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on. When an item bound to a custom dependency object is added to the Cache, an additional entry is created and linked to the initial item. NotifyDependencyChanged simply invalidates this additional element which, in turn, invalidates the original cache item.

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The following source code shows the core implementation of the custom XmlDataCacheDependency class:

public class XmlDataCacheDependency : CacheDependency { // Internal members static Timer _timer; Int32 _pollSecs = 10; String _fileName; String _xpathExpression; String _currentValue; public XmlDataCacheDependency(String file, String xpath, Int32 pollTime) { // Set internal members _fileName = file; _xpathExpression = xpath; _pollSecs = pollTime; // Get the current value _currentValue = CheckFile();

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// Set the timer if (_timer == null) { var ms = _pollSecs * 1000; var cb = new TimerCallback(XmlDataCallback); _timer = new Timer(cb, this, ms, ms); } } public String CurrentValue { get { return _currentValue; } } public void XmlDataCallback(Object sender) { // Get a reference to THIS dependency object var dep = sender as XmlDataCacheDependency;

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// Check for changes and notify the base class if any are found var value = CheckFile(); if (!String.Equals(_currentValue, value)) dep.NotifyDependencyChanged(dep, EventArgs.Empty); } public String CheckFile() { // Evaluates the XPath expression in the file var doc = new XmlDocument(); doc.Load(_fileName); var node = doc.SelectSingleNode(_xpathExpression); return node.InnerText; } protected override void DependencyDispose() { // Kill the timer and then proceed as usual _timer.Dispose(); _timer = null; base.DependencyDispose(); } }

When the cache dependency is created, the file is parsed and the value of the XPath expression is stored in an internal member. At the same time, a timer is started to repeat the operation at regular intervals. The return value is compared to the value stored in the constructor code. If the two are different, the NotifyDependencyChanged method is invoked on the base CacheDependency class to invalidate the linked content in the ASP.NET Cache.

How can you use this dependency class in a Web application It s as easy as it seems you just use it in any scenario where a CacheDependency object is acceptable. For example, you create an instance of the class in the Page_Load event and pass it to the Cache.Insert method:

In the data warehouse, the key attribute in a dimension table must contain a unique value for each member of the dimension . In relational database terms, this key attribute is called a primary key column . Each dimension key column in a fact table corresponds to the primary key column of one of the dimension tables . Each key value that appears once in the dimension table may appear multiple times in the fact table . For example, the Product Key 483, for Hitch Rack, should appear in only one dimension table row, but it may appear in many fact table rows . This is called a one-to-many relationship . In the fact table, a dimension key column (which is on the many side of the one-to-many relationship) is called a foreign key column . The relational database uses the matching values from the primary key column (in the dimension table) and the foreign key column (in the fact table) to join the records in a fact table to the corresponding records in the dimension table . The dimension table will typically have additional columns that contain the members of the other attributes in the dimension . Table 1-17 shows the product dimension table with Product, Subcategory, Category, Color, Size, and List Price attributes .

protected const String CacheKeyName = "MyData"; protected void Page_Load(Object sender, EventArgs e) { if (!IsPostBack) { // Create a new entry with a custom dependency (and poll every 10 seconds) var dependency = new XmlDataCacheDependency( Server.MapPath("employees.xml"), "MyDataSet/NorthwindEmployees/Employee[employeeid=3]/lastname", 10); Cache.Insert(CacheKeyName, dependency.CurrentValue, dependency); } // Refresh the UI Msg.Text = Display(); }

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