Enterprise Library Test Guide - Willy .Net

Testing for Performance and Scalability 185
it reaches the maximum number of elements in the cache. (This number varied from
900 to 2,000.) When the maximum number was reached, the test resets the count and
begins again.
To generate keys, you can either modify the test script or use data binding.
Modifying the Test Script to Generate Keys
You can modify the test script to include code that generates a unique key value for
each cache item. In this approach, a static integer named KeyValue stores the key
value. The maximum value that can be generated is controlled by another variable
named MaxElements. If the key is higher than MaxElements, it is reset to 1. Because
the script runs in multithreaded scenarios, the code locks the steps that generate the
keys. This is shown in the following example.
private static int KeyValue=0;
private static object lockn = new object();
private const int MaxElements=2000
String KeyValueString;
lock (lockn)
{
KeyValueString = KeyValue.ToString();
KeyValue++;
if (KeyValue > MaxElements)
KeyValue = 1;
}
For more information, see Using the Test Script.
Using Data Binding to Generate Keys
Data binding allows you to use either a database or a .csv file to serve as the data
source for the keys. The first row of the table or file should contain the name of the
items that will go into the cache. For example, “Key” would be an appropriate name.
The other rows contain the values for the keys. For more information, see Using Data
Binding.
Creating the Test Code
The test code implements the scenarios. There are two versions of the test code
shown here. One version is for Enterprise Library and the other version is for ASP.
NET. Only the Add and Read scenarios were used to establish a baseline, so the .NET
Framework code implements only those two cases. During the baseline tests, the
Enterprise Library tests were performed both with and without scavenging. The code
for Enterprise Library 1.1 differs from the code for Enterprise Library–January 2006,
but it is not shown here.
Table 3 lists the Caching Application Block test code.