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CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
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Dim body As String = String.Format("Response {0}", DateTime.Now.ToString("ffffff")) Dim header As String = String.Format("HTTP/1.1 200 OK" + ControlChars.NewLine + _ _ "Sequence-Number: {0}" + _ ControlChars.NewLine + _ "Content-Length: {1}" + _ ControlChars.NewLine, _ httpRequest.SequenceNumber, _ body.Length) Dim message As String = String.Format("{0}{1}{2}", header, ControlChars.NewLine, body) Dim bytes As Byte() = Encoding.UTF8.GetBytes(message) Dim stream As New NetworkStream(_socket) stream.Write(bytes, 0, bytes.Length) Dim requestBody As String = Encoding.UTF8.GetString(_httpRequest.Body) FireRequestProcessed(requestBody, _httpRequest.SequenceNumber, _ theProcessingTime, body) End Sub Public Event OnRequestProcessed(ByVal theRequest As String, _ ByVal theSequenceNumber As Integer, ByVal theDuration As Integer, _ ByVal theResponse As String) Public Sub FireRequestProcessed(ByVal theRequest As String, _ ByVal theSequenceNumber As Integer, ByVal theDuration As Integer, _ ByVal theResponse As String) RaiseEvent OnRequestProcessed(theRequest, theSequenceNumber, theDuration, theResponse) End Sub Public Event OnIdle() Public Sub FireIdle() RaiseEvent OnIdle() End Sub End Class When RequestProcessor gets a request to handle, it fires an OnIdle event to let the Coordinator simulate the processing time. The Coordinator uses a random number generator to pause the request thread for an amount of time between one and three seconds. I could have easily put the threadpausing code in RequestProcessor, but since this class is a worker, I opted to keep the thread-related code out of it and put it in the Coordinator where it belongs. The client program allows the user to run up to 200 requests at the same time. The upper limit is not determined as much by the software as it is by the hardware. HttpService uses an internal array of 500 ThreadSemaphores and therefore supports up to 500 concurrent requests, but the size of the array is arbitrary.
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CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
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With this case study, you ve seen how to use events and Coordinator teams to implement a multithreaded service component. I also showed you how to use events and Coordinator teams to create the supporting test programs. By developing HttpService as a component with no coupling to other components, HttpService is independently deployable. Moreover, because its worker classes are also completely decoupled from other classes, the workers are relatively simple to test and easy to reuse.
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Case Study 3: A Distributed Workflow System
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his case study shows how a distributed system might use a messaging service to implement a workflow system in an event-based manner. The system is a hypothetical order system for a car manufacturer I ll call ASAP Cars, which builds vehicles Just In Time (JIT). Instead of using forecasts to determine which models of cars to build, ASAP Cars builds a JIT car when an order is received. In a true JIT manufacturing system, all the main subassemblies reach the manufacturing floor just in time, arriving at the assembly line exactly when they are needed. The JIT approach allows the manufacturer to dispense with large warehouses containing inventories of parts or subassemblies, cutting costs dramatically. JIT manufacturers no longer need huge parking lots to hold cars waiting to be sold. On the other hand, the planning logistics to keep a JIT manufacturing system flowing smoothly are daunting, requiring the coordination of every step in the process. A distributed information system guides the workflow of all the processes. What is most interesting about this case study is not the business logic implemented by the server components, but how those components are connected together and how they communicate using event notifications, channeled through a centralized messaging service. All the code in this chapter is available in the Source Code area of the Apress Web site (www.apress.com). To actually run the code, you ll need to have Microsoft Message Queuing (MSMQ) running somewhere in your environment. For instructions on setting up MSMQ, see the Testing the Complete System section at the end of the chapter.
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