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Giacomo Bertolazzi
2025-01-15 16:59:52 +01:00
parent 695add3440
commit ad160877de
8 changed files with 662 additions and 0 deletions
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11
SimulatoreBCNN/SimulatoreBCNN.iml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

149
SimulatoreBCNN/src/Sim.java Normal file
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import SimUtils.*;
import SimUtils.Queue;
import java.util.*;
class Sim {
// Class Sim variables
public static double Clock, MeanInterArrivalTime, MeanServiceTime, SIGMA, LastEventTime,
TotalBusy, MaxQueueLength, SumResponseTime;
public static long NumberOfCustomers, QueueLength, NumberInService,
TotalCustomers, NumberOfDepartures, LongService;
public final static int arrival = 1;
public final static int departure = 2;
public static EventList FutureEventList;
public static Queue Customers;
public static Random stream;
public static void main(String argv[]) {
MeanInterArrivalTime = 4.5; MeanServiceTime = 3.2;
SIGMA = 0.6; TotalCustomers = 1000;
long seed = Long.parseLong(argv[0]);
stream = new Random(seed); // initialize rng stream
FutureEventList = new EventList();
Customers = new Queue();
Initialization();
// Loop until first "TotalCustomers" have departed
while(NumberOfDepartures < TotalCustomers ) {
Event evt = (Event)FutureEventList.getMin(); // get imminent event
FutureEventList.dequeue(); // be rid of it
Clock = evt.get_time(); // advance simulation time
if( evt.get_type() == arrival ) ProcessArrival(evt);
else ProcessDeparture(evt);
}
ReportGeneration();
}
// seed the event list with TotalCustomers arrivals
public static void Initialization() {
Clock = 0.0;
QueueLength = 0;
NumberInService = 0;
LastEventTime = 0.0;
TotalBusy = 0 ;
MaxQueueLength = 0;
SumResponseTime = 0;
NumberOfDepartures = 0;
LongService = 0;
// create first arrival event
Event evt = new Event(arrival, exponential( stream, MeanInterArrivalTime));
FutureEventList.enqueue( evt );
}
public static void ProcessArrival(Event evt) {
Customers.enqueue(evt);
QueueLength++;
// if the server is idle, fetch the event, do statistics
// and put into service
if( NumberInService == 0) ScheduleDeparture();
else TotalBusy += (Clock - LastEventTime); // server is busy
// adjust max queue length statistics
if (MaxQueueLength < QueueLength) MaxQueueLength = QueueLength;
// schedule the next arrival
Event next_arrival = new Event(arrival, Clock+exponential(stream, MeanInterArrivalTime));
FutureEventList.enqueue( next_arrival );
LastEventTime = Clock;
}
public static void ScheduleDeparture() {
double ServiceTime;
// get the job at the head of the queue
while (( ServiceTime = normal(stream, MeanServiceTime, SIGMA)) < 0 );
Event depart = new Event(departure,Clock+ServiceTime);
FutureEventList.enqueue( depart );
NumberInService = 1;
QueueLength--;
}
public static void ProcessDeparture(Event e) {
// get the customer description
Event finished = (Event) Customers.dequeue();
// if there are customers in the queue then schedule
// the departure of the next one
if( QueueLength > 0 ) ScheduleDeparture();
else NumberInService = 0;
// measure the response time and add to the sum
double response = (Clock - finished.get_time());
SumResponseTime += response;
if( response > 4.0 ) LongService++; // record long service
TotalBusy += (Clock - LastEventTime );
NumberOfDepartures++;
LastEventTime = Clock;
}
public static void ReportGeneration() {
double RHO = TotalBusy/Clock;
double AVGR = SumResponseTime/TotalCustomers;
double PC4 = ((double)LongService)/TotalCustomers;
System.out.println( "SINGLE SERVER QUEUE SIMULATION - GROCERY STORE CHECKOUT COUNTER ");
System.out.println( "\tMEAN INTERARRIVAL TIME "
+ MeanInterArrivalTime );
System.out.println( "\tMEAN SERVICE TIME "
+ MeanServiceTime );
System.out.println( "\tSTANDARD DEVIATION OF SERVICE TIMES " + SIGMA );
System.out.println( "\tNUMBER OF CUSTOMERS SERVED " + TotalCustomers );
System.out.println();
System.out.println( "\tSERVER UTILIZATION " + RHO );
System.out.println( "\tMAXIMUM LINE LENGTH " + MaxQueueLength );
System.out.println( "\tAVERAGE RESPONSE TIME " + AVGR + " MINUTES" );
System.out.println( "\tPROPORTION WHO SPEND FOUR ");
System.out.println( "\t MINUTES OR MORE IN SYSTEM " + PC4 );
System.out.println( "\tSIMULATION RUNLENGTH " + Clock + " MINUTES" );
System.out.println( "\tNUMBER OF DEPARTURES " + TotalCustomers );
}
public static double exponential(Random rng, double mean) {
return -mean*Math.log( rng.nextDouble() );
}
public static double SaveNormal;
public static int NumNormals = 0;
public static final double PI = 3.1415927 ;
public static double normal(Random rng, double mean, double sigma) {
double ReturnNormal;
// should we generate two normals?
