/// <summary>
/// Parse a transaction out of the XML file.
/// </summary>
/// <param name="xmlNode">The node where the transaction has been found.</param>
private void ParseTransaction(XmlNode xmlNode)
{
// Create an explicit transaction for the methods found at this node.
this.transaction = this.batch.Transactions.Add();
// The <Method> tag specifies the name assembly, type and method name for this operation. The parameters to the method
// call will be nested under this heading.
foreach (XmlNode methodNode in xmlNode.SelectNodes("method"))
{
ParseMethod(methodNode);
}
}
static int Main(string[] args)
{
// If this flag is set during the processing of the file, the program will exit with an error code.
bool hasErrors = false;
try
{
// Defaults
batchSize = 100;
assemblyName = "External Service";
nameSpaceName = "MarkThree.Quasar.External";
// The command line parser is driven by different states that are triggered by the flags read. Unless a flag has been
// read, the command line parser assumes that it's reading the file name from the command line.
argumentState = ArgumentState.FileName;
// Parse the command line for arguments.
foreach (string argument in args)
{
// Decode the current argument into a state change (or some other action).
if (argument == "-a")
{
argumentState = ArgumentState.Assembly; continue;
}
if (argument == "-b")
{
argumentState = ArgumentState.BatchSize; continue;
}
if (argument == "-n")
{
argumentState = ArgumentState.NameSpace; continue;
}
if (argument == "-i")
{
argumentState = ArgumentState.FileName; continue;
}
// The parsing state will determine which variable is read next.
switch (argumentState)
{
case ArgumentState.Assembly:
assemblyName = argument;
break;
case ArgumentState.BatchSize:
batchSize = Convert.ToInt32(argument);
break;
case ArgumentState.FileName:
fileName = argument;
break;
case ArgumentState.NameSpace:
nameSpaceName = argument;
break;
}
// The default state is to look for the input file name on the command line.
argumentState = ArgumentState.FileName;
}
// Throw a usage message back at the user if no file name was given.
if (fileName == null)
{
throw new Exception("Usage: Loader.Algorithm -i <FileName>");
}
// Open up the file containing all the broker.
BrokerReader brokerReader = new BrokerReader(fileName);
// Loading the database involves creating a batch of commands and sending them off as a transaction. This gives
// the server a chance to pipeline a large chunk of processing, without completely locking up the server for the
// entire set of data. This will construct a header for the command batch which gives information about which
// assembly contains the class that is used to load the data.
Batch batch = new Batch();
TransactionPlan transactionPlan = batch.Transactions.Add();
AssemblyPlan assemblyPlan = batch.Assemblies.Add(assemblyName);
TypePlan typePlan = assemblyPlan.Types.Add(string.Format("{0}.{1}", nameSpaceName, "Broker"));
// Read the file until an EOF is reached.
while (true)
{
// This counter keeps track of the number of records sent. When the batch is full, it's sent to the server to be
// executed as a single transaction.
int batchCounter = 0;
// Read the next broker from the input stream. A 'null' is returned when we've read past the end of file.
Broker broker = brokerReader.ReadBroker();
if (broker != null)
{
// Create a new method from the type information and the name found in the XML file.
MethodPlan methodPlan = new MethodPlan("Load");
// Construct a call to the 'Load' method to populate the broker record.
methodPlan.Parameters.Add(new InputParameter("brokerId", broker.Symbol));
methodPlan.Parameters.Add(new InputParameter("name", broker.Name));
methodPlan.Parameters.Add(new InputParameter("symbol", broker.Symbol));
// Create a method from the XML data and add it to the transaction.
transactionPlan.Methods.Add(typePlan, methodPlan);
}
// This will check to see if it's time to send the batch. A batch is sent when the 'batchSize' has been
// reached, or if the last record has just been converted into a command.
if (++batchCounter % batchSize == 0 || broker == null)
{
WebTransactionProtocol.Execute(batch);
batch = new Batch();
transactionPlan = batch.Transactions.Add();
assemblyPlan = batch.Assemblies.Add(assemblyName);
typePlan = assemblyPlan.Types.Add(string.Format("{0}.{1}", nameSpaceName, "Broker"));
}
// If the end of file was reached, break out of the loop and exit the application.
if (broker == null)
{
break;
}
}
}
catch (BatchException batchException)
{
foreach (Exception exception in batchException.Exceptions)
{
Console.WriteLine(exception.Message);
}
hasErrors = true;
}
catch (Exception exception)
{
// Show the system error and exit with an error.
