OpenSeSim/src/sesim/Exchange.java

package sesim;

import java.util.*;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.BiConsumer;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.json.JSONArray;
import org.json.JSONObject;

/**
 * @desc Echchange class
 * @author 7u83
 */
public class Exchange {

    ConcurrentLinkedQueue<Order> order_queue = new ConcurrentLinkedQueue();

    private double money_df = 10000;

    /**
     * Set the number of decimals used with money
     *
     * @param n number of decimals
     */
    public void setMoneyDecimals(int n) {
        money_df = Math.pow(10, n);
    }

    private double shares_df = 1;

    /**
     * Set the number of decimals for shares
     *
     * @param n number of decimals
     */
    public void setSharesDecimals(int n) {
        shares_df = Math.pow(10, n);
    }

    public double roundToDecimals(double val, double f) {
        return Math.floor(val * f) / f;
    }

    public double roundShares(double shares) {
        return roundToDecimals(shares, shares_df);
    }

    public double roundMoney(double money) {
        return roundToDecimals(money, money_df);
    }

    /**
     * Definition of order types
     */
    public enum OrderType {
        BUYLIMIT, SELLLIMIT, STOPLOSS, STOPBUY, BUY, SELL
    }

    IDGenerator account_id = new IDGenerator();
    //public static Timer timer = new Timer();

    public Scheduler timer; // = new Scheduler();

    public ArrayList<AutoTraderInterface> traders;

    /**
     *
     */
    public interface AccountListener {

        public void accountUpdated(Account a, Order o);
    }

    public interface OrderListener {

        public void orderUpdated(Order o);
    }

    HashMap<Integer, OHLCData> ohlc_data = new HashMap<>();

    public OHLCData buildOHLCData(int timeFrame) {
        OHLCData data = new OHLCData(timeFrame);
        if (this.quoteHistory == null) {
            return data;
        }

        Iterator<Quote> it = quoteHistory.iterator();
        while (it.hasNext()) {
            Quote q = it.next();
            data.realTimeAdd(q.time, (float) q.price, (float) q.volume);

        }

        return data;
    }

    public void injectMoney() {

        accounts.forEach(new BiConsumer() {
            @Override
            public void accept(Object t, Object u) {
                Account a = (Account) u;
                a.money += 20000.0;

            }

        });

    }

    public void pointZero() {
        accounts.forEach(new BiConsumer() {
            @Override
            public void accept(Object t, Object u) {
                Account a = (Account) u;
                a.money = 20000.0;

            }

        });

    }

    public OHLCData getOHLCdata(Integer timeFrame) {
        OHLCData data; //=new OHLCData(timeFrame);
        data = ohlc_data.get(timeFrame);
        if (data == null) {

            synchronized (executor) {
                data = this.buildOHLCData(timeFrame);
                ohlc_data.put(timeFrame, data);
            }
        }

        return data;
        /*        try {
            data = ohlc_data.get(timeFrame);
        } catch (Exception e) {
            data = null;
        }
        if (data == null) {
            data = buildOHLCData(timeFrame);
        }
         */

    }

    void updateOHLCData(Quote q) {
        Iterator<OHLCData> it = ohlc_data.values().iterator();
        while (it.hasNext()) {
            OHLCData data = it.next();
            data.realTimeAdd(q.time, (float) q.price, (float) q.volume);
        }
    }

    /**
     * Implements a trading account
     */
    public class Account implements Comparable {

        private AccountListener listener = null;

        private final double id;
        private double shares;
        private double money;
        protected AutoTraderInterface owner;

        private final ConcurrentHashMap<Long, Order> orders;

        @Override
        public int compareTo(Object a) {
            Account account = (Account) a;
            return this.id - account.id < 0 ? -1 : 1;
        }

        Account(double money, double shares) {
            id = (random.nextDouble() + (account_id.getNext()));
            orders = new ConcurrentHashMap();
            this.money = money;
            this.shares = shares;
        }

        public double getID() {
            return id;
        }

        public double getShares() {
            return shares;
        }

        public double getMoney() {
            return money;
        }

        public AutoTraderInterface getOwner() {
            return owner;
        }

        public ConcurrentHashMap<Long, Order> getOrders() {
            return orders;
        }

        public void setListener(AccountListener al) {
            this.listener = al;
        }

        public void update(Order o) {
            if (listener == null) {
                return;
            }
            listener.accountUpdated(this, o);
        }

