/// <summary>
/// Simulation of brokers executing destination orders.
/// </summary>
static void SimulateBroker(Object state)
{
// This defines the operating properties of this broker simulation.
BrokerContext brokerContext = state as BrokerContext;
// Run this until shut down from an external thread.
while (true)
{
// This will wait until there is an order to handle.
BrokerSimulator.orderEvent.WaitOne();
try
{
// Access to the market data must be exclusive while we find and order and process it.
Monitor.Enter(MarketData.SyncRoot);
// This will put the thread to sleep until some event comes along (like a new order) that requires its attension. The main idea is that we
// don't want to leech the CPU while waiting for orders to simulate.
if (MarketData.Order.Rows.Count == 0)
{
BrokerSimulator.orderEvent.Reset();
continue;
}
// This will grab a random order and see if it can be claimed by this broker. If the order isn't available, then we'll allow other threads to
// try processing the order. We'll keep this up until either an order is available (and not claimed by another simulated broker) or until we've
// exhausted the order book.
Int32 orderIndex = brokerContext.Random.Next(MarketData.Order.Rows.Count);
MarketDataModel.OrderRow orderRow = MarketData.Order[orderIndex];
if (!orderRow.IsBrokerIdNull() && orderRow.BrokerId != brokerContext.Symbol)
{
Monitor.Exit(MarketData.SyncRoot);
Thread.Sleep(0);
Monitor.Enter(MarketData.SyncRoot);
continue;
}
// This broker has now taken possession of the order. No one else will touch it.
if (orderRow.IsBrokerIdNull())
{
orderRow.BrokerId = brokerContext.Symbol;
}
// This will select a random action to perform on this order.
Int32 orderActionIndex = brokerContext.Random.Next(Enum.GetValues(typeof(OrderAction)).Length);
BrokerSimulator.actionMap[(OrderAction)Enum.GetValues(typeof(OrderAction)).GetValue(orderActionIndex)](brokerContext, orderRow);
}
finally
{
Monitor.Exit(MarketData.SyncRoot);
}
// This allows other threads the chance to run. Note that the broker simulation will run flat out until the order book has been exhausted. We
// should eventually put a parameter on this to slow it down in order to demonstrate a more realistic feed.
Thread.Sleep(Convert.ToInt32(BrokerSimulator.ExecutionFrequency));
}
}
/// <summary>
/// Simulates the execution of an order.
/// </summary>
/// <param name="orderRow">The order to be executed.</param>
static void ExecuteOrder(BrokerContext brokerContext, MarketDataModel.OrderRow orderRow)
{
// Create an execution.
MarketDataModel.ExecutionRow executionRow = MarketData.Execution.NewExecutionRow();
executionRow.ExecutionId = Guid.NewGuid();
executionRow.OrderId = orderRow.OrderId;
// This execution needs a random number of shares to fill. We can't overcommit the order, so first we need to count up how many shares have already
// been executed on this order. Then we can calculated the 'leaves' quantity (the amount remaining to be executed).
Decimal executedQuantity = 0.0m;
foreach (MarketDataModel.ExecutionRow childExecutionRow in orderRow.GetExecutionRows())
{
executedQuantity += childExecutionRow.Quantity;
}
Decimal leavesQuantity = orderRow.QuantityOrdered - executedQuantity;
// This will generate either a random fill or finish the order with an odd lot.
executionRow.Quantity = Math.Min(leavesQuantity, brokerContext.Random.Next(1, 100) * 100);
// The execution requires a price. The price simulator will provide a bid price or ask price depending on the side of the order.
MarketDataModel.PriceRow priceRow = MarketData.Price.FindByFeedSymbol("US TICKER", orderRow.Symbol);
SideCode sideCode = (SideCode)orderRow.SideCode;
executionRow.Price = 0.0m;
if (priceRow != null)
{
executionRow.Price = sideCode == SideCode.Buy || sideCode == SideCode.BuyCover ? priceRow.BidPrice : priceRow.AskPrice;
}
// We're record this execution in the broker's book.
MarketData.Execution.AddExecutionRow(executionRow);
// Now that the order is recorded, we can update the 'leaves' to reflect the execution.
leavesQuantity -= executionRow.Quantity;
// This message is sent back to the customer to record the execution. Note that we pick the web service to use from a mapping table. This table
// associates the name of the firm with a preconfigured web service to communicate with that firm.
Message message = new Message();
message.ExecBroker = brokerContext.Symbol;
message.Symbol = orderRow.Symbol;
message.SenderCompID = orderRow.Source;
message.Price = executionRow.Price;
message.OrderID = orderRow.OrderId.ToString();
message.OrderStatusCode = leavesQuantity == 0.0M ? OrderStatusCode.Filled : OrderStatusCode.PartiallyFilled;
message.CumQty = executionRow.Quantity;
message.ClOrdID = orderRow.CustomerOrderId;
message.LeavesQty = leavesQuantity;
// If this order is filled then remove it from the simulated order book. If the order book is empty, then put the broker threads to sleep.
if (leavesQuantity == 0)
{
MarketData.Order.RemoveOrderRow(orderRow);
if (MarketData.Order.Count == 0)
{
BrokerSimulator.orderEvent.Reset();
}
}
// This places the message in a queue of messages owned by the current broker that will route the message back to the source of the order.
brokerContext.SendReport(message.SenderCompID, message);
}