Console.WriteLine(exception.Message);
hasErrors = true;
}
// Any errors will cause an abnormal exit.
if (hasErrors)
{
return(1);
}
// Write a status message when a the file is loaded successfully.
Console.WriteLine(String.Format("{0} Data: Brokers, Loaded", DateTime.Now.ToString("u")));
// If we reached here, the file was imported without issue.
return(0);
}
/// <summary>
/// Begins the task of applying the changes in the form to the data model.
/// </summary>
private void PostThread(object parameter)
{
// Extract the parameters from the threads parameter.
object[] parameters = (object[])parameter;
bool exitDialog = (bool)parameters[0];
SourceOrder sourceOrder = (SourceOrder)parameters[1];
// This batch will collect the information needed to execute a complex transaction on the server. The first part of
// the batch sets up the transaction: the assembly where the types and methods are found. It also sets up a
// transaction for a complex operation. In this case, the transaction is not that complex, just a single method to be
// executed.
Batch batch = new Batch();
AssemblyPlan assembly = batch.Assemblies.Add("Trading Service");
TypePlan type = assembly.Types.Add("MarkThree.Guardian.Trading.SourceOrder");
TransactionPlan transaction = batch.Transactions.Add();
MethodPlan methodPlan = transaction.Methods.Add(type, "Insert");
// These are the parameters used to create a Source Order. The Working Order will be created implicitly.
methodPlan.Parameters.Add(new InputParameter("blotterId", this.blotter.BlotterId));
methodPlan.Parameters.Add(new InputParameter("isBrokerMatch", sourceOrder.IsBrokerMatch));
methodPlan.Parameters.Add(new InputParameter("isHedgeMatch", sourceOrder.IsHedgeMatch));
methodPlan.Parameters.Add(new InputParameter("isInstitutionMatch", sourceOrder.IsInstitutionMatch));
methodPlan.Parameters.Add(new InputParameter("submissionTypeCode", SubmissionType.UsePeferences));
if (sourceOrder.MaximumVolatility != DBNull.Value)
{
methodPlan.Parameters.Add(new InputParameter("maximumVolatility", sourceOrder.MaximumVolatility));
}
if (sourceOrder.NewsFreeTime != DBNull.Value)
{
methodPlan.Parameters.Add(new InputParameter("newsFreeTime", sourceOrder.NewsFreeTime));
}
methodPlan.Parameters.Add(new InputParameter("orderedQuantity", sourceOrder.Quantity));
methodPlan.Parameters.Add(new InputParameter("orderTypeCode", sourceOrder.OrderTypeCode));
methodPlan.Parameters.Add(new InputParameter("priceTypeCode", PriceType.Market));
methodPlan.Parameters.Add(new InputParameter("securityId", sourceOrder.SecurityId));
methodPlan.Parameters.Add(new InputParameter("settlementId", sourceOrder.SettlementId));
if (sourceOrder.StartTime != DBNull.Value)
{
methodPlan.Parameters.Add(new InputParameter("startTime", sourceOrder.StartTime));
}
if (sourceOrder.StopTime != DBNull.Value)
{
methodPlan.Parameters.Add(new InputParameter("stopTime", sourceOrder.StopTime));
}
methodPlan.Parameters.Add(new InputParameter("timeInForceCode", TimeInForce.Day));
// This will execute the command on the server and return any exceptions.
BatchException batchException = null;
try
{
// Execute the batch.
ClientMarketData.Execute(batch);
}
catch (BatchException exception)
{
// Any exceptions will be captured here and passed on to the foreground.
batchException = exception;
}
// Call the foreground thread with the results of executing the batch on the server. Also, in some cases the dialog is
// going to be dismissed when the server data model has finished updating successfully. Pass on the flag to the
// foreground that will indicate whether the form is closed once the results are processed.
