Package hudson.plugins.ec2

Class EC2HotSpareQueueListener

java.lang.Object

hudson.model.queue.QueueListener

hudson.plugins.ec2.EC2HotSpareQueueListener

All Implemented Interfaces:

ExtensionPoint

@Extension
public class EC2HotSpareQueueListener
extends QueueListener

Asks for a hot spare pass as soon as a build is ready to run.

Without this, the first build for a label that has nothing warm has to wait for the periodic sweep before any spare is even requested, and the label's own agents cannot fill the gap: an executor being taken is the other trigger, and with no capacity there is no executor to take. That is minutes of latency spent on exactly the case the spares exist to cover.

Queue.BuildableItem is in the queue's buildable list by the time this runs, so the pass this schedules counts it. No provisioning decision is made here: this runs under the Queue lock, where the only safe thing to do is hand the work to MinimumInstanceChecker.scheduleCheck() and return.

Nested Class Summary

Nested classes/interfaces inherited from interface hudson.ExtensionPoint

ExtensionPoint.LegacyInstancesAreScopedToHudson

Constructor Summary

Constructors

Constructor	Description
EC2HotSpareQueueListener()

Method Summary

Modifier and Type	Method	Description
void	onEnterBuildable(Queue.BuildableItem item)

Methods inherited from class hudson.model.queue.QueueListener

all, onEnterBlocked, onEnterWaiting, onLeaveBlocked, onLeaveBuildable, onLeaveWaiting, onLeft

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

EC2HotSpareQueueListener

public EC2HotSpareQueueListener()

Method Details

onEnterBuildable

public void onEnterBuildable(Queue.BuildableItem item)

Overrides:

onEnterBuildable in class QueueListener