Add possibility to schedule jobs

[manisi]

Overview of the feature request

for execute certain task in the background that should be executed at predefined intervals of time .

Motivation for or Use Case

Related issues or PR

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[nicolas63]

Do you need jhipster for that ? You can use https://www.hangfire.io/.

[manisi]

https://www.hangfire.io/

i think embed in jhipster generator like Quartz.net is simpler than hangfire. Thanks

[nicolas63]

Yes maybe, but what is the added value of generating this part ? Add the nuget and expose the configuration ? If it's just for that I think developers can do it

[manisi]

some time the first generated jhipster app need to use execute jobs. for example : the not active user must be deleted before 2 days ago. and the other hand yes add nuget package and use it. Thanks

[nicolas63]

If you need pre-made it's ok for me
Do you want work on it ?

[manisi]

If you need pre-made it's ok for me
Do you want work on it ?

ok ,i hope i can do it .

[nicolas63]

If you need help, don't hesitate to ping me

[maznag]

We can use integrated .Net Core HostedService to implement background task rather than use of external package

And use of Cronos package to parse Cron expressions and calculating next occurrences.

[nicolas63]

the main advantage of the hangfire is that you can also have an admin part with the cron states, monitoring etc...
The persistence of the jobs is also a good feature

[ivanmonteiro]

It would be interesting if the job scheduler could work properly when we horizontally scale the application (running the app on 3 servers, as example). We don't want the same job running on all servers. That would waste resources and lead to problems.

It seems that hangfire.io supports this scenario: https://docs.hangfire.io/en/latest/background-processing/running-multiple-server-instances.html

What I have not liked about hangfire.io is that the supported storage options are MSSQL and Redis only (https://docs.hangfire.io/en/latest/#job-storage). But I'm not sure it is a problem. I have not used hangfire.io before.

Edit:
It seems that hangfire.io supports many persistent storage options (https://www.hangfire.io/extensions.html).

[ivanmonteiro]

Quartz.Net also seems interesting and worth investigating. It supports job persistence (in memory and database by ado.net), fail retry and, clustering (multi-server).
See: https://www.quartz-scheduler.net/

[ivanmonteiro]

My opinion is that the job shceduling solution should:

• start simple (no need of dependency on redis or external server at first)

And allow more complex scenarios such as:

• (optionally?) allow persistence - adds robustness tor the application and is useful for server reboots, failover and retry
• (optionally?) work on multi-server applications. This is optional, but it is important for scalability.

Both hangfire.io and Quartz.Net seems to have its pros and cons.
Quartz.Net seems simple at first with in-memory persistence.
Hangfire.io has more features (dashboard, etc) but the basic setup seems more complex as it needs eiher Redis or database persistence.

@maznag @nicolas63 You both have interesting ideas, please share what you think.