BeginInvoke(this.postEndDelegate, new object[] { exitDialog, batchException });
}
private void DeclineTrade(object parameter)
{
bool isBatchValid = true;
Batch batch = new Batch();
MethodPlan method = null;
try
{
// Lock the tables.
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
ClientMarketData.MatchLock.AcquireReaderLock(ClientTimeout.LockWait);
ClientMarketData.OrderTypeLock.AcquireReaderLock(ClientTimeout.LockWait);
ClientMarketData.SecurityLock.AcquireReaderLock(ClientTimeout.LockWait);
ClientMarketData.WorkingOrderLock.AcquireReaderLock(ClientTimeout.LockWait);
// Find the Match record.
ClientMarketData.MatchRow matchRow = ClientMarketData.Match.FindByMatchId(this.matchId);
AssemblyPlan assembly = batch.Assemblies.Add("Core Service");
TypePlan type = assembly.Types.Add("MarkThree.Guardian.Core.Negotiation");
TransactionPlan transaction = batch.Transactions.Add();
method = transaction.Methods.Add(type, "Insert");
method.Parameters.Add(new InputParameter("matchId", matchId));
method.Parameters.Add(new InputParameter("quantity", 0.0m));
method.Parameters.Add(new InputParameter("statusCode", Status.Declined));
}
catch (Exception exception)
{
// Write the error and stack trace out to the debug listener
EventLog.Error("{0}, {1}", exception.Message, exception.StackTrace);
// This indicates that the batch shouldn't be executed.
isBatchValid = false;
}
finally
{
// Release the locks.
if (ClientMarketData.MatchLock.IsReaderLockHeld)
{
ClientMarketData.MatchLock.ReleaseReaderLock();
}
if (ClientMarketData.OrderTypeLock.IsReaderLockHeld)
{
ClientMarketData.OrderTypeLock.ReleaseReaderLock();
}
if (ClientMarketData.SecurityLock.IsReaderLockHeld)
{
ClientMarketData.SecurityLock.ReleaseReaderLock();
}
if (ClientMarketData.WorkingOrderLock.IsReaderLockHeld)
{
ClientMarketData.WorkingOrderLock.ReleaseReaderLock();
}
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
}
// If the command batch was built successfully, then execute it. If any part of it should fail, cancel the edit and
// display the server errors.
if (isBatchValid)
{
try
{
// Call the web server to rename the object on the database. Note that this method must be called when there
// are no locks to prevent deadlocking. That is why it appears in it's own 'try/catch' block.
ClientMarketData.Execute(batch);
this.negotiationId = (int)method.Parameters.Return.Value;
}
catch (BatchException batchException)
{
// Display each error in the batch.
foreach (Exception exception in batchException.Exceptions)
{
Invoke(new MessageDelegate(ShowMessage), exception.Message, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
}
/// <summary>
/// Moves a child object from one parent to another.
/// </summary>
/// <param name="parameter">An array consiting of the target parent, the current parent and the child to be moved.</param>
private void MoveChild(object parameter)
{
// Extract the objects selected by the drag-and-drop operation.
object[] parameters = (object[])parameter;
MarkThree.Guardian.Object toObject = (MarkThree.Guardian.Object)parameters[0];
MarkThree.Guardian.Object fromObject = (MarkThree.Guardian.Object)parameters[1];
MarkThree.Guardian.Object childObject = (MarkThree.Guardian.Object)parameters[2];
try
{
// Lock the tables needed for this operation.
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
ClientMarketData.ObjectLock.AcquireReaderLock(CommonTimeout.LockWait);
ClientMarketData.ObjectTreeLock.AcquireReaderLock(CommonTimeout.LockWait);
// It's critical that circular references aren't created, either by accident or design. First, find the object
// record associated with the destination node.
