Method assignCall

java/Chapter 8/Question8_2/CallHandler.java:97–112

(Employee emp)

    /* An employee got free. Look for a waiting call that he/she can serve. Return true
     * if we were able to assign a call, false otherwise. */
    public boolean assignCall(Employee emp) {
        /* Check the queues, starting from the highest rank this employee can serve. */
        for (int rank = emp.getRank().getValue(); rank >= 0; rank--) {
            List<Call> que = callQueues.get(rank);
            
            /* Remove the first call, if any */
            if (que.size() > 0) {
	            Call call = que.remove(0); 
	            if (call != null) {
	                emp.receiveCall(call);
	                return true;
	            }
            }
        }
        return false;
    }
}