feat: add Lab4

Lab1/ServiceCounter.java

@@ -0,0 +1,64 @@
+/**
+ * This is a data class which holds information about a counter. It has a
+ * incrementing counter for the conuter Id.
+ * 
+ * @author Yadunand Prem
+ * @version CS2030S AY22/23 Semester 2
+ */
+public class ServiceCounter implements Comparable<ServiceCounter> {
+  private static int lastId;
+
+  private final int id;
+  private boolean available;
+  private Queue<Customer> queue;
+
+  public boolean isAvailable() {
+    return available;
+  }
+
+  public void occupy() {
+    this.available = false;
+  }
+
+  public void free() {
+    this.available = true;
+  }
+
+  public boolean isQueueFull() {
+    return this.queue.isFull();
+  }
+
+  public boolean isQueueEmpty() {
+    return this.queue.isEmpty();
+  }
+
+  public void joinQueue(Customer customer) {
+    this.queue.enq(customer);
+  }
+
+  public Customer leaveQueue() {
+    return this.queue.deq();
+  }
+
+  public ServiceCounter(int queueSize) {
+    this.id = lastId++;
+    this.available = true;
+    this.queue = new Queue<Customer>(queueSize);
+  }
+
+  @Override
+  public String toString() {
+    return String.format("S%s %s", id, this.queue);
+  }
+
+  @Override
+  public int compareTo(ServiceCounter o) {
+    if (this.queue.length() < o.queue.length()) {
+      return -1;
+    }
+    if (this.id < o.id) {
+      return -1;
+    }
+    return 1;
+  }
+}