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It is possible to define multiple rules at one time. This grouping of rules is defined as a ruleset. For one or more handlers to be applied to a class s members, all of the rules within a ruleset must return true. A named policy may contain only one ruleset; hence, if you want to create an or condition, you will need to create two named policies with the different matching rules but the same handlers.

Another problem is that some browsers will cache the results of the XMLHttpRequest. This is an age-old problem because caching can result in unpredictable behavior, and caching still happens even if the Ajax HTML page is reloaded.

Figure 4-39. The collision code treats the circle like a square when it s in a rectangle-versusrectangle region. When the circle is in a circle-versus-particle region, it completely ignores the square shape and just checks for a collision with the square s closest corner point, as shown in Figure 4-40. This is the same circle-versus-particle collision strategy we looked at in 3.

Figure 4-40. The circle checks for a collision with the corner point and ignores the square completely. Once you understand this, the logic behind selecting the correct collision strategy almost writes itself. But to help you get started, look at CircleVsRectangle in the source files, which implements this system, as shown in Figure 4-41. That s right, my holiday is over!

Creating a custom rule involves implementing the IMatchingRule interface. The IMatchingRule interface contains one method called Matches, which takes an instance of System.Reflection. MethodBase as a parameter and returns a Boolean value. The MethodBase parameter is the class s member that must be checked in order to determine if the specified rule matches. The Boolean value should return true only if the rule is satisfied. An example of an IMatchingRule implementation is shown in Listing 13-3.

The Factory pattern implementation that was used to abstract the instantiation of XMLHttpRequest was a good first step. Using an asynchronous request is a good second step, as it improves the Ajax experience, but other problems remain, such as user feedback and how to use security that falls in the context of same origin policy.

Figure 4-41. Collision detection between a circle and a rectangle The following is the section of code from the CircleVsRectangle application class that finds the region in which the circle resides. (_r1 is the rectangle, and _c1 is the circle.) It compares the circle s position to the rectangle s position and size, and figures out which of the eight regions it currently occupies. //Is the circle above the rectangle's top edge if(_c1.yPos < _r1.yPos - _r1.height * 0.5) { //If it is, we need to check whether it's in the //top left, top center or top right

Listing 13-3. Creating a Custom Rule [ConfigurationElementType(typeof(CustomMatchingRuleData))] public class MyTimeOfDayRule : IMatchingRule { private TimeSpan m_BeginTimeSpan; private TimeSpan m_EndTimeSpan; // time span values should be in hh:mm:ss or hh:mm:ss.ff // hh = hours, mm = minutes, ss = seconds, ff = fractions of a second public MyTimeOfDayRule(NameValueCollection configValues) { m_BeginTimeSpan = TimeSpan.Parse(configValues["BeginTimeSpan"]); m_EndTimeSpan = TimeSpan.Parse(configValues["EndTimeSpan"]); } //ignore MethodBase parameter public bool Matches(MethodBase member) { TimeSpan currentTimeOfDay = DateTime.TimeOfDay; return (currentTimeOfDay >= m_BeginTimeSpan && currentTimeOfDay <= m_EndTimeSpan); } } As shown in Listing 13-3, unlike the matching rules provided with the Policy Injection Application Block (see Table 13-1), this rule has nothing to do with the member that is being targeted. Instead, it determines if the handlers specified will be processed based on the time of day. This can be helpful, for example, if caching should be applied to a class s member during only peak times of the day. To configure a matching rule, you can use the more generic name-value pair method via the CustomMatchingRuleData class, or you can define your own design-time components to support the configuration of your custom matching rules. While the latter may provide a prettier user interface, using the CustomMatchingRuleData class is much simpler to implement you just need to decorate your matching rule class with the ConfigurationElementType attribute, as shown in Listing 13-3.