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Figure 12-16. The basic class diagram of HostEmulator The three classes on the right side of the Coordinator team are workers. ConnectionListener is the class that waits for client connections. When a connection arrives, ConnectionListener fires an event to the Coordinator. The Coordinator reacts by creating a new ConnectionProcessor and running it on a separate thread. ConnectionProcessor then waits for incoming data on the given connection. When data arrives, ConnectionProcessor fires an event to the Coordinator, which reacts by creating a RequestProcessor object, which is run on yet another thread. Using a separate thread for each RequestProcessor allows the same connection to continue receiving additional requests while an outstanding request is being processed. RequestProcessor has the task of processing a single request and returning a response. The response must have the same sequence number as the request. The task of parsing the request to extract the sequence number from the HTTP header is given to a small class named HttpRequest, not shown in the class diagram. Figure 12-17 shows the signal diagram of HostEmulator.
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Figure 12-17. The signal diagram of HostEmulator The Coordinator is shown making statically bound calls to the three Worker objects on the right, entailing type coupling between the Coordinator and the workers. To eliminate the coupling, you could have made the Coordinator talk to the workers using event notifications. This approach would have been a bit more complicated, because you would have needed a JIT BuilderBinder, since ConnectionProcessor and RequestProcessor are created on the fly when a client connects and sends a request. Listing 12-25 and Listing 12-26 show the salient portions of FormMain s implementation in C# and VB .NET. Listing 12-25. The Salient Part of the FormMain Implementation (C#) public class FormMain : System.Windows.Forms.Form { int numberOfActiveConnections; int numberOfRequestsReceived; int numberOfRequestsInProgress; CoordinatorIncomingTraffic incomingTraffic;
CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
public FormMain() { //... ListenForRequests(); } void ListenForRequests() { incomingTraffic = new CoordinatorIncomingTraffic(this); incomingTraffic.OnClientConnected += new CoordinatorIncomingTraffic.ClientConnectedHandler(ClientConnected); incomingTraffic.OnRequestStarted += new CoordinatorIncomingTraffic.RequestStartedHandler(RequestStarted); incomingTraffic.OnRequestProcessed += new CoordinatorIncomingTraffic.RequestProcessedHandler(RequestProcessed); incomingTraffic.Run(); } private void ClientConnected() { numberOfActiveConnections++; labelActiveConnections.Text = numberOfActiveConnections.ToString(); } public void RequestStarted() { numberOfRequestsReceived++; labelRequestsReceived.Text = numberOfRequestsReceived.ToString(); numberOfRequestsInProgress++; labelRequestsInProgress.Text = numberOfRequestsInProgress.ToString(); } public void RequestProcessed(string theRequest, theSequenceNumber, int theDuration, string theResponse) { numberOfRequestsInProgress--; labelRequestsInProgress.Text = numberOfRequestsInProgress.ToString(); ListViewItem item = new ListViewItem(DateTime.Now.ToString("HH:mm:ss.fff"));
CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
item.SubItems.Add(theDuration.ToString()); item.SubItems.Add(theSequenceNumber.ToString()); item.SubItems.Add(theResponse); listViewResponses.Items.Add(item); } private void buttonClearList_Click(object sender, System.EventArgs e) { numberOfRequestsReceived = 0; labelRequestsReceived.Text = numberOfRequestsReceived.ToString(); listViewResponses.Items.Clear(); } } Listing 12-26. The Salient Part of the FormMain Implementation (VB .NET) Public Class FormMain Inherits System.Windows.Forms.Form Private _numberOfActiveConnections As Integer Private _numberOfRequestsReceived As Integer Private _numberOfRequestsInProgress As Integer Private _incomingTraffic As CoordinatorIncomingTraffic Public Sub New() MyBase.New() ' ListenForRequests() End Sub Sub ListenForRequests() _incomingTraffic = New CoordinatorIncomingTraffic(Me) AddHandler _incomingTraffic.OnClientConnected, AddressOf ClientConnected AddHandler _incomingTraffic.OnRequestStarted, AddressOf RequestStarted AddHandler _incomingTraffic.OnRequestProcessed, AddressOf RequestProcessed _incomingTraffic.Run() End Sub Private Sub ClientConnected() _numberOfActiveConnections += 1 LabelActiveConnections.Text = _numberOfActiveConnections.ToString() End Sub
CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
Public Sub RequestStarted() _numberOfRequestsReceived += 1 LabelRequestsReceived.Text = _numberOfRequestsReceived.ToString() _numberOfRequestsInProgress += 1 LabelRequestsInProgress.Text = _numberOfRequestsInProgress.ToString() End Sub Public Sub RequestProcessed(ByVal theRequest As String, _ ByVal theSequenceNumber As Integer, _ ByVal theDuration As Integer, ByVal theResponse As String) _numberOfRequestsInProgress -= 1 LabelRequestsInProgress.Text = _numberOfRequestsInProgress.ToString() Dim item As New ListViewItem(DateTime.Now.ToString("HH:mm:ss.fff")) item.SubItems.Add(theDuration.ToString()) item.SubItems.Add(theSequenceNumber.ToString()) item.SubItems.Add(theResponse) ListViewResponses.Items.Add(item) End Sub Private Sub ButtonClearList_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles ButtonClearList.Click _numberOfRequestsReceived = 0 LabelRequestsReceived.Text = numberOfRequestsReceived.ToString() ListViewResponses.Items.Clear() End Sub End Class Listing 12-27 and Listing 12-28 show C# and VB .NET implementations of CoordinatorIncomingTraffic, which is the key class in the system. It ties everything together and handles all the threading logic. Listing 12-27. The Implementation of CoordinatorIncomingTraffic (C#) public class CoordinatorIncomingTraffic { Control uiControl; // used for thread synchronization with events ConnectionListener listener; int basicProcessingTime; // in ms int processingTime; // in ms Random random = new Random(); // used to change the processing time public CoordinatorIncomingTraffic(Control theUiControl) { uiControl = theUiControl; basicProcessingTime = 2000; // 2 secs
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