Would you please explain to me the exact mean of the StatefulJob in quartz and it's difference with none StatefulJob?
StatefulJob interface, provides 2 things,
first: only one job will be run any time
second: in (SimpleTriggerBean) you will not worry about your job running duration. it means that the next run will be done after delay time after ending of previous one.
StatefulJob guarantees only one job will be running at one time. For example, if you schedule your job to run every 1 minute, but your job took 5 minutes to complete, then the job will not be run again until the previous job has completed.
This is useful to make sure there is only one job running at any given time.
The next job will be run on the next schedule, not immediately after the previous job completed.
jobDetail.getJobDataMap().put("type","FULL");
This line is will decide we are using statefull or non-statefull.
If we are passing the argument then it will be statefull.
With out statefull there is no way to pass the arguments in execute method
In state full while execution time if we modify any value then the execution job will be lost it wont re-triggered at simultaneous process time.
Only one job will execute at a time the second will be sleep until the first one is completed.
In multi scheduling process the second job argument will be share to first job at run time. this is one type of disadvantage in multi scheduling process.
Related
I have a QUARTZ JOB which is starts every 10 minutes.
If a JOB doesn't finish in 10 minutes, in the next 10th minute another JOB will start.
What I want is: the next JOB (after every 10 minute) should start only, if the previous JOB has finished running. Is there any way to do it?
Quartz Documentation
#DisallowConcurrentExecution is an annotation that can be added to the
Job class that tells Quartz not to execute multiple instances of a
given job definition (that refers to the given job class)
concurrently. Notice the wording there, as it was chosen very
carefully. In the example from the previous section, if
"SalesReportJob" has this annotation, than only one instance of
"SalesReportForJoe" can execute at a given time, but it can execute
concurrently with an instance of "SalesReportForMike". The constraint
is based upon an instance definition (JobDetail), not on instances of
the job class. However, it was decided (during the design of Quartz)
to have the annotation carried on the class itself, because it does
often make a difference to how the class is coded.
If you dont want SalesReportForMike and SalesReportForJoe to run concurrently ,then you can set the scheduler's ThreadPool size to 1. So at any given time only one job will run.
Also take a look at StatefulJob
Take a look at the DisallowConcurrentExecution annotation which will prevent multiple instances of the same job to run at the same time.
I have a Quartz trigger that is set to execute a process every minute.
Since concurrent is set to false, if the process takes longer than a minute, future triggers are prevented. However, does this mean that the trigger that attempted to run is now "standing in line" and waiting to be executed?
For example, if the process takes 10 minutes to execute, will there be 10 triggers sitting there waiting to execute. I am attempting to prevent a buildup on the server.
No. If concurrency is set to false (with anottation #DisallowConcurrentExecution) further jobs won't start if actual is still running.
See Job State and Concurrency in docu.
The accepted answer is not correct.
I just did the test with quartz 2.2.3 and the jobs are indeed put on the back burner.
Meaning if the time to process the job is superior to the time between jobs, you will pile up the jobs.
The documentation provided by #1ac0 is not mentioning anything apart the job will not run 'immediately'.
I have started using quartz scheduler in my application.I want to know whether we can find the actual start time of a scheduler and the actual time at which the scheduler ends.
You can use a JobListener for that.
The method jobToBeExecuted runs before the job starts and jobWasExecuted after it ends.
EDIT:
To further expand on the issue:
You can use the JobDetail object to store data about the job (look at getJobDataMap).
jobToBeExecuted method is called automatically each time the job is about to execute and it accepts a JobExecutionContext which has a method getJobDetails (look at section 1)
Same goes for jobWasExecuted, only this one is called after the job finished.
Look here for further information.
How can I handle the "exceptions" caused by a job run by Quartz scheduler so that it is run on the following scheduled time. I don't want it to refireImmediately or I don't want it to drop this job. Just keep it in the jobstore until its next turn.
If you throw an exception from a Job and it is not JobExecutionException with refireImmediately set, this execution will be discarded and proceed with normal schedule. E.g. when a job is suppose to run every 10 seconds and a single execution threw an exception, Quartz will simply discard this exceution and run next one after 10 seconds.
Unfortunately the only way of refiring with some delay is a custom code (maybe a JobListener implementation?), refireImmediately does what it says. It is a pity Quartz does not support it out-of-the-box.
See a proposed solution here (but not the accepted answer): Quartz retry when failure.
Simple question, I think.
I have org.springframework.scheduling.quartz.CronTriggerBean triggering one job once a day. Because this method can last a long time (over 24 hours), will the next day at the same time a new job be executed if the last one is not ended yet?
If yes - is it possible to turn off executing new jobs until the last one is finished?
My method is trans-coding videos and some days there a lot of videos and could last long.
Make the Job stateful, So it will prevent the new instance before the previous instance of the job ended.
You 'mark' a Job as stateful by having it implement the StatefulJob interface.
You will get more about stateful job here