vanetsim.scenario.KnownVehiclesList Class Reference

Public Member Functions
	KnownVehiclesList ()
synchronized void	updateVehicle (Vehicle vehicle, long ID, int x, int y, double speed, long sourceID, boolean isEncrypted, boolean isARSU)
void	checkOutdatedVehicles ()
Vehicle	findNearestVehicle (int vehicleX, int vehicleY, int destX, int destY, int maxDistance)
KnownVehicle[]	getFirstKnownVehicle ()
int	getSize ()
void	clear ()

Static Public Member Functions
static void	setTimePassed (int time)

Detailed Description

A list of all known vehicles which was discovered through beacons. In contrast to the KnownPenalties- class, an own class is used for storing the information about the vehicles. Although this means slightly more overhead, it should not be a big case and allows better extensibility.
A simple hash algorithm based on the vehicle ID is used to get better performance. The hash determines the corresponding linked list(beginnings of linked lists are found in head_). Known vehicles with the same hash are connected together through their next_ and previous_ values (see KnownVehicle-class).

Constructor & Destructor Documentation

vanetsim.scenario.KnownVehiclesList.KnownVehiclesList ( )

inline

Empty constructor.

Member Function Documentation

void vanetsim.scenario.KnownVehiclesList.checkOutdatedVehicles ( )

inline

Checks if a vehicle is too old so that it can be removed. Note that this function is not synchronized! You need to make sure that no other thread uses any function on this object at the same time!

void vanetsim.scenario.KnownVehiclesList.clear ( )

inline

Clears everything from this data structure.

Vehicle vanetsim.scenario.KnownVehiclesList.findNearestVehicle ( int  vehicleX, int  vehicleY, int  destX, int  destY, int  maxDistance  )

inline

Finds the nearest known vehicle to a destination.

Parameters

vehicleX	the x coordinate of the calling vehicle
vehicleY	the y coordinate of the calling vehicle
destX	the x coordinate of the destination
destY	the y coordinate of the destination
maxDistance	the maximum distance the nearest vehicle max have from the calling vehicle

Returns

the nearest vehicle or null if the calling vehicle is the nearest

KnownVehicle [] vanetsim.scenario.KnownVehiclesList.getFirstKnownVehicle ( )

inline

Gets an hashed array with known vehicles (array length depends on the HASH_SIZE). You can iterate through all known vehicles by using getNext() until you get to a null element on all elements of this array

Returns

the array with known vehicles

int vanetsim.scenario.KnownVehiclesList.getSize ( )

inline

Gets the amount of known vehicles stored.

Returns

the size

static void vanetsim.scenario.KnownVehiclesList.setTimePassed ( int  time )

inlinestatic

Sets the time passed since simulation start.

Parameters

time	the new time in milliseconds

synchronized void vanetsim.scenario.KnownVehiclesList.updateVehicle ( Vehicle  vehicle, long  ID, int  x, int  y, double  speed, long  sourceID, boolean  isEncrypted, boolean  isARSU  )

inline

Update a vehicle or add it if it doesn't exist yet.

Parameters

vehicle	a reference to the vehicle
ID	the ID of the vehicle
x	the x coordinate
y	the y coordinate
speed	the speed
sourceID	ID of the source
isEncrypted	if Beacon was encrypted
isARSU	if Beacon was sent from an ARSU

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The documentation for this class was generated from the following file:

• /Users/andreastomandl/Desktop/Vanet-Sim/Simulator/src/vanetsim/scenario/KnownVehiclesList.java