public void startTime() throws FileNotFoundException {
PrintWriter outFile = new PrintWriter("output.data");
Pcb cpuProc;
while (!arrivalQueue.isEmpty() || !readyQueue.isEmpty()) {
if (!arrivalQueue.isEmpty()) // makes pointer to head object of arrival queue
test = arrivalQueue.peek();
if (test.getArrivalTime() == sysTime
&& !arrivalQueue.isEmpty()) // adds to ready queue from arrival queue
{
readyQueue.add(arrivalQueue.remove());
// System.out.println("Job " + test.getId() + " entered the Ready Queue.");
}
if (cpu.currentProc == null && !readyQueue.isEmpty()) // puts the first job in cpu
{
cpu.currentProc = readyQueue.remove();
// System.out.println("This job is in the cpu and has an id of: " +
// cpu.currentProc.getId());
outFile.print(sysTime + " "); // entered cpu
}
if (!readyQueue.isEmpty()) test = readyQueue.peek();
if (cpu.currentProc != null
&& !readyQueue.isEmpty()
&& cpu.currentProc.getPriority() < test.getPriority()) {
Pcb cpuTemp = cpu.currentProc;
outFile.println(sysTime + " " + cpu.currentProc.getId());
cpu.currentProc = readyQueue.remove();
readyQueue.add(cpuTemp);
outFile.print(sysTime + " "); // entered cpu
// System.out.println("Job " + cpu.currentProc.getId() + " entered the CPU. With priority
// " + cpu.currentProc.getPriority());
}
if (cpu.currentProc != null && cpu.currentProc.getCpuBurstTime() == 0) {
outFile.println(sysTime + " " + cpu.currentProc.getId()); // lefted cpu
cpu.currentProc = readyQueue.remove();
outFile.print(sysTime + " "); // entered cpu
// System.out.println("the process in the cpu got it's burst time to zero.");
// System.out.println("Job " + cpu.currentProc.getId() + " entered the CPU. With priority
// " + cpu.currentProc.getPriority());
}
if (cpu.currentProc != null) {
cpu.currentProc.setCpuBurstTime(cpu.currentProc.getCpuBurstTime() - 1);
// System.out.println("Tried to subtact one from cpu burst time");
}
sysTime++;
}
while (cpu.currentProc.getCpuBurstTime() != 0) {
cpu.currentProc.setCpuBurstTime(cpu.currentProc.getCpuBurstTime() - 1);
sysTime++;
}
System.out.println("Jobs are finished");
outFile.println(sysTime + " " + cpu.currentProc.getId()); // lefted cpu
outFile.close();
// after both Queues are empty finish the process in the cpu
}