ClientMarketData.ObjectRow parentRow = ClientMarketData.Object.FindByObjectId(toObject.ObjectId);
if (parentRow == null)
{
throw new Exception("This object has been deleted");
}
// This is the object that is being dragged. Find the row
ClientMarketData.ObjectRow childRow = ClientMarketData.Object.FindByObjectId(childObject.ObjectId);
if (childRow == null)
{
throw new Exception("This object has been deleted");
}
// This will remove the possibility of a circular relationship.
if (MarkThree.Guardian.Relationship.IsChildObject(childRow, parentRow))
{
Invoke(new MessageDelegate(ShowMessage), Properties.Resources.CircularReferenceError, MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}
catch (Exception exception)
{
// Write the error and stack trace out to the debug listener
EventLog.Error("{0}, {1}", exception.Message, exception.StackTrace);
}
finally
{
// Release table locks.
if (ClientMarketData.ObjectLock.IsReaderLockHeld)
{
ClientMarketData.ObjectLock.ReleaseReaderLock();
}
if (ClientMarketData.ObjectTreeLock.IsReaderLockHeld)
{
ClientMarketData.ObjectTreeLock.ReleaseReaderLock();
}
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
}
// Any commands created below will be constructed in this object and sent to the server for execution.
bool isBatchValid = true;
Batch batch = new Batch();
// If we made it here, the drag-and-drop is interpreted as a command to move a child from one parent to another.
try
{
// Lock the tables needed for this operation.
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
ClientMarketData.ObjectLock.AcquireReaderLock(CommonTimeout.LockWait);
ClientMarketData.ObjectTreeLock.AcquireReaderLock(CommonTimeout.LockWait);
// Extract the primary identifiers from the user interface nodes.
// This is the object that is being dragged. Find the row
ClientMarketData.ObjectRow childRow = ClientMarketData.Object.FindByObjectId(childObject.ObjectId);
if (childRow == null)
{
throw new Exception("This object has been deleted");
}
// Find the object in the data model and make sure it still exists.
ClientMarketData.ObjectTreeRow objectTreeRow = null;
foreach (ClientMarketData.ObjectTreeRow innerObjectTreeRow in childRow.GetObjectTreeRowsByObjectObjectTreeChildId())
{
if (innerObjectTreeRow.ParentId == fromObject.ObjectId)
{
objectTreeRow = innerObjectTreeRow;
}
}
if (objectTreeRow == null)
{
throw new Exception("This relationship has been deleted by someone else.");
}
// Moving a child object from one parent to another must be accomplished as a transaction. Otherwise, an
// orhpan object will be created if the operation fails midway through.
TransactionPlan transaction = batch.Transactions.Add();
AssemblyPlan assembly = batch.Assemblies.Add("Core Service");
TypePlan type = assembly.Types.Add("MarkThree.Guardian.Core.ObjectTree");
// Construct a command delete the old parent relation.
MethodPlan deleteObjectTree = transaction.Methods.Add(type, "Update");
deleteObjectTree.Parameters.Add(new InputParameter("objectTreeId", objectTreeRow.ObjectTreeId));
deleteObjectTree.Parameters.Add(new InputParameter("parentId", toObject.ObjectId));
deleteObjectTree.Parameters.Add(new InputParameter("childId", childObject.ObjectId));
deleteObjectTree.Parameters.Add(new InputParameter("rowVersion", objectTreeRow.RowVersion));
}
catch (Exception exception)
{
// Write the error and stack trace out to the debug listener
EventLog.Error("{0}, {1}", exception.Message, exception.StackTrace);
// This indicates that the batch shouldn't be executed.
isBatchValid = false;
}
finally
{
// Release table locks.
if (ClientMarketData.ObjectLock.IsReaderLockHeld)
{
ClientMarketData.ObjectLock.ReleaseReaderLock();
}
if (ClientMarketData.ObjectTreeLock.IsReaderLockHeld)
{
ClientMarketData.ObjectTreeLock.ReleaseReaderLock();
}
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
}
// If the command batch was built successfully, then execute it.
if (isBatchValid)
{
try
{
// Call the web server to rename the object on the database. Note that this method must be called when there are
// no locks to prevent deadlocking. That is why it appears in it's own 'try/catch' block.
ClientMarketData.Execute(batch);
}
catch (BatchException batchException)
{
// Display each error in the batch.
foreach (Exception exception in batchException.Exceptions)
{
MessageBox.Show(exception.Message, "Guardian Error");
}
}
}
}
/// <summary>
/// Rename the object.
