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The design of Memcached illustrates an important principle that is used in several other kinds of databases, and which you might want to employ in architectures of your own: the clients shard the database by hashing the keys string values and letting the hash determine which member of the cluster is consulted for each key To understand why this is effective, consider a particular key/value pair like the key sq:42 and the value 1764 that might be stored by Listing 8 1 To make the best use of the RAM it has available, the Memcached cluster wants to store this key and value exactly once But to make the service fast, it wants to avoid duplication without requiring any coordination between the different servers or communication between all of the clients.

The test harness is bare bones and nothing fancy. It has a text box at the top, a Run button, and an option box labeled Show errors here . Before we dig into the details, let s make something happen. Below the text twitter = new TwitterClass() type twitter. getLatestPosts(). Click the Run button, and after a few moments, content should appear below the text box, as shown in Figure 8-19.

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Essentially, a method is a block of code with a name. You can execute the code by using the method s name. You can pass data into a method and receive data as output. As you saw in the previous chapter, a method is a function member of a class. Methods have two major sections, as shown in Figure 5-1 the method header and the method body: The method header specifies the method s characteristics, including the following: Whether the method returns data The name of the method What types of input can be passed to the method The method body contains the sequence of executable code statements. Execution starts at the first statement in the method body and continues sequentially through the method.

This means that all of the clients, without any other information to go on than (a) the key and (b) the list of Memcached servers with which they are configured, need some scheme for working out where that piece of information belongs If they fail to make the same decision, then not only might the key and value be copied on to several servers and reduce the overall memory available, but also a client s attempt to remove an invalid entry could leave other invalid copies elsewhere The solution is that the clients all implement a single, stable algorithm that can turn a key into an integer n that selects one of the servers from their list They do this by using a hash algorithm, which mixes the bits of a string when forming a number so that any pattern in the string is, hopefully, obliterated.

Figure 5-1. The structure of a method The following example shows the form of the method header. I will cover each part in the following pages. int MyMethod ( int intpar1, string strpar1 ) Return Method Parameter type name list

To see why patterns in key values must be obliterated, consider Listing 8 2 It loads a dictionary of English words (you might have to download a dictionary of your own or adjust the path to make the script run on your own machine), and explores how those words would be distributed across four servers if they were used as keys The first algorithm tries to divide the alphabet into four roughly equal sections and distributes the keys using their first letter; the other two algorithms use hash functions Listing 8 2 Two Schemes for Assigning Data to Servers #!/usr/bin/env python # Foundations of Python Network Programming - 8 - hashingpy # Hashes are a great way to divide work import hashlib.

Methods can also be function members of another user-defined type called a struct, which is covered in 12. Most of what this chapter covers about class methods will also be true for struct methods. For example, the following code shows a simple method called MyMethod, that, in turn, calls the WriteLine method several times: void MyMethod() { Console.WriteLine("First"); Console.WriteLine("Last"); }

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