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java.lang.Object
   |
   +----edu.utah.janos.antsr.route.DynamicRouteEvents

Summary

class  DynamicRouteEvents
     extends java.lang.Object
{
          // Fields 9
     private static final int EXPIREINTERVAL;
     private static final int GCINTERVAL;
     private static final long RCRESOLUTION;
     private static final int SECONDS;
     private static final int TRIGGERINTERVAL;
     private static final int TRIGGERSPREAD;
     private static final int UPDATEINTERVAL;
     private static final int UPDATESPREAD;
     private final Vector events;

          // Constructors 1
     DynamicRouteEvents();

          // Methods 12
     static long eventTime(long, long, long);

     public void clearExpireTimer(long);
     public void clearGCTimer(long);
     public void clearTimer(DynamicRouteEvent);
     public DynamicRouteEvent findFirstTimer();
     DynamicRouteEvent findTimer(long);
     boolean isEmpty();
     public void setExpireTimer(DynamicRouteEntry, long);
     public void setGCTimer(DynamicRouteEntry, long);
     public void setPeriodicTimer(long);
     public DynamicRouteEvent setTimer(long, int);
     public void setTriggerTimer(long);
}

Event queue for the dynamic route table. Also contains all of the timeout-related constants.

Fields

· RCRESOLUTION

Summary  |  Top

   private static final long RCRESOLUTION

eventTime() rounds all timers to this granularity (in milliseconds).

See Also: eventTime

   private static final int SECONDS

   private static final int EXPIREINTERVAL

   private static final int GCINTERVAL

   private static final int UPDATEINTERVAL

   private static final int UPDATESPREAD

   private static final int TRIGGERINTERVAL

   private static final int TRIGGERSPREAD

   private final Vector events

Store of timer events. Each event is a DynamicRouteEvent. Not sorted or in any particular order (probably never long enough to justify). There is exactly one event set to expire for any given time.

Used for expire, GC and periodic timers.

See Also: findTimer, findFirstTimer, setTimer, clearTimer

Constructors

· DynamicRouteEvents

Summary  |  Top

   DynamicRouteEvents() 

   boolean isEmpty() 

   static long eventTime(long base, 
                         long add, 
                         long spread) 

Compute a route event clock time. All returned times are snapped to granularity of RCRESOLUTION.

Parameter	Description
base	Generally 'now'.
add	offset to add to base
spread	for randomizing the time a bit.

   DynamicRouteEvent findTimer(long when) 

Find a DynamicRouteEvent set to go off at "when".

Finds the first such event.

There is only ever be one (or zero) DynamicRouteEvent in the queue with a timer that matches when.

   public DynamicRouteEvent findFirstTimer() 

Find the event in the timer queue with the shortest timer.

   public DynamicRouteEvent setTimer(long when, 
                                     int type) 

Add a new timer to the event queue.

Reuses existing timers if one is set to go off at the same time.

   public void clearTimer(DynamicRouteEvent r) 

Remove the given DynamicRouteEvent from the list.

Parameter	Description
r	the event to remove

   public void setExpireTimer(DynamicRouteEntry r, 
                              long now) 

Add a expire timer to go off after a constant EXPIREINTERVAL. XXX can see RouteEntry.

See Also: EXPIREINTERVAL

   public void clearExpireTimer(long when) 

Clear a expire timer from the event queue. The event found at 'when' had best be a expire event with a non-zero expire count, thank you very much.

Parameter	Description
when	when the timer was scheduled to go off.

   public void setGCTimer(DynamicRouteEntry route, 
                          long now) 

Add a GC timer to go off a constant GCINTERVAL from now. Update the given route to 'expire' at that time. XXX can see RouteEntry.

   public void clearGCTimer(long when) 

Clear a GC timer from the event queue. There had best be a GC timer at moment when.

   public void setPeriodicTimer(long now) 

Add a periodic timer to go off at UPDATEINTERVAL +/- UPDATESPREAD millis after 'now'.

See Also: UPDATESPREAD, UPDATEINTERVAL

   public void setTriggerTimer(long base) 

Add a trigger timer to go off at TRIGGERINTERVAL +/- TRIGGERSPREAD millis after 'base'.

Sets the 'trigger' member to true.

See Also: TRIGGERINTERVAL, TRIGGERSPREAD

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