SingleServerQueuingSystem/server.cc at main · nothineazi/SingleServerQueuingSystem · GitHub

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#include "server.h"
#include "scheduler.h"

#include <malloc.h>
#include <cstdlib>
#include <iostream>
#include <fstream>
using namespace std;


Server :: Server () : a_(this), d_(this)
{
	queue_ = new Queue ();
}

double
Server :: exponential(double mean) {

	double r = (double)rand()/RAND_MAX;

	double ex = mean * log (r);

	return ex;
}

void
Server :: initialize () {
	status_ = 0;
	itemArrived_ = 0;

	double t = exponential (arrivalMean_);
	//trace_ << "interarrival time " << t << endl;
	a_.activate (t);
}

void
Server :: createTraceFile () {
	trace_.open ("trace.out", ios::out);
	if (!trace_) {
		cout << "cannot open the trace file.\n";
	}
	trace_<< "trace file for the simulation" << endl;
	trace_ << "format of the file" << endl;
	trace_ << "<event> <time> <item id> <server status> <queue size>" << endl << endl;
}

void
Server :: arrivalHandler () {
	Item* temp;

	itemArrived_++;
	temp = (Item*) malloc (sizeof(Item));
	temp->id_ = itemArrived_;

	trace_ << "a\t" << Scheduler::now () << "\t" << temp->id_ << "\t" << status_ << "\t" << queue_->length() << endl;

	if (status () == 0) {
		// write to the trace file
		status() = 1;
		trace_ << "s\t" << Scheduler::now () << "\t" << temp->id_ << "\t" << status_ << "\t" << queue_->length() << endl;
		itemInService_ = temp;

		double t = exponential (departureMean_);
		//trace_ << "\tservice time = " << t << endl;
		d_.activate (t);
	} else {
		queue_->enque(temp);
	}

	if (temp->id_ < 100) {
		double t = exponential (arrivalMean_);
		//trace_ << "\tinterarrival time = " << t << endl;
		a_.activate (t);
	}
}

void
Server :: departureHandler () {
	// write to the trace file
	if (queue_->length() > 0) {
		trace_ << "d\t" << Scheduler::now () << "\t" << itemInService_->id_ << "\t" << status_ << "\t" << queue_->length() << endl;
	} else {
		trace_ << "d\t" << Scheduler::now () << "\t" << itemInService_->id_ << "\t" << 0 << "\t" << queue_->length() << endl;
	}

	if (queue_->length() > 0) {
		itemInService_ = queue_->deque ();

		// write to the trace file
		trace_ << "s\t" << Scheduler::now () << "\t" << itemInService_->id_ << "\t" << status_ << "\t" << queue_->length() << endl;

		double t = exponential (departureMean_);
		//trace_ << "\tservice time = " << t << endl;
		d_.activate (t);
	} else {
		status () = 0;
		itemInService_ = 0;
	}
}