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Although Boost and Varnish are different kinds of caching solutions, Drupal administrators often weigh these two options directly against each other. In general Boost is easier to set up and administer than Varnish. However, Varnish offers a general solution to better performance as it can be used to proxy cache other kinds of content, such as static images and style sheets, and not just Drupal pages. Varnish also offers the ability to load balance and rewrite requests before they even reach your web server, whereas Boost requests are still hitting the web server. However, it s also possible to use Boost and Varnish together. You may just need to tune your HTTP cache expiration headers and Boost cache purging so that Varnish and Boost are refreshing their caches in a timely manner.

Figure 6-5. The PTSalesPerson class PTSalesPerson is a class representing, of course, a part-time salesperson. For the sake of argument, let s say that you wish to ensure that no other developer is able to subclass from PTSalesPerson. (After all, how much more part-time can you get than part-time ) Again, to prevent others from extending a class, make use of the sealed keyword: sealed class PTSalesPerson : SalesPerson { public PTSalesPerson(string fullName, int age, int empID, float currPay, string ssn, int numbOfSales) :base (fullName, age, empID, currPay, ssn, numbOfSales) { } // Assume other members here... }

Given that sealed classes cannot be extended, you may wonder if it is possible to reuse the functionality found within a class marked sealed Glad you asked! If you wish to build a new class that leverages the functionality of a sealed class, your one option is to make use of the containment/delegation model (aka the has-a relationship).

Tuning Linux to handle high volumes of web traffic deserves a book unto itself. There are, however, simple changes that will help improve the performance of high traffic sites, such as those outlined in the sysctl_set.sh script here (courtesy of Audun Ytterdal, http://www.varnish-cache.org/lists/pipermail/ varnish-misc/2008-April/001763.html). #!/bin/sh # Tweaks (see http://varnish-cache.org/wiki/Performance) echo " net.ipv4.ip_local_port_range = 1024 65536 net.ipv4.tcp_rmem=4096 87380 16777216 net.ipv4.tcp_wmem=4096 65536 16777216 net.ipv4.tcp_fin_timeout = 3 net.ipv4.tcp_no_metrics_save=1 net.ipv4.tcp_syncookies = 0 net.ipv4.tcp_max_orphans = 262144 net.ipv4.tcp_max_syn_backlog = 262144 net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_syn_retries = 2 net.core.rmem_max=16777216

Recall that code reuse comes in two flavors. You have just explored the classical is-a relationship. Before you examine the third pillar of OOP (polymorphism), let s examine the has-a relationship (also known as the containment/delegation model or aggregation). Assume you have created a new class that models an employee benefits package: // This new type will function as a contained class. class BenefitPackage { // Assume we have other members that represent // dental/health benefits, and so on. public double ComputePayDeduction() { return 125.0; } } Obviously, it would be rather odd to establish an is-a relationship between the BenefitPackage class and the employee types. (Employee is-a BenefitPackage I don t think so.) However, it should be clear that some sort of relationship between the two could be established. In short, you would like to express the idea that each employee has-a BenefitPackage. To do so, you can update the Employee class definition as follows: // Employees now have benefits. partial class Employee { // Contain a BenefitPackage object. protected BenefitPackage empBenefits = new BenefitPackage(); ... } At this point, you have successfully contained another object. However, to expose the functionality of the contained object to the outside world requires delegation. Delegation is simply the act of adding public members to the containing class that make use of the contained object s functionality. For example, you could update the Employee class to expose the contained empBenefits object using a custom property as well as make use of its functionality internally using a new method named GetBenefitCost(): public partial class Employee { // Contain a BenefitPackage object. protected BenefitPackage empBenefits = new BenefitPackage(); // Expose certain benefit behaviors of object. public double GetBenefitCost()