if(NumNormals == 0 ) {
double r1 = rng.nextDouble();
double r2 = rng.nextDouble();
ReturnNormal = Math.sqrt(-2*Math.log(r1))*Math.cos(2*PI*r2);
SaveNormal = Math.sqrt(-2*Math.log(r1))*Math.sin(2*PI*r2);
NumNormals = 1;
} else {
NumNormals = 0;
ReturnNormal = SaveNormal;
}
return ReturnNormal*sigma + mean ;
}
}

21
SimulatoreBCNN/src/SimUtils/Event.java Normal file
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package SimUtils;
public class Event implements Comparable {
public Event(int a_type, double a_time) { _type = a_type; time = a_time; }
public double time;
private int _type;
public int get_type() { return _type; }
public double get_time() { return time; }
public Event leftlink, rightlink, uplink;
public int compareTo(Object _cmpEvent ) {
double _cmp_time = ((Event) _cmpEvent).get_time() ;
if( this.time < _cmp_time) return -1;
if( this.time == _cmp_time) return 0;
return 1;
}
}

195
SimulatoreBCNN/src/SimUtils/EventList.java Normal file
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package SimUtils;
// EventList is implemented as a splay tree
// v1. class Event knows this and has fields
// leftlink, rightlink, uplink
public class EventList {
Event root;
Event update_p;
Event left,right,next,temp,farleft,farfarleft;
double ntime;
boolean update_code;
int size = 0;
Object owner;
public EventList(){ }
public String toString(){
return "EventList ";
}
public boolean isEmpty(){
return (this.root == null);
}
public void enqueue(Event n){
size++;
n.uplink = null;
next = this.root;
this.root = n;
if (next == null){
n.leftlink = null;
n.rightlink = null;
}
else{
mainblock: {
ntime = n.time;
left = n;
right = n;
if (next.time > ntime){
//2222222222222222222222222
do{
temp = next.leftlink;
if (temp == null){
right.leftlink = next;
next.uplink = right;
left.rightlink = null;
break mainblock;
}
if (temp.time <= ntime){
right.leftlink = next;
next.uplink = right;
right = next;
next = temp;
break;
}
next.leftlink = temp.rightlink;
if (temp.rightlink != null)
temp.rightlink.uplink = next;
right.leftlink = temp;
temp.uplink = right;
temp.rightlink = next;
next.uplink = temp;
right = temp;
next = temp.leftlink;
if (next == null){
left.rightlink = null;
break mainblock;
}
}while (next.time > ntime);
}
forblock:
for( ; ; ){
//111111111111111111111111111
do{
temp = next.rightlink;
if (temp == null){
left.rightlink = next;
next.uplink = left;
right.leftlink = null;
break forblock;
}
if (temp.time > ntime){
left.rightlink = next;
next.uplink = left;
left = next;
next = temp;
break;
}
next.rightlink = temp.leftlink;
if (temp.leftlink!=null)
temp.leftlink.uplink = next;
left.rightlink = temp;
temp.uplink = left;
temp.leftlink = next;
next.uplink = temp;
left = temp;
next = temp.rightlink;
if (next == null){
right.leftlink = null;
break forblock;
}
}while (next.time <= ntime);
//2222222222222222222222222222
do{
temp = next.leftlink;
if (temp == null){
right.leftlink = next;
next.uplink = right;
left.rightlink = null;
break forblock;
}
if (temp.time <= ntime){
right.leftlink = next;
next.uplink = right;
right = next;
next = temp;
break;
}
next.leftlink = temp.rightlink;
if (temp.rightlink != null)
temp.rightlink.uplink = next;
right.leftlink = temp;
temp.uplink = right;
temp.rightlink = next;
next.uplink = temp;
right = temp;
next = temp.leftlink;
if (next == null){
left.rightlink = null;
break forblock;
}
}while (next.time > ntime);
}
}
//99999999999999999999999999999
temp = n.leftlink;
