[Koha-bugs] [Bug 30410] Add a way for plugins to register background tasks

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=30410

--- Comment #11 from Kyle M Hall <kyle at bywatersolutions.com> ---
Created attachment 133193
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=133193&action=edit
Bug 30410: Add a way for plugins to expose tasks they implement

This patch implements a mechanism for plugins to tell Koha they
implement background jobs, by returning a mapping

```
    task => class
```

* _task_ is a string that will be used when queueing new tasks, to let
  the workers know which class to instantiate to launch the job (a.k.a.
  process).

* _class_ is a string for a class name.

For this to  work, plugins need to include the 'namespace' attribute in
their metadata. If they don't, they will be skipped when listing the
valid _background jobs_.

After this, high-level methods for letting plugins (easily) enqueue
their tasks will be provided.

To test:
1. Apply this patch
2. Run:
   $ kshell
  k$ prove t/db_dependent/Koha/Plugins/BackgroundJob.t
=> SUCCESS: Tests pass!
3. Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen at theke.io>

Signed-off-by: Kyle M Hall <kyle at bywatersolutions.com>

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