examples/include/teller.h

/**************************************************************************
 *
 * teller.h - Header for bank teller sample program.
 *
 * $Id$
 *
 ***************************************************************************
 *
 * Licensed to the Apache Software  Foundation (ASF) under one or more
 * contributor  license agreements.  See  the NOTICE  file distributed
 * with  this  work  for  additional information  regarding  copyright
 * ownership.   The ASF  licenses this  file to  you under  the Apache
 * License, Version  2.0 (the  "License"); you may  not use  this file
 * except in  compliance with the License.   You may obtain  a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the  License is distributed on an  "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
 * implied.   See  the License  for  the  specific language  governing
 * permissions and limitations under the License.
 *
 * Copyright 1994-2006 Rogue Wave Software.
 * 
 **************************************************************************/


#ifndef TELLER_H_INCLUDED
#define TELLER_H_INCLUDED

inline int lcg_rand (int n);

class Customer
{
public:

    int arrivalTime;
    int processTime;

    Customer (int at = 0)
        : arrivalTime (at),
          processTime (2 + lcg_rand (6)) {}

    bool done () {   // are we done with our transaction?
        return --processTime < 0;
    }

    bool operator< (const Customer& c) const {   // order by arrival time
        return arrivalTime < c.arrivalTime;
    }
};


class Teller
{
public:
    Teller (): free (true) { }

    bool isFree () {   // are we free to service new customer?
        if (free)
            return true;
        if (customer.done())
            free = true;
        return free;
    }

    void addCustomer (const Customer &c) {   // start serving new customer
        customer = c;
        free = false;
    }

private:

    bool     free;
    Customer customer;
};

#endif   // TELLER_H_INCLUDED