es.ants.felixgm.trmsim_wsn.trm.powertrust
Class PowerTrust_Sensor

java.lang.Object
  es.ants.felixgm.trmsim_wsn.network.Sensor
      es.ants.felixgm.trmsim_wsn.trm.powertrust.PowerTrust_Sensor

All Implemented Interfaces:

java.lang.Comparable<PowerTrust_Sensor>, java.lang.Runnable

public class PowerTrust_Sensor
extends Sensor
implements java.lang.Comparable<PowerTrust_Sensor>

This class models a Sensor implementing PowerTrust

Since:

0.3

Version:

0.3

Author:

Félix Gómez Mármol, Gregorio Martínez Pérez

Field Summary

protected static int	_numSensors Number of sensors composing the network this sensor belongs to
protected double	globalReputationScore Score v_i
protected boolean	isPowerNode Indicates if this sensor is a power node (true) or not (false)
protected double[]	mostRecentFeedbackScoreVector Vector s_i
protected double[]	normalizedLocalTrustVector Vector r_i
protected java.util.Collection<Transaction>	transactions Collection of Transactions this sensor has had

Fields inherited from class es.ants.felixgm.trmsim_wsn.network.Sensor

_maxDistance, activeState, collusion, dynamic, id, idCount, links, numRequests, numRequestsThreshold, numRequestsTimer, outcome, requiredService, runningSimulation, servicesGoodness, sleepTimer, sleepTimerAux, transmittedDistance, trmmodelWSN, xPosition, yPosition

Constructor Summary

PowerTrust_Sensor()
This constructor creates a new Sensor implementing PowerTrust

PowerTrust_Sensor(int id, double x, double y)
This constructor creates a new Sensor implementing PowerTrust

Method Summary

void	addNewTransaction(PowerTrust_Sensor client, PowerTrust_Sensor server, Outcome outcome) This method adds a new Transaction to the collection of transactions of this sensor
int	compareTo(PowerTrust_Sensor comparedSensor) This method compares two PowerTrust sensors according to their global reputation scores
double	computeGlobalReputation() This method computes the global retupation of this node according to algorithm 3 of PowerTrust, i.e., v_i = (1-alpha)*sum(v_j*r_{ji})+alpha/m if this sensor is a power node and v_i = (1-alpha)*sum(v_j*r_{ji}), otherwise
double	get_globalReputationScore() Returns the current global reputation score v_i^t
Outcome	get_outcome() This method returns the last outcome of a performed transaction and, additionally, dynamically selects the new set of m power nodes
double	getNormalizedLocalTrustScore(PowerTrust_Sensor server) This method computes the normalized local trust score r_{ij}\in[0,1]
static int	getNumSensors() Returns the number of sensors composing the network this sensor belongs to
boolean	isPowerNode() Indicates if this sensor is a power node (true) or not (false)
void	reset() This method resets a Sensor to its initial state
static void	setNumSensors(int numSensors) Sets the number of sensors composing the network this sensor belongs to
void	setPowerNode(boolean isPowerNode) Sets this senor as a power node or not

Methods inherited from class es.ants.felixgm.trmsim_wsn.network.Sensor

addLink, addService, addTransmittedDistance, cancelAllTimers, distance, distanceInHops, equals, findSensors, get_goodness, get_numServices, get_requiredService, get_services, get_transmittedDistance, get_TRModel_WSN, getNeighbors, getService, getX, getY, id, isActive, isNeighbor, isRunningSimulation, offersService, offersService, removeAllNeighbors, removeLink, removeService, resetId, run, serve, set_goodness, set_requiredService, set_TRModel_WSN, setActiveState, setCollusion, setDynamic, setMaxDistance, setRunningSimulation, toString

Methods inherited from class java.lang.Object

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

Field Detail

_numSensors

protected static int _numSensors

Number of sensors composing the network this sensor belongs to

globalReputationScore

protected double globalReputationScore

Score v_i

normalizedLocalTrustVector

protected double[] normalizedLocalTrustVector

Vector r_i

mostRecentFeedbackScoreVector

protected double[] mostRecentFeedbackScoreVector

Vector s_i

transactions

protected java.util.Collection<Transaction> transactions

Collection of Transactions this sensor has had

isPowerNode

protected boolean isPowerNode

Indicates if this sensor is a power node (true) or not (false)

Constructor Detail

PowerTrust_Sensor

public PowerTrust_Sensor()

This constructor creates a new Sensor implementing PowerTrust

PowerTrust_Sensor

public PowerTrust_Sensor(int id,
                         double x,
                         double y)

This constructor creates a new Sensor implementing PowerTrust

Parameters:

id - Identifier of the new sensor

x - X coordinate of the new sensor

y - Y coordinate of the new sensor

Method Detail

reset

public void reset()

Description copied from class: Sensor

This method resets a Sensor to its initial state

Specified by:

reset in class Sensor

getNormalizedLocalTrustScore

public double getNormalizedLocalTrustScore(PowerTrust_Sensor server)

This method computes the normalized local trust score r_{ij}\in[0,1]

Parameters:

server - Server j

Returns:

r_{ij}

computeGlobalReputation

public double computeGlobalReputation()

This method computes the global retupation of this node according to algorithm 3 of PowerTrust, i.e., v_i = (1-alpha)*sum(v_j*r_{ji})+alpha/m if this sensor is a power node and v_i = (1-alpha)*sum(v_j*r_{ji}), otherwise

Returns:

The global reputation of this node after computing it

addNewTransaction

public void addNewTransaction(PowerTrust_Sensor client,
                              PowerTrust_Sensor server,
                              Outcome outcome)

This method adds a new Transaction to the collection of transactions of this sensor

Parameters:

client - The client who requested the service

server - The server who provided the service

outcome - Outcome of the trnsaction to be added

get_outcome

public Outcome get_outcome()

This method returns the last outcome of a performed transaction and, additionally, dynamically selects the new set of m power nodes

Overrides:

get_outcome in class Sensor

Returns:

The last outcome of a performed transaction

compareTo

public int compareTo(PowerTrust_Sensor comparedSensor)

This method compares two PowerTrust sensors according to their global reputation scores

Specified by:

compareTo in interface java.lang.Comparable<PowerTrust_Sensor>

Parameters:

comparedSensor - Sensor to be compared with this sensor

Returns:

1, 0 or -1 if this sensor's global reputation is greater than, equal to, or less than comparedSensor's global reputation

setNumSensors

public static void setNumSensors(int numSensors)

Sets the number of sensors composing the network this sensor belongs to

Parameters:

numSensors - The number of sensors composing the network this sensor belongs to

setPowerNode

public void setPowerNode(boolean isPowerNode)

Sets this senor as a power node or not

Parameters:

isPowerNode - true if this sensor is to be a power node, false otherwise

isPowerNode

public boolean isPowerNode()

Indicates if this sensor is a power node (true) or not (false)

Returns:

true if this sensor is a power node, false otherwise

getNumSensors

public static int getNumSensors()

Returns the number of sensors composing the network this sensor belongs to

Returns:

The number of sensors composing the network this sensor belongs to

get_globalReputationScore

public double get_globalReputationScore()

Returns the current global reputation score v_i^t

Returns:

The current global reputation score v_i^t