/// </summary>
/// <param name="parameters">The object to be renamed.</param>
private void RenameObject(object parameter)
{
// Extract the thread arguments
object[] parameters = (object[])parameter;
TreeNode treeNode = (TreeNode)parameters[0];
string name = (string)parameters[1];
// Extract the object that is associated with the TreeView node.
MarkThree.Guardian.Object commonObject = (MarkThree.Guardian.Object)treeNode.Tag;
// This command batch is constructed below and sent to the server for execution. Note that the batch is designed to
// live beyond the block of code that locks the data model. This is to prevent the data model from being locked while
// a relatively long server database operation is underway.
bool isBatchValid = true;
Batch batch = new Batch();
try
{
// Lock the table
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
ClientMarketData.ObjectLock.AcquireReaderLock(CommonTimeout.LockWait);
// Find the object in the data model and make sure it still exists.
ClientMarketData.ObjectRow objectRow = ClientMarketData.Object.FindByObjectId(commonObject.ObjectId);
if (objectRow == null)
{
throw new Exception("This object has been deleted.");
}
// Construct a command to rename the object.
AssemblyPlan assembly = batch.Assemblies.Add("Core Service");
TypePlan type = assembly.Types.Add("MarkThree.Guardian.Core.Object");
TransactionPlan transaction = batch.Transactions.Add();
MethodPlan method = transaction.Methods.Add(type, "Update");
method.Parameters.Add(new InputParameter("rowVersion", objectRow.RowVersion));
method.Parameters.Add(new InputParameter("objectId", objectRow.ObjectId));
method.Parameters.Add(new InputParameter("name", name));
}
catch (Exception exception)
{
// This serves as an indication that the batch couldn't be constructed.
isBatchValid = false;
// Write the error and stack trace out to the debug listener
EventLog.Error("{0}, {1}", exception.Message, exception.StackTrace);
}
finally
{
// Release table locks.
if (ClientMarketData.ObjectLock.IsReaderLockHeld)
{
ClientMarketData.ObjectLock.ReleaseReaderLock();
}
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
}
// If the command batch was built successfully, then execute it. If any part of it should fail, cancel the edit and
// display the server errors.
if (isBatchValid)
{
try
{
// Call the web server to rename the object on the database. Note that this method must be called when there
// are no locks to prevent deadlocking. That is why it appears in it's own 'try/catch' block.
ClientMarketData.Execute(batch);
}
catch (BatchException batchException)
{
// Display each error in the batch.
foreach (Exception exception in batchException.Exceptions)
{
Invoke(new MessageDelegate(ShowMessage), exception.Message, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
}
}
/// <summary>
/// Execute a command batch and synchronizes the client data model with the newer records from the server.
/// </summary>
public static void Execute(Batch batch)
{
// This 'try' block will insure that the mutual exclusion locks are released.
try
{
// Make sure only one thread at a time tries to refresh the data model.
ClientMarketData.clientDataMutex.WaitOne();
// Switching credentials without exiting the application will force the data model to be cleared and the row
// counting to begin at zero again. That is, it effectively resets the client data model.
if (ClientMarketData.isReset)
{
ClientMarketData.isReset = false;
ClientMarketData.rowVersion = 0;
ClientMarketData.Clear();
}
// IMPORTANT CONCEPT: The rowVersion keeps track of the state of the client in-memory database. The server
// returns a value for us to use on the next cycle.
long rowVersion = ClientMarketData.rowVersion;
// IMPORTANT CONCEPT: Executing the 'GetClientMarketData' with a rowVersion returns to the client a DataSet
// with only records that are the same age or younger than the rowVersion. This reduces the traffic on the
// network to include only the essential records. We are also merging it with the current ClientMarketData,
// which adds new records and records that were deleted by the server.
AssemblyPlan assembly = batch.Assemblies.Add("Server Market Data");
TypePlan type = assembly.Types.Add("MarkThree.Guardian.Server.ServerMarketData");
TransactionPlan transaction = batch.Transactions.Add();
MethodPlan method = transaction.Methods.Add(type, "Reconcile");
Parameter rowVersionParameter = method.Parameters.Add(new InputParameter("rowVersion", rowVersion));
// Execute the the command to get the incremental changes from the server.
