Prioritize Jenkins Build via Groovy Postbuild - jenkins

Question

I want to schedule a job to be at the top of the build queue in Jenkins via a Groovy Postbuild.
For example, for Build X
If previously the build queue looks like this:
Generic Build 1
Generic Build 2
Generic build 3
Now it should look like:
Build X
Generic Build 1
Generic Build 2
Generic Build 3
So far I've been able to schedule the job using
def waitingItem = Jenkins.get().getQueue().schedule(job, 0)
if (waitingItem == null) {
manager.listener.logger.println "Error scheduling ${job}!"
} else {
manager.listener.logger.println "${job.name} was scheduled!"
}
but now I also want waitingItem to be at the top of the queue.
Any help is much appreciated.

Answer 1

Ok so after countless hours of browsing the web I've been able to come up with a Groovy Postbuild script that does the following: once it finishes the build, it triggers another build (let's call it buildToBeTriggered) and buildToBeTriggered automatically gets pushed at the front of the queue.
The code is below:
import hudson.model.AbstractProject
import hudson.model.Queue
import hudson.model.queue.QueueSorter
import jenkins.model.Jenkins
def job = (AbstractProject)Jenkins.get().getItem('gcimpoies-toTrigger')
def isSuccess = manager.getResult() == 'SUCCESS'
def isRelease = manager.getEnvVariable('RELEASE') == 'true'
def secondsToWait = 20
if (isSuccess) {
def waitingItem = Jenkins.get().getQueue().schedule(job, 0)
if (waitingItem == null) {
manager.listener.logger.println "Error scheduling ${job}!"
} else {
manager.listener.logger.println "${job.name} was scheduled!"
}
Thread.sleep(secondsToWait * 1000)
//replace the original queue sorter with one that will place our project build first in the queue
QueueSorter originalQueueSorter = Jenkins.get().getQueue().getSorter()
AcceleratedBuildNowSorter acceleratedBuildNowSorter = new AcceleratedBuildNowSorter(job, originalQueueSorter)
Jenkins.get().getQueue().setSorter(acceleratedBuildNowSorter);
// we sort the queue so that our project is next to be built on the list
Jenkins.get().getQueue().getSorter().sortBuildableItems(Jenkins.getInstance().getQueue().getBuildableItems())
}
class AcceleratedBuildNowSorter extends QueueSorter {
private final AbstractProject project
private final QueueSorter originalQueueSorter
private final AcceleratedBuildNowComparator comparator
AcceleratedBuildNowSorter(AbstractProject project, QueueSorter originalQueueSorter) {
this.project = project
this.originalQueueSorter = originalQueueSorter
comparator = new AcceleratedBuildNowComparator(this.project)
}
#Override
void sortBuildableItems(List<Queue.BuildableItem> buildables) {
if (this.originalQueueSorter != null) {
this.originalQueueSorter.sortBuildableItems(buildables)
}
Collections.sort(buildables, comparator)
}
}
class AcceleratedBuildNowComparator implements Comparator<Queue.BuildableItem> {
private final AbstractProject mostPriorityProject;
AcceleratedBuildNowComparator(AbstractProject mostPriorityProject) {
this.mostPriorityProject = mostPriorityProject;
}
int compare(Queue.BuildableItem buildableItem0, Queue.BuildableItem buildableItem1) {
AbstractProject<?, ?> project0 = (AbstractProject<?, ?>) buildableItem0.task
AbstractProject<?, ?> project1 = (AbstractProject<?, ?>) buildableItem1.task
if (project0.equals(mostPriorityProject)) {
return -1
}
if (project1.equals(mostPriorityProject)) {
return 1
}
return 0
}
}