vbsStatistics

Class StatisticsFlow

java.lang.Object

vbsStatistics.StatisticsFlow

public class StatisticsFlow
extends java.lang.Object

The class StatisticsFlow represents a network flow used for calculating statistics, which is based on 5-tuple:
- local IP address
- remote IP address
- local transport layer port
- remote transport layer port
- transport layer protocol

Author:

Tomasz Bujlow (tbu@es.aau.dk)

Field Summary

Fields

Modifier and Type	Field and Description
long	flow_id Identifier of the flow.
int	local_port Local transport layer port of the flow.
java.util.ArrayList<StatisticsPacket>	packets List of packets assigned to the flow.
java.lang.String	protocol_name Transport layer protocol name of the flow.
int	remote_port Remote transport layer port of the flow.
java.lang.String	traffic_class Type of the traffic, like web, multimedia, audio, video, etc.

Constructor Summary

Constructors

Constructor and Description
StatisticsFlow() Constructs the object.

Method Summary

Methods

Modifier and Type	Method and Description
private StatisticsStatistics	calculateStatistics(StatisticsStatistics stat) Calculates statistics from the flow and stored them in the stat object.
void	commit(java.io.PrintWriter writer) Writes statistics calculated from the flow to an external file.
private static java.util.ArrayList<java.lang.Long>	GetValuesGreaterThan(java.util.ArrayList<java.lang.Long> values, double limit, boolean orEqualTo) Gets values greater than the limit.
private static java.util.ArrayList<java.lang.Long>	GetValuesLessThan(java.util.ArrayList<java.lang.Long> values, double limit, boolean orEqualTo) Gets values smaller than the limit.
private static double	Median(java.util.ArrayList<java.lang.Long> values) Returns median from the list of values.
private static double[]	Quartiles(java.util.ArrayList<java.lang.Long> values) Calculates quartiles of values specified on the list.

Methods inherited from class java.lang.Object

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

Field Detail

flow_id

public long flow_id

Identifier of the flow.

local_port

public int local_port

Local transport layer port of the flow.

remote_port

public int remote_port

Remote transport layer port of the flow.

protocol_name

public java.lang.String protocol_name

Transport layer protocol name of the flow.

traffic_class

public java.lang.String traffic_class

Type of the traffic, like web, multimedia, audio, video, etc.

packets

public java.util.ArrayList<StatisticsPacket> packets

List of packets assigned to the flow.

Constructor Detail

StatisticsFlow

public StatisticsFlow()

Constructs the object.

Method Detail

commit

public void commit(java.io.PrintWriter writer)

Writes statistics calculated from the flow to an external file. At first we create a new StatisticsStatistics object which is the writer responsible for writing statistics to the file. Then, we calculate the statistics by the calculateStatistics method. Lastly, we write these statistics to the file by the commit method of the StatisticsStatistics object.

Parameters:

writer - writer responsible for writing a text to a text file

calculateStatistics

private StatisticsStatistics calculateStatistics(StatisticsStatistics stat)
                                          throws HugePacketException

Calculates statistics from the flow and stored them in the stat object.

Parameters:

stat - object to store the calculated statistics

Returns:

object with stored calculated statistics

Throws:

HugePacketException - if any packet belonging to the flow is bigger than 1500 B

Quartiles

private static double[] Quartiles(java.util.ArrayList<java.lang.Long> values)

Calculates quartiles of values specified on the list.

Parameters:

values - list containing the values from which the quartiles are calculated

Returns:

an array of quartiles: lower, median, and upper

GetValuesGreaterThan

private static java.util.ArrayList<java.lang.Long> GetValuesGreaterThan(java.util.ArrayList<java.lang.Long> values,
                                                       double limit,
                                                       boolean orEqualTo)

Gets values greater than the limit.

Parameters:

values - list of values used for selection

limit - values greater than this limit will be returned

orEqualTo - if true, values equal to the limit will be returned as well

Returns:

values greater than the limit

GetValuesLessThan

private static java.util.ArrayList<java.lang.Long> GetValuesLessThan(java.util.ArrayList<java.lang.Long> values,
                                                    double limit,
                                                    boolean orEqualTo)

Gets values smaller than the limit.

Parameters:

values - list of values used for selection

limit - values smaller than this limit will be returned

orEqualTo - if true, values equal to the limit will be returned as well

Returns:

values smaller than the limit

Median

private static double Median(java.util.ArrayList<java.lang.Long> values)

Returns median from the list of values.

Parameters:

values - the list of values

Returns:

median from the list of values