WebTransactionProtocol.Execute(batch);
// This is the updated data model information returned from the server.
ArrayList reconciledData = (ArrayList)method.Parameters.Return.Value;
// Optimization: Don't merge the results if there's nothing to merge.
if (reconciledData != null)
{
// IMPORTANT CONCEPT: Since the results will still be on the server if the client misses a refresh
// cycle, we take the attitude that thBzis update process doesn't have to wait for locks. That is, if we
// can't get all the tables locked quickly, we'll just wait until the next refresh period to get the
// results. This effectively prevents deadlocking on the client. Make sure all the tables are locked
// before populating them.
foreach (TableLock tableLock in ClientMarketData.TableLocks)
{
tableLock.AcquireWriterLock(ClientTimeout.LockWait);
}
// IMPORTANT CONCEPT: This broadcast can be used to set up conditions for the data event handlers. Often,
// optimizing algorithms will be used to consolidate the results of a merge. This will allow the event
// driven logic to clear previous results and set up initial states for handling the bulk update of data.
ClientMarketData.OnBeginMerge(typeof(ClientMarketData));
// IMPORANT CONCEPT: Once all the write locks have been obtained, we can merge the results. This will
// trigger the events associated with the tables for updated and deleted rows. Note that this 'Merge'
// method has different characteristics than the original one provided by Microsoft (that is, this one
// works).
ClientMarketData.rowVersion = MarketData.Merge(reconciledData);
// IMPORTANT CONCEPT: When the merge is complete, this will broadcast an event which allows optimization code
// to consolidate the results, examine the changed values and update reports based on the changed data.
ClientMarketData.OnEndMerge(typeof(ClientMarketData));
}
}
finally
{
// No matter what happens above, we need to release the locks acquired above.
foreach (TableLock tableLock in ClientMarketData.TableLocks)
{
if (tableLock.IsWriterLockHeld)
{
tableLock.ReleaseWriterLock();
}
}
// Other threads can now request a refresh of the data model.
ClientMarketData.clientDataMutex.ReleaseMutex();
}
// Throw a specialized exception if the server returned any errors in the Batch structure.
if (batch.HasExceptions)
{
throw new BatchException(batch);
}
}
/// <summary>
/// Load the XML script.
/// </summary>
public void Load()
{
// This flag is set when an error occurs anywhere in the processing of the XML file.
this.HasErrors = false;
// Read the XML data from the specified file.
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load(this.FileName);
// Sending records to the server is state driven. This loop will collect a batch of commands until a new table is
// found in the XML stream, or until the limit of a batch is reached, or until the end of the file is read. The idea
// is to allow several tables of data to exist in a single file.
XmlNode rootNode = xmlDocument.DocumentElement;
// The script name is stored in the root node. The name is used in status and debugging messages.
this.ScriptName = rootNode.Attributes["name"] == null ? "Unnamed Batch" : rootNode.Attributes["name"].Value;
// If the user wants to specify a new URL and certificate, then prompt for the connection info the next time a
// WebTransactionProtocol sends off a batch.
if (this.ForceLogin)
{
WebTransactionProtocol.IsUrlPrompted = true;
WebTransactionProtocol.IsCredentialPrompted = true;
}
// Create a batch to hold the transactions.
this.batch = new Batch();
// As methods are parsed, they're added to this transaction. The organization of the transaction is determined by the
// input file. Explicit transaction will create their own transactions when they appear in the file. Implicit
// transactions are created when an unaffiliated method element is parsed out of the XML file.
this.transaction = null;
// The batch is sent when this flag is set.
bool sendBatch = false;
// Cycle through all of the children of the root node. The methods in this file will either be affiliated with an
// explicit transaction, or be unaffiliated. The 'free' methods will be packed together in an implicit transaction and
// sent to the server when the transaction reaches a predetermined size. This will search the file for both kinds of
// records.
foreach (XmlNode xmlNode in rootNode)
{
// A 'transaction' element is a command for an explicit transaction. A 'method' element declares a method for an
// implicit (internally created) transaction.
switch (xmlNode.Name)
{
case "transaction":
// Parse the methods out of the node and send the batch off to the server for execution.