n.leftlink = n.rightlink;
n.rightlink = temp;
}
}
public Event getMin(){
//assumed that the tree is not empty
next = this.root;
left = next.leftlink;
if (left ==null){
update_code = true;
return next;
}
else{
for ( ; ; ){
farleft = left.leftlink;
if (farleft == null){
update_code = false;
update_p = next;
return left;
}
farfarleft = farleft.leftlink;
if (farfarleft==null){
update_code = false;
update_p = left;
return farleft;
}
next.leftlink = farleft;
farleft.uplink = next;
left.leftlink = farleft.rightlink;
if (farleft.rightlink!=null)
farleft.rightlink.uplink = left;
farleft.rightlink = left;
left.uplink = farleft;
next = farleft;
left = farfarleft;
}
}
}
public void dequeue(){
size--;
//assumed that getMin has been the last splay tree operation invoked. Removes that element.
if (update_code){
next = null; //remove pointer to the returned Event
root = root.rightlink;
if (root!=null)
root.uplink = null;
}
else{
left = farleft = null; //remove pointers to the returned event
if (update_p.leftlink.rightlink!=null)
update_p.leftlink.rightlink.uplink = update_p;
update_p.leftlink = update_p.leftlink.rightlink;
}
}
}

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SimulatoreBCNN/src/SimUtils/Queue.java Normal file
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package SimUtils;
/**
This class provides a fairly efficient implementation of a FIFO
queue. We use an array to implement the queue which is
automatically increased in size when necessary. Note that the queue
is never shrunk in the current implementation.
@author Mark Astley
@version $Revision: 1.5 $ ($Date: 1998/09/07 23:00:37 $)
*/
// public class Queue implements Cloneable, Serializable {
public class Queue {
/**
This constant sets the initial size of a queue when the default
constructor is invoked to create a queue. Users requiring a
different initial size may invoke the appropriate constructor
below.
*/
public static final int INITIAL_SIZE = 10;
/**
This array holds the queue. We use a dynamically growing circular
array to represent the queue. Queue size is doubled when
necessary which should make for a rather efficient implementation.
*/
Object[] theQ;
/**
These two fields hold indices to the first and last element of the
queue respectively. Technically, <em>back</em> points to the
first open spot in the queue rather than the last element.
*/
int front;
int back;
/**
Default constructor for the <em>Queue</em> class.
*/
public Queue() {
theQ = new Object[INITIAL_SIZE];
front=back=0;
}
/**
Alternative constructor for the <em>Queue</em> class which allows
the specification of the initial size of the queue.
@param <b>initialSize</b> The initial size of the new <em>Queue</em>.
*/
public Queue(int initialSize) {
theQ = new Object[initialSize];
front=back=0;
}
/**
This private method is used to double the size of the queue when
more space is required (as a result of calling enqueue). Note
that because the implementation is in terms of a circular array,
we have to be careful when copying elements from the old array to
the new array.
*/
synchronized private void grow() {
Object[] newQ = new Object[2 * theQ.length];
if (back >= front)
System.arraycopy(theQ, front, newQ, front, back - front + 1);
else {
System.arraycopy(theQ, front, newQ, front, theQ.length - front);
System.arraycopy(theQ, 0, newQ, theQ.length, back);
back = front + theQ.length - 1;
}
theQ = newQ;
}
/**
Determine if the queue is empty.