    }

    public void createTraders(JSONArray traderdefs) {
        for (int i = 0; i < traderdefs.length(); i++) {
            JSONObject o = traderdefs.getJSONObject(i);

        }

        //    this.traders.add(randt);
        //    randt.setName("Bob");
        //    randt.start();
    }

    // private final ConcurrentHashMap<Double, Account> accounts = new ConcurrentHashMap<>();
    private ConcurrentHashMap<Double, Account> accounts;

    public double createAccount(double money, double shares) {

        Account a = new Account(money, shares);
        accounts.put(a.id, a);
        return a.id;
    }

    public enum OrderStatus {
        OPEN,
        PARTIALLY_EXECUTED,
        CLOSED,
        CANCELED
    }

    class OrderComparator implements Comparator<Order> {

        OrderType type;

        OrderComparator(OrderType type) {
            this.type = type;
        }

        @Override
        public int compare(Order left, Order right) {
            double d;
            switch (this.type) {
                case BUYLIMIT:
                case STOPBUY:
                case BUY:
                    d = right.limit - left.limit;
                    break;
                case SELLLIMIT:
                case STOPLOSS:
                case SELL:
                    d = left.limit - right.limit;
                    break;
                default:
                    d = 0;

            }
            if (d != 0) {
                return d > 0 ? 1 : -1;
            }

            d = right.initial_volume - left.initial_volume;
            if (d != 0) {
                return d > 0 ? 1 : -1;
            }

            if (left.id < right.id) {
                return -1;
            }
            if (left.id > right.id) {
                return 1;
            }

            return 0;

        }

    }

    HashMap<OrderType, SortedSet<Order>> order_books;

    IDGenerator order_id = new IDGenerator();

    public class Order {

        OrderStatus status;
        OrderType type;
        private double limit;
        private double volume;

        private final double initial_volume;
        private final long id;
        private final long created;

        private final Account account;

        double cost;

        Order(Account account, OrderType type, double volume, double limit) {
            id = order_id.getNext();
            this.account = account;
            this.type = type;
            this.limit = roundMoney(limit);
            this.volume = roundShares(volume);
            this.initial_volume = this.volume;
            this.created = timer.currentTimeMillis();
            this.status = OrderStatus.OPEN;
            this.cost = 0;
        }

        public long getID() {
            return id;
        }

        public double getVolume() {
            return volume;
        }

        public double getLimit() {
            return limit;
        }

        public OrderType getType() {
            return type;
        }

        public double getExecuted() {
            return initial_volume - volume;
        }

        public double getInitialVolume() {
            return initial_volume;
        }

        public double getCost() {
            return cost;
        }

        public double getAvaragePrice() {
            double e = getExecuted();
            if (e <= 0) {
                return -1;
            }
            return cost / e;
        }

        public Account getAccount() {
            return account;
        }

        public OrderStatus getOrderStatus() {
            return status;
        }

        public long getCreated() {
            return created;
        }
    }

    /**
     * Histrory of quotes
     */
    public TreeSet<Quote> quoteHistory; // = new TreeSet<>();

    final void initExchange() {
        buy_orders = 0;
        sell_orders = 0;
        timer = new Scheduler();         //  timer = new Scheduler();
        //       random = new Random(12);
        random = new Random();

        quoteHistory = new TreeSet();
        accounts = new ConcurrentHashMap<>();

        traders = new ArrayList();

        num_trades = 0;

        this.ohlc_data = new HashMap();

        // Create order books
        order_books = new HashMap();
        for (OrderType type : OrderType.values()) {
            order_books.put(type, new TreeSet(new OrderComparator(type)));
        }

    }

    /**
     * Constructor
     */
    public Exchange() {
        qrlist = (new CopyOnWriteArrayList<>());

        initExchange();
        executor.start();

    }

    public class Statistics {

        public long trades;
        public long orders;

        void reset() {
            trades = 0;

        }

        Statistics() {

        }

    };

    Statistics statistics;

    long num_trades = 0;
    long num_orders = 0;

    public Statistics getStatistics() {
        Statistics s = new Statistics();
        s.trades = num_trades;
        s.orders = num_orders;
        return s;

    }

    class Executor extends Thread {

        @Override
        public void run() {
            synchronized (this) {
                try {
                    while (true) {

                        this.wait();

