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Your goal is to create a family of classes that model various types of employees in a company. Assume that you wish to leverage the functionality of the Employee class to create two new classes (SalesPerson and Manager). The class hierarchy you will be building initially over the next several pages looks something like what you see in Figure 6-4 (be aware that you will not see individual fields in your diagram if you make use of C# automatic property syntax).

The key to achieving good Varnish cache hits rates is to normalize the incoming HTTP requests so that all anonymous requests for the same URL get the same cache hit from Varnish. To understand Varnish cache coherency you must first understand how Varnish stores cache entries for each URL. Varnish combines the following incoming request attributes into a hash key which it uses to store and lookup its cache entries: request URL incoming Host header incoming Cookie header incoming Accept-Encoding header The issue here is that the Cookie header and the Accept-Encoding header vary from browser to browser. For example, it is highly likely that the variety of browsers hitting your web site have different cookies and thus different Cookie headers. To address the variance of incoming Cookie headers you'll want to (at best) remove the entire incoming Cookie header during the vcl_recv phase of your Varnish config, like so: sub vcl_recv { # Remove the incoming Cookie header from anonymous requests if (req.http.Cookie !~ "(^|;\s*)SESS") { unset req.http.Cookie; } # ... other vcl_recv rules here ... # Don't serve cached content to logged-in users if(req.http.cookie ~ "SESS") { return(pass); }

Figure 6-4. The initial Employees hierarchy As illustrated in Figure 6-4, you can see that a SalesPerson is-a Employee (as is a Manager). Remember that under the classical inheritance model, base classes (such as Employee) are used to define general characteristics that are common to all descendents. Subclasses (such as SalesPerson and Manager) extend this general functionality while adding more specific functionality. For your example, you will assume that the Manager class extends Employee by recording the number of stock options, while the SalesPerson class maintains the number of sales made. Insert a new class file (Manager.cs) that defines the Manager class with the following automatic property: // Managers need to know their number of stock options. class Manager : Employee { public int StockOptions { get; set; } } Next, add another new class file (SalesPerson.cs) that defines the SalesPerson class with a fitting automatic property: // Salespeople need to know their number of sales. class SalesPerson : Employee {

public int SalesNumber { get; set; } } Now that you have established an is-a relationship, SalesPerson and Manager have automatically inherited all public members of the Employee base class. To illustrate, update your Main() method as follows: // Create a subclass object and access base class functionality. static void Main(string[] args) { Console.WriteLine("***** The Employee Class Hierarchy *****\n"); SalesPerson danny = new SalesPerson(); danny.Age = 31; danny.Name = "Danny"; danny.SalesNumber = 50; Console.ReadLine(); }

# Attempt to serve from cache return(lookup); } The above VCL snippet checks if the request is from a logged-in user (one that has a cookie starting with "SESS") and if it not then normalizes the Cookie header by removing it altogether. If there is a need to have some cookies from anonymous request echoed to your backend servers then you can adjust the Cookie regex or add a few more lines to be more selective about which cookies ought to miss the Varnish cache lookup pahse. The other incoming request header that needs to be normalized is Accept-Encoding because it varies slightly across different web browser types. The most common use of the Accept-Encoding header if for the web browser to communicate to the web server that the browser can receive compressed content. The typical VCL snippet to normalize the Accept-Encoding looks like this: # Normalize Accept-Encoding to get better cache coherency if (req.http.Accept-Encoding) { # No point in compressing media that is already compressed if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") { remove req.http.Accept-Encoding; # MSIE 6 JS bug workaround } elsif(req.http.User-Agent ~ "MSIE 6") { unset req.http.Accept-Encoding; } elsif (req.http.Accept-Encoding ~ "gzip") { set req.http.Accept-Encoding = "gzip"; } elsif (req.http.Accept-Encoding ~ "deflate") { set req.http.Accept-Encoding = "deflate"; } else { # unkown algorithm remove req.http.Accept-Encoding; } }