org.hawkular.agent.monitor.scheduler

Class ScheduledCollectionsQueue<L,T extends MeasurementType<L>>

java.lang.Object

org.hawkular.agent.monitor.scheduler.ScheduledCollectionsQueue<L,T>

public class ScheduledCollectionsQueue<L,T extends MeasurementType<L>>
extends Object

A priority queue that organizes measurement collections such that the next collection that needs to be made is at the head of the queue.

Author:

John Mazzitelli

Constructor Summary

Constructors

Constructor and Description
ScheduledCollectionsQueue()

Method Summary

Modifier and Type	Method and Description
long	getNextExpectedCollectionTime() Returns the time when the next collection is to be done.
Set<MeasurementInstance<L,T>>	popNextScheduledSet() Pops off of the queue the set of the next measurements to be collected.
void	schedule(Collection<ScheduledMeasurementInstance<L,T>> schedules) Puts the given schedules in the queue to be prioritized for collection.
void	unschedule(Collection<Resource<L>> resources) Unschedules all measurement collections for all given resources.

Methods inherited from class java.lang.Object

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

Constructor Detail

ScheduledCollectionsQueue

public ScheduledCollectionsQueue()

Method Detail

getNextExpectedCollectionTime

public long getNextExpectedCollectionTime()

Returns the time when the next collection is to be done. If there are no scheduled collections at all, this returns Long#MIN_VALUE. Nothing is popped off the queue by this method.

Returns:

the time when the next expected collection time is to be

popNextScheduledSet

public Set<MeasurementInstance<L,T>> popNextScheduledSet()

Pops off of the queue the set of the next measurements to be collected. The returned set will be those measurements to be collected at the same time (see getNextExpectedCollectionTime()) but could be across multiple resources. A new set of measurements will be rescheduled according to their intervals and pushed back on the queue. If the next scheduled set of collections is to occur in the future or there are no schedules at all then this returns an empty set. In other words, this returns those collections that need to be performed now.

Returns:

the next set of collections that need to be made

schedule

public void schedule(Collection<ScheduledMeasurementInstance<L,T>> schedules)

Puts the given schedules in the queue to be prioritized for collection.

Parameters:

schedules - the new schedules to add

unschedule

public void unschedule(Collection<Resource<L>> resources)

Unschedules all measurement collections for all given resources.

Parameters:

resources - all measurements for all these resources will be unscheduled