            null,
                                            SimpleTrigger.REPEAT_INDEFINITELY,
                                            10L * 60L * 1000L);

Thanks that would work, but thats not very smart, is not it. I am working on huge application which onstartup will require the CronJob to be started. I dont want to change the cron expression every time i am going to start my application. Do we have some alter solution please?

i fear that the smarter version is not configurable through spring.

you can add @PostContruct before your method, so after your bean is initialized, it runs for the first time.

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Starting from the version 6.1.1 M2E uses its own cron system (not Magento cron). The synchronization tasks are now initiated from M2E pro server. Automatic synchronization is launched every 5 minutes. No additional settings are required for it to be set up. As you told that you have version 6.2.3 then Synchronization should be there automatically. In case if automatic synchronization does not occur then you have to run cron manualy. I had got same problem in my last project. I resolved this problem using following way:

Open Cpanel and add a cron job.

cron

Now, after this if you want to test your cron is running or not then go to

there is a file named as Abstract.php which contains a function process() on line no. 20

You can put a mail() function there and check email id. If you get email after each minute interval then means your cron is running fine. Good Luck

magento - setting up cron job for m2e pro - Stack Overflow

magento cron m2e
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If you want the job to run every 10 minutes between 09:00 and 17:00 then the cron expression should look like this:

0 0/10 9-17 ? * MON-FRI

There's some great documentation on the Quartz site:

Ur expression runs every 10 minutes from 9 to 17. But my requirement is it has to start from Monday 9AM to Friday 7PM

OK. Then you'll need three cron expressions. One covering Mondays covering 09:00-23:59, the second covering 24 hours Tue/Wed/Thur, and a third covering Friday covering 00:00 - 17:00.

is it not possible with a single cron expression? Thanks!

java - complex cron expression to run the quartz job? - Stack Overflow

java spring cron quartz-scheduler
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Do you mean you want the job to start at the given time and then run once hourly forever? If so, I don't think a cron expression is the right approach.

If you're using a scheduler it should be straightforward to start the job and run forever at a given interval. For example, here's a snippet from the Quartz scheduler docs for JobBuilder:

JobDetail job = newJob(MyJob.class)
         .withIdentity("myJob")
         .build();

     Trigger trigger = newTrigger() 
         .withIdentity(triggerKey("myTrigger", "myTriggerGroup"))
         .withSchedule(simpleSchedule()
             .withIntervalInHours(1)
             .repeatForever())
         .startAt(futureDate(10, MINUTES))
         .build();

     scheduler.scheduleJob(job, trigger);

or use a SimpleTrigger

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Run a wrapper every hour which runs your job if the current time is after your start time.

case $(date +%H) in 
    09 |1[0-6] ) pingcheck ;;
esac

would run pingcheck (whatever that is :-) between 09:00 and 16:59.

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Just define a cron expression for every minute and add the fireNow=true parameter. See http://camel.apache.org/quartz.html.

thanks @soilworker but still it's not starting immediately my camel route from config <from uri="quartz2://callEndpoint?fireNow=truecron=0+0/1+*+1/1+*+?+*"/> it's still not calling immediately.

K, the fireNow option only works if you use SimpleTrigger, so you can't use the cronExpression for this option. Maybe you should replace the cronExpression with trigger.repeatCount and trigger.repeatInterval or dont use the quartz component. Maybe the timer component is the better choice for you(see camel.apache.org/timer.html)

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0 0/10 * 1/1 * ? *

While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes.

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0 0/14 * 1/1 * ? *

a greate webstie to create your cron expression when you are in doubt : http://www.cronmaker.com/

it will help you build your cron expression and show you the next firing date times of your cron.

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The simplest approach is just to have a cron job set to run every 10 minutes and determine via a database query which flights now require a reminder e-mail. You can have an additional field in the database such as "REMINDER_SENT" so that you only send an e-mail once.

If you are already using delayed job then the cron job should just call a ruby script which adds a SendReminders job on to the queue. You can then manage all of the db querying, e-mail sending and db updating from a normal delayed job.

This approach saves you having to queue up a large number of future dated events and you don't need to worry about flight times changing or events getting lost. If you miss one event then the next run in 10 minutes will pick up all the flights anyway.

Ruby on Rails - Automated Email Sending - Flight Reminder - Stack Over...

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Yes, Quartz is a good idea if you need to schedule regular async activity (like what you describe) on a regular basis. It doesn't matter that it takes 5 days (or 5 minutes or 5 years) to run, however you should be careful about specifying the recurrance (i.e., the cron expression) so that you're not starting the next round of each job before the previous one has finished. (Quartz can help you here with options like that described in 22.2.2 of http://static.springsource.org/spring/docs/1.2.9/reference/scheduling.html)

On the other hand, if you don't need regular async activity (i.e., just one time or unschedule-able), then it's probably simpler to just define a runnable (even better, use the latest JDK concurrent helpers for less risky implementations).

Scheduling 5-10 parallel Spring quartz jobs - Stack Overflow

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cron
0 0/14 * 1/1 * ? *

This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post.

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First off you have a couple misunderstandings about Cron Expressions. "*/20 * * * * ?" is every twenty seconds as the comment implies, but only because 60 is evenly divisible by 20. "/50 ..." is not every fifty seconds. it is seconds 0 and 50 of every minute. As another example, "/13 ..." is seconds 0, 13, 26, 39, and 52 of every minute - so between second 52 and the next minute's 0 second, there is only 8 seconds, not 13. So with */50 you'll get 50 seconds between every other firing, and 10 seconds between the others.

That however is not the cause of your rapid firing of the job. The problem is that the current second is "50" and you are scheduling the new trigger to fire on second "50", so it immediately fires. And then it is still second 50, and the job executes again, and it schedules another trigger to fire on second 50, and so on, as many times as it can during the 50th second.

You need to set the trigger's start time into the future (at least one second) or it will fire on the same second you are scheduling it, if the schedule matches the current second.

Also if you really need every "N" seconds type of schedule, I suggest SimpleTrigger rather than CronTrigger. SimpleTrigger can do "every 35 seconds" or "every 50 seconds" no problem. CronTrigger is meant for expressions like "on seconds 0, 15, 40 and 43 of minutes 15 and 45 of the 10 o'clock hour on every Monday of January".

makes sense, i changed the code of the test app and it is now behaving as i expected... thanks a lot

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