Yes, it’s true. In Quartz.Net 2.0 the IStatefulJob has been marked as obsolete. To be sure, it’s still available to use, but if you are using IStatefulJobs you should think about migrating them to use the new Quartz.Net 2.0 features.
The Disallow Concurrent Execution Attribute
So how do I implement an IStatefulJob in Quartz.Net 2.0? Fortunately, it’s not very hard to do. You just need to mark your IJob with the new DisallowConcurrentExecutionAttribute. Any jobs that have this attribute set are only allowed to run one instance of the job at a time. Keep in mind that an instance is defined by a JobKey (job name and group combination), which means that if you have the same job type scheduled with a different job name or a different job group, you may get more than one instance of that type of job running at the same time.
The Persist Job Data After Execution Attribute
Seems simple enough so far? Well, it is! There is only one other thing to consider. If you want the scheduler to persist the job’s state between executions, you must also add the PersistJobDataAfterExecutionAttribute to the class. This attribute tells the scheduler that you would like for it store the job’s JobDataMap once it is finished executing.
One Last Thing
While you can use each of these attributes separately, if you are going to use the PersistJobDataAfterExecutionAttribute to persist your job’s state, you should always use the DisallowConcurrentExecutionAttribute, because if you don’t, you might find that your job state is corrupted due to race conditions.