Examples of hudson.model.Queue

hudson.model.Queue
Build queue.
This class implements the core scheduling logic. {@link Task} represents the executabletask that are placed in the queue. While in the queue, it's wrapped into {@link Item}so that we can keep track of additional data used for deciding what to exeucte when.
Items in queue goes through several stages, as depicted below:
```
 (enter) --> waitingList --+--> blockedProjects |        ^ |        | |        v +--> buildables ---> pending ---> (executed) 
```
In addition, at any stage, an item can be removed from the queue (for example, when the user cancels a job in the queue.) See the corresponding field for their exact meanings. @author Kohsuke Kawaguchi

        Jenkins jenkins = Jenkins.getInstance();
        if (jenkins == null) {
            return;
        }


        Queue q = jenkins.getQueue();


        // if the build is still in the queue, abort it.
        // BuildTriggerListener will report the failure, so this method shouldn't call getContext().onFailure()
        for (Queue.Item i : q.getItems()) {
            BuildTriggerAction bta = i.getAction(BuildTriggerAction.class);
            if (bta!=null && bta.getStepContext().equals(getContext())) {
                q.cancel(i);
            }
        }


        // if there's any in-progress build already, abort that.
        // when the build is actually aborted, BuildTriggerListener will take notice and report the failure,

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                return Result.ABORTED;
            } catch (AggregatorFailureException e) {
                return Result.FAILURE;
            } finally {
                // if the build was aborted in the middle. Cancel all the configuration builds.
                Queue q = Hudson.getInstance().getQueue();
                synchronized (q) {// avoid micro-locking in q.cancel.
                    for (MatrixConfiguration c : activeConfigurations) {
                        if (q.cancel(c)) {
                            logger.println(Messages.MatrixBuild_Cancelled(c.getDisplayName()));
                        }
                        MatrixRun b = c.getBuildByNumber(n);
                        if (b != null) {
                            Executor exe = b.getExecutor();

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        this.task = task;
    }


    @Override
    public boolean cancel(boolean mayInterruptIfRunning) {
        Queue q = Hudson.getInstance().getQueue();
        synchronized (q) {
            synchronized (this) {
                if(!executors.isEmpty()) {
                    if(mayInterruptIfRunning)
                        for (Executor e : executors)
                            e.interrupt();
                    return mayInterruptIfRunning;
                }
                return q.cancel(task);
            }
        }
    }

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    @Initializer(after=JOB_LOADED)
    public static void installDefaultQueueSorter() {
        ExtensionList<QueueSorter> all = all();
        if (all.isEmpty())  return;


        Queue q = Hudson.getInstance().getQueue();
        if (q.getSorter()!=null)        return; // someone has already installed something. leave that alone.


        q.setSorter(all.get(0));
        if (all.size()>1)
            LOGGER.warning("Multiple QueueSorters are registered. Only the first one is used and the rest are ignored: "+all);
    }

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