                        Order o;
                        while (null != (o = order_queue.poll())) {
                            addOrderToBook(o);
                            Account a = o.account;
                            a.orders.put(o.id, o);
                            a.update(o);
                            executeOrders();
                        }

                        updateBookReceivers(OrderType.SELLLIMIT);
                        updateBookReceivers(OrderType.BUYLIMIT);
                    }

                } catch (InterruptedException ex) {
                    Logger.getLogger(Exchange.class.getName()).log(Level.SEVERE, null, ex);
                }

            }
        }

    }

    final Executor executor = new Executor();

    /**
     * Start the exchange
     */
    public void start() {
        timer.start();

    }

    public void reset() {
        initExchange();
    }

    public void terminate() {
        timer.terminate();
    }

    /*
    class BidBook extends TreeSet {

        TreeSet t = new TreeSet();

        boolean hallo() {
            t.comparator();
            return true;
        }
    }
     */
    public SortedSet<Quote> getQuoteHistory(long start) {

        Quote s = new Quote();
        s.time = start * 1000;
        s.id = 0;

        TreeSet<Quote> result = new TreeSet<>();
        result.addAll(this.quoteHistory.tailSet(s));

        return result;

    }

    public final String CFG_MONEY_DECIMALS = "money_decimals";
    public final String CFG_SHARES_DECIMALS = "shares_decimals";

    public void putConfig(JSONObject cfg) {
        try {
            this.setMoneyDecimals(cfg.getInt(CFG_MONEY_DECIMALS));
            this.setSharesDecimals(cfg.getInt(CFG_SHARES_DECIMALS));
        } catch (Exception e) {

        }

    }

    public Double getBestPrice() {
        System.out.printf("Get BP\n");
        SortedSet<Order> bid = order_books.get(OrderType.BUYLIMIT);
        SortedSet<Order> ask = order_books.get(OrderType.SELLLIMIT);

        Quote lq = this.getLastQuoete();
        Order b = null, a = null;
        if (!bid.isEmpty()) {
            b = bid.first();
        }
        if (!ask.isEmpty()) {
            a = ask.first();
        }

        // If there is neither bid nor ask and no last quote
        // we can't return a quote
        if (lq == null && b == null && a == null) {
            return null;
        }

        // there is bid and ask
        if (a != null && b != null) {
            Quote q = new Quote();
            System.out.printf("aaaaa bbbbb %f %f \n", a.limit, b.limit);
            // if there is no last quote calculate from bid and ask
            //if (lq == null) {
            double rc = (bid.first().limit + ask.first().limit) / 2.0;
            System.out.printf("RCRC2.0: %f\n", rc);
            return rc;

            // }
/*
            if (lq.price < b.limit) {
                return b.limit;

            }
            if (lq.price > a.limit) {
                return a.limit;

            }
            return lq.price;
             */
        }

        if (a != null) {
            Quote q = new Quote();
            if (lq == null) {

                return a.limit;

            }
            if (lq.price > a.limit) {
                return a.limit;

            }
            return lq.price;
        }

        if (b != null) {
            Quote q = new Quote();
            if (lq == null) {
                return b.limit;

            }
            if (lq.price < b.limit) {
                return b.limit;

            }

            return lq.price;
        }

        if (lq == null) {
            return null;
        }

        return lq.price;
    }

    public Quote getBestPrice_0() {

        synchronized (executor) {
            SortedSet<Order> bid = order_books.get(OrderType.BUYLIMIT);
            SortedSet<Order> ask = order_books.get(OrderType.SELLLIMIT);

            Quote lq = this.getLastQuoete();
            Order b = null, a = null;
            if (!bid.isEmpty()) {
                b = bid.first();
            }
            if (!ask.isEmpty()) {
                a = ask.first();
            }

            // If there is neither bid nor ask and no last quote
            // we can't return a quote
            if (lq == null && b == null && a == null) {
                return null;
            }

            // there is bid and ask
            if (a != null && b != null) {
                Quote q = new Quote();

