Package org.cloudbus.cloudsim.network.topologies

Class BriteNetworkTopology

java.lang.Object

org.cloudbus.cloudsim.network.topologies.BriteNetworkTopology

All Implemented Interfaces:

NetworkTopology

public final class BriteNetworkTopology
extends Object
implements NetworkTopology

Implements a network layer by reading the topology from a file in the BRITE format, the Boston university Representative Internet Topology gEnerator, and generates a topological network from it. Information of this network is used to simulate latency in network traffic of CloudSim.

The topology file may contain more nodes than the number of entities in the simulation. It allows users to increase the scale of the simulation without changing the topology file. Nevertheless, each CloudSim entity must be mapped to one (and only one) BRITE node to allow proper work of the network simulation. Each BRITE node can be mapped to only one entity at a time.

Since:

CloudSim Toolkit 1.0

Author:

Rodrigo N. Calheiros, Anton Beloglazov

See Also:

• getInstance(String)
• Brite Oficial Website (shut down)
• Web archieve of Brite Oficial Website

Field Summary

Fields inherited from interface org.cloudbus.cloudsim.network.topologies.NetworkTopology

NULL

Constructor Summary

Constructors

Constructor	Description
BriteNetworkTopology()	Instantiates an empty Network Topology.
BriteNetworkTopology(String filePath)	Instantiates a Network Topology if a given file exists and can be successfully parsed.

Method Summary

Modifier and Type	Method	Description
void	addLink(SimEntity src, SimEntity dest, double bandwidth, double latency)	Adds a new link in the network topology.
double[][]	getBwMatrix()	Gets a copy of the matrix containing the bandwidth (in Megabits/s) between every pair of SimEntitys in the network.
double	getDelay(SimEntity src, SimEntity dest)	Calculates the delay (in seconds) between two nodes.
static BriteNetworkTopology	getInstance(String fileName)	Instantiates a Network Topology from a file inside the application's resource directory.
TopologicalGraph	getTopologicalGraph()	Gets the Topological Graph of the network.
boolean	isNetworkEnabled()	Checks if the network simulation is working.
void	mapNode(SimEntity entity, int briteID)	Maps a SimEntity to a BRITE node in the network topology.
void	removeLink(SimEntity src, SimEntity dest)
void	unmapNode(SimEntity entity)	Un-maps a previously mapped SimEntity to a BRITE node in the network topology.

Methods inherited from class java.lang.Object

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

Constructor Details

BriteNetworkTopology

public BriteNetworkTopology()

Instantiates an empty Network Topology.

See Also:

• BriteNetworkTopology(String)
• BriteNetworkTopology(InputStreamReader)
• getInstance(String)

BriteNetworkTopology

public BriteNetworkTopology(String filePath)

Instantiates a Network Topology if a given file exists and can be successfully parsed. File is written in the BRITE format and contains topological information on simulation entities.

Parameters:

filePath - the path of the BRITE file

See Also:

• BriteNetworkTopology()
• BriteNetworkTopology(InputStreamReader)
• getInstance(String)

Method Details

getInstance

public static BriteNetworkTopology getInstance(String fileName)

Instantiates a Network Topology from a file inside the application's resource directory.

Parameters:

fileName - the relative name of the BRITE file

Returns:

the BriteNetworkTopology instance.

addLink

public void addLink(SimEntity src,
 SimEntity dest,
 double bandwidth,
 double latency)

Description copied from interface: NetworkTopology

Adds a new link in the network topology. The SimEntitys that represent the source and destination of the link will be mapped to BRITE entities.

Specified by:

addLink in interface NetworkTopology

Parameters:

src - SimEntity that represents the link's source node

dest - SimEntity that represents the link's destination node

bandwidth - link's bandwidth (in Megabits/s)

latency - link's latency (in seconds)

removeLink

public void removeLink(SimEntity src,
 SimEntity dest)

Specified by:

removeLink in interface NetworkTopology

mapNode

public void mapNode(SimEntity entity,
 int briteID)

Maps a SimEntity to a BRITE node in the network topology.

Parameters:

entity - SimEntity being mapped

briteID - ID of the BRITE node that corresponds to the CloudSim

unmapNode

public void unmapNode(SimEntity entity)

Un-maps a previously mapped SimEntity to a BRITE node in the network topology.

Parameters:

entity - SimEntity being unmapped

getDelay

public double getDelay(SimEntity src,
 SimEntity dest)

Description copied from interface: NetworkTopology

Calculates the delay (in seconds) between two nodes.

Specified by:

getDelay in interface NetworkTopology

Parameters:

src - SimEntity that represents the link's source node

dest - SimEntity that represents the link's destination node

Returns:

communication delay (in seconds) between the two nodes

isNetworkEnabled

public boolean isNetworkEnabled()

Checks if the network simulation is working. If there were some problem during creation of network (e.g., during parsing of BRITE file) that does not allow a proper simulation of the network, this method returns false.

Returns:

true if network simulation is working, $false otherwise

getTopologicalGraph

public TopologicalGraph getTopologicalGraph()

Gets the Topological Graph of the network.

Returns:

getBwMatrix

public double[][] getBwMatrix()

Gets a copy of the matrix containing the bandwidth (in Megabits/s) between every pair of SimEntitys in the network.