: Class EventTimer

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Class EventTimer

java.lang.Object
  |
  +--EventTimer

public class EventTimer
extends java.lang.Object

A class used to assign random times to all of the events which take place in the lunch-seating simulation. Because two seating schemes will be compared, it is important that both schemes have the same input: that each party which will arrive has the same arrival time between schemes, and that both eating times are equivalent. This may be accomplished by seeding the random number generators.

See Also:: Party, Clock, Event

Field Summary
`private java.util.Random`	`arrivalTimer` A random number generator to generate arrival times
`private java.util.Random`	`eatingTimer` A random number generator to generate eating times
`static int`	`LUNCH_TIME` The number of minutes that lunch is served on the cruise ship
`static int`	`MAX_EATING_TIME` The maximum amount of time a party can take to eat their lunch
`static int`	`MIN_EATING_TIME` The minimum amount of time a party can take to eat their lunch

Constructor Summary
`EventTimer()` Creates a new, non-seeded EventTimer
`EventTimer(long seed1, long seed2)` Creates a new EventTimer.

Method Summary
`double`	`nextArrivalTime()` Returns a pseudo-random number in the range [0, LUNCH_TIME]
`double`	`nextEatingTime()` Returns a pseudo-random number in the range [MIN_EATING_TIME, MAX_EATING_TIME]

Methods inherited from class java.lang.Object

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

Field Detail

MIN_EATING_TIME

public static final int MIN_EATING_TIME

The minimum amount of time a party can take to eat their lunch

MAX_EATING_TIME

public static final int MAX_EATING_TIME

The maximum amount of time a party can take to eat their lunch

LUNCH_TIME

public static final int LUNCH_TIME

The number of minutes that lunch is served on the cruise ship

arrivalTimer

private java.util.Random arrivalTimer

A random number generator to generate arrival times

eatingTimer

private java.util.Random eatingTimer

A random number generator to generate eating times

Constructor Detail

EventTimer

public EventTimer()

Creates a new, non-seeded EventTimer

EventTimer

public EventTimer(long seed1,
                  long seed2)

Creates a new EventTimer. The parameters are used to seed the pseudo-random number generators which are used to produce the various times.

Parameters:: seed1 - the seed for the arrival timer; seed2 - the seed for the eating timer

Method Detail

nextArrivalTime

public double nextArrivalTime()

Returns a pseudo-random number in the range [0, LUNCH_TIME]

nextEatingTime

public double nextEatingTime()

Returns a pseudo-random number in the range [MIN_EATING_TIME, MAX_EATING_TIME]