lejos.realtime
Class DMScheduler

java.lang.Object
  extended by lejos.realtime.Scheduler
      extended by lejos.realtime.PriorityScheduler
          extended by lejos.realtime.DMScheduler

public class DMScheduler
extends PriorityScheduler

Author:
Team iRboT

Method Summary
static PriorityScheduler instance()
          Return a reference to the distinguished instance of PriorityScheduler which is the system's base scheduler.
 boolean isFeasible()
          Queries this scheduler about the feasibility of the set of schedulable objects currently in the feasibility set.
 
Methods inherited from class lejos.realtime.PriorityScheduler
fireSchedulable, getMaxPriority, getMaxPriority, getMinPriority, getMinPriority, getNormPriority, getNormPriority, getPolicyName, setIfFeasible, setIfFeasible, setIfFeasible
 
Methods inherited from class lejos.realtime.Scheduler
getDefaultScheduler, setDefaultScheduler
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Method Detail

instance

public static PriorityScheduler instance()
Return a reference to the distinguished instance of PriorityScheduler which is the system's base scheduler.

Returns:
A reference to the distinguished instance PriorityScheduler.

isFeasible

public boolean isFeasible()
Description copied from class: PriorityScheduler
Queries this scheduler about the feasibility of the set of schedulable objects currently in the feasibility set. Implementation Notes: The default feasibility test for the PriorityScheduler considers a set of schedulable objects with bounded resource requirements, to always be feasible. This covers all schedulable objects with release parameters of types PeriodicParameters and SporadicParameters. If any schedulable object within the feasibility set has release parameters of the exact type AperiodicParameters (not a subclass thereof), then the feasibility set is not feasible, as aperiodic release characteristics require unbounded resources. In that case, this method will return false and all methods in the setIfFeasible family of methods will also return false. Consequently, any call to a setIfFeasible method that passes a schedulable object which has release parameters of type AperiodicParameters, or passes proposed release parameters of type AperiodicParameters, will return false. The only time a setIfFeasible method can return true, when there exists in the feasibility set a schedulable object with release parameters of type AperiodicParameters, is when the method will change those release parameters to not be AperiodicParameters. Implementations may provide a feasibility test other than the default test just described. In which case the details of that test should be documented here in place of this description of the default implementation. Specified by: isFeasible in class @see Scheduler

Overrides:
isFeasible in class PriorityScheduler
Returns:
True, if the system is feasible. False, if not.