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public void init(javaxservletServletConfig config) throws javaxservletServletException { _buffer = ""; _callCount = 0; } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws javaxservletServletException, javaioIOException { ServletInputStream input = requestgetInputStream(); byte[] bytearray = new byte[ requestgetContentLength()]; inputread(bytearray); _buffer += new String(bytearray)toString(); _callCount ++; } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = responsegetWriter(); outprintln("Content (" + _buffer + ") Call Count (" + _callCount + ")(" + CalendargetInstance()getTime() + ")"); } EBVN } Compared to the ClientCommunicator code, the ServerCommunicator is relatively simple, but that is due only to the nature of the global status resource implementation and the example in particular The server-side implementation of the ServerCommunicator is a minimal solution.

The two composite validators provided in the Validation Application Block are AndCompositeValidator and OrCompositeValidator, which correspond to the AND and OR logical operators. Their use is identical, but they cannot be used directly by attributebased validation. Only configuration and direct validation are supported. The AndCompositeValidator and OrCompositeValidator classes both have a public constructor that takes one or more validator classes as parameters. Figure 12-14 shows the AndCompositeValidator class diagram.

Figure 4-4. The squares overlap on both axes, so we have a collision. The collision occurs on the y axis, which has the smallest amount of overlap. What will the SAT have to say about this if(the squares overlap on the x axis) //They do { //There might be a collision! Let's check: if(the squares overlap on the y axis) //They do { //The squares overlap in both axes, so //there's definitely a collision. The collision is occurring on //the axis with the smallest amount of overlap }

else { //There's no overlap on the y axis, so there's no collision } } else { //There's no overlap on the x axis, so there's no collision } Not only does it detect the collision, but it also knows that the collision is happening on the y axis, which is the axis with the smallest amount of overlap. This, in a nutshell, is the SAT.

Figure 12-14. AndCompositeValidator class diagram When using attribute-based validation, there is not a corresponding AndCompositeValidator or OrCompositeValidator attribute class. Instead, you will find a class called ValidatorCompositionAttribute. This class has one constructor that takes the enum type of CompositionType (And or Or). By simply decorating a class s member with this, all other validators will use the ValidatorCompositionAttribute class to determine the final outcome of pass or fail. Listing 12-6 shows an example of using ValidatorCompositionAttribute.

As you can see in Figure 8-7, to implement the round trip, the servlet saves state in a data member (_buffer) and records the number of times the state has been modified (_callCount) The method init is called by the HTTP server and initializes the data members The method doPost processes the HTTP POST request and is responsible for the writing stream implementation From the perspective of the two-communication stream mechanism, the method doPost is called by the ClientCommunicatorsend method The data buffer that is sent to the server is read by using the method requestgetInputStream It is important to read the buffer as a stream of bytes because anything could be sent The method doGet processes the HTTP GET request and is responsible for the reading stream implementation.

Before continuing, you need to be aware of a fundamental problem of the SAT system that could give you unexpected results if your game objects move too far in one frame If objects are moving very quickly, the axis with the smallest amount of overlap might not be the one on which the collision is occurring For example, look at Figure 4-4 and imagine that the upper square is moving at a high velocity, from the right side of the stage to the left, and that it has collided with the lower square from the right Imagine that it was moving so fast that it managed to penetrate more than halfway into the lower square Our eyes would tell us that the collision is happening on the x axis, which is correct.

Listing 12-6. Using the ValidatorCompositionAttribute Class public class MyClass { private string m_MyValue; [ValidatorComposite(CompositionType.And)] [StringLengthValidator(100)] [NotNullValidator] public string MyValue { get { return m_MyValue; } set { m_MyValue = value; } } }