ParseTransaction(xmlNode);
break;
case "send":
// Transactions can be grouped together in a file. They are not sent to the Web Transaction handler until
// either the end of the file, or an explicit 'send' node.
sendBatch = true;;
break;
case "method":
// For an implicit method execution, a transaction will be created automatically. When the batch is sent, this
// value will be cleared again.
if (this.transaction == null)
{
this.transaction = this.batch.Transactions.Add();
}
// Parse the method out of the XML node.
ParseMethod(xmlNode);
// If the size of the transaction has reached the predetermined limit, then the batch can be sent.
if (this.transaction.Methods.Count == this.TransactionSize)
{
sendBatch = true;
}
break;
}
// If the parser has determined that the batch is large enough, then it is sent to the server.
if (sendBatch)
{
// Send the batch to the server.
SendBatch(batch);
// Prepare a brand new batch for the records remaining to be parsed.
this.batch = new Batch();
this.transaction = null;
sendBatch = false;
}
}
// If a transaction has been initialized but not sent, then send the batch.
if (batch.Transactions.Count != 0)
{
SendBatch(batch);
}
// Wait here until all the IO requests have completed.
this.requestCompleted.WaitOne();
}
/// <summary>
/// Read, parse and load the stylesheet into the middle tier.
/// </summary>
public void Load()
{
// If this flag is set during the processing of the file, the program will exit with an error code.
this.HasErrors = false;
// If the user wants to specify a new URL and certificate, then prompt for the connection info the next time a
// WebTransactionProtocol sends off a batch.
if (this.ForceLogin)
{
WebTransactionProtocol.IsUrlPrompted = true;
WebTransactionProtocol.IsCredentialPrompted = true;
}
// Load up an XML document with the contents of the file specified on the command line.
XmlDocument stylesheet = new XmlDocument();
stylesheet.Load(this.FileName);
// The XML document has several nodes that need to be read -- and then removed -- that contain attributes of the
// stylesheet. These nodes can be found easily using the XSL Path functions which need a namespace manager to sort out
// the tag prefixes.
XmlNamespaceManager namespaceManager = new XmlNamespaceManager(stylesheet.NameTable);
namespaceManager.AddNamespace("xsl", "http://www.w3.org/1999/XSL/Transform");
namespaceManager.AddNamespace("mts", "urn:schemas-markthreesoftware-com:stylesheet");
// The spreadhseet source has several nodes which contain information about how the data in the XML document should be
// loaded into the server, such as the stylesheet identifier, the name and the stylesheet style. They are found at
// this node. After these information nodes have been read, they are removed from the stylesheet source.
XmlNode stylesheetNode = stylesheet.SelectSingleNode("xsl:stylesheet", namespaceManager);
if (stylesheetNode == null)
{
throw new Exception("Syntax Error: missing stylesheet declaration.");
}
// Find the StylesheetId node.
XmlNode StylesheetIdNode = stylesheetNode.SelectSingleNode("mts:stylesheetId", namespaceManager);
if (StylesheetIdNode == null)
{
throw new Exception("Syntax Error: missing StylesheetId declaration.");
}
// Find the StylesheetStyle node.
XmlNode stylesheetTypeCodeNode = stylesheetNode.SelectSingleNode("mts:stylesheetTypeCode", namespaceManager);
if (stylesheetTypeCodeNode == null)
{
throw new Exception("Syntax Error: missing StylesheetStyle declaration.");
}
// Find the name node.
XmlNode nameNode = stylesheetNode.SelectSingleNode("mts:name", namespaceManager);
if (nameNode == null)
{
throw new Exception("Syntax Error: missing name declaration.");
}
// Extract the data from the XML nodes.
this.StylesheetId = StylesheetIdNode.InnerText;
this.StylesheetTypeCode = stylesheetTypeCodeNode.InnerText;
this.StylesheetName = nameNode.InnerText;
// Remove the stylesheet nodes from the XSL spreadsheet before loading it into the server.
stylesheetNode.RemoveChild(StylesheetIdNode);
stylesheetNode.RemoveChild(stylesheetTypeCodeNode);
stylesheetNode.RemoveChild(nameNode);
// Create a command to load the stylesheet from the data loaded from the file.