@return <b>true</b> if the queue contains no elements,
<b>false</b> otherwise.
*/
synchronized public boolean empty() {
return (front == back);
}
/**
Add an object to the end of the queue.
@param <b>q</b> A reference to the object to add.
@return <b>void</b>
*/
synchronized public void enqueue(Object q) {
if (((back + 1) % theQ.length) == front)
grow();
theQ[back] = q;
back = (back + 1) % theQ.length;
}
/**
Remove an object from the front of the queue. The returned object
is removed from the queue.
@return A reference to the <b>Object</b> at the front of the
queue. Returns <em>null</em> if the queue is empty.
*/
synchronized public Object dequeue() {
Object toReturn = null;
if (!empty()) {
toReturn = theQ[front];
front = (front + 1) % theQ.length;
}
return toReturn;
}
/**
Get the object at the front of the queue without removing it.
@return A reference to the <b>Object</b> at the front of the
queue.
*/
synchronized public Object peekFront() {
if (!empty())
return theQ[front];
else
return null;
}
/**
Determine how many objects are currently stored in the queue.
@return An <b>int</b> indicating the number of objects in the
queue.
*/
synchronized public int numElements() {
if (front <= back)
return (back - front);
else
return (back + (theQ.length - front));
}
/**
This function allows arbitrary queue elements to be removed.
Elements which are equal (according to the <em>equal</em>
function) to the argument are removed from the queue. Note that
this version of the function only removes the FIRST element
found. Use the <em>removeAll</em> function to remove ALL elements
equal to the argument.
@param <b>rem</b> The object to be removed from the queue.
@return <b>true</b> if an element was removed, <b>false</b>
otherwise.
*/
synchronized public boolean remove(Object rem) {
int i, x, y;
// PRAGMA [debug,osl.util.Queue] Log.println("<Queue.remove> Searching for element: " + rem);
// First track down the element to remove (if there is one)
for(i=front; i != back; i = (i + 1) % theQ.length)
if (rem.equals(theQ[i]))
break;
// If nothing found then return false...
if (i == back)
// PRAGMA [debug,osl.util.Queue] {
// PRAGMA [debug,osl.util.Queue] Log.println("<Queue.remove> Element not found, returning");
return false;
// PRAGMA [debug,osl.util.Queue] } else {
// PRAGMA [debug,osl.util.Queue] Log.println("<Queue.remove> Element found at position: " + i);
// PRAGMA [debug,osl.util.Queue] }
// Otherwise remove the one element. This is a bit of a hack but
// should be fairly efficient.
Object[] newQ = new Object[theQ.length];
for(x=front, y=0; x != back; x = (x + 1) % theQ.length)
if (x != i) {
newQ[y] = theQ[x];
y++;
}
theQ = newQ;
front = 0;
back = y;
return true;
}
/**
This function has the same behavior as <em>remove</em> except that
ALL matching elements are removed from the queue.
@param <b>rem</b> The object to be removed from the queue.
@return The number of elements removed.
*/
synchronized public int removeAll(Object rem) {
int i, match, x, y, z;
// Track down all the elements to remove.
int[] toRemove = new int[numElements()];
for(i=front, match=0; i != back; i = (i + 1) % theQ.length)
if (rem.equals(theQ[i])) {
toRemove[match] = i;
match++;
}
// See if anything matched, if not then just return
if (match == 0)
return 0;
// Now make a new array with all the matching elements removed
Object[] newQ = new Object[theQ.length];
for(x=front, y=0, z=0; x != back; x = (x + 1) % theQ.length)
if (z < match)
if (x != toRemove[z]) {
newQ[y] = theQ[x];
y++;
} else
z++;
else {
newQ[y] = theQ[x];
y++;
}
theQ = newQ;
front = 0;
back = y;
// match holds the number of things we removed
return match;
}
/**
The canonical toString method.
*/
synchronized public String toString() {
String returnVal = "Queue: ";
if (empty())
return returnVal + "no elements";
for(int i=front; i != back; i = (i + 1) % theQ.length)
returnVal = returnVal + theQ[i].toString() + " ";
return returnVal;
}
}