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CloudSim Plus: A modern, highly extensible and easier-to-use Java 8+ Framework for Modeling and Simulation of Cloud Computing Infrastructures and Services
/*
* ** Network and Service Differentiation Extensions to CloudSim 3.0 **
*
* Gokul Poduval & Chen-Khong Tham
* Computer Communication Networks (CCN) Lab
* Dept of Electrical & Computer Engineering
* National University of Singapore
* August 2004
*
* Licence: GPL - http://www.gnu.org/copyleft/gpl.html
* Copyright (c) 2004, The University of Melbourne, Australia and National
* University of Singapore
* InfoPacket.java - Implementation of a Information Packet.
*
*/
package org.cloudbus.cloudsim.network;
import org.cloudbus.cloudsim.core.CloudSimTag;
import org.cloudbus.cloudsim.core.SimEntity;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Represents a ping (ICMP protocol) packet that can be used to gather information from the network layer.
* An IcmpPacket traverses the network topology similar to a {@link HostPacket},
* but it collects information like bandwidths, and Round Trip Time etc.
*
*
* You can set all the parameters to an IcmpPacket that can be applied to a
* HostPacket. So if you want to find out the kind of information that a
* particular type of HostPacket is experiencing, set the size and network class
* of an IcmpPacket to the same as the HostPacket, and send it to the same
* destination from the same source.
*
*
* @author Gokul Poduval
* @author Chen-Khong Tham, National University of Singapore
* @since CloudSim Toolkit 1.0
*/
public class IcmpPacket implements NetworkPacket {
/**
* A default value to indicate {@link #baudRate} was not set yet.
*/
private static final int UNSET_BAUD_RATE = -1;
/* @see #getTag() */
private CloudSimTag tag;
/**
* The packet name.
*/
private final String name;
/** @see #getSize() */
private long size;
/**
* The id of the packet.
*/
private final int packetId;
/**
* The original sender.
*/
private SimEntity source;
/**
* The destination.
*/
private SimEntity destination;
/** @see #getLastHop() */
private SimEntity lastHop;
/** @see #getNetServiceLevel() */
private int netServiceLevel;
/** @see #getBaudRate() */
private double baudRate;
/**
* The list with entities where the packet
* traverses, such as Routers or Datacenters.
*/
private final List entities;
/** @see #getDetailEntryTimes() */
private final List entryTimes;
/** @see #getDetailExitTimes() */
private final List exitTimes;
/**
* The baud rate (in bits/s) of each output link of entities where the packet traverses.
*/
private final List baudRateList;
private final DecimalFormat num;
/** @see #getSendTime() */
private double sendTime;
/** @see #getReceiveTime() */
private double receiveTime;
/**
* Creates an ICMP packet.
*
* @param name Name of this packet
* @param packetID the ID of this packet
* @param size size of the packet
* @param source the entity that sends out this packet
* @param destination the entity to which this packet is destined
* @param netServiceLevel the class of traffic this packet belongs to
*/
public IcmpPacket(
final String name, final int packetID, final long size,
final SimEntity source, final SimEntity destination, final int netServiceLevel)
{
this.name = name;
this.packetId = packetID;
this.source = source;
this.destination = destination;
this.size = size;
this.netServiceLevel = netServiceLevel;
this.entities = new ArrayList<>();
this.entryTimes = new ArrayList<>();
this.exitTimes = new ArrayList<>();
this.baudRateList = new ArrayList<>();
this.lastHop = this.source;
this.tag = CloudSimTag.ICMP_PKT_SUBMIT;
this.baudRate = UNSET_BAUD_RATE;
this.num = new DecimalFormat("#0.000#");
}
/**
* Gets the ID of this packet
* @return
*/
public int getId() {
return packetId;
}
/**
* Gets human-readable information of this packet.
*
* @return description of this packet
*/
@Override
public String toString() {
if (name == null) {
return "Empty IcmpPacket that contains no ping information.";
}
final int SIZE = 1000; // number of chars
final StringBuilder sb = new StringBuilder(SIZE);
sb.append("Ping information for ").append(name)
.append("%nEntity Name\tEntry Time\tExit Time\t Bandwidth%n".formatted())
.append("----------------------------------------------------------")
.append(System.lineSeparator());
final String tab = " "; // 4 spaces
for (int i = 0; i < entities.size(); i++) {
final long resID = entities.get(i).getId();
final String entry = getData(entryTimes, i);
final String exit = getData(exitTimes, i);
final String bandwidth = getData(baudRateList, i);
sb.append("Entity ").append(resID).append("\t\t")
.append("%s%s%s%s%s%s%s%n".formatted(entry, tab, tab, exit, tab, tab, bandwidth));
}
sb.append(System.lineSeparator())
.append("Round Trip Time : ")
.append(num.format(getTotalResponseTime()))
.append(" seconds%nNumber of Hops : ".formatted())
.append(getNumberOfHops())
.append(System.lineSeparator())
.append("Bottleneck Bandwidth : ")
.append(baudRate).append(" bits/s");
return sb.toString();
}
/**
* Gets the data of a given index in a list.
*
* @param dataList a list containing the data
* @param index the location in the list
* @return the data from a given index
*/
private String getData(final List dataList, final int index) {
try {
final double id = dataList.get(index);
return num.format(id);
} catch (final Exception e) {
return " N/A";
}
}
@Override
public long getSize() {
return size;
}
/**
* Sets the size of the packet.
