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The policy server s functionality resides in two key classes. The first class, PolicyServer, is responsible for waiting and listening for connections. When a connection is received, it s handed off to a new instance of the second class, PolicyConnection, which then sends the policy file. This two-part design is common in network programming, and you ll see it again with the messaging server.

Data always has a trend or a paradigm. When you re looking at the data, you might begin to wonder, What if.... To answer this question, you need the business intelligence mechanism. Understanding the basics of BI or data warehouse modeling helps you achieve accurate results. Every industry, organization, enterprise, firm, or even individual has information stored in some format in databases or files somewhere. Sometimes this data will just be read, and sometimes it needs to be modified and provide instant results. In such cases, one significant factor is the size of the data. Databases that yield instant results by adding, editing, or deleting information deal with transactional

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When the PolicyServer class is created, it loads the policy file from the hard drive and stores it in a field, as an array of bytes: public class PolicyServer { private byte[] policy; public PolicyServer(string policyFile) { // Load the policy file. FileStream policyStream = new FileStream(policyFile, FileMode.Open); policy = new byte[policyStream.Length]; policyStream.Read(policy, 0, policy.Length); policyStream.Close(); } ... To start listening, the server application must call PolicyServer.Start(). This creates a TcpListener, which waits for requests. The TcpListener is configured to listen on port 943, because Silverlight reserves this port for policy servers. (As you ll see, when Silverlight applications make policy files requests, they automatically send them to this port.) ... private TcpListener listener; public void Start() { // Create the listener. listener = new TcpListener(IPAddress.Any, 943); // Begin listening. This method returns immediately. listener.Start(); // Wait for a connection. This method returns immediately. // The waiting happens on a separate thread. listener.BeginAcceptTcpClient(OnAcceptTcpClient, null); } ... To accept any pending connections, the policy server calls BeginAcceptTcpClient(). Like all the BeginXxx() methods in .NET, this method returns immediately and starts the real work on a separate thread. This is an important detail for a networking application, because it allows you to handle multiple policy file requests at the same time.

You use reference data to create service requests, such as a product catalog. Reference data must be in a format that is usable by both the service provider and the service consumer and is identified in a way that doesn t change over time, such as a catalog date. Reference data may also be imported into a service. As it is read into a service, it may be processed, reformatted, and indexed. Reference data stored in the service remains immutable. While the syntax and the internal representation of the reference data may be changed to suit the needs of the service, the semantics remain intact and are considered a representation of the same immutable data.

data. Such information needs a quick turnaround from the applications. In such cases, users seek or provide information via the UI or another source, and the result of any subsequent read, publish, edit, or even delete must happen instantly. Transaction results must also be delivered instantly, without any latency. A system that can deliver such instant results usually is based on the model called Online Transaction Processing or just OLTP.

Note Newcomers to network programming often wonder how they can handle more than one simultaneous request, and they sometimes assume that multiple server reports are required. This isn t the case if it were, a small set of applications could quickly exhaust the available ports. Instead, server applications handle multiple requests with the same port. This process is almost completely transparent because the underlying TCP architecture in Windows automatically identifies messages and routes them to the appropriate object in your code. Connections are uniquely identified based on four pieces of information: the IP address and server port, and the IP address and client port.

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