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{ return empBenefits.ComputePayDeduction(); } // Expose object through a custom property. public BenefitPackage Benefits { get { return empBenefits; } set { empBenefits = value; } } ... } In the following updated Main() method, notice how you can interact with the internal BenefitsPackage type defined by the Employee type: static void Main(string[] args) { Console.WriteLine("***** The Employee Class Hierarchy *****\n"); Manager chucky = new Manager("Chucky", 50, 92, 100000, "333-23-2322", 9000); double cost = chucky.GetBenefitCost(); Console.ReadLine(); }

net.core.wmem_max=16777216 net.core.netdev_max_backlog = 30000 net.core.somaxconn = 262144 " > sysctl_tweaks.conf sysctl -p sysctl_tweaks.conf The description of the variables listed above is as follows: ip_local_port_range: Maximize the range of network ports available for establishing network connections tcp_rmem and tcp_wmem, rmem_max and wmem_max: Increase the size of network I/O buffers tcp_fin_timeout: Decrease the time to close lingering network connections tcp_max_orphans: Increase number of sockets held by the system that are not attached to something yet tcp_max_syn_backlog: Increase number of SYN handshakes to keep in memory (requires tcp_syncookies=1) tcp_synack_retries: Decrease the number of attempts to establish a TCP connection netdev_max_backlog: Increase maximum number of incoming packets that can be queued up for upper-layer processing somaxconn: The size of the listen queue for accepting new TCP connections

The previous chapter briefly mentioned the concept of nested types, which is a spin on the has-a relationship you have just examined. In C# (as well as other .NET languages), it is possible to define a type (enum, class, interface, struct, or delegate) directly within the scope of a class or structure. When you have done so, the nested (or inner ) type is considered a member of the nesting (or outer ) class, and in the eyes of the runtime can be manipulated like any other member (fields, properties, methods, and events). The syntax used to nest a type is quite straightforward: public class OuterClass { // A public nested type can be used by anybody. public class PublicInnerClass {} // A private nested type can only be used by members // of the containing class. private class PrivateInnerClass {} } Although the syntax is clean, understanding why you might want to do this may not readily apparent. To understand this technique, ponder the following traits of nesting a type: Nested types allow you to gain complete control over the access level of the inner type, as they may be declared privately (recall that non-nested classes cannot be declared using the private keyword). Because a nested type is a member of the containing class, it can access private members of the containing class.

Oftentimes, a nested type is only useful as a helper for the outer class, and is not intended for use by the outside world.

Slow file systems are the tar pits of LAMP stacks. Every layer of the LAMP is touching the file system very frequently. Storing your database on a slow file system will certainly cause poor performance. Examples of fast file systems include: ramfs or tmpfs (uses memory as disk space) ext2 on a local disk ext3 on a local disk XFS on a local disk hardware raid SAN or NAS using dedicated hardware

When a type nests another class type, it can create member variables of the type, just as it would for any point of data. However, if you wish to make use of a nested type from outside of the containing type, you must qualify it by the scope of the nesting type. Consider the following code: static void Main(string[] args) { // Create and use the public inner class. OK! OuterClass.PublicInnerClass inner; inner = new OuterClass.PublicInnerClass(); // Compiler Error! Cannot access the private class. OuterClass.PrivateInnerClass inner2; inner2 = new OuterClass.PrivateInnerClass(); } To make use of this concept within the employees example, assume you have now nested the BenefitPackage directly within the Employee class type: partial class Employee { public class BenefitPackage { // Assume we have other members that represent // dental/health benefits, and so on. public double ComputePayDeduction() { return 125.0; } } ... } The nesting process can be as deep as you require. For example, assume you wish to create an enumeration named BenefitPackageLevel, which documents the various benefit levels an employee may choose. To programmatically enforce the tight connection between Employee, BenefitPackage, and BenefitPackageLevel, you could nest the enumeration as follows: // Employee nests BenefitPackage. public partial class Employee { // BenefitPackage nests BenefitPackageLevel. public class BenefitPackage { public enum BenefitPackageLevel { Standard, Gold, Platinum } public double ComputePayDeduction() {