                // if there is no last quote calculate from bid and ask
                     if (lq == null) {
                q.price = (bid.first().limit + ask.first().limit) / 2.0;
                return q;
                      }

                 if (lq.price < b.limit) {
                    q.price = b.limit;
                    return q;
                }
                if (lq.price > a.limit) {
                    q.price = a.limit;
                    return q;
                }
                return lq;
                             }

            if (a != null) {
                Quote q = new Quote();
                if (lq == null) {

                    q.price = a.limit;
                    return q;
                }
                if (lq.price > a.limit) {
                    q.price = a.limit;
                    return q;
                }
                return lq;
            }

            if (b != null) {
                Quote q = new Quote();
                if (lq == null) {
                    q.price = b.limit;
                    return q;
                }
                if (lq.price < b.limit) {
                    q.price = b.limit;
                    return q;
                }

                return lq;
            }

            return lq;
        }
    }

    // Class to describe an executed order
    // QuoteReceiver has to be implemented by objects that wants 
    // to receive quote updates  	
    public interface QuoteReceiver {

        void UpdateQuote(Quote q);
    }

    /**
     * Bookreceiver Interface
     */
    public interface BookReceiver {

        void UpdateOrderBook();
    }

    final private ArrayList<BookReceiver> ask_bookreceivers = new ArrayList<>();
    final private ArrayList<BookReceiver> bid_bookreceivers = new ArrayList<>();

    private ArrayList<BookReceiver> selectBookReceiver(OrderType t) {
        switch (t) {
            case SELLLIMIT:
                return ask_bookreceivers;
            case BUYLIMIT:
                return bid_bookreceivers;
        }
        return null;
    }

    public void addBookReceiver(OrderType t, BookReceiver br) {

        if (br == null) {
//            System.out.printf("Br is null\n");
        } else {
            //          System.out.printf("Br is not Nukk\n");
        }

        ArrayList<BookReceiver> bookreceivers;
        bookreceivers = selectBookReceiver(t);
        if (bookreceivers == null) {
//            System.out.printf("null in bookreceivers\n");
        }
        bookreceivers.add(br);
    }

    void updateBookReceivers(OrderType t) {
        ArrayList<BookReceiver> bookreceivers;
        bookreceivers = selectBookReceiver(t);

        Iterator<BookReceiver> i = bookreceivers.iterator();
        while (i.hasNext()) {
            i.next().UpdateOrderBook();
        }

    }

    // Here we store the list of quote receivers
    private final List<QuoteReceiver> qrlist;

    /**
     *
     * @param qr
     */
    public void addQuoteReceiver(QuoteReceiver qr) {
        qrlist.add(qr);
    }

    // send updated quotes to all quote receivers
    private void updateQuoteReceivers(Quote q) {
        Iterator<QuoteReceiver> i = qrlist.iterator();
        while (i.hasNext()) {
            i.next().UpdateQuote(q);
        }
    }

    // long time = 0;
    //double theprice = 12.9;
//    long orderid = 1;
    double lastprice = 100.0;
    long lastsvolume;

    // private final Locker tradelock = new Locker();
    public ArrayList<Order> getOrderBook(OrderType type, int depth) {

        SortedSet<Order> book = order_books.get(type);
        if (book == null) {
            return null;
        }
        ArrayList<Order> ret;
        synchronized (executor) {

            ret = new ArrayList<>();

            Iterator<Order> it = book.iterator();

            for (int i = 0; i < depth && it.hasNext(); i++) {
                Order o = it.next();
                //   System.out.print(o.volume);
                if (o.volume <= 0) {
                    System.out.printf("Volume < 0\n");
                    System.exit(0);
                }
                ret.add(o);
            }
            // System.out.println();
        }
        return ret;
    }

    public Quote getLastQuoete() {
        if (this.quoteHistory.isEmpty()) {
            return null;
        }

        return this.quoteHistory.last();
    }

    private void transferMoneyAndShares(Account src, Account dst, double money, double shares) {
        src.money -= money;
        dst.money += money;
        src.shares -= shares;
        dst.shares += shares;

    }

    public boolean cancelOrder(double account_id, long order_id) {
        Account a = accounts.get(account_id);
        if (a == null) {
            return false;
        }

        boolean ret = false;

        Order o;

//        System.out.printf("Getting executor %d\n", Thread.currentThread().getId());
        synchronized (executor) {
//            System.out.printf("Have executor %d\n", Thread.currentThread().getId());
            o = a.orders.get(order_id);

            //   System.out.print("The Order:"+o.limit+"\n");
            if (o != null) {
                SortedSet ob = order_books.get(o.type);

                boolean rc = ob.remove(o);

                a.orders.remove(o.id);
                a.update(o);
                ret = true;
            }

