Get project label expression in RunListener

[Gary Yao]

Hi Jenkins Dev

I inherited a plugin which implements RunListener to onComplete.

I have a new requirement to get the label expression defined in the project where build is restricted to run from.

How can I go from onCompleted(Run build, TaskListener listener) to the information of "Restrict where this project can be run => Label Expression"?

Thanks very much!

Gary

[Jesse Glick]

On Wed, Aug 8, 2018 at 8:00 AM Gary Yao <gary...@gmail.com> wrote:
> I have a new requirement to get the label expression defined in the project where build is restricted to run from.
>
> How can I go from onCompleted(Run build, TaskListener listener) to the information of "Restrict where this project can be run => Label Expression"?

If the `build instanceof AbstractBuild` (i.e., not Pipeline), then you
will find a method for that.

[Gary Yao]

Thanks Jessi, actually build is instanceof hudson.model.Run, 

What kind of method should I be looking for? Sorry, I am new to the jenkins class hierarchy.

[Jesse Glick]

On Thu, Aug 9, 2018 at 2:44 PM Gary Yao <gary...@gmail.com> wrote:
> actually build is instanceof hudson.model.Run

Of course—that is the defined supertype. I noted that you must check
an `instanceof` expression to see if it is not a Pipeline build (which
would work entirely differently).

> What kind of method should I be looking for?

http://javadoc.jenkins.io/hudson/model/AbstractProject.html#getAssignedLabelString--

[Gary Yao]

Thanks Jesse, that solved the problem.

labelExpression = ((AbstractProject)run.getParent()).getAssignedLabelString()

:thumbup:

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[Jesse Glick]

On Fri, Aug 10, 2018 at 1:35 AM Gary Yao <gary...@gmail.com> wrote:
> labelExpression = ((AbstractProject)run.getParent()).getAssignedLabelString()

Again this will throw a `ClassCastException` whenever a Pipeline build
completes unless you guard it with

if (run instanceof AbstractBuild) {