Batch batch = new Batch();
TransactionPlan transaction = batch.Transactions.Add();
AssemblyPlan assembly = batch.Assemblies.Add(this.Assembly);
TypePlan type = assembly.Types.Add(this.Type);
MethodPlan method = transaction.Methods.Add(type, this.Method);
method.Parameters.Add(new InputParameter("stylesheetId", this.StylesheetId));
method.Parameters.Add(new InputParameter("stylesheetTypeCode", this.StylesheetTypeCode));
method.Parameters.Add(new InputParameter("name", this.StylesheetName));
method.Parameters.Add(new InputParameter("text", stylesheet.InnerXml));
try
{
// Create a new web client that will serve as the connection point to the server and call the web services to execute
// the command batch.
WebTransactionProtocol.Execute(batch);
}
catch (BatchException)
{
foreach (MethodPlan batchMethod in transaction.Methods)
{
foreach (Exception exception in batchMethod.Exceptions)
{
Console.WriteLine(String.Format("{0}: {1}", method.Parameters["StylesheetId"].Value, exception.Message));
}
}
this.HasErrors = true;
}
}
/// <summary>
/// Marshals the data needed refuse a chance to negotiate a trade.
/// </summary>
/// <param name="parameter">The thread initialization data.</param>
private void DeclineNegotiationThread(object parameter)
{
// Extract the thread parameters
int matchId = (int)parameter;
// This batch, if succesfully constructed, will be sent to the server to deline the negotiation.
Batch batch = new Batch();
try
{
// Lock the tables.
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
ClientMarketData.MatchLock.AcquireReaderLock(ClientTimeout.LockWait);
ClientMarketData.OrderTypeLock.AcquireReaderLock(ClientTimeout.LockWait);
ClientMarketData.SecurityLock.AcquireReaderLock(ClientTimeout.LockWait);
ClientMarketData.WorkingOrderLock.AcquireReaderLock(ClientTimeout.LockWait);
// Find the Match record.
ClientMarketData.MatchRow matchRow = ClientMarketData.Match.FindByMatchId(matchId);
// Construct a command decline the negotiation.
AssemblyPlan assembly = batch.Assemblies.Add("Core Service");
TypePlan type = assembly.Types.Add("MarkThree.Guardian.Core.Negotiation");
TransactionPlan transaction = batch.Transactions.Add();
MethodPlan method = transaction.Methods.Add(type, "Insert");
method.Parameters.Add(new InputParameter("matchId", matchId));
method.Parameters.Add(new InputParameter("quantity", 0.0m));
method.Parameters.Add(new InputParameter("statusCode", Status.Declined));
}
catch (Exception exception)
{
// Write the error and stack trace out to the debug listener
EventLog.Error("{0}, {1}", exception.Message, exception.StackTrace);
// This indicates that the batch shouldn't be executed.
batch = null;
}
finally
{
// Release the locks.
if (ClientMarketData.MatchLock.IsReaderLockHeld)
{
ClientMarketData.MatchLock.ReleaseReaderLock();
}
if (ClientMarketData.OrderTypeLock.IsReaderLockHeld)
{
ClientMarketData.OrderTypeLock.ReleaseReaderLock();
}
if (ClientMarketData.SecurityLock.IsReaderLockHeld)
{
ClientMarketData.SecurityLock.ReleaseReaderLock();
}
if (ClientMarketData.WorkingOrderLock.IsReaderLockHeld)
{
ClientMarketData.WorkingOrderLock.ReleaseReaderLock();
}
System.Diagnostics.Debug.Assert(!ClientMarketData.IsLocked);
}
// If the command batch was built successfully, then execute it.
if (batch != null)
{
try
{
// Call the web server to rename the object on the database. Note that this method must be called when there
// are no locks to prevent deadlocking. That is why it appears in it's own 'try/catch' block.
ClientMarketData.Execute(batch);
}
catch (BatchException batchException)
{
// Write any server generated error messages to the event log.
foreach (Exception exception in batchException.Exceptions)
{
EventLog.Error("{0}, {1}", exception.Message, exception.StackTrace);
}
}
}
}
