/// <summary>
/// Sends the execution report back to the order source.
/// </summary>
/// <param name="tenant">The identifier of the originator of the order.</param>
/// <param name="message">The execution report.</param>
public void SendReport(String tenant, Teraque.Message message)
{
// Add this execution report to the queue of messages that this broker must return to the order source. Note that the thread used to send the message
// will go to sleep if there are no more messages to be sent, so we need to wake it up if it's waiting.
lock (this.syncRoot)
{
SourceContext sourceContext = this.sourceContextMap[tenant];
Queue <Teraque.Message> messageQueue = sourceContext.MessageQueue;
messageQueue.Enqueue(message);
if (messageQueue.Count == 1)
{
sourceContext.OrderEvents.Set();
}
}
}
/// <summary>
/// Initializes a new instance of the BrokerContext class.
/// </summary>
public BrokerContext(BrokerInfo brokerInfo)
{
// Initialize the object.
this.nameField = brokerInfo.Name;
this.symbolField = brokerInfo.Symbol;
// This document contains the configuration of the connections used to route orders back to the source of the order.
XDocument xDocument = XDocument.Load(Environment.ExpandEnvironmentVariables(Settings.Default.SourceConfigurationFile));
// This will load in the properties of each of sources into a dictionary that is used to manage the stream of messages back to the source that
// originated the order.
foreach (XElement xElement in xDocument.Root.Elements("Source"))
{
// Don't bother to connect to the source if they aren't active.
Boolean isActive = Convert.ToBoolean(xElement.Attribute("IsActive").Value);
if (isActive)
{
// This provides an operating context for the connection back to the source of the order.
SourceContext sourceContext = new SourceContext();
// This is the name of the source.
String tenant = xElement.Attribute("Name").Value;
// This properties are used to connect us to a web service that will deliver the messages back to the source.
ClientInfo clientInfo = sourceContext.ClientInfo;
clientInfo.EndpointName = xElement.Attribute("Endpoint").Value;
clientInfo.Password = xElement.Attribute("Password").Value;
clientInfo.UserName = xElement.Attribute("UserName").Value;
// This thread will asynchronously pull messages out of the message queue and deliver them to the source.
Thread thread = new Thread(this.SourceThread);
thread.Start(sourceContext);
thread.Name = String.Format("{0} connection to {1}", brokerInfo.Symbol, tenant);
sourceContext.Thread = thread;
// This acts as a routing map to deliver messages back to the source of the orders based on the name of the source.
this.sourceContextMap.Add(tenant, sourceContext);
}
}
}
/// <summary>
/// Thread used to communicate with the source of the orders.
/// </summary>
/// <param name="state">The generic thread parameter.</param>
public void SourceThread(Object state)
{
// This data structure provides the context for this thread. It contains all the information needed to manage a connection to a tenant that has
// generated orders and is now waiting for execution reports.
SourceContext sourceContext = state as SourceContext;
// Construct a new web service for the source of the order so we can report our executions.
ClientInfo clientInfo = sourceContext.ClientInfo;
WebServiceClient webServiceClient = new WebServiceClient(clientInfo.EndpointName);
webServiceClient.ClientCredentials.UserName.UserName = clientInfo.UserName;
webServiceClient.ClientCredentials.UserName.Password = clientInfo.Password;
// This thread will continue to pull messages out of the queue
while (true)
{
// The thread will wait here until there is an order to process.
sourceContext.OrderEvents.WaitOne();
List <Teraque.Message> messages = new List <Teraque.Message>();
lock (this.syncRoot)
{
Queue <Teraque.Message> messageQueue = sourceContext.MessageQueue;
while (messageQueue.Count != 0 && messages.Count < BrokerContext.chunkSize)
{
messages.Add(messageQueue.Dequeue());
}
if (messageQueue.Count == 0)
{
sourceContext.OrderEvents.Reset();
}
}
// This will guarantee that the execution report is returned to the order originator. If it can't send the message, it will try to reconstruct the
// web service and try again.
while (true)
{
try
{
// If the web service has been faulted (or timed out), then reopen it. Note that we provide a healthy sleep time so that we don't
// constantly spin here when the simulator isn't available.
if (webServiceClient.State != CommunicationState.Opened)
{
webServiceClient = new WebServiceClient(clientInfo.EndpointName);
webServiceClient.ClientCredentials.UserName.UserName = clientInfo.UserName;
webServiceClient.ClientCredentials.UserName.Password = clientInfo.Password;
}
// If the message sent to the web service is successful, then we'll break out of the infinite loop. Otherwise, we'll keep on trying to send
// this message until we're terminated externally.
webServiceClient.ReportExecution(messages.ToArray());
break;
}
catch
{
// If the web service has been faulted (or timed out), then reopen it. Note that we provide a healthy sleep time so that we don't
// constantly spin here when the simulator isn't available.
if (webServiceClient.State != CommunicationState.Opened)
{
webServiceClient = new WebServiceClient(clientInfo.EndpointName);
webServiceClient.ClientCredentials.UserName.UserName = clientInfo.UserName;
webServiceClient.ClientCredentials.UserName.Password = clientInfo.Password;
Thread.Sleep(BrokerContext.retryTime);
}
}
}
}
}