*
* @param size the size to set (in bytes)
* @return true if a positive value was given, false otherwise
*/
public boolean setSize(final long size) {
if (size < 0) {
return false;
}
this.size = size;
return true;
}
@Override
public SimEntity getSource() {
return source;
}
@Override
public void setSource(final SimEntity source) {
this.source = source;
}
@Override
public SimEntity getDestination() {
return destination;
}
@Override
public void setDestination(final SimEntity destination) {
this.destination = destination;
}
@Override
public double getSendTime() {
return this.sendTime;
}
@Override
public void setSendTime(final double time) {
this.sendTime = time;
}
@Override
public double getReceiveTime() {
return this.receiveTime;
}
@Override
public void setReceiveTime(final double time) {
this.receiveTime = time;
}
/**
* Gets the number of hops that the packet has traversed. Since the
* packet takes a round trip, the same router may have been traversed twice.
*
* @return
*/
public int getNumberOfHops() {
final int PAIR = 2;
return ((entities.size() - PAIR) + 1) / PAIR;
}
/**
* Gets the total time that the packet has spent in the network (in seconds).
* This is basically the Round-Trip Time (RTT).
* Dividing this by half should be the approximate latency.
* RTT is taken as the "final entry time" - "first exit time".
*
* @return total round-trip time (in seconds)
*/
public double getTotalResponseTime() {
try {
final double startTime = exitTimes.stream().findFirst().orElse(0.0);
final double receiveTime = entryTimes.stream().findFirst().orElse(0.0);
return receiveTime - startTime;
} catch (Exception e) {
return 0;
}
}
/**
* Gets the bottleneck bandwidth (baud rate) between the source and the destination.
*
* @return the bottleneck bandwidth (in bits/s)
*/
public double getBaudRate() {
return baudRate;
}
/**
* Add an entity where the IcmpPacket traverses. This method should be
* called by network entities that count as hops, for instance Routers or
* CloudResources. It should not be called by links etc.
*
* @param entity the id of the hop that this IcmpPacket is traversing
*/
public void addHop(final SimEntity entity) {
entities.add(entity);
}
/**
* Register the time the packet arrives at an entity such as a Router or
* CloudResource. This method should be called by routers and other entities
* when the IcmpPacket reaches them along with the current simulation time.
*
* @param time current simulation time, use
* {@link org.cloudbus.cloudsim.core.CloudSim#clock()} to obtain this
*/
public void addEntryTime(final double time) {
entryTimes.add(Math.min(time, 0));
}
/**
* Register the time the packet leaves an entity such as a Router or
* CloudResource. This method should be called by routers and other entities
* when the IcmpPacket is leaving them. It should also supply the current
* simulation time.
*
* @param time current simulation time, use
* {@link org.cloudbus.cloudsim.core.CloudSim#clock()} to obtain this
*/
public void addExitTime(final double time) {
exitTimes.add(Math.min(time, 0));
}
/**
* Register the baud rate (in bits/s) of the output link where the current entity that
* holds the IcmpPacket will send it next. Every entity that the IcmpPacket
* traverses should add the baud rate of the link on which this packet will
* be sent out next.
*
* @param baudRate the entity's baud rate in bits/s
*/
public void addBaudRate(final double baudRate) {
baudRateList.add(baudRate);
if (this.baudRate <= UNSET_BAUD_RATE || this.baudRate > baudRate) {
this.baudRate = baudRate;
}
}
/**
* Gets a read-only list of all the bandwidths (in bits/s) that this packet has traversed.
*
* @return
*/
public List getDetailBaudRate() {
return Collections.unmodifiableList(baudRateList);
}
/**
* Gets a read-only list of all entities that this packet has traversed,
* that defines the hops it has made.
*
* @return
*/
public List getHopsList() {
return Collections.unmodifiableList(entities);
}
/**
* Gets a read-only list containing the time (in seconds) the packet arrived at every entity it has traversed.
*
* @return
*/
public List getDetailEntryTimes() {
return Collections.unmodifiableList(entryTimes);
}
/**
* Gets a read-only list of all exit times (in seconds) from all entities that the packet has
* traversed.
*
* @return
*/
public List getDetailExitTimes() {
return Collections.unmodifiableList(exitTimes);
}
/**
* Gets the entity that was the last hop where this packet has traversed.
*
* @return
*/
public SimEntity getLastHop() {
return lastHop;
}
/**
* Sets the entity that was the last hop where this packet has traversed.
*
* @param entity the entity to set as the last hop
*/
public void setLastHop(final SimEntity entity) {
this.lastHop = entity;
}
/**
* Gets the network service level of this packet
*
* @return the network service level
*/
public int getNetServiceLevel() {
return netServiceLevel;
}
/**
* Sets the network service type of this packet.
*
* By default, the service type is 0 (zero). It is depends on the packet scheduler to determine
* the priority of this service level.
*
* @param netServiceLevel the service level to set
*/
public void setNetServiceLevel(final int netServiceLevel) {
this.netServiceLevel = netServiceLevel;
}
/**
* Gets the packet direction that indicates if it is going or returning.
* The direction can be {@link CloudSimTag#ICMP_PKT_SUBMIT}
* or {@link CloudSimTag#ICMP_PKT_RETURN}.
*
* @return
*/
public CloudSimTag getTag() {
return tag;
}
/**
* Sets the packet direction that indicates if it is going or returning.
* The direction can be {@link CloudSimTag#ICMP_PKT_SUBMIT}
* or {@link CloudSimTag#ICMP_PKT_RETURN}.
*
* @param tag the direction to set
*/
public void setTag(final CloudSimTag tag) {
if (tag.between(CloudSimTag.ICMP_PKT_SUBMIT, CloudSimTag.ICMP_PKT_RETURN)) {
this.tag = tag;
}
else {
final var fmt = "Tag must be between %s and %s";
final var msg = fmt.formatted(CloudSimTag.ICMP_PKT_SUBMIT, CloudSimTag.ICMP_PKT_RETURN);
throw new IllegalArgumentException(msg);
}
}
}
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