Yes, Have a look at the code for the Jenkins-Throttle plugin. https://wiki.jenkins-ci.org/display/JENKINS/Throttle+Concurrent+Builds+Plugin
It extends "QueueTaskDispatcher" that is an abstract class with the methods 'canTake' and 'canRun' to allow your code to determine if the build in the queue is or not ready for building. Kind Regards, mgimza On Wed, Aug 22, 2012 at 12:27 PM, ThomasBrouwer <[email protected]>wrote: > Hi! > > I was wondering whether there is an extension point that, just before > building the job, lets you decide to put it back into the queue. > Also, is there a way of stopping a running job and put it back into the > queue, without the job passing/failing/etc? So it should just silently go > back into the queue from running. > > Currently I am using the QueueTaskDispatcher extension point, but the > problem with this is that it gets called once for every execution slot set > up in the entire Jenkins server, and my code should really only run once > (as in, run the code, and if it passes it should always get an execution > slot immediately, and if it fails simply goes back into the queue). > > A little context: > I am making a plugin that allows you to acquire resources (similar to the > Exclusion plugin), but allows you to specify multiple resources of the same > type by adding them to a category. So we could have a category category_1, > with labels label_1 and label_2. Then a job can specify that it needs a > label from category_1 (and it can say it needs multiple categories too), > and then it might get label_1 allocated (as an environmental variable). > Currently I do this allocation in the QueueTaskDispatcher class, but if its > functions get called four times it means four labels are allocated rather > than one. Normally one would do that in a build step, just like the > Exclusion plugin, but we don't want a job to take up an execution slot > while waiting for a resource to become available. This could be solved by > answering my second question though, as I could then just put the job back > into the queue if it turns out the resource(s) is/are not available. > > Thanks for helping! :) > Thomas Brouwer >