        }
        if (ret) {
            this.updateBookReceivers(o.type);
        }
//        System.out.printf("Levave executor %d\n", Thread.currentThread().getId());
        return ret;
    }

    Random random;

    public int randNextInt() {
        return random.nextInt();

    }

    public int randNextInt(int bounds) {

        return random.nextInt(bounds);

    }

    public double randNextDouble() {
        return random.nextDouble();

    }

    /**
     *
     * @param o
     */
    long nextQuoteId = 0;

    public double fairValue = 0;

    private void removeOrderIfExecuted(Order o) {
        if (o.getAccount().getOwner().getName().equals("Tobias0")) {
//            System.out.printf("Tobias 0 test\n");
        }

        if (o.volume != 0) {

            if (o.getAccount().getOwner().getName().equals("Tobias0")) {
//                System.out.printf("Patially remove tobias\n");
            }

            o.status = OrderStatus.PARTIALLY_EXECUTED;
            o.account.update(o);
            return;
        }

        if (o.getAccount().getOwner().getName().equals("Tobias0")) {
//            System.out.printf("Fully remove tobias\n");
        }

        o.account.orders.remove(o.id);

        SortedSet book = order_books.get(o.type);

        book.remove(book.first());

        o.status = OrderStatus.CLOSED;
        o.account.update(o);

    }

    void checkSLOrders(double price) {
        SortedSet<Order> sl = order_books.get(OrderType.STOPLOSS);
        SortedSet<Order> ask = order_books.get(OrderType.SELLLIMIT);

        if (sl.isEmpty()) {
            return;
        }

        Order s = sl.first();
        if (price <= s.limit) {
            sl.remove(s);

            s.type = OrderType.SELL;
            addOrderToBook(s);

//            System.out.printf("Stoploss hit %f %f\n", s.volume, s.limit);
        }
    }

    public void executeUnlimitedOrders() {

    }

    private void finishTrade(Order b, Order a, double price, double volume) {
        // Transfer money and shares
        transferMoneyAndShares(b.account, a.account, volume * price, -volume);

        // Update volume
        b.volume -= volume;
        a.volume -= volume;

        b.cost += price * volume;
        a.cost += price * volume;

        removeOrderIfExecuted(a);
        removeOrderIfExecuted(b);
    }

    /**
     *
     */
    public void executeOrders() {

//        System.out.printf("Exec Orders\n");
        SortedSet<Order> bid = order_books.get(OrderType.BUYLIMIT);
        SortedSet<Order> ask = order_books.get(OrderType.SELLLIMIT);

        SortedSet<Order> ul_buy = order_books.get(OrderType.BUY);
        SortedSet<Order> ul_sell = order_books.get(OrderType.SELL);

        double volume_total = 0;
        double money_total = 0;

        while (true) {

            // Match unlimited sell orders against unlimited buy orders
            if (!ul_sell.isEmpty() && !ul_buy.isEmpty()) {
                Order a = ul_sell.first();
                Order b = ul_buy.first();

                Double price = getBestPrice();
                if (price == null) {
                    break;
                }

                double volume = b.volume >= a.volume ? a.volume : b.volume;
                finishTrade(b, a, price, volume);
                volume_total += volume;
                money_total += price * volume;
                this.checkSLOrders(price);

                //System.out.printf("Cannot match two unlimited orders!\n");
                //System.exit(0);
            }

            while (!ul_buy.isEmpty() && !ask.isEmpty()) {
                Order a = ask.first();
                Order b = ul_buy.first();
                double price = a.limit;
                double volume = b.volume >= a.volume ? a.volume : b.volume;
                finishTrade(b, a, price, volume);
                volume_total += volume;
                money_total += price * volume;
                this.checkSLOrders(price);

            }

            // Match unlimited sell orders against limited buy orders
            while (!ul_sell.isEmpty() && !bid.isEmpty()) {
                Order b = bid.first();
                Order a = ul_sell.first();
                double price = b.limit;
                double volume = b.volume >= a.volume ? a.volume : b.volume;
                finishTrade(b, a, price, volume);
                volume_total += volume;
                money_total += price * volume;
                this.checkSLOrders(price);
            }

            // Match limited against limited orders
            if (bid.isEmpty() || ask.isEmpty()) {
                break;
            }

