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No matter how you implement logging, it will always have some performance impact. The Logging block provides a flexible and highly configurable logging solution that is carefully designed to minimize performance impact. However, you should be aware of this impact, and consider how your own logging strategy will affect it. For example, a complex configuration that writes log entries to multiple logs and uses multiple filters is likely to have more impact than simple configurations. You must balance your requirements for logging against performance and scalability needs. To maximize performance, the LogWriter class by default exposes properties only for the commonly required information. This includes the event ID, message, priority, and categories you specify in the configuration. The LogWriter also automatically collects some context information such as the time, the application domain, the machine name, and the process ID where possible using cached values in order to minimize performance impact. However, collecting additional context information can be expensive in processing terms and, if you are not going to use the information, wastes precious resources and may affect performance. Therefore, the Logging block only collects other less commonly used information from the environment, which you might require only occasionally, if you specify that you want this information when you create the LogEntry instance. Four classes within the Logging block can collect specific sets of context information that you can add to your log entry. This includes COM+ diagnostic information, the current stack trace, the security-related information from the managed runtime, and security-related information from the operating system. There is also a dictionary property for the log entry where you can add any additional custom information you require, and which must appear in your logs.
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It s time to see some examples of the Logging block use, including how to create log entries and write them to various targets such as the Windows Event Log, disk files, and a database. Later you ll see how you can use some of the advanced features of the block, such as checking filter status and adding context information to a log entry. However, before you can start using the Logging block, you must configure it. You can configure the Logging block using the configuration tool described in 1, Introduction. The logging settings section of the configuration tool contains three columns where you configure filters (trace sources), logging target listeners (trace listeners), and log message formatters. The first column contains three types of filter: categories (category sources), special categories, and logging filters. All of these items were described in the schematic shown in Figure 1 and the accompanying table. Figure 2 shows the configuration tool loaded with the configuration for the examples used in this chapter. You can see that we have configured several types of filters, listeners, and formatters. As the configuration contains the Database trace listener, the configuration tool has automatically added the Database Settings section as well.
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figure 2 The configuration settings for the sample application
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The easiest way to learn about how the Logging block configuration works is to run the configuration tool yourself and open the App.config file from the example application. You can expand each of the sections to see the property settings, and to relate each item to the others. Now you must edit your code to use the Logging block. You ll need to add references to the appropriate Enterprise Library assemblies and namespaces. The assemblies you must add to your project (in addition to the assemblies required for all Enterprise Library projects) are: Microsoft.Practices.EnterpriseLibrary.Logging.dll Microsoft.Practices.EnterpriseLibrary.Logging.Database.dll Microsoft.Practices.EnterpriseLibrary.Data.dll However, if you do not intend to send log entries to a database, you will not require the last two assemblies on this list. Now you are ready to write some code.
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