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Listing 5-17. XmlBuilderHelper.cs internal static class XmlBuilderHelper { public static NodeBuilder CreateNodeBuilder(ChildNodesBuilder parent, string name, object[] args) { XmlBodyAttributes bodyAttributes = ParseArgs(args); return new NodeBuilder(parent, name, bodyAttributes.TagBody, bodyAttributes.Attributes); } public static XmlBodyAttributes ParseArgs(object[] args) { String newTagBody = null; int attrLength = args.Length; if ((args.Length % 2) == 1) //the element has only body { newTagBody = args[args.Length - 1].ToString(); --attrLength; } Dictionary<object, object> attributes = (attrLength > 0) new Dictionary<object, object>() : null; for (int i = 0; i < attrLength; i++) attributes.Add(args[i], args[++i]); return new XmlBodyAttributes(newTagBody, attributes); } } internal class XmlBodyAttributes { public String TagBody; public Dictionary<object, object> Attributes; public XmlBodyAttributes(String tagBody, Dictionary<object, object> attributes) { this.TagBody = tagBody; this.Attributes = attributes; } }

Once the database is prepared for polling, you must also configure the application to make use of it. The configuration block shown in Listing 6-27 belongs within the system.web block and creates a mapping to the AdventureWorks database, which is designated with the aw values as the connection string name as well as the name of the cache dependency. Listing 6-27. Configuration SqlCacheDependency <caching> <sqlCacheDependency enabled="true"> <databases> <add name="aw" connectionStringName="aw" pollTime="15000"/> </databases> </sqlCacheDependency> </caching> The pollTime attribute is optional. It controls how often the status table is checked. This value is in milliseconds, but I would highly discourage the value ever dropping below one second (1,000 ms). In fact, I would make the poll time much higher, such as ten seconds or a full minute. And if you are using absolute expiration, you would naturally want the poll time to be much shorter than the caching window, while a sliding window may never invalidate cached items unless polling indicates to the cache that a dependency has changed. Now that polling is enabled and configured, the code snippet in Listing 6-28 will create a polling cache dependency and insert the item into the cache. Listing 6-28. Creating a Polling Cache Dependency Cache cache = HttpRuntime.Cache; CacheDependency cacheDependency = new SqlCacheDependency("aw", "Production.Product"); cache.Insert(cacheKey, dataSet, cacheDependency,

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DateTime.Now.AddSeconds(120), Cache.NoSlidingExpiration, CacheItemPriority.Normal, removedCallback); Notice the aw parameter references the configured cache dependency, and the table fully qualifies the Production.Product table. The cached item is given an absolute time-out of 120 seconds, while the cache dependency will poll the status table for changes every 15 seconds. If the data changes immediately after the query pulls the data, it will not get a change until at least 15 seconds later.

This chapter focused on the IDynamicMetaObjectProvider interface and the DynamicMetaObject class. If a class implements the IDynamicMetaObjectProvider interface, then instances of the class will have associated meta-objects. Those meta-objects will be instances of DynamicMetaObject or its derivatives. If those meta-objects are instances of a class that derives from DynamicMetaObject, they can have late binding behaviors that are different from the default late-binding behaviors implemented in

While polling is a simple and reliable way to invalidate data held in the cache, it can be a bit resource intensive if the poll time is very low. And because the poll time is configured for the entire database and not unique for each monitored table, it is likely you will set the poll time to the lowest number necessary for the table that needs to remain the most current. A shorter poll time means the database will be hit more often. Polling is also not a fine-grained approach. The cache dependency will change for any insert, update, or delete in the monitored table regardless of whether the modified data is actually held in the cache. If you have a table with 50,000 rows and 10,000 of those rows are currently held in the cache, an update to a single record will cause all of those 10,000 rows to be removed from the cache.

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