            Order b = bid.first();
            Order a = ask.first();

            if (b.limit < a.limit) {
                break;
            }

            // There is a match, calculate price and volume
            double price = b.id < a.id ? b.limit : a.limit;
            double volume = b.volume >= a.volume ? a.volume : b.volume;

            finishTrade(b, a, price, volume);
            volume_total += volume;
            money_total += price * volume;

            num_trades++;

            this.checkSLOrders(price);

        }

        if (volume_total == 0) {
            return;
        }
        Quote q = new Quote();
        q.price = money_total / volume_total;
        q.volume = volume_total;
        q.time = timer.currentTimeMillis();

        this.quoteHistory.add(q);
        this.updateOHLCData(q);

        this.updateQuoteReceivers(q);

    }

    long buy_orders = 0;
    long sell_orders = 0;

    private void addOrderToBook(Order o) {
        order_books.get(o.type).add(o);
        switch (o.type) {
            case BUY:
            case BUYLIMIT:
                buy_orders++;
                break;
            case SELL:
            case SELLLIMIT:
                sell_orders++;
                break;

        }
//        System.out.printf("B/S  %d/%d Failed B/S: %d/%d\n", buy_orders, sell_orders,buy_failed,sell_failed);
    }

    long buy_failed = 0;
    long sell_failed = 0;
 

    /**
     *
     * @param account_id
     * @param type
     * @param volume
     * @param limit
     * @return
     */
    public long createOrder(double account_id, OrderType type, double volume, double limit) {

        Account a = accounts.get(account_id);
        if (a == null) {
            return -1;
        }
        


        Order o = new Order(a, type, volume, limit);
        if (o.volume <= 0 || o.limit <= 0) {

            switch (o.type) {
                case SELL:
                case SELLLIMIT:
                    sell_failed++;
                    break;
                case BUY:
                case BUYLIMIT:
                    buy_failed++;
                    break;
            }
            
        

            return -1;
        }

//        System.out.printf("Getting executor in create Order\n", Thread.currentThread().getId());
        synchronized (executor) {

            num_orders++;
            addOrderToBook(o);
            a.orders.put(o.id, o);
            a.update(o);

            executeOrders();
            updateBookReceivers(OrderType.SELLLIMIT);
            updateBookReceivers(OrderType.BUYLIMIT);

//            System.out.printf("Order to Queeue %s %f %f\n",o.type.toString(),o.volume,o.limit);
//            order_queue.add(o);
//            executor.notify();
        }
//       a.update(o);
        return o.id;
    }

    public double getBestLimit(OrderType type) {
        Order o = order_books.get(type).first();
        if (o == null) {
            return -1;
        }
        return o.limit;
    }

    public int getNumberOfOpenOrders(double account_id) {
        Account a = accounts.get(account_id);
        if (a == null) {
            return 0;
        }
        return a.orders.size();
    }

    public Account getAccount(double account_id) {
        return accounts.get(account_id);
    }
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    

    /*public AccountData getAccountData(double account_id) {
        tradelock.lock();
        Account a = accounts.get(account_id);
        tradelock.unlock();
        if (a == null) {
            return null;
        }

        AccountData ad = new AccountData();
        ad.id = account_id;
        ad.money = a.money;
        ad.shares = a.shares;

        ad.orders = new ArrayList<>();
        ad.orders.iterator();

        a.orders.values();
        Set s = a.orders.keySet();
        Iterator it = s.iterator();

        while (it.hasNext()) {
            long x = (long) it.next();

            Order o = a.orders.get(x);

            OrderData od = new OrderData();
            od.id = o.id;
            od.limit = o.limit;
            od.volume = o.volume;
            ad.orders.add(od);
        }

        //System.exit(0);
        //a.orders.keySet();
        //KeySet ks = a.orders.keySet();
        return ad;
    }
     */
    public ArrayList<OrderData> getOpenOrders(double account_id) {

        Account a = accounts.get(account_id);
        if (a == null) {
            return null;
        }

        ArrayList<OrderData> al = new ArrayList();

        Iterator it = a.orders.entrySet().iterator();
        while (it.hasNext()) {
            Order o = (Order) it.next();
            OrderData od = new OrderData();
            od.limit = o.limit;
            od.volume = o.initial_volume;
            od.executed = o.initial_volume - o.volume;
            od.id = o.id;
            al.add(od);
        }

        return al;
    }

}