What is exactly mean by 'DisallowConcurrentExecution' in Quartz.net

c# quartz.net job-scheduling
Ishtiaq picture Ishtiaq · Apr 30, 2014 · Viewed 11.1k times · Source

I have a Quartz.net Job with the following definition.

    [PersistJobDataAfterExecution]
    [DisallowConcurrentExecution]
    public class AdItemsJob : IJob, IInterruptableJob
    {

        public void Execute(IJobExecutionContext context)
        { 
         // Job execution logic,

        }
   }

As I have decorated the Job with DisallowConcurrentExecution attribute.
What I know about this attribute, we can't run multiple instances of same job at the same time. What is meant by multiple instances here.?
Does the two jobs of AddItemsJob with different key are called same instances or different instances.?
Does two jobs with different key can execute at the same time.?

Answer

Marko Lahma picture Marko Lahma · Apr 30, 2014

A job instance is a job with unique key. So having a job of type AddItemsJob can have two instances with keys AddItemsJob.Admin and AddItemsJobs.Legacy. The concurrency protection comes per job key - the aforementioned two jobs could run simultaneously if they were defined with overlapping triggers. Having a single job defined behind single key would not run simultaneously even if there were multiple triggers having overlapping schedules associated with it.

Related questions

Simple, working example of Quartz.net

I am looking for a working simple example of Quartz.net for Console application (it can be any other application as long as it simple enough...). And while I am there, is there any wrapper that could help me avoid …

Read More
Quartz.net Simple Example

I'm trying to find a simple Quartz.Net example where when a button is clicked, it kicks off the Quartz.Net functionality. I was able to take the Quartz.Net example (console application) and change some things to produce this (…

Read More
CronExpressions - any librarys out there to generate them/convert them into human readable form?

I am using Quartz.NET, and my scheduler relies heavily on the use of cron expression's - such as the ones detailed on this link: http://quartznet.sourceforge.net/tutorial/lesson_6.html Ideally, I'd like the 2 scenarios to be made …

Read More