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// use previous bet... newBet = uiBet; } Bet bet = new Bet(newBet, uiCredits, minBet, maxBet); uiBet = bet.Amount; uiCredits = bet.Credits; if (bet.Message.Equals("")) Console.WriteLine("Betting {0}...", uiBet); else Console.WriteLine(bet.Message + '\u0007'); // ring bell Hand dealHand = machine.Deal(); // deal Console.WriteLine("{0}", dealHand); Console.Write("Enter card numbers (1 to 5) to hold: "); string holdCards = Console.ReadLine(); Hand drawHand = machine.Draw(dealHand.ToString(), holdCards, uiBet); int uiWin = drawHand.Score * uiBet; uiCredits += uiWin; string uiMsg = drawHand.ToString() + " - " + drawHand.Title + " " + "(Score=" + drawHand.Score + ", " + "Bet=" + uiBet + ", " + "Win=" + uiWin + ")"; Console.WriteLine(uiMsg); Console.WriteLine(machine.Stats); } private private private private private Machine machine; int minBet; int maxBet; int uiCredits; int uiBet;
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} // end Class ConPok // action starts here... public class Go { public static void Main() { ConPok cp = new ConPok(); } }
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A makefile is provided in appendix B, which will build the console, and other versions, of the poker machine. Alternatively, to build ConPok alone, issue the following compiler command:
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csc /r:poker.dll conpok.cs
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CONPOK: 3-TIER CLIENT/SERVER POKER
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Figure 4.17 shows ConPok in play.
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Playing ConPok
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In this chapter, we coded and tested the data layer for the poker machine. In doing so, we examined the DataSet which is the centerpiece of ADO.NET. We learned how to use a DataSet to retrieve and process data from the database and how to persist both schema and data as XML documents. We saw how ADO.NET can operate without a managed provider. We also learned how to perform updates on an underlying database using the DataSet object and how to directly execute SQL UPDATE/INSERT/DELETE statements using the SqlCommand object. We coded the data layer for our case study. In doing so we employed a faulttolerant error handling strategy that records errors while ensuring that the poker machine remains playable even if SQL Server goes down. We used XML and XSLT to create a flexible reporting mechanism so that reports can be read by users, or consumed in XML form by other applications. We finished by building a complete client-server console version of our case study application. In the next chapter we explore .NET s remoting services, which provide us with the infrastructure to build distributed .NET applications. We build a remote version of the poker application and we also lay the necessary groundwork for our discussion of XML Web services in chapter 6.
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Developing remote services
5.1 Introduction to remoting 118 5.2 Implementing server-activated remote objects 123 5.3 Configuring remoting 124 5.4 Implementing client-activated remote objects 127 5.5 Client activation and leasing 130 5.6 Handling remote events 136 5.7 Hosting objects in Internet Information Server 140 5.8 RemPok: a remote poker game 144 5.9 SvcPok: a remote poker game as a Windows service 149 5.10 QuePok: a message queue-based poker game 155 5.11 Summary 163
In this chapter, we examine .NET s remoting infrastructure which supports the activation and use of remote objects across the network. The .NET remoting architecture offers a simple programming model which helps to make remote object invocation and use transparent to the client application. Developers can take advantage of this model to create distributed applications, or to expose application objects to remote clients. .NET remoting can use TCP and HTTP channels to communicate between remote endpoints, and the channel services are pluggable so that alternative custom channels can be implemented. We ll explore both TCP and HTTP options. As usual, to illustrate the discussion, we ll use .NET s remoting services to implement a remote poker machine service. We ll create several versions of this service including one which operates as a Windows service (formerly known as an NT service).
Also, although not strictly part of .NET s remoting services, Microsoft Message Queuing (MSMQ) offers an alternative approach to developing distributed services. Therefore, as a bonus, this chapter includes an MSMQ-